Adding upstream version 3.10.8.

Signed-off-by: Daniel Baumann <daniel@debian.org>
2025-05-18 09:37:23 +02:00 · 2025-05-18 09:37:23 +02:00 · 03bfe4079e
commit 03bfe4079e
parent 37e9b6d587
356 changed files with 28857 additions and 0 deletions
--- a/.deadcode-out
+++ b/.deadcode-out
@ -0,0 +1,84 @@
+code.forgejo.org/f3/gof3/v3/api
+	TreeMirror
+
+code.forgejo.org/f3/gof3/v3/f3
+	RepositoryDirname
+
+code.forgejo.org/f3/gof3/v3/forges/forgejo
+	common.isContainer
+
+code.forgejo.org/f3/gof3/v3/forges/forgejo/sdk
+	hasAgent
+	GetAgent
+	Version
+	NewClientWithHTTP
+	UseSSHCert
+	UseSSHPubkey
+	SetOTP
+	SetContext
+	SetSudo
+	SetUserAgent
+	SetDebugMode
+	OptionalBool
+	OptionalString
+	OptionalInt64
+	VerifyWebhookSignature
+	VerifyWebhookSignatureMiddleware
+	NewHTTPSignWithPubkey
+	NewHTTPSignWithCert
+	newHTTPSign
+	findCertSigner
+	findPubkeySigner
+	SetGiteaVersion
+
+code.forgejo.org/f3/gof3/v3/forges/gitlab
+	common.getTree
+	common.getF3Tree
+	common.getChildDriver
+	common.isContainer
+	common.getURL
+	common.getPushURL
+	common.getNewMigrationHTTPClient
+	common.getIsAdmin
+	common.getVersion
+	treeDriver.maybeSudo
+
+code.forgejo.org/f3/gof3/v3/forges/helpers/tests/repository
+	TestHelper.GetNode
+	TestHelper.RevList
+	TestHelper.AssertRepositoryNotFileExists
+	TestHelper.BranchRepositoryFeature
+
+code.forgejo.org/f3/gof3/v3/internal/hoverfly
+	MainTest
+	GetSingleton
+	testSimulate.Run
+
+code.forgejo.org/f3/gof3/v3/options/cli
+	OptionsCLI.FromFlags
+	OptionsCLI.GetFlags
+
+code.forgejo.org/f3/gof3/v3/tree/f3
+	NewLabelReference
+	NewPullRequestLabelReference
+	NewMilestoneReference
+	pullRequestNode.GetPullRequestHead
+	pullRequestNode.GetPullRequestRef
+	pullRequestNode.GetPullRequestPushRefs
+	newPullRequestNode
+	NewRepositoryPath
+	NewTopicPath
+	NewTopicPathString
+	NewTopicReference
+
+code.forgejo.org/f3/gof3/v3/tree/f3/objects
+	FuncReadURLAndSetSHA
+
+code.forgejo.org/f3/gof3/v3/tree/generic
+	MirrorOptions.SetNoRemap
+	TreePartialMirror
+
+code.forgejo.org/f3/gof3/v3/tree/tests/f3
+	Creator.GetDirectory
+	Creator.Generate
+
--- a/.editorconfig
+++ b/.editorconfig
@ -0,0 +1,10 @@
+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+tab_width = 2
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
--- a/.forgejo/workflows/release.yml
+++ b/.forgejo/workflows/release.yml
@ -0,0 +1,35 @@
+on:
+  push:
+    tags: 'v*'
+
+jobs:
+  publish:
+    runs-on: docker-bookworm
+    container:
+      image: 'data.forgejo.org/oci/ci:1'
+    steps:
+      - uses: https://data.forgejo.org/actions/checkout@v4
+
+      - uses: https://data.forgejo.org/actions/setup-go@v5
+        with:
+          go-version-file: "go.mod"
+
+      - run: |
+         make f3-cli
+         mkdir release
+         mv f3-cli release/
+
+      - name: publish release
+        uses: https://data.forgejo.org/actions/forgejo-release@v2.6.0
+        with:
+          url: "https://code.forgejo.org"
+          repo: "f3/gof3"
+          direction: upload
+          tag: "${{ github.ref_name }}"
+          sha: "${{ github.sha }}"
+          release-dir: release
+          token: ${{ secrets.RELEASE_NOTES_ASSISTANT_TOKEN }}
+          override: true
+          verbose: ${{ vars.VERBOSE || "false" }}
+          release-notes-assistant: true
+          hide-archive-link: true
--- a/.forgejo/workflows/test-gitea.yml
+++ b/.forgejo/workflows/test-gitea.yml
@ -0,0 +1,38 @@
+#
+# secrets.F3_READ_PRIVATE_MIRRORS_TOKEN
+#   https://code.forgejo.org/forgejo-mirror scope read:repository
+#
+on:
+  pull_request_target:
+  push:
+    branches:
+      - 'main'
+      - 'wip-gitea'
+
+jobs:
+  compliance-gitea:
+    runs-on: lxc-bookworm
+    steps:
+      - uses: https://data.forgejo.org/actions/checkout@v4
+        with:
+          submodules: true
+      - uses: https://data.forgejo.org/actions/setup-go@v5
+        with:
+          go-version-file: "go.mod"
+
+      - name: install jq make
+        run: |
+          export DEBIAN_FRONTEND=noninteractive
+          apt-get -q install -qq -y jq make
+
+      - run: make deps-backend lint
+
+      - name: install zstd for actions/cache@v4
+        run: |
+          export DEBIAN_FRONTEND=noninteractive
+          apt-get -q install -y -qq zstd
+
+      - name: run tests
+        run: |
+          ./tests/run.sh prepare_container
+          su forgejo -c "./tests/run.sh test_gitea ${{ secrets.F3_READ_PRIVATE_MIRRORS_TOKEN }}"
--- a/.forgejo/workflows/test.yml
+++ b/.forgejo/workflows/test.yml
@ -0,0 +1,54 @@
+on:
+  pull_request:
+  push:
+    branches:
+      - 'main'
+
+jobs:
+  compliance:
+    runs-on: lxc-bookworm
+    steps:
+      - uses: https://data.forgejo.org/actions/checkout@v4
+        with:
+          submodules: true
+      - uses: https://data.forgejo.org/actions/setup-go@v5
+        with:
+          go-version-file: "go.mod"
+
+      - name: install jq make
+        run: |
+          export DEBIAN_FRONTEND=noninteractive
+          apt-get -q install -qq -y jq make
+
+      - run: make deps-backend lint
+
+      - name: install hoverfly
+        run: |
+          export DEBIAN_FRONTEND=noninteractive
+          apt-get -q install -qq -y unzip wget
+          version=$(./tests/run.sh hoverfly_version)
+          wget https://github.com/SpectoLabs/hoverfly/releases/download/v$version/hoverfly_bundle_linux_amd64.zip
+          unzip hoverfly_bundle_linux_amd64.zip
+          mv hoverfly hoverctl /usr/local/bin
+
+      - name: install zstd for actions/cache@v4
+        run: |
+          export DEBIAN_FRONTEND=noninteractive
+          apt-get -q install -y -qq zstd
+
+      - name: get GitLab version
+        id: gitlab
+        run: |
+          echo "version=$(./tests/run.sh gitlab_version)" >> "$GITHUB_OUTPUT"
+
+      - name: cache GitLab OCI image
+        uses: https://data.forgejo.org/actions/cache@v4
+        with:
+          path: |
+            /srv/forgejo-binaries/gitlab
+          key: gitlab-${{ steps.gitlab.outputs.version }}
+
+      - name: run tests
+        run: |
+          ./tests/run.sh prepare_container
+          su forgejo -c "./tests/run.sh run"
--- a/.gitignore
+++ b/.gitignore
@ -0,0 +1,7 @@
+*~
+f3-cli
+coverage.out
+coverage.html
+tests/*.out
+format/schemas/.gitignore
+.cur-deadcode-out
--- a/.gitmodules
+++ b/.gitmodules
@ -0,0 +1,6 @@
+[submodule "tests/setup-forgejo"]
+	path = tests/setup-forgejo
+	url = https://code.forgejo.org/actions/setup-forgejo
+[submodule "tests/end-to-end"]
+	path = tests/end-to-end
+	url = https://code.forgejo.org/forgejo/end-to-end
--- a/.golangci.yml
+++ b/.golangci.yml
@ -0,0 +1,81 @@
+#
+# Copied from https://github.com/go-gitea/gitea/blob/cc649f0cb338a085373fd85a8b71e315701cbdc1/.golangci.yml
+#
+linters:
+  enable:
+    - gosimple
+    - typecheck
+    - govet
+    - errcheck
+    - staticcheck
+    #- unused # disabled because it gets it wrong with golangci-lint@v1.51.2 run & go 1.20.3
+    - gofmt
+    - misspell
+    - gocritic
+    - bidichk
+    - ineffassign
+    - revive
+    - gofumpt
+    - depguard
+    - nakedret
+    - unconvert
+    - wastedassign
+    - nolintlint
+    - stylecheck
+  enable-all: false
+  disable-all: true
+  fast: false
+
+run:
+  go: 1.22
+  timeout: 10m
+
+issues:
+  exclude-dirs:
+    - forges/forgejo/sdk
+
+linters-settings:
+  stylecheck:
+    checks: ["all", "-ST1005", "-ST1003"]
+  nakedret:
+    max-func-lines: 0
+  gocritic:
+    disabled-checks:
+      - ifElseChain
+      - singleCaseSwitch # Every time this occurred in the code, there  was no other way.
+  revive:
+    ignore-generated-header: false
+    severity: warning
+    confidence: 0.8
+    errorCode: 1
+    warningCode: 1
+    rules:
+      - name: blank-imports
+      - name: context-as-argument
+      - name: context-keys-type
+      - name: dot-imports
+      - name: error-return
+      - name: error-strings
+      - name: error-naming
+      - name: if-return
+      - name: increment-decrement
+      - name: var-naming
+      - name: var-declaration
+      - name: package-comments
+      - name: range
+      - name: receiver-naming
+      - name: time-naming
+      - name: unexported-return
+      - name: indent-error-flow
+      - name: errorf
+      - name: duplicated-imports
+      - name: modifies-value-receiver
+  depguard:
+    #list-type: denylist
+    # Check the list against standard lib.
+    #include-go-root: true
+    rules:
+      main:
+        deny:
+          - pkg: io/ioutil
+            desc: use os or io instead
--- a/20
+++ b/20
@ -0,0 +1,20 @@
+Copyright Earl Warren <contact@earl-warren.org>
+Copyright Loïc Dachary <loic@dachary.org>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
--- a/75
+++ b/75
@ -0,0 +1,75 @@
+GO ?= $(shell go env GOROOT)/bin/go
+
+DIFF ?= diff --unified
+
+EDITORCONFIG_CHECKER_PACKAGE ?= github.com/editorconfig-checker/editorconfig-checker/v2/cmd/editorconfig-checker@2.8.0 # renovate: datasource=go
+GOFUMPT_PACKAGE ?= mvdan.cc/gofumpt@v0.7.0 # renovate: datasource=go
+GOLANGCI_LINT_PACKAGE ?= github.com/golangci/golangci-lint/cmd/golangci-lint@v1.62.2 # renovate: datasource=go
+UNCOVER_PACKAGE ?= github.com/gregoryv/uncover/cmd/uncover@latest
+MISSPELL_PACKAGE ?= github.com/golangci/misspell/cmd/misspell@v0.6.0 # renovate: datasource=go
+DEADCODE_PACKAGE ?= golang.org/x/tools/cmd/deadcode@v0.24.0 # renovate: datasource=go
+GOMOCK_PACKAGE ?= go.uber.org/mock/mockgen@v0.5.0 # renovate: datasource=go
+
+SCHEMAS_VERSION ?= v3
+
+DEADCODE_ARGS ?= -generated=false -test -f='{{println .Path}}{{range .Funcs}}{{printf "\t%s\n" .Name}}{{end}}{{println}}' code.forgejo.org/f3/gof3/v3/...
+
+VERSION ?= $(shell git describe --tags --always | sed 's/-/+/' | sed 's/^v//')
+
+LDFLAGS := $(LDFLAGS) -X "code.forgejo.org/f3/gof3/v3/cmd.Version=$(VERSION)"
+
+EXECUTABLE := f3-cli
+
+GO_DIRS = cmd f3 forges logger main options tree util
+GO_SOURCES = $(shell find $(GO_DIRS) -type f -name "*.go")
+
+$(EXECUTABLE): $(GO_SOURCES)
+	$(GO) build -tags 'netgo osusergo' -ldflags '-extldflags -static -s -w $(LDFLAGS)' -o $@ code.forgejo.org/f3/gof3/v3/main
+
+.PHONY: deps-backend
+deps-backend:
+	$(GO) mod download
+	$(GO) install $(GOFUMPT_PACKAGE)
+	$(GO) install $(GOLANGCI_LINT_PACKAGE)
+	$(GO) install $(UNCOVER_PACKAGE)
+	$(GO) install $(MISSPELL_PACKAGE)
+	$(GO) install $(DEADCODE_PACKAGE)
+	$(GO) install $(GOMOCK_PACKAGE)
+
+.PHONY: lint
+lint:
+	@if ! $(MAKE) lint-run ; then echo "Please run 'make lint-fix' and commit the result" ; exit 1 ; fi
+
+.PHONY: lint-run
+lint-run: lint-schemas
+	$(GO) run $(GOLANGCI_LINT_PACKAGE) run $(GOLANGCI_LINT_ARGS)
+	$(GO) run $(DEADCODE_PACKAGE) $(DEADCODE_ARGS) > .cur-deadcode-out
+	$(DIFF) .deadcode-out .cur-deadcode-out
+
+.PHONY: lint-schemas
+lint-schemas:
+	status=0 ; for schema in f3/schemas/*.json ; do if ! jq '.|empty' $$schema ; then status=1 ; echo $$schema error ; fi ; done ; exit $$status
+	d=`mktemp -d` ; trap "rm -fr $$d" EXIT ; git clone --branch $(SCHEMAS_VERSION) --quiet https://code.forgejo.org/f3/f3-schemas $$d/schemas ; diff --exclude '.*' -ru $$d/schemas f3/schemas
+
+.PHONY: lint-schemas-fix
+lint-schemas-fix:
+	d=`mktemp -d` ; trap "rm -fr $$d" EXIT ; git clone --branch $(SCHEMAS_VERSION) --quiet https://code.forgejo.org/f3/f3-schemas $$d/schemas ; cp $$d/schemas/* f3/schemas
+
+.PHONY: lint-fix
+lint-fix: lint-schemas-fix
+	$(GO) run $(GOLANGCI_LINT_PACKAGE) run $(GOLANGCI_LINT_ARGS) --fix
+	$(GO) run $(DEADCODE_PACKAGE) $(DEADCODE_ARGS) > .deadcode-out
+
+.PHONY: fmt
+fmt:
+	GOFUMPT_PACKAGE=$(GOFUMPT_PACKAGE) gofumpt -extra -w .
+
+SPELLCHECK_FILES = $(GO_DIRS)
+
+.PHONY: lint-spell
+lint-spell:
+	@$(GO) run $(MISSPELL_PACKAGE) -error $(SPELLCHECK_FILES)
+
+.PHONY: lint-spell-fix
+lint-spell-fix:
+	@$(GO) run $(MISSPELL_PACKAGE) -w $(SPELLCHECK_FILES)
--- a/README.md
+++ b/README.md
@ -0,0 +1,226 @@
+## gof3
+
+As a CLI or as a library, GoF3 provides a single operation: mirroring. The origin and destination are designated by the URL of a forge and a path to the resource. For instance, `mirror --from-type forgejo --from https://code.forgejo.org/forgejo/lxc-helpers --to-type F3 --to /some/directory` will mirror a project in a local directory using the F3 format.
+
+## Building
+
+* Install go >= v1.21
+* make f3-cli
+* ./f3-cli mirror -h
+
+## Example
+
+### To F3
+
+Login to https://code.forgejo.org and obtain an application token with
+read permissions at https://code.forgejo.org/user/settings/applications.
+
+```sh
+f3-cli mirror \
+  --from-type forgejo --from-forgejo-url https://code.forgejo.org \
+  --from-forgejo-token $codetoken \
+  --from-path /forge/organizations/actions/projects/cascading-pr \
+  --to-type filesystem --to-filesystem-directory /tmp/cascading-pr
+```
+
+### From F3
+
+Run a local Forgejo instance with `serials=1 tests/setup-forgejo.sh` and obtain
+an application token with:
+
+```sh
+docker exec --user 1000 forgejo1 forgejo admin user generate-access-token -u root --raw --scopes 'all,sudo'
+```
+
+Mirror issues
+
+```sh
+f3-cli mirror \
+  --from-type filesystem --from-filesystem-directory /tmp/cascading-pr \
+  --from-path /forge/organizations/actions/projects/cascading-pr/issues \
+  --to-type forgejo --to-forgejo-url http://0.0.0.0:3001 \
+  --to-forgejo-token $localtoken
+```
+
+Visit them at http://0.0.0.0:3001/actions/cascading-pr/issues
+
+## Testing
+
+### Requirements
+
+The tests require a live GitLab instance as well as a live Forgejo instance and will use up to 16GB of RAM.
+
+* Install docker
+* `./test/run.sh`
+
+## License
+
+This project is [MIT licensed](LICENSE).
+
+## Architecture
+
+[F3](https://f3.forgefriends.org/) is a hierarchy designed to be stored in a file system. It is represented in memory with the [tree/generic](tree/generic) abstract data structure that can be saved and loaded from disk by the [forges/filesystem](forges/filesystem) driver. Each forge (e.g. [forges/forgejo](forges/forgejo)) is supported by a driver that is responsible for the interactions of each resource (e.g `issues`, `asset`, etc.).
+
+### Tree
+
+[tree/f3](tree/f3) implements a [F3](https://f3.forgefriends.org/) hierarchy based on the [tree/generic](tree/generic) data structure. The [tree](tree/generic/tree.go) has a [logger](logger) for messages, [options](options) defining which forge it relates to and how and a pointer to the root [node](tree/generic/node.go) of the hierarchy (i.e. the `forge` F3 resource).
+
+The node ([tree/generic/node.go](tree/generic/node.go)) has:
+
+* a unique id (e.g. the numerical id of an `issue`)
+* a parent
+* chidren (e.g. `issues` children are `issues`, `issue` children are `comments` and `reactions`)
+* a kind that maps to a F3 resource (e.g. `issue`, etc.)
+* a driver for its concrete implementation for a given forge
+
+It relies on a forge driver for the concrete implemenation of a F3 resource (issue, reaction, repository, etc.). For instance the `issues` driver for Forgejo is responsible for listing the existing issues and the `issue` driver is responsible for creating, updating or deleting a Forgejo issue.
+
+### F3 archive
+
+The [F3 JSON schemas](https://code.forgejo.org/f3/f3-schemas/-/tree/main) are copied in [f3/schemas](f3/schemas). Their internal representation and validation is found in a source file named after the resource (e.g. an `issue` represented by [f3/schemas/issue.json](f3/schemas/issue.json) is implemented by [f3/issue.go](f3/issue.go)).
+
+When a F3 resource includes data external to the JSON file (i.e. a Git repository or an asset file), the internal representation has a function to copy the data to the destination given in argument. For instance:
+
+* [f3/repository.go](f3/repository.go) `FetchFunc(destination)` will `git fetch --mirror` the repository to the `destination` directory.
+* [f3/releaseasset.go](f3/releaseasset.go) `DownloadFunc()` returns a `io.ReadCloser` that will be used by the caller to copy the asset to its destination.
+
+### Options
+
+The Forge options at [options/interface.go](options/interface.go) define the parameters given when a forge is created:
+
+Each forge driver is responsible for registering the options (e.g. [Forgejo options](forges/forgejo/options/options.go)) and for registering a factory that will create these options (e.g. [Forgejo options registration](forgejo/main.go)). In addition to the options that are shared by all forges such as the logger, it may define additional options.
+
+### Driver interface
+
+For each [F3](https://f3.forgefriends.org/) resource, the driver is responsible for:
+
+* copying the [f3](f3) argument to `FromFormat` to the forge
+* `ToFormat` reads from the forge and convert the data into an [f3/resources.go](f3/resources.go)
+
+A driver must have a unique name (e.g. `forgejo`) and [register](forges/forgejo/main.go):
+
+* an [options factory](options/factory.go)
+* a [forge factory](tree/f3/forge_factory.go)
+
+#### Tree driver
+
+The [tree driver](tree/generic/driver_tree.go) functions (e.g. [forges/forgejo/tree.go](forges/forgejo/tree.go)) specialize [NullTreeDriver](tree/generic/driver_tree.go).
+
+* **Factory(ctx context.Context, kind generic.Kind) generic.NodeDriverInterface** creates a new node driver for a given [`Kind`](tree/f3/kind.go).
+* **GetPageSize() int** returns the default page size.
+
+#### Node driver
+
+The [node driver](tree/generic/driver_node.go) functions for [each `Kind`](tree/f3/kind.go) (e.g. `issues`, `issue`, etc.)  specialize [NullNodeDriver](tree/generic/driver_node.go). The examples are given for the Forgejo [`issue`](forges/forgejo/issue.go) and [`issues`](forges/forgejo/issues.go) drivers, matching the REST API endpoint to the driver function.
+
+* **ListPage(context.Context, page int) ChildrenSlice** returns children of the node paginated  [GET /repos/{owner}/{repo}/issues](https://code.forgejo.org/api/swagger/#/issue/issueListIssues)
+* **Get(context.Context)** get the content of the resource (e.g. [GET /repos/{owner}/{repo}/issues/{index}](https://code.forgejo.org/api/swagger/#/issue/issueGetIssue))
+* **Put(context.Context) NodeID** create a new resource and return the identifier (e.g. [POST /repos/{owner}/{repo}/issues](https://code.forgejo.org/api/swagger/#/issue/issueCreateIssue))
+* **Patch(context.Context)** modify an existing resource (e.g. [PATCH /repos/{owner}/{repo}/issues/{index}](https://code.forgejo.org/api/swagger/#/issue/issueEditIssue))
+* **Delete(context.Context)** delete an existing resource (e.g. [DELETE /repos/{owner}/{repo}/issues/{index}](https://code.forgejo.org/api/swagger/#/issue/issueDelete))
+* **NewFormat() f3.Interface** create a new `issue` F3 object
+* **FromFormat(f3.Interface)** set the internal representation from the given F3 resource
+* **ToFormat() f3.Interface** convert the internal representation into the corresponding F3 resource. For instance the internal representation of an `issue` for the Forgejo driver is the `Issue` struct of the Forgejo SDK.
+
+#### Options
+
+The [options](options) created by the factory are expected to provide the [options interfaces](options/interface.go):
+
+* Required
+  * LoggerInterface
+  * URLInterface
+* Optional
+  * CLIInterface if additional CLI arguments specific to the forge are supported
+
+For instance [forges/forgejo/options/options.go](forges/forgejo/options/options.go) is created by [forges/forgejo/options.go](forges/forgejo/options.go).
+
+### Driver implementation
+
+A driver for a forge must be self contained in a directory (e.g. [forges/forgejo](forges/forgejo)). Functions shared by multiple forges are grouped in the [forges/helpers](forges/helpers) directory and split into one directory per `Kind` (e.g. [forges/helpers/pullrequest](forges/helpers/pullrequest)).
+
+* [options.go](forges/forgejo/options.go) defines the name of the forge in the Name variable (e.g. Name = "forgejo")
+* [options/options.go](forges/forgejo/options/options.go) defines the options specific to the forge and the corresponding CLI flags
+* [main.go](forges/forgejo/main.go) calls f3_tree.RegisterForgeFactory to create the forge given its name
+* [tree.go](forges/forgejo/tree.go) has the `Factory()` function that maps a node kind (`issue`, `reaction`, etc.) into an object that is capable of interacting with it (CRUD).
+* one file per `Kind` (e.g. [forges/forgejo/issues.go](forges/forgejo/issues.go)).
+
+### Idempotency
+
+Mirroring is idempotent: it will produce the same result if repeated multiple times. The drivers functions are not required to be idempotent.
+
+* The `Put` function will only be called if the resource does not already exist.
+* The `Patch` and `Delete` functions will only be called if the resource exists.
+
+### Identifiers mapping
+
+When a forge (e.g. Forgejo) is mirrored on the filesystem, the identifiers are preserved verbatim (e.g. the `issue` identifier). When the filesystem is mirrored to a forge, the identifiers cannot always be preserved. For instance if an `issue` with the identifier 1234 is downloaded from Forgejo and created on another Forgejo instance, it will be allocated an identifier by the Forgejo instance. It cannot request to be given a specific identifier.
+
+### References
+
+A F3 resource may reference another F3 resource by a path. For instance the user that authored an issue is represented by `/forge/users/1234` where `1234` is the unique identifier of the user. The reference is relative to the forge. The mirroring of a forge to another is responsible for converting the references using the identifier mapping stored in the origin forge. For instance if `/forge/users/1234` stored in the filesystem is created in Forgejo as `/forge/users/58`, the `issue` stored in the filesystem with its authored as `/forge/users/1234` will be created in Forgejo to be authored by `/forge/users/58` instead.
+
+### Logger
+
+The [tree/generic](tree/generic) has a pointer to a logger implementing [logger.Interface](logger/interface.go) which is made available to the nodes and the drivers.
+
+### Context
+
+All functions except for setters and getters have a `context.Context` argument which is checked (using [util/terminate.go](util/terminate.go)) to not be `Done` before performing a long lasting operation (e.g. a REST API call or a call to the Git CLI). It is not used otherwise.
+
+### Error model
+
+When an error that cannot be recovered from happens, `panic` is called, otherwise an `Error` is logged.
+
+### CLI
+
+The CLI is in [cmd](cmd) and relies on [options](options) to figure out which options are to be implemented for each supported forge.
+
+## Hacking
+
+### Local tests
+
+The forge instance is deleted before each run and left running for forensic analysis when the run completes.
+
+```sh
+./tests/run.sh test_forgejo # http://0.0.0.0:3001 user root, password admin1234
+./tests/run.sh test_gitlab # http://0.0.0.0:8181 user root, password Wrobyak4
+./tests/run.sh test_gitea # http://0.0.0.0:3001 user root, password admin1234
+```
+
+Restart a new forge with:
+
+```sh
+./tests/run.sh run_forgejo # http://0.0.0.0:3001 user root, password admin1234
+./tests/run.sh run_gitlab # http://0.0.0.0:8181 user root, password Wrobyak4
+./tests/run.sh run_gitea # http://0.0.0.0:3001 user root, password admin1234
+```
+
+The compliance test resources are deleted, except if the environment variable `GOF3_TEST_COMPLIANCE_CLEANUP=false`.
+
+```sh
+GOF3_TEST_COMPLIANCE_CLEANUP=false GOF3_FORGEJO_HOST_PORT=0.0.0.0:3001 go test -run=TestF3Forge/forgejo -v code.forgejo.org/f3/gof3/...
+```
+
+### Code coverage
+
+```sh
+export SCRATCHDIR=/tmp/gof3
+./tests/run.sh # collect coverage for every test
+./tests/run.sh run_forgejo # update coverage for forgejo
+./tests/run.sh test_merge_coverage # merge coverage from every test
+go tool cover -func /tmp/gof3/merged.out # show coverage per function
+uncover /tmp/gof3/merged.out GeneratorSetReviewComment # show which lines of the GeneratorSetReviewComment function are not covered
+```
+
+### F3 schemas
+
+The JSON schemas come from [the f3-schemas repository](https://code.forgejo.org/f3/f3-schemas) and
+should be updated as follows:
+
+```
+cd f3 ; rm -fr schemas ; git --work-tree schemas clone https://code.forgejo.org/f3/f3-schemas ; rm -fr f3-schemas schemas/.gitignore schemas/.forgejo
+```
+
+## Funding
+
+See the page dedicated to funding in the [F3 documentation](https://f3.forgefriends.org/funding.html)
--- a/api/api.go
+++ b/api/api.go
@ -0,0 +1,24 @@
+// Copyright Earl Warren <contact@earl-warren.org>
+// Copyright Loïc Dachary <loic@dachary.org>
+// SPDX-License-Identifier: MIT
+
+package api
+
+import (
+	"context"
+
+	"code.forgejo.org/f3/gof3/v3/path"
+	"code.forgejo.org/f3/gof3/v3/tree/generic"
+	"code.forgejo.org/f3/gof3/v3/util"
+)
+
+func TreeMirror(ctx context.Context, originTree, destinationTree generic.TreeInterface, p path.Path, options *generic.MirrorOptions) error {
+	err := util.PanicToError(func() {
+		generic.TreeMirror(ctx, originTree, destinationTree, p, options)
+	})
+	if err != nil {
+		originTree.Error(err.Error())
+		originTree.Debug(err.Stack())
+	}
+	return err
+}
--- a/cmd/cli.go
+++ b/cmd/cli.go
@ -0,0 +1,49 @@
+// Copyright Earl Warren <contact@earl-warren.org>
+// Copyright Loïc Dachary <loic@dachary.org>
+// SPDX-License-Identifier: MIT
+
+package cmd
+
+import (
+	"fmt"
+	"sort"
+
+	filesystem_options "code.forgejo.org/f3/gof3/v3/forges/filesystem/options"
+	"code.forgejo.org/f3/gof3/v3/options"
+
+	"github.com/urfave/cli/v3"
+)
+
+func ForgeTypeOption(direction string) string {
+	return direction + "-type"
+}
+
+func GetFlagsCommon(prefix, category string) []cli.Flag {
+	flags := make([]cli.Flag, 0, 10)
+
+	forgeTypes := make([]string, 0, 10)
+	for name := range options.GetFactories() {
+		forgeTypes = append(forgeTypes, name)
+	}
+	sort.Strings(forgeTypes)
+	values := &enumType{
+		Enum:    forgeTypes,
+		Default: filesystem_options.Name,
+	}
+
+	flags = append(flags, &cli.GenericFlag{
+		Name:        ForgeTypeOption(prefix),
+		Usage:       fmt.Sprintf("`TYPE` of the %s forge", prefix),
+		Value:       values,
+		DefaultText: values.GetDefaultText(),
+		Category:    prefix,
+	})
+
+	flags = append(flags, &cli.StringFlag{
+		Name:     BuildForgePrefix(prefix, "path"),
+		Usage:    "resource to mirror (e.g. /forge/users/myuser/projects/myproject)",
+		Category: prefix,
+	})
+
+	return flags
+}
--- a/cmd/enumtype.go
+++ b/cmd/enumtype.go
@ -0,0 +1,48 @@
+// SPDX-License-Identifier: MIT
+
+package cmd
+
+import (
+	"fmt"
+	"strings"
+)
+
+type enumType struct {
+	Enum     []string
+	Default  string
+	selected string
+}
+
+func (o enumType) Join() string {
+	return strings.Join(o.Enum, ",")
+}
+
+func (o *enumType) Set(value string) error {
+	for _, enum := range o.Enum {
+		if strings.EqualFold(enum, value) {
+			o.selected = value
+			return nil
+		}
+	}
+
+	return fmt.Errorf("%v", o.Allowed())
+}
+
+func (o *enumType) Allowed() string {
+	return fmt.Sprintf("allowed values are %s", o.Join())
+}
+
+func (o *enumType) GetDefaultText() string {
+	return fmt.Sprintf("%s, %s", o.Default, o.Allowed())
+}
+
+func (o enumType) Get() any {
+	return o.String()
+}
+
+func (o enumType) String() string {
+	if o.selected == "" {
+		return o.Default
+	}
+	return o.selected
+}
--- a/cmd/main.go
+++ b/cmd/main.go
@ -0,0 +1,49 @@
+// Copyright Earl Warren <contact@earl-warren.org>
+// Copyright Loïc Dachary <loic@dachary.org>
+// SPDX-License-Identifier: MIT
+
+package cmd
+
+import (
+	"context"
+
+	"code.forgejo.org/f3/gof3/v3/logger"
+
+	"github.com/urfave/cli/v3"
+)
+
+var Version = "development"
+
+func SetVerbosity(ctx context.Context, verbosity int) {
+	l := logger.ContextGetLogger(ctx)
+	switch verbosity {
+	case 0:
+		l.SetLevel(logger.Info)
+	default:
+		l.SetLevel(logger.Trace)
+	}
+}
+
+func NewApp() *cli.Command {
+	return &cli.Command{
+		Name:        "F3",
+		Usage:       "Friendly Forge Format",
+		Description: `Friendly Forge Format`,
+		Version:     Version,
+		Before: func(ctx context.Context, c *cli.Command) (context.Context, error) {
+			SetVerbosity(ctx, c.Count("verbose"))
+			return nil, nil
+		},
+		Commands: []*cli.Command{
+			CreateCmdMirror(),
+		},
+		Flags: []cli.Flag{
+			&cli.BoolFlag{
+				Name:  "verbose",
+				Usage: "increase the verbosity level",
+			},
+			cli.VersionFlag,
+		},
+		EnableShellCompletion: true,
+	}
+}
--- a/cmd/mirror.go
+++ b/cmd/mirror.go
@ -0,0 +1,129 @@
+// Copyright Earl Warren <contact@earl-warren.org>
+// Copyright Loïc Dachary <loic@dachary.org>
+// SPDX-License-Identifier: MIT
+
+package cmd
+
+import (
+	"context"
+	"fmt"
+
+	"code.forgejo.org/f3/gof3/v3/logger"
+	"code.forgejo.org/f3/gof3/v3/options"
+	"code.forgejo.org/f3/gof3/v3/path"
+	"code.forgejo.org/f3/gof3/v3/tree/generic"
+	"code.forgejo.org/f3/gof3/v3/util"
+
+	"github.com/urfave/cli/v3"
+)
+
+var (
+	directionFrom = "from"
+	flagFrom      = "--" + directionFrom
+	directionTo   = "to"
+	flagTo        = "--" + directionTo
+)
+
+func BuildForgePrefix(prefix, forge string) string {
+	return prefix + "-" + forge
+}
+
+func FlagsToTree(ctx context.Context, c *cli.Command, direction string) generic.TreeInterface {
+	forgeType := c.String(ForgeTypeOption(direction))
+	opts := options.GetFactory(forgeType)()
+	opts.(options.LoggerInterface).SetLogger(logger.ContextGetLogger(ctx))
+	if o, ok := opts.(options.CLIInterface); ok {
+		o.FromFlags(ctx, c, BuildForgePrefix(direction, forgeType))
+	} else {
+		panic("not implemented")
+	}
+	return generic.GetFactory("f3")(ctx, opts)
+}
+
+func CreateCmdMirror() *cli.Command {
+	flags := make([]cli.Flag, 0, 10)
+	for _, direction := range []string{"from", "to"} {
+		flags = append(flags, GetFlagsCommon(direction, "common")...)
+		for name, factory := range options.GetFactories() {
+			if opts, ok := factory().(options.CLIInterface); ok {
+				flags = append(flags, opts.GetFlags(BuildForgePrefix(direction, name), name)...)
+			}
+		}
+	}
+
+	flags = func(flags []cli.Flag) []cli.Flag {
+		dedup := make([]cli.Flag, 0, 10)
+		names := make(map[string]any, 10)
+	flagLoop:
+		for _, flag := range flags {
+			for _, name := range flag.Names() {
+				_, found := names[name]
+				if found {
+					continue flagLoop
+				}
+			}
+			dedup = append(dedup, flag)
+			for _, name := range flag.Names() {
+				names[name] = nil
+			}
+		}
+		return dedup
+	}(flags)
+
+	return &cli.Command{
+		Name:        "mirror",
+		Usage:       "Mirror",
+		Description: "Mirror",
+		Action: func(ctx context.Context, c *cli.Command) error {
+			return util.PanicToError(func() { runMirror(ctx, c) })
+		},
+		Flags: flags,
+	}
+}
+
+func runMirror(ctx context.Context, c *cli.Command) {
+	from := FlagsToTree(ctx, c, directionFrom)
+	to := FlagsToTree(ctx, c, directionTo)
+	fromPathString := c.String(BuildForgePrefix(directionFrom, "path"))
+	fromPath := generic.NewPathFromString(fromPathString)
+	toPathString := c.String(BuildForgePrefix(directionTo, "path"))
+	toPath := generic.NewPathFromString(toPathString)
+
+	log := from.GetLogger()
+
+	fromURL := "(unset)"
+	if url, ok := from.GetOptions().(options.URLInterface); ok {
+		fromURL = url.GetURL()
+	}
+	toURL := "(unset)"
+	if url, ok := to.GetOptions().(options.URLInterface); ok {
+		toURL = url.GetURL()
+	}
+	log.Info("mirror %s (%s at %s) to %s (%s at %s)",
+		fromPath, c.String(ForgeTypeOption(directionFrom)), fromURL,
+		toPath, c.String(ForgeTypeOption(directionTo)), toURL,
+	)
+
+	log.Debug("read %s from %T", fromPath, from)
+	var fromNode generic.NodeInterface
+	fromNode = generic.NilNode
+	walkAndGet := func(ctx context.Context, parent, p path.Path, node generic.NodeInterface) {
+		node.WalkAndGet(ctx, parent, generic.NewWalkOptions(nil))
+		fromNode = node
+	}
+	from.ApplyAndGet(ctx, fromPath, generic.NewApplyOptions(walkAndGet))
+	if fromNode == generic.NilNode {
+		panic(fmt.Errorf("from %s not found", fromPath))
+	}
+	from.Debug("copy %s from %T to %T", fromPath, from, to)
+
+	if toPathString == "" {
+		generic.TreeMirror(ctx, from, to, fromPath, generic.NewMirrorOptions())
+	} else {
+		toNode := to.FindAndGet(ctx, toPath)
+		if toNode == generic.NilNode {
+			panic(fmt.Errorf("to %s not found", toPath))
+		}
+		generic.NodeMirror(ctx, fromNode, toNode, generic.NewMirrorOptions())
+	}
+}
--- a/cmd/mirror_test.go
+++ b/cmd/mirror_test.go
@ -0,0 +1,139 @@
+// Copyright Earl Warren <contact@earl-warren.org>
+// Copyright Loïc Dachary <loic@dachary.org>
+// SPDX-License-Identifier: MIT
+
+package cmd
+
+import (
+	"context"
+	"fmt"
+	"testing"
+
+	filesystem_options "code.forgejo.org/f3/gof3/v3/forges/filesystem/options"
+	forgejo_options "code.forgejo.org/f3/gof3/v3/forges/forgejo/options"
+	"code.forgejo.org/f3/gof3/v3/options"
+	"code.forgejo.org/f3/gof3/v3/tree/generic"
+	f3_tests "code.forgejo.org/f3/gof3/v3/tree/tests/f3"
+	tests_forge "code.forgejo.org/f3/gof3/v3/tree/tests/f3/forge"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func Test_CmdMirrorArguments(t *testing.T) {
+	ctx := context.Background()
+
+	output, err := runApp(ctx, "f3", "mirror", "--from-type", "garbage")
+	assert.ErrorContains(t, err, `allowed values are `)
+	assert.Contains(t, output, "Incorrect Usage:")
+}
+
+func Test_CmdMirrorIntegrationDefaultToPath(t *testing.T) {
+	ctx := context.Background()
+
+	fixtureOptions := tests_forge.GetFactory(filesystem_options.Name)().NewOptions(t)
+	fixtureTree := generic.GetFactory("f3")(ctx, fixtureOptions)
+	log := fixtureTree.GetLogger()
+	log.Trace("======= build fixture")
+	f3_tests.TreeBuild(t, "CmdMirrorDefault", fixtureOptions, fixtureTree)
+
+	log.Trace("======= create mirror")
+	mirrorOptions := tests_forge.GetFactory(filesystem_options.Name)().NewOptions(t)
+	mirrorTree := generic.GetFactory("f3")(ctx, mirrorOptions)
+
+	p := "/forge/users/10111"
+	log.Trace("======= mirror %s", p)
+	output, err := runApp(ctx, "f3", "--verbose", "mirror",
+		"--from-filesystem-directory", fixtureOptions.(options.URLInterface).GetURL(),
+		"--from-path", p,
+		"--to-filesystem-directory", mirrorOptions.(options.URLInterface).GetURL(),
+	)
+	log.Trace("======= assert")
+	assert.NoError(t, err)
+	require.Contains(t, output, fmt.Sprintf("mirror %s (filesystem", p))
+
+	mirrorTree.WalkAndGet(ctx, generic.NewWalkOptions(nil))
+	found := mirrorTree.Find(generic.NewPathFromString(p))
+	require.NotEqualValues(t, found, generic.NilNode)
+	assert.EqualValues(t, p, found.GetCurrentPath().String())
+}
+
+func Test_CmdMirrorIntegrationSpecificToPath(t *testing.T) {
+	ctx := context.Background()
+
+	mirrorOptions := tests_forge.GetFactory(forgejo_options.Name)().NewOptions(t)
+	mirrorTree := generic.GetFactory("f3")(ctx, mirrorOptions)
+
+	fixtureOptions := tests_forge.GetFactory(filesystem_options.Name)().NewOptions(t)
+	fixtureTree := generic.GetFactory("f3")(ctx, fixtureOptions)
+
+	log := fixtureTree.GetLogger()
+	creator := f3_tests.NewCreator(t, "CmdMirrorSpecific", log)
+
+	log.Trace("======= build fixture")
+
+	var fromPath string
+	{
+		fixtureUserID := "userID01"
+		fixtureProjectID := "projectID01"
+
+		userFormat := creator.GenerateUser()
+		userFormat.SetID(fixtureUserID)
+		users := fixtureTree.MustFind(generic.NewPathFromString("/forge/users"))
+		user := users.CreateChild(ctx)
+		user.FromFormat(userFormat)
+		user.Upsert(ctx)
+		require.EqualValues(t, user.GetID(), users.GetIDFromName(ctx, userFormat.UserName))
+
+		projectFormat := creator.GenerateProject()
+		projectFormat.SetID(fixtureProjectID)
+		projects := user.MustFind(generic.NewPathFromString("projects"))
+		project := projects.CreateChild(ctx)
+		project.FromFormat(projectFormat)
+		project.Upsert(ctx)
+		require.EqualValues(t, project.GetID(), projects.GetIDFromName(ctx, projectFormat.Name))
+
+		fromPath = fmt.Sprintf("/forge/users/%s/projects/%s", userFormat.UserName, projectFormat.Name)
+	}
+
+	log.Trace("======= create mirror")
+
+	var toPath string
+	var projects generic.NodeInterface
+	{
+		userFormat := creator.GenerateUser()
+		users := mirrorTree.MustFind(generic.NewPathFromString("/forge/users"))
+		user := users.CreateChild(ctx)
+		user.FromFormat(userFormat)
+		user.Upsert(ctx)
+		require.EqualValues(t, user.GetID(), users.GetIDFromName(ctx, userFormat.UserName))
+
+		projectFormat := creator.GenerateProject()
+		projects = user.MustFind(generic.NewPathFromString("projects"))
+		project := projects.CreateChild(ctx)
+		project.FromFormat(projectFormat)
+		project.Upsert(ctx)
+		require.EqualValues(t, project.GetID(), projects.GetIDFromName(ctx, projectFormat.Name))
+
+		toPath = fmt.Sprintf("/forge/users/%s/projects/%s", userFormat.UserName, projectFormat.Name)
+	}
+
+	log.Trace("======= mirror %s", fromPath)
+	output, err := runApp(ctx, "f3", "--verbose", "mirror",
+		"--from-type", filesystem_options.Name,
+		"--from-path", fromPath,
+		"--from-filesystem-directory", fixtureOptions.(options.URLInterface).GetURL(),
+
+		"--to-type", forgejo_options.Name,
+		"--to-path", toPath,
+		"--to-forgejo-user", mirrorOptions.(options.AuthInterface).GetUsername(),
+		"--to-forgejo-password", mirrorOptions.(options.AuthInterface).GetPassword(),
+		"--to-forgejo-url", mirrorOptions.(options.URLInterface).GetURL(),
+	)
+	assert.NoError(t, err)
+	log.Trace("======= assert")
+	require.Contains(t, output, fmt.Sprintf("mirror %s", fromPath))
+	projects.List(ctx)
+	require.NotEmpty(t, projects.GetChildren())
+	log.Trace("======= project %s", projects.GetChildren()[0])
+}
--- a/cmd/signal.go
+++ b/cmd/signal.go
@ -0,0 +1,33 @@
+// Copyright Earl Warren <contact@earl-warren.org>
+// Copyright Loïc Dachary <loic@dachary.org>
+// SPDX-License-Identifier: MIT
+
+package cmd
+
+import (
+	"context"
+	"os"
+	"os/signal"
+	"syscall"
+)
+
+func InstallSignals() (context.Context, context.CancelFunc) {
+	ctx, cancel := context.WithCancel(context.Background())
+	go func() {
+		signalChannel := make(chan os.Signal, 1)
+
+		signal.Notify(
+			signalChannel,
+			syscall.SIGINT,
+			syscall.SIGTERM,
+		)
+		select {
+		case <-signalChannel:
+		case <-ctx.Done():
+		}
+		cancel()
+		signal.Reset()
+	}()
+
+	return ctx, cancel
+}
--- a/cmd/testhelpers.go
+++ b/cmd/testhelpers.go
@ -0,0 +1,38 @@
+// Copyright Earl Warren <contact@earl-warren.org>
+// Copyright Loïc Dachary <loic@dachary.org>
+// SPDX-License-Identifier: MIT
+
+package cmd
+
+import (
+	"context"
+	"fmt"
+
+	"code.forgejo.org/f3/gof3/v3/logger"
+	// allow forges to register
+	_ "code.forgejo.org/f3/gof3/v3/forges/filesystem"
+	_ "code.forgejo.org/f3/gof3/v3/forges/forgejo"
+)
+
+func runApp(ctx context.Context, args ...string) (string, error) {
+	l := logger.NewCaptureLogger()
+	ctx = logger.ContextSetLogger(ctx, l)
+
+	app := NewApp()
+
+	app.Writer = l.GetBuffer()
+	app.ErrWriter = l.GetBuffer()
+
+	defer func() {
+		if r := recover(); r != nil {
+			fmt.Println(l.String())
+			panic(r)
+		}
+	}()
+
+	err := app.Run(ctx, args)
+
+	fmt.Println(l.String())
+
+	return l.String(), err
+}
--- a/f3/ci.go
+++ b/f3/ci.go
@ -0,0 +1,20 @@
+// Copyright Earl Warren <contact@earl-warren.org>
+// Copyright Loïc Dachary <loic@dachary.org>
+// Copyright twenty-panda <twenty-panda@posteo.com>
+// SPDX-License-Identifier: MIT
+
+package f3
+
+type CI struct {
+	Common
+}
+
+func (o CI) Equal(other CI) bool {
+	return o.Common.Equal(other.Common)
+}
+
+func (o *CI) Clone() Interface {
+	clone := &CI{}
+	*clone = *o
+	return clone
+}
--- a/f3/comment.go
+++ b/f3/comment.go
@ -0,0 +1,35 @@
+// Copyright Earl Warren <contact@earl-warren.org>
+// Copyright Loïc Dachary <loic@dachary.org>
+// SPDX-License-Identifier: MIT
+
+package f3
+
+import "time"
+
+type Comment struct {
+	Common
+	PosterID *Reference `json:"poster_id"`
+	Created  time.Time  `json:"created"`
+	Updated  time.Time  `json:"updated"`
+	Content  string     `json:"content"`
+}
+
+func (o *Comment) GetReferences() References {
+	references := o.Common.GetReferences()
+	if !o.PosterID.IsNil() {
+		references = append(references, o.PosterID)
+	}
+	return references
+}
+
+func (o Comment) Equal(other Comment) bool {
+	return o.Common.Equal(other.Common) &&
+		nilOrEqual(o.PosterID, other.PosterID) &&
+		o.Content == other.Content
+}
+
+func (o *Comment) Clone() Interface {
+	clone := &Comment{}
+	*clone = *o
+	return clone
+}
--- a/f3/equal.go
+++ b/f3/equal.go
@ -0,0 +1,37 @@
+// Copyright limiting-factor <limiting-factor@posteo.com>
+// SPDX-License-Identifier: MIT
+
+package f3
+
+import (
+	"time"
+)
+
+type equalConstraint[T any] interface {
+	Equal(T) bool
+	*T
+}
+
+func nilOrEqual[P any, T equalConstraint[P]](a, b T) bool {
+	return (a == nil && b == nil) ||
+		(a != nil && b != nil && a.Equal(*b))
+}
+
+func arrayEqual[P any, T equalConstraint[P]](a, b []T) bool {
+	if len(a) != len(b) {
+		return false
+	}
+
+	for i := 0; i < len(a); i++ {
+		if !nilOrEqual(a[i], b[i]) {
+			return false
+		}
+	}
+
+	return true
+}
+
+func nilOrEqualTimeToDate(a, b *time.Time) bool {
+	return (a == nil && b == nil) ||
+		(a != nil && b != nil && a.Format(time.DateOnly) == b.Format(time.DateOnly))
+}
--- a/f3/equal_test.go
+++ b/f3/equal_test.go
@ -0,0 +1,53 @@
+// Copyright limiting-factor <limiting-factor@posteo.com>
+// SPDX-License-Identifier: MIT
+
+package f3
+
+import (
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+type s struct {
+	v int
+}
+
+func (o s) Equal(other s) bool {
+	return o.v == other.v
+}
+
+func TestNilOrEqual(t *testing.T) {
+	s1 := &s{1}
+	s2 := &s{1}
+	s3 := &s{2}
+	assert.True(t, nilOrEqual[s](nil, nil))
+	assert.False(t, nilOrEqual(s1, nil))
+	assert.False(t, nilOrEqual(nil, s2))
+	assert.True(t, nilOrEqual(s1, s2))
+	assert.False(t, nilOrEqual(s1, s3))
+}
+
+func TestArrayEqual(t *testing.T) {
+	s1 := []*s{{1}, {2}}
+	s2 := []*s{{1}, {2}}
+	s3 := []*s{{1}, {2}, {3}}
+	assert.True(t, arrayEqual(s1, s2))
+	assert.False(t, arrayEqual(s1, s3))
+}
+
+func TestNilOrEqualTimeToDate(t *testing.T) {
+	t1, err := time.Parse(time.RFC3339, "2006-01-02T15:04:05Z")
+	require.NoError(t, err)
+	t2, err := time.Parse(time.RFC3339, "2006-01-02T00:01:00Z")
+	require.NoError(t, err)
+	t3, err := time.Parse(time.RFC3339, "2026-01-02T11:01:00Z")
+	require.NoError(t, err)
+	assert.True(t, nilOrEqualTimeToDate(nil, nil))
+	assert.False(t, nilOrEqualTimeToDate(&t1, nil))
+	assert.False(t, nilOrEqualTimeToDate(nil, &t2))
+	assert.True(t, nilOrEqualTimeToDate(&t1, &t2))
+	assert.False(t, nilOrEqualTimeToDate(&t1, &t3))
+}
--- a/f3/file_format.go
+++ b/f3/file_format.go
@ -0,0 +1,109 @@
+// Copyright Earl Warren <contact@earl-warren.org>
+// Copyright Loïc Dachary <loic@dachary.org>
+// SPDX-License-Identifier: MIT
+
+package f3
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+
+	"github.com/santhosh-tekuri/jsonschema/v6"
+)
+
+// Load project data from file, with optional validation
+func Load(filename string, data any, validation bool) error {
+	bs, err := os.ReadFile(filename)
+	if err != nil {
+		return err
+	}
+
+	if validation {
+		err := validate(bs, data)
+		if err != nil {
+			return err
+		}
+	}
+	return unmarshal(bs, data)
+}
+
+func Store(filename string, data any) error {
+	f, err := os.Create(filename)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+	bs, err := json.MarshalIndent(data, "", "    ")
+	if err != nil {
+		return err
+	}
+	if _, err := f.Write(bs); err != nil {
+		return err
+	}
+	if _, err := f.Write([]byte("\n")); err != nil {
+		return err
+	}
+	return nil
+}
+
+func unmarshal(bs []byte, data any) error {
+	return json.Unmarshal(bs, data)
+}
+
+func getSchema(filename string) (*jsonschema.Schema, error) {
+	c := jsonschema.NewCompiler()
+	return c.Compile(filename)
+}
+
+func validate(bs []byte, datatype any) error {
+	var v any
+	err := unmarshal(bs, &v)
+	if err != nil {
+		return err
+	}
+
+	var schemaFilename string
+	switch datatype := datatype.(type) {
+	case *User:
+		schemaFilename = "schemas/user.json"
+	case *Organization:
+		schemaFilename = "schemas/organization.json"
+	case *Project:
+		schemaFilename = "schemas/project.json"
+	case *Topic:
+		schemaFilename = "schemas/topic.json"
+	case *Issue:
+		schemaFilename = "schemas/issue.json"
+	case *PullRequest:
+		schemaFilename = "schemas/pullrequest.json"
+	case *Label:
+		schemaFilename = "schemas/label.json"
+	case *Milestone:
+		schemaFilename = "schemas/milestone.json"
+	case *Release:
+		schemaFilename = "schemas/release.json"
+	case *ReleaseAsset:
+		schemaFilename = "schemas/releaseasset.json"
+	case *Comment:
+		schemaFilename = "schemas/comment.json"
+	case *Reaction:
+		schemaFilename = "schemas/reaction.json"
+	case *Repository:
+		schemaFilename = "schemas/repository.json"
+	case *Review:
+		schemaFilename = "schemas/review.json"
+	case *ReviewComment:
+		schemaFilename = "schemas/reviewcomment.json"
+	case *CI:
+		schemaFilename = "schemas/ci.json"
+	default:
+		return fmt.Errorf("file_format:validate: %T does not have a schema that could be used for validation", datatype)
+	}
+
+	sch, err := getSchema(schemaFilename)
+	if err != nil {
+		return err
+	}
+	return sch.Validate(v)
+}
--- a/f3/file_format_test.go
+++ b/f3/file_format_test.go
@ -0,0 +1,166 @@
+// Copyright Earl Warren <contact@earl-warren.org>
+// Copyright Loïc Dachary <loic@dachary.org>
+// SPDX-License-Identifier: MIT
+
+package f3
+
+import (
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"github.com/santhosh-tekuri/jsonschema/v6"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestStoreLoad(t *testing.T) {
+	tmpDir := t.TempDir()
+
+	type S struct {
+		A int
+		B string
+	}
+	original := S{A: 1, B: "B"}
+	p := filepath.Join(tmpDir, "s.json")
+	assert.NoError(t, Store(p, original))
+	var loaded S
+	assert.NoError(t, Load(p, &loaded, false))
+	assert.EqualValues(t, original, loaded)
+}
+
+func TestF3_CI(t *testing.T) {
+	var ci CI
+	err := Load("file_format_testdata/ci/good.json", &ci, true)
+	assert.NoError(t, err)
+	err = Load("file_format_testdata/ci/bad.json", &ci, true)
+	assert.ErrorContains(t, err, "'/index': value must be one of")
+}
+
+func TestF3_User(t *testing.T) {
+	var user User
+	err := Load("file_format_testdata/user/good.json", &user, true)
+	assert.NoError(t, err)
+	err = Load("file_format_testdata/user/bad.json", &user, true)
+	assert.ErrorContains(t, err, "missing properties 'index'")
+}
+
+func TestF3_Organization(t *testing.T) {
+	var organization Organization
+	err := Load("file_format_testdata/organization/good.json", &organization, true)
+	assert.NoError(t, err)
+	err = Load("file_format_testdata/organization/bad.json", &organization, true)
+	assert.ErrorContains(t, err, "missing properties 'index'")
+}
+
+func TestF3_Project(t *testing.T) {
+	var project Project
+	err := Load("file_format_testdata/project/good.json", &project, true)
+	assert.NoError(t, err)
+	err = Load("file_format_testdata/project/bad.json", &project, true)
+	assert.ErrorContains(t, err, "'/stars': got string, want number")
+}
+
+func TestF3_Issue(t *testing.T) {
+	var issue Issue
+	err := Load("file_format_testdata/issue/good.json", &issue, true)
+	assert.NoError(t, err)
+	err = Load("file_format_testdata/issue/bad.json", &issue, true)
+	assert.ErrorContains(t, err, "missing property 'index'")
+}
+
+func TestF3_PullRequest(t *testing.T) {
+	var pullRequest PullRequest
+	err := Load("file_format_testdata/pullrequest/good.json", &pullRequest, true)
+	assert.NoError(t, err)
+	err = Load("file_format_testdata/pullrequest/bad.json", &pullRequest, true)
+	assert.ErrorContains(t, err, "missing properties 'index'")
+}
+
+func TestF3_Release(t *testing.T) {
+	var release Release
+	err := Load("file_format_testdata/release/good.json", &release, true)
+	assert.NoError(t, err)
+	err = Load("file_format_testdata/release/bad.json", &release, true)
+	assert.ErrorContains(t, err, "missing properties 'index'")
+}
+
+func TestF3_ReleaseAsset(t *testing.T) {
+	var releaseAsset ReleaseAsset
+	err := Load("file_format_testdata/releaseasset/good.json", &releaseAsset, true)
+	assert.NoError(t, err)
+	err = Load("file_format_testdata/releaseasset/bad.json", &releaseAsset, true)
+	assert.ErrorContains(t, err, "missing properties 'index'")
+}
+
+func TestF3_Comment(t *testing.T) {
+	var comment Comment
+	err := Load("file_format_testdata/comment/good.json", &comment, true)
+	assert.NoError(t, err)
+	err = Load("file_format_testdata/comment/bad.json", &comment, true)
+	assert.ErrorContains(t, err, "'/created': 'AAAAAAAAA' is not valid date-time")
+}
+
+func TestF3_Label(t *testing.T) {
+	var label Label
+	err := Load("file_format_testdata/label/good.json", &label, true)
+	assert.NoError(t, err)
+	err = Load("file_format_testdata/label/bad.json", &label, true)
+	assert.ErrorContains(t, err, "'/exclusive': got string, want boolean")
+}
+
+func TestF3_Milestone(t *testing.T) {
+	var milestone Milestone
+	err := Load("file_format_testdata/milestone/good.json", &milestone, true)
+	assert.NoError(t, err)
+	err = Load("file_format_testdata/milestone/bad.json", &milestone, true)
+	assert.ErrorContains(t, err, "missing properties 'index'")
+}
+
+func TestF3_Review(t *testing.T) {
+	var review Review
+	err := Load("file_format_testdata/review/good.json", &review, true)
+	assert.NoError(t, err)
+	err = Load("file_format_testdata/review/bad.json", &review, true)
+	assert.ErrorContains(t, err, "missing properties 'index'")
+}
+
+func TestF3_Reaction(t *testing.T) {
+	var reaction Reaction
+	err := Load("file_format_testdata/reaction/good.json", &reaction, true)
+	assert.NoError(t, err)
+	err = Load("file_format_testdata/reaction/bad.json", &reaction, true)
+	assert.ErrorContains(t, err, "missing properties 'index'")
+}
+
+func TestF3_Repository(t *testing.T) {
+	var repository Repository
+	err := Load("file_format_testdata/repository/good.json", &repository, true)
+	assert.NoError(t, err)
+	err = Load("file_format_testdata/repository/bad.json", &repository, true)
+	assert.ErrorContains(t, err, "missing property 'name'")
+}
+
+func TestF3_ReviewComment(t *testing.T) {
+	var reviewComment ReviewComment
+	err := Load("file_format_testdata/reviewcomment/good.json", &reviewComment, true)
+	assert.NoError(t, err)
+	err = Load("file_format_testdata/reviewcomment/bad.json", &reviewComment, true)
+	assert.ErrorContains(t, err, "missing properties 'index'")
+}
+
+func TestF3_Topic(t *testing.T) {
+	var topic Topic
+	err := Load("file_format_testdata/topic.json", &topic, true)
+	assert.NoError(t, err)
+}
+
+func TestF3_ValidationFail(t *testing.T) {
+	var issue Issue
+	err := Load("file_format_testdata/issue/bad.json", &issue, true)
+	if _, ok := err.(*jsonschema.ValidationError); ok {
+		errors := strings.Split(err.(*jsonschema.ValidationError).GoString(), "\n")
+		assert.Contains(t, errors[1], "missing property")
+	} else {
+		t.Fatalf("got: type %T with value %s, want: *jsonschema.ValidationError", err, err)
+	}
+}
--- a/f3/file_format_testdata/ci/bad.json
+++ b/f3/file_format_testdata/ci/bad.json
@ -0,0 +1,3 @@
+{
+    "index": "Unknown"
+}
--- a/f3/file_format_testdata/ci/good.json
+++ b/f3/file_format_testdata/ci/good.json
@ -0,0 +1,3 @@
+{
+    "index": "Forgejo Actions"
+}
--- a/f3/file_format_testdata/comment/bad.json
+++ b/f3/file_format_testdata/comment/bad.json
@ -0,0 +1,7 @@
+{
+    "index": "5",
+    "poster_id": "1",
+    "created": "AAAAAAAAA",
+    "updated": "1986-04-12T23:20:50.52Z",
+    "content": "comment_content_5"
+}
--- a/f3/file_format_testdata/comment/good.json
+++ b/f3/file_format_testdata/comment/good.json
@ -0,0 +1,14 @@
+{
+    "index": "5",
+    "poster_id": "/user/1",
+    "created": "1985-04-12T23:20:50.52Z",
+    "updated": "1986-04-12T23:20:50.52Z",
+    "content": "comment_content_5",
+    "reactions": [
+	{
+	    "index": "8",
+	    "user_id": "/user/23",
+	    "content": "laugh"
+	}
+    ]
+}
--- a/f3/file_format_testdata/issue/bad.json
+++ b/f3/file_format_testdata/issue/bad.json
@ -0,0 +1,20 @@
+{
+    "poster_id": "/forge/users/1",
+    "title": "title_a",
+    "content": "content_a",
+    "milestone": "../../milestones/23",
+    "state": "closed",
+    "is_locked": false,
+    "created": "1985-04-12T23:20:50.52Z",
+    "updated": "1986-04-12T23:20:50.52Z",
+    "closed": null,
+    "due": "1986-04-12",
+    "labels": [
+	"../../labels/435"
+    ],
+    "reactions": null,
+    "assignees": [
+	"/forge/users/1",
+	"/forge/users/2"
+    ]
+}
--- a/f3/file_format_testdata/issue/good.json
+++ b/f3/file_format_testdata/issue/good.json
@ -0,0 +1,21 @@
+{
+    "index": "1",
+    "poster_id": "/forge/users/1",
+    "title": "title_a",
+    "content": "content_a",
+    "milestone": "../../milestones/23",
+    "state": "closed",
+    "is_locked": false,
+    "created": "1985-04-12T23:20:50.52Z",
+    "updated": "1986-04-12T23:20:50.52Z",
+    "closed": "1986-04-12T23:20:50.52Z",
+    "due": "1986-04-12",
+    "labels": [
+	"../../labels/435"
+    ],
+    "reactions": [],
+    "assignees": [
+	"/forge/users/1",
+	"/forge/users/2"
+    ]
+}
--- a/f3/file_format_testdata/label/bad.json
+++ b/f3/file_format_testdata/label/bad.json
@ -0,0 +1,7 @@
+{
+    "index": "1",
+    "name": "label1",
+    "description": "label1 description",
+    "color": "ffffff",
+    "exclusive": "CCCCCCCC"
+}
--- a/f3/file_format_testdata/label/good.json
+++ b/f3/file_format_testdata/label/good.json
@ -0,0 +1,7 @@
+{
+    "index": "1",
+    "name": "label1",
+    "description": "label1 description",
+    "color": "ffffff",
+    "exclusive": false
+}
--- a/f3/file_format_testdata/milestone/bad.json
+++ b/f3/file_format_testdata/milestone/bad.json
@ -0,0 +1,2 @@
+{
+}
--- a/f3/file_format_testdata/milestone/good.json
+++ b/f3/file_format_testdata/milestone/good.json
@ -0,0 +1,10 @@
+{
+    "index": "1",
+    "title": "title_a",
+    "description": "description_a",
+    "deadline": "1988-04-12T23:20:50.52Z",
+    "created": "1985-04-12T23:20:50.52Z",
+    "updated": "1986-04-12T23:20:50.52Z",
+    "closed": "1987-04-12T23:20:50.52Z",
+    "state": "closed"
+}
--- a/f3/file_format_testdata/organization/bad.json
+++ b/f3/file_format_testdata/organization/bad.json
@ -0,0 +1,2 @@
+{
+}
--- a/f3/file_format_testdata/organization/good.json
+++ b/f3/file_format_testdata/organization/good.json
@ -0,0 +1,5 @@
+{
+    "index": "9",
+    "name": "orgunique",
+    "full_name": "Org Unique"
+}
--- a/f3/file_format_testdata/project/bad.json
+++ b/f3/file_format_testdata/project/bad.json
@ -0,0 +1,28 @@
+{
+    "index": "1",
+    "name": "projectname",
+    "is_private": false,
+    "is_mirror": false,
+    "description": "project description",
+    "default_branch": "main",
+    "repositories": [
+	{
+	    "name": "vcs",
+	    "vcs": "hg"
+	},
+	{
+	    "name": "vcs.wiki"
+	}
+    ],
+    "archived": true,
+    "archived_at": "1987-04-12T23:20:50.52Z",
+    "created": "1985-04-12T23:20:50.52Z",
+    "updated": "1986-04-12T23:20:50.52Z",
+    "url": "https://example.com",
+    "stars": "BBBBBB",
+    "has_ci": true,
+    "has_issues": true,
+    "has_packages": true,
+    "has_pull_requests": true,
+    "has_wiki": true
+}
--- a/f3/file_format_testdata/project/good.json
+++ b/f3/file_format_testdata/project/good.json
@ -0,0 +1,28 @@
+{
+    "index": "1",
+    "name": "projectname",
+    "is_private": false,
+    "is_mirror": false,
+    "description": "project description",
+    "default_branch": "main",
+    "repositories": [
+	{
+	    "name": "vcs",
+	    "vcs": "hg"
+	},
+	{
+	    "name": "vcs.wiki"
+	}
+    ],
+    "archived": true,
+    "archived_at": "1987-04-12T23:20:50.52Z",
+    "created": "1985-04-12T23:20:50.52Z",
+    "updated": "1986-04-12T23:20:50.52Z",
+    "url": "https://example.com",
+    "stars": 20,
+    "has_ci": true,
+    "has_issues": true,
+    "has_packages": true,
+    "has_pull_requests": true,
+    "has_wiki": true
+}
--- a/f3/file_format_testdata/pullrequest/bad.json
+++ b/f3/file_format_testdata/pullrequest/bad.json
@ -0,0 +1,2 @@
+{
+}
--- a/f3/file_format_testdata/pullrequest/good.json
+++ b/f3/file_format_testdata/pullrequest/good.json
@ -0,0 +1,32 @@
+{
+    "index": "1",
+    "poster_id": "/forgejo/users/1",
+    "title": "title_a",
+    "content": "content_a",
+    "milestone": "../../milestones/5",
+    "state": "closed",
+    "is_locked": false,
+    "created": "1985-04-12T23:20:50.52Z",
+    "updated": "1986-04-12T23:20:50.52Z",
+    "closed": "1986-04-12T23:20:50.52Z",
+    "labels": [
+	"../../labels/435"
+    ],
+    "reactions": [],
+    "assignees": [],
+    "merged": false,
+    "merged_time": "1986-04-12T23:20:50.52Z",
+    "merged_commit_sha": "shashasha",
+    "head": {
+	"clone_url": "head_clone_url",
+	"ref": "head_branch",
+	"sha": "head_sha",
+	"repository": "/forge/user/1/projects/2/repositories/vcs"
+    },
+    "base": {
+	"clone_url": "base_clone_url",
+	"ref": "base_branch",
+	"sha": "base _sha",
+	"repository": "/forge/user/3/projects/4/repositories/vcs"
+    }
+}
--- a/f3/file_format_testdata/reaction/bad.json
+++ b/f3/file_format_testdata/reaction/bad.json
@ -0,0 +1,2 @@
+{
+}
--- a/f3/file_format_testdata/reaction/good.json
+++ b/f3/file_format_testdata/reaction/good.json
@ -0,0 +1,5 @@
+{
+    "index": "8",
+    "user_id": "/forge/users/912",
+    "content": "laugh"
+}
--- a/f3/file_format_testdata/release/bad.json
+++ b/f3/file_format_testdata/release/bad.json
@ -0,0 +1,2 @@
+{
+}
--- a/f3/file_format_testdata/release/good.json
+++ b/f3/file_format_testdata/release/good.json
@ -0,0 +1,11 @@
+{
+    "index": "123",
+    "tag_name": "v12",
+    "target_commitish": "stable",
+    "name": "v12 name",
+    "body": "v12 body",
+    "draft": false,
+    "prerelease": false,
+    "publisher_id": "/forgejo/user/1",
+    "created": "1985-04-12T23:20:50.52Z"
+}
--- a/f3/file_format_testdata/releaseasset/bad.json
+++ b/f3/file_format_testdata/releaseasset/bad.json
@ -0,0 +1,2 @@
+{
+}
--- a/f3/file_format_testdata/releaseasset/good.json
+++ b/f3/file_format_testdata/releaseasset/good.json
@ -0,0 +1,11 @@
+{
+    "index": "5",
+    "name": "asset_5",
+    "content_type": "application/zip",
+    "size": 50,
+    "download_count": 10,
+    "download_url": "http://example.com/something",
+    "created": "1985-04-12T23:20:50.52Z",
+    "updated": "1986-04-12T23:20:50.52Z",
+    "sha256": "4c5b2f412017de78124ae3a063d08e76566eea0cba6deb2533fb176d816a54fc"
+}
--- a/f3/file_format_testdata/repository/bad.json
+++ b/f3/file_format_testdata/repository/bad.json
@ -0,0 +1,2 @@
+{
+}
--- a/f3/file_format_testdata/repository/good.json
+++ b/f3/file_format_testdata/repository/good.json
@ -0,0 +1,4 @@
+{
+    "name": "vcs.wiki",
+    "vcs": "fossil"
+}
--- a/f3/file_format_testdata/review/bad.json
+++ b/f3/file_format_testdata/review/bad.json
@ -0,0 +1,3 @@
+{
+}
+
--- a/f3/file_format_testdata/review/good.json
+++ b/f3/file_format_testdata/review/good.json
@ -0,0 +1,12 @@
+{
+    "index": "1",
+    "reviewer_id": "/forge/user/50",
+    "official": false,
+    "commit_id": "shashashasha",
+    "content": "cover review comment",
+    "created_at": "1985-04-12T23:20:50.52Z",
+    "state": "PENDING",
+    "dissmissed": false,
+    "stale": false
+}
+
--- a/f3/file_format_testdata/reviewcomment/bad.json
+++ b/f3/file_format_testdata/reviewcomment/bad.json
@ -0,0 +1,2 @@
+{
+}
--- a/f3/file_format_testdata/reviewcomment/good.json
+++ b/f3/file_format_testdata/reviewcomment/good.json
@ -0,0 +1,14 @@
+{
+    "index": "100",
+    "content": "review comment",
+    "tree_path": "dir/file1.txt",
+    "diff_hunk": "@@hunkhunk",
+    "line": 1,
+    "lines_count": 1,
+    "commit_id": "shashashasha",
+    "poster_id": "/forge/users/10",
+    "reactions": [],
+    "created_at": "1985-04-12T23:20:50.52Z",
+    "updated_at": "1985-04-12T23:20:50.52Z",
+    "resolver": "/forge/users/10"
+}
--- a/f3/file_format_testdata/topic.json
+++ b/f3/file_format_testdata/topic.json
@ -0,0 +1,4 @@
+{
+    "index": "1",
+    "name": "category1"
+}
--- a/f3/file_format_testdata/user/bad.json
+++ b/f3/file_format_testdata/user/bad.json
@ -0,0 +1,2 @@
+{
+}
--- a/f3/file_format_testdata/user/good.json
+++ b/f3/file_format_testdata/user/good.json
@ -0,0 +1,8 @@
+{
+    "index": "7",
+    "name": "User Name One",
+    "email": "user1@example.com",
+    "username": "user1",
+    "password": "gloxKainlo",
+    "admin": false
+}
--- a/f3/forge.go
+++ b/f3/forge.go
@ -0,0 +1,20 @@
+// Copyright Earl Warren <contact@earl-warren.org>
+// Copyright Loïc Dachary <loic@dachary.org>
+// SPDX-License-Identifier: MIT
+
+package f3
+
+type Forge struct {
+	Common
+	URL string `json:"url"`
+}
+
+func (o Forge) Equal(other Forge) bool {
+	return o.Common.Equal(other.Common)
+}
+
+func (o *Forge) Clone() Interface {
+	clone := &Forge{}
+	*clone = *o
+	return clone
+}
--- a/f3/formatbase.go
+++ b/f3/formatbase.go
@ -0,0 +1,99 @@
+// Copyright Earl Warren <contact@earl-warren.org>
+// Copyright Loïc Dachary <loic@dachary.org>
+// SPDX-License-Identifier: MIT
+
+package f3
+
+import (
+	"encoding/json"
+	"strings"
+
+	"code.forgejo.org/f3/gof3/v3/util"
+)
+
+type Interface interface {
+	GetID() string
+	GetName() string
+	SetID(id string)
+	IsNil() bool
+	GetReferences() References
+	ToReference() *Reference
+	Clone() Interface
+}
+
+type ReferenceInterface interface {
+	Get() string
+	Set(reference string)
+	GetIDAsString() string
+	GetIDAsInt() int64
+}
+
+type Reference struct {
+	ID string
+}
+
+func (r *Reference) Get() string {
+	return r.ID
+}
+
+func (r *Reference) Set(reference string) {
+	r.ID = reference
+}
+
+func (r *Reference) GetIDAsInt() int64 {
+	return util.ParseInt(r.GetIDAsString())
+}
+
+func (r *Reference) GetIDAsString() string {
+	s := strings.Split(r.ID, "/")
+	return s[len(s)-1]
+}
+
+type References []ReferenceInterface
+
+func (r *Reference) UnmarshalJSON(b []byte) error {
+	return json.Unmarshal(b, &r.ID)
+}
+
+func (r Reference) MarshalJSON() ([]byte, error) {
+	return json.Marshal(r.ID)
+}
+
+func (r *Reference) GetID() string             { return r.ID }
+func (r *Reference) SetID(id string)           { r.ID = id }
+func (r *Reference) IsNil() bool               { return r == nil || r.ID == "0" || r.ID == "" }
+func (r Reference) Equal(other Reference) bool { return r.ID == other.ID }
+
+func NewReferences() References {
+	return make([]ReferenceInterface, 0, 1)
+}
+
+func NewReference(id string) *Reference {
+	r := &Reference{}
+	r.SetID(id)
+	return r
+}
+
+type Common struct {
+	Index Reference `json:"index"`
+}
+
+func (c *Common) GetID() string             { return c.Index.GetID() }
+func (c *Common) GetName() string           { return c.GetID() }
+func (c *Common) SetID(id string)           { c.Index.SetID(id) }
+func (c *Common) IsNil() bool               { return c == nil || c.Index.IsNil() }
+func (c *Common) GetReferences() References { return NewReferences() }
+func (c *Common) ToReference() *Reference   { return &c.Index }
+func (c Common) Equal(other Common) bool    { return true }
+
+var Nil = &Common{}
+
+func NewCommon(id string) Common {
+	return Common{Index: *NewReference(id)}
+}
+
+func (c *Common) Clone() Interface {
+	clone := &Common{}
+	*clone = *c
+	return clone
+}
--- a/f3/formatbase_test.go
+++ b/f3/formatbase_test.go
@ -0,0 +1,57 @@
+// Copyright limiting-factor <limiting-factor@posteo.com>
+// SPDX-License-Identifier: MIT
+
+package f3
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestF3Reference(t *testing.T) {
+	ref := "reference"
+	r := NewReference(ref)
+	assert.Equal(t, ref, r.GetID())
+	otherRef := "other"
+	r.SetID(otherRef)
+	assert.Equal(t, otherRef, r.GetID())
+	r.Set(otherRef)
+	assert.Equal(t, otherRef, r.Get())
+	assert.True(t, r.Equal(*r))
+
+	m, err := r.MarshalJSON()
+	require.NoError(t, err)
+	u := NewReference("???")
+	require.NoError(t, u.UnmarshalJSON(m))
+	assert.True(t, r.Equal(*u))
+
+	assert.False(t, r.IsNil())
+	r.SetID("")
+	assert.True(t, r.IsNil())
+	r.SetID("0")
+	assert.True(t, r.IsNil())
+
+	var nilRef *Reference
+	assert.True(t, nilRef.IsNil())
+}
+
+func TestF3Common(t *testing.T) {
+	id := "ID"
+	c := NewCommon(id)
+	assert.Equal(t, id, c.GetID())
+	assert.Equal(t, id, c.GetName())
+	otherID := "otherID"
+	c.SetID(otherID)
+	assert.Equal(t, otherID, c.GetID())
+
+	assert.False(t, c.IsNil())
+	c.SetID("")
+	assert.True(t, c.IsNil())
+	c.SetID("0")
+	assert.True(t, c.IsNil())
+
+	var nilCommon *Common
+	assert.True(t, nilCommon.IsNil())
+}
--- a/f3/issue.go
+++ b/f3/issue.go
@ -0,0 +1,58 @@
+// Copyright Earl Warren <contact@earl-warren.org>
+// Copyright Loïc Dachary <loic@dachary.org>
+// SPDX-License-Identifier: MIT
+
+package f3
+
+import "time"
+
+const (
+	IssueStateOpen   = "open"
+	IssueStateClosed = "closed"
+)
+
+type Issue struct {
+	Common
+	PosterID  *Reference   `json:"poster_id"`
+	Assignees []*Reference `json:"assignees"`
+	Labels    []*Reference `json:"labels"`
+	Title     string       `json:"title"`
+	Content   string       `json:"content"`
+	Milestone *Reference   `json:"milestone"`
+	State     string       `json:"state"` // open, closed
+	IsLocked  bool         `json:"is_locked"`
+	Created   time.Time    `json:"created"`
+	Updated   time.Time    `json:"updated"`
+	Closed    *time.Time   `json:"closed"`
+}
+
+func (o *Issue) GetReferences() References {
+	references := o.Common.GetReferences()
+	for _, assignee := range o.Assignees {
+		references = append(references, assignee)
+	}
+	for _, label := range o.Labels {
+		references = append(references, label)
+	}
+	if !o.Milestone.IsNil() {
+		references = append(references, o.Milestone)
+	}
+	return append(references, o.PosterID)
+}
+
+func (o Issue) Equal(other Issue) bool {
+	return o.Common.Equal(other.Common) &&
+		nilOrEqual(o.PosterID, other.PosterID) &&
+		arrayEqual(o.Assignees, other.Assignees) &&
+		arrayEqual(o.Labels, other.Labels) &&
+		o.Title == other.Title &&
+		nilOrEqual(o.Milestone, other.Milestone) &&
+		o.State == other.State &&
+		o.IsLocked == other.IsLocked
+}
+
+func (o *Issue) Clone() Interface {
+	clone := &Issue{}
+	*clone = *o
+	return clone
+}
--- a/f3/label.go
+++ b/f3/label.go
@ -0,0 +1,25 @@
+// Copyright Earl Warren <contact@earl-warren.org>
+// Copyright Loïc Dachary <loic@dachary.org>
+// SPDX-License-Identifier: MIT
+
+package f3
+
+type Label struct {
+	Common
+	Name        string `json:"name"`
+	Color       string `json:"color"`
+	Description string `json:"description"`
+}
+
+func (o Label) Equal(other Label) bool {
+	return o.Common.Equal(other.Common) &&
+		o.Name == other.Name &&
+		o.Color == other.Color &&
+		o.Description == other.Description
+}
+
+func (o *Label) Clone() Interface {
+	clone := &Label{}
+	*clone = *o
+	return clone
+}
--- a/f3/milestone.go
+++ b/f3/milestone.go
@ -0,0 +1,37 @@
+// Copyright Earl Warren <contact@earl-warren.org>
+// Copyright Loïc Dachary <loic@dachary.org>
+// SPDX-License-Identifier: MIT
+
+package f3
+
+import "time"
+
+const (
+	MilestoneStateOpen   = "open"
+	MilestoneStateClosed = "closed"
+)
+
+type Milestone struct {
+	Common
+	Title       string     `json:"title"`
+	Description string     `json:"description"`
+	Deadline    *time.Time `json:"deadline"`
+	Created     time.Time  `json:"created"`
+	Updated     *time.Time `json:"updated"`
+	Closed      *time.Time `json:"closed"`
+	State       string     `json:"state"` // open, closed
+}
+
+func (o Milestone) Equal(other Milestone) bool {
+	return o.Common.Equal(other.Common) &&
+		o.Title == other.Title &&
+		o.Description == other.Description &&
+		nilOrEqualTimeToDate(o.Deadline, other.Deadline) &&
+		o.State == other.State
+}
+
+func (o *Milestone) Clone() Interface {
+	clone := &Milestone{}
+	*clone = *o
+	return clone
+}
--- a/f3/new.go
+++ b/f3/new.go
@ -0,0 +1,81 @@
+// Copyright Earl Warren <contact@earl-warren.org>
+// Copyright Loïc Dachary <loic@dachary.org>
+// SPDX-License-Identifier: MIT
+
+package f3
+
+import (
+	"fmt"
+)
+
+func New(name string) Interface {
+	common := NewCommon(name)
+	switch name {
+	case "<root>":
+		return &common
+	case ResourceAsset:
+		return &ReleaseAsset{}
+	case ResourceAssets:
+		return &common
+	case ResourceComment:
+		return &Comment{}
+	case ResourceComments:
+		return &common
+	case ResourceIssue:
+		return &Issue{}
+	case ResourceIssues:
+		return &common
+	case ResourceLabel:
+		return &Label{}
+	case ResourceLabels:
+		return &common
+	case ResourceMilestone:
+		return &Milestone{}
+	case ResourceMilestones:
+		return &common
+	case ResourceOrganization:
+		return &Organization{}
+	case ResourceOrganizations:
+		return &common
+	case ResourceProject:
+		return &Project{}
+	case ResourceProjects:
+		return &common
+	case ResourcePullRequest:
+		return &PullRequest{}
+	case ResourcePullRequests:
+		return &common
+	case ResourceReaction:
+		return &Reaction{}
+	case ResourceReactions:
+		return &common
+	case ResourceRelease:
+		return &Release{}
+	case ResourceReleases:
+		return &common
+	case ResourceRepository:
+		return &Repository{}
+	case ResourceRepositories:
+		return &common
+	case ResourceReview:
+		return &Review{}
+	case ResourceReviews:
+		return &common
+	case ResourceReviewComment:
+		return &ReviewComment{}
+	case ResourceReviewComments:
+		return &common
+	case ResourceTopic:
+		return &Topic{}
+	case ResourceTopics:
+		return &common
+	case ResourceUser:
+		return &User{}
+	case ResourceUsers:
+		return &common
+	case ResourceForge:
+		return &Forge{}
+	default:
+		panic(fmt.Errorf("unknown %s", name))
+	}
+}
--- a/f3/organization.go
+++ b/f3/organization.go
@ -0,0 +1,27 @@
+// Copyright Earl Warren <contact@earl-warren.org>
+// Copyright Loïc Dachary <loic@dachary.org>
+// SPDX-License-Identifier: MIT
+
+package f3
+
+type Organization struct {
+	Common
+	FullName string `json:"full_name"`
+	Name     string `json:"name"`
+}
+
+func (o Organization) Equal(other Organization) bool {
+	return o.Common.Equal(other.Common) &&
+		o.FullName == other.FullName &&
+		o.Name == other.Name
+}
+
+func (o *Organization) GetName() string {
+	return o.Name
+}
+
+func (o *Organization) Clone() Interface {
+	clone := &Organization{}
+	*clone = *o
+	return clone
+}
--- a/f3/project.go
+++ b/f3/project.go
@ -0,0 +1,50 @@
+// Copyright Earl Warren <contact@earl-warren.org>
+// Copyright Loïc Dachary <loic@dachary.org>
+// SPDX-License-Identifier: MIT
+
+package f3
+
+type Project struct {
+	Common
+	Name          string       `json:"name"`
+	IsPrivate     bool         `json:"is_private"`
+	IsMirror      bool         `json:"is_mirror"`
+	Description   string       `json:"description"`
+	DefaultBranch string       `json:"default_branch"`
+	Forked        *Reference   `json:"forked"`
+	HasWiki       bool         `json:"has_wiki"`
+	Topics        []*Reference `json:"topics"`
+}
+
+func (o Project) Project(other Project) bool {
+	return o.Common.Equal(other.Common) &&
+		o.Name == other.Name &&
+		o.IsPrivate == other.IsPrivate &&
+		o.IsMirror == other.IsMirror &&
+		o.Description == other.Description &&
+		o.DefaultBranch == other.DefaultBranch &&
+		nilOrEqual(o.Forked, other.Forked) &&
+		o.HasWiki == other.HasWiki &&
+		arrayEqual(o.Topics, other.Topics)
+}
+
+func (o *Project) GetName() string {
+	return o.Name
+}
+
+func (o *Project) GetReferences() References {
+	references := o.Common.GetReferences()
+	if !o.Forked.IsNil() {
+		references = append(references, o.Forked)
+	}
+	for _, topic := range o.Topics {
+		references = append(references, topic)
+	}
+	return references
+}
+
+func (o *Project) Clone() Interface {
+	clone := &Project{}
+	*clone = *o
+	return clone
+}
--- a/f3/pullrequest.go
+++ b/f3/pullrequest.go
@ -0,0 +1,72 @@
+// Copyright Earl Warren <contact@earl-warren.org>
+// Copyright Loïc Dachary <loic@dachary.org>
+// SPDX-License-Identifier: MIT
+
+package f3
+
+import (
+	"context"
+	"time"
+)
+
+type PullRequestFetchFunc func(ctx context.Context, url, ref string)
+
+const (
+	PullRequestStateOpen   = "open"
+	PullRequestStateClosed = "closed"
+)
+
+type PullRequest struct {
+	Common
+	PosterID       *Reference        `json:"poster_id"`
+	Title          string            `json:"title"`
+	Content        string            `json:"content"`
+	Milestone      *Reference        `json:"milestone"`
+	State          string            `json:"state"` // open, closed
+	IsLocked       bool              `json:"is_locked"`
+	Created        time.Time         `json:"created"`
+	Updated        time.Time         `json:"updated"`
+	Closed         *time.Time        `json:"closed"`
+	Merged         bool              `json:"merged"`
+	MergedTime     *time.Time        `json:"merged_time"`
+	MergeCommitSHA string            `json:"merged_commit_sha"`
+	Head           PullRequestBranch `json:"head"`
+	Base           PullRequestBranch `json:"base"`
+
+	FetchFunc PullRequestFetchFunc `json:"-"`
+}
+
+func (o PullRequest) Equal(other PullRequest) bool {
+	return o.Common.Equal(other.Common) &&
+		nilOrEqual(o.PosterID, other.PosterID) &&
+		o.Title == other.Title &&
+		o.Content == other.Content &&
+		nilOrEqual(o.Milestone, other.Milestone) &&
+		o.State == other.State &&
+		o.IsLocked == other.IsLocked &&
+		o.Merged == other.Merged &&
+		nilOrEqual(o.MergedTime, other.MergedTime) &&
+		o.MergeCommitSHA == other.MergeCommitSHA &&
+		o.Head.Equal(other.Head) &&
+		o.Base.Equal(other.Base)
+}
+
+func (o *PullRequest) GetReferences() References {
+	references := o.Common.GetReferences()
+	if !o.Milestone.IsNil() {
+		references = append(references, o.Milestone)
+	}
+	references = append(references, o.Base.GetReferences()...)
+	references = append(references, o.Head.GetReferences()...)
+	return append(references, o.PosterID)
+}
+
+func (o *PullRequest) IsForkPullRequest() bool {
+	return o.Head.Repository != o.Base.Repository
+}
+
+func (o *PullRequest) Clone() Interface {
+	clone := &PullRequest{}
+	*clone = *o
+	return clone
+}
--- a/f3/pullrequestbranch.go
+++ b/f3/pullrequestbranch.go
@ -0,0 +1,20 @@
+// Copyright Earl Warren <contact@earl-warren.org>
+// Copyright Loïc Dachary <loic@dachary.org>
+// SPDX-License-Identifier: MIT
+
+package f3
+
+type PullRequestBranch struct {
+	Ref        string     `json:"ref"`
+	SHA        string     `json:"sha"`
+	Repository *Reference `json:"repository"`
+}
+
+func (o PullRequestBranch) Equal(other PullRequestBranch) bool {
+	return o.Ref == other.Ref &&
+		o.SHA == other.SHA
+}
+
+func (o *PullRequestBranch) GetReferences() References {
+	return References{o.Repository}
+}
--- a/f3/reaction.go
+++ b/f3/reaction.go
@ -0,0 +1,31 @@
+// Copyright Earl Warren <contact@earl-warren.org>
+// Copyright Loïc Dachary <loic@dachary.org>
+// SPDX-License-Identifier: MIT
+
+package f3
+
+type Reaction struct {
+	Common
+	UserID  *Reference `json:"user_id"`
+	Content string     `json:"content"`
+}
+
+func (o Reaction) Equal(other Reaction) bool {
+	return o.Common.Equal(other.Common) &&
+		nilOrEqual(o.UserID, other.UserID) &&
+		o.Content == other.Content
+}
+
+func (o *Reaction) GetReferences() References {
+	references := o.Common.GetReferences()
+	if !o.UserID.IsNil() {
+		references = append(references, o.UserID)
+	}
+	return references
+}
+
+func (o *Reaction) Clone() Interface {
+	clone := &Reaction{}
+	*clone = *o
+	return clone
+}
--- a/f3/release.go
+++ b/f3/release.go
@ -0,0 +1,48 @@
+// Copyright Earl Warren <contact@earl-warren.org>
+// Copyright Loïc Dachary <loic@dachary.org>
+// SPDX-License-Identifier: MIT
+
+package f3
+
+import (
+	"time"
+)
+
+type Release struct {
+	Common
+	TagName         string          `json:"tag_name"`
+	TargetCommitish string          `json:"target_commitish"`
+	Name            string          `json:"name"`
+	Body            string          `json:"body"`
+	Draft           bool            `json:"draft"`
+	Prerelease      bool            `json:"prerelease"`
+	PublisherID     *Reference      `json:"publisher_id"`
+	Assets          []*ReleaseAsset `json:"assets"`
+	Created         time.Time       `json:"created"`
+}
+
+func (o Release) Equal(other Release) bool {
+	return o.Common.Equal(other.Common) &&
+		o.TagName == other.TagName &&
+		o.TargetCommitish == other.TargetCommitish &&
+		o.Name == other.Name &&
+		o.Body == other.Body &&
+		o.Draft == other.Draft &&
+		o.Prerelease == other.Prerelease &&
+		nilOrEqual(o.PublisherID, other.PublisherID) &&
+		arrayEqual(o.Assets, other.Assets)
+}
+
+func (o *Release) GetReferences() References {
+	references := o.Common.GetReferences()
+	if !o.PublisherID.IsNil() {
+		references = append(references, o.PublisherID)
+	}
+	return references
+}
+
+func (o *Release) Clone() Interface {
+	clone := &Release{}
+	*clone = *o
+	return clone
+}
--- a/f3/releaseasset.go
+++ b/f3/releaseasset.go
@ -0,0 +1,38 @@
+// Copyright Earl Warren <contact@earl-warren.org>
+// Copyright Loïc Dachary <loic@dachary.org>
+// SPDX-License-Identifier: MIT
+
+package f3
+
+import (
+	"io"
+	"time"
+)
+
+type DownloadFuncType func() io.ReadCloser
+
+type ReleaseAsset struct {
+	Common
+	Name          string           `json:"name"`
+	ContentType   string           `json:"content_type"`
+	Size          int64            `json:"size"`
+	DownloadCount int64            `json:"download_count"`
+	Created       time.Time        `json:"created"`
+	SHA256        string           `json:"sha256"`
+	DownloadURL   string           `json:"download_url"`
+	DownloadFunc  DownloadFuncType `json:"-"`
+}
+
+func (o ReleaseAsset) Equal(other ReleaseAsset) bool {
+	return o.Common.Equal(other.Common) &&
+		o.Name == other.Name &&
+		o.ContentType == other.ContentType &&
+		o.Size == other.Size &&
+		o.SHA256 == other.SHA256
+}
+
+func (o *ReleaseAsset) Clone() Interface {
+	clone := &ReleaseAsset{}
+	*clone = *o
+	return clone
+}
--- a/f3/repository.go
+++ b/f3/repository.go
@ -0,0 +1,45 @@
+// Copyright Earl Warren <contact@earl-warren.org>
+// Copyright Loïc Dachary <loic@dachary.org>
+// SPDX-License-Identifier: MIT
+
+package f3
+
+import (
+	"context"
+)
+
+const (
+	RepositoryNameDefault = "vcs"
+	RepositoryNameWiki    = "vcs.wiki"
+)
+
+var nameToID = map[string]int64{
+	RepositoryNameDefault: 1,
+	RepositoryNameWiki:    2,
+}
+
+// var RepositoryNames = []string{RepositoryNameDefault, RepositoryNameWiki}
+
+var RepositoryNames = []string{RepositoryNameDefault}
+
+type Repository struct {
+	Common
+
+	Name      string
+	FetchFunc func(ctx context.Context, destination string, internalRefs []string) `json:"-"`
+}
+
+func (o Repository) Equal(other Repository) bool {
+	return o.Common.Equal(other.Common) &&
+		o.Name == other.Name
+}
+
+func (o *Repository) Clone() Interface {
+	clone := &Repository{}
+	*clone = *o
+	return clone
+}
+
+func RepositoryDirname(name string) string {
+	return "git" + name
+}
--- a/f3/resources.go
+++ b/f3/resources.go
@ -0,0 +1,39 @@
+// Copyright Earl Warren <contact@earl-warren.org>
+// Copyright Loïc Dachary <loic@dachary.org>
+// SPDX-License-Identifier: MIT
+
+package f3
+
+const (
+	ResourceAsset          = "asset"
+	ResourceAssets         = "assets"
+	ResourceComment        = "comment"
+	ResourceComments       = "comments"
+	ResourceIssue          = "issue"
+	ResourceIssues         = "issues"
+	ResourceLabel          = "label"
+	ResourceLabels         = "labels"
+	ResourceMilestone      = "milestone"
+	ResourceMilestones     = "milestones"
+	ResourceOrganization   = "organization"
+	ResourceOrganizations  = "organizations"
+	ResourceProject        = "project"
+	ResourceProjects       = "projects"
+	ResourcePullRequest    = "pull_request"
+	ResourcePullRequests   = "pull_requests"
+	ResourceReaction       = "reaction"
+	ResourceReactions      = "reactions"
+	ResourceRelease        = "release"
+	ResourceReleases       = "releases"
+	ResourceRepository     = "repository"
+	ResourceRepositories   = "repositories"
+	ResourceReview         = "review"
+	ResourceReviews        = "reviews"
+	ResourceReviewComment  = "reviewcomment"
+	ResourceReviewComments = "reviewcomments"
+	ResourceTopic          = "topic"
+	ResourceTopics         = "topics"
+	ResourceUser           = "user"
+	ResourceUsers          = "users"
+	ResourceForge          = "forge"
+)
--- a/f3/review.go
+++ b/f3/review.go
@ -0,0 +1,48 @@
+// Copyright Earl Warren <contact@earl-warren.org>
+// Copyright Loïc Dachary <loic@dachary.org>
+// SPDX-License-Identifier: MIT
+
+package f3
+
+import "time"
+
+const (
+	ReviewStatePending          = "PENDING"
+	ReviewStateApproved         = "APPROVED"
+	ReviewStateChangesRequested = "CHANGES_REQUESTED"
+	ReviewStateCommented        = "COMMENTED"
+	ReviewStateRequestReview    = "REQUEST_REVIEW"
+	ReviewStateUnknown          = ""
+)
+
+type Review struct {
+	Common
+	ReviewerID *Reference `json:"reviewer_id"`
+	Official   bool       `json:"official"`
+	CommitID   string     `json:"commit_id"`
+	Content    string     `json:"content"`
+	CreatedAt  time.Time  `json:"created_at"`
+	State      string     `json:"state"`
+}
+
+func (o Review) Equal(other Review) bool {
+	return o.Common.Equal(other.Common) &&
+		nilOrEqual(o.ReviewerID, other.ReviewerID) &&
+		o.CommitID == other.CommitID &&
+		o.Content == other.Content &&
+		o.State == other.State
+}
+
+func (o *Review) GetReferences() References {
+	references := o.Common.GetReferences()
+	if !o.ReviewerID.IsNil() {
+		references = append(references, o.ReviewerID)
+	}
+	return references
+}
+
+func (o *Review) Clone() Interface {
+	clone := &Review{}
+	*clone = *o
+	return clone
+}
--- a/f3/reviewcomment.go
+++ b/f3/reviewcomment.go
@ -0,0 +1,46 @@
+// Copyright Earl Warren <contact@earl-warren.org>
+// Copyright Loïc Dachary <loic@dachary.org>
+// SPDX-License-Identifier: MIT
+
+package f3
+
+import (
+	"time"
+)
+
+type ReviewComment struct {
+	Common
+	Content    string     `json:"content"`
+	TreePath   string     `json:"tree_path"`
+	DiffHunk   string     `json:"diff_hunk"`
+	Line       int        `json:"line"`
+	LinesCount int        `json:"lines_count"`
+	CommitID   string     `json:"commit_id"`
+	PosterID   *Reference `json:"poster_id"`
+	CreatedAt  time.Time  `json:"created_at"`
+	UpdatedAt  time.Time  `json:"updated_at"`
+}
+
+func (o ReviewComment) Equal(other ReviewComment) bool {
+	return o.Common.Equal(other.Common) &&
+		o.Content == other.Content &&
+		o.TreePath == other.TreePath &&
+		o.Line == other.Line &&
+		o.LinesCount == other.LinesCount &&
+		o.CommitID == other.CommitID &&
+		nilOrEqual(o.PosterID, other.PosterID)
+}
+
+func (o *ReviewComment) GetReferences() References {
+	references := o.Common.GetReferences()
+	if !o.PosterID.IsNil() {
+		references = append(references, o.PosterID)
+	}
+	return references
+}
+
+func (o *ReviewComment) Clone() Interface {
+	clone := &ReviewComment{}
+	*clone = *o
+	return clone
+}
--- a/f3/schemas/ci.json
+++ b/f3/schemas/ci.json
@ -0,0 +1,42 @@
+{
+    "title": "CI",
+    "description": "The Continuous Integration supported by the project. The configuration files are found in the repository itself, under a path that depends on the CI system.",
+
+    "type": "object",
+    "additionalProperties": false,
+    "properties": {
+	"index": {
+	    "description": "The type of continuous integration",
+	    "enum": [
+		"Apache Gump",
+		"Azure DevOps Server",
+		"Bamboo",
+		"Buddy",
+		"Buildbot",
+		"BuildMaster",
+		"CircleCI",
+		"Drone",
+		"Forgejo Actions",
+		"Gitea Actions",
+		"GitHub Actions",
+		"GitLab",
+		"GoCD",
+		"Jenkins",
+		"OpenMake",
+		"Semaphore",
+		"TeamCity",
+		"tekton",
+		"Travis CI",
+		"Vexor",
+		"Woodpecker CI"
+	    ]
+	}
+    },
+    "required": [
+	"index"
+    ],
+
+    "$schema": "http://json-schema.org/draft-04/schema#",
+    "$id": "https://code.forgejo.org/f3/f3-schemas/src/branch/main/ci.json",
+    "$$target": "ci.json"
+}
--- a/f3/schemas/comment.json
+++ b/f3/schemas/comment.json
@ -0,0 +1,49 @@
+{
+    "title": "Comment",
+    "description": "Comment associated to a commentable object (i.e. issue, review, etc.). Forge users add a comment to an object to create a non-threaded conversation.",
+
+    "type": "object",
+    "additionalProperties": false,
+    "properties": {
+	"index": {
+	    "description": "Unique identifier of the comment.",
+	    "type": "string"
+	},
+	"poster_id": {
+	    "description": "Unique identifier of the comment author.",
+	    "type": "string"
+	},
+	"created": {
+	    "description": "Creation time.",
+	    "type": "string",
+	    "format": "date-time"
+	},
+	"updated": {
+	    "description": "Last update time.",
+	    "type": "string",
+	    "format": "date-time"
+	},
+	"content": {
+	    "description": "Markdown content of the comment.",
+	    "type": "string"
+	},
+	"reactions": {
+	    "description": "List of reactions.",
+	    "type": "array",
+	    "items": {
+		"$ref": "reaction.json"
+	    }
+	}
+    },
+    "required": [
+	"index",
+	"poster_id",
+	"created",
+	"updated",
+	"content"
+    ],
+
+    "$schema": "http://json-schema.org/draft-04/schema#",
+    "$id": "https://code.forgejo.org/f3/f3-schemas/src/branch/main/comment.json",
+    "$$target": "comment.json"
+}
--- a/f3/schemas/index.rst
+++ b/f3/schemas/index.rst
@ -0,0 +1,22 @@
+.. toctree::
+   :maxdepth: 2
+
+.. jsonschema:: ci.json
+.. jsonschema:: comment.json
+.. jsonschema:: issue.json
+.. jsonschema:: label.json
+.. jsonschema:: milestone.json
+.. jsonschema:: object.json
+.. jsonschema:: organization.json
+.. jsonschema:: project.json
+.. jsonschema:: pullrequest.json
+.. jsonschema:: pullrequestbranch.json
+.. jsonschema:: reaction.json
+.. jsonschema:: release.json
+.. jsonschema:: releaseasset.json
+.. jsonschema:: repository.json
+.. jsonschema:: review.json
+.. jsonschema:: reviewcomment.json
+.. jsonschema:: topic.json
+.. jsonschema:: user.json
+
--- a/f3/schemas/issue.json
+++ b/f3/schemas/issue.json
@ -0,0 +1,96 @@
+{
+    "title": "Issue",
+    "description": "An issue within an issue tracking system, relative to a project.",
+
+    "type": "object",
+    "additionalProperties": false,
+    "properties": {
+	"index": {
+	    "description": "Unique identifier of the issue.",
+	    "type": "string"
+	},
+	"poster_id": {
+	    "description": "Unique identifier of the user who authored the issue.",
+	    "type": "string"
+	},
+	"title": {
+	    "description": "Short description displayed as the title.",
+	    "type": "string"
+	},
+	"content": {
+	    "description": "Description of the issue.",
+	    "type": "string"
+	},
+	"milestone": {
+	    "description": "Unique identifier of the milestone.",
+	    "type": "string"
+	},
+	"state": {
+	    "description": "An issue is 'closed' when it is resolved, 'open' otherwise. Issues that do not relate to a topic that needs to be resolved, such as an open conversation, may never be closed.",
+	    "enum": [
+		"closed",
+		"open"
+	    ]
+	},
+	"is_locked": {
+	    "description": "A locked issue can only be modified by privileged users. It is commonly used for moderation purposes when comments associated with the issue are too heated.",
+	    "type": "boolean"
+	},
+	"created": {
+	    "description": "Creation time.",
+	    "type": "string",
+	    "format": "date-time"
+	},
+	"updated": {
+	    "description": "Last update time.",
+	    "type": "string",
+	    "format": "date-time"
+	},
+	"closed": {
+	    "description": "The last time 'state' changed to 'closed'.",
+	    "type": "string",
+	    "format": "date-time"
+	},
+	"due": {
+	    "description": "Due date.",
+	    "type": "string",
+	    "format": "date"
+	},
+	"labels": {
+	    "description": "List of label unique identifiers.",
+	    "type": "array",
+	    "items": {
+		"type": "string"
+	    }
+	},
+	"reactions": {
+	    "description": "List of reactions.",
+	    "type": "array",
+	    "items": {
+		"$ref": "reaction.json"
+	    }
+	},
+	"assignees": {
+	    "description": "List of assignees.",
+	    "type": "array",
+	    "items": {
+		"description": "Name of a user assigned to the issue.",
+		"type": "string"
+	    }
+	}
+    },
+    "required": [
+	"index",
+	"poster_id",
+	"title",
+	"content",
+	"state",
+	"is_locked",
+	"created",
+	"updated"
+    ],
+
+    "$schema": "http://json-schema.org/draft-04/schema#",
+    "$id": "https://code.forgejo.org/f3/f3-schemas/src/branch/main/issue.json",
+    "$$target": "issue.json"
+}
--- a/f3/schemas/label.json
+++ b/f3/schemas/label.json
@ -0,0 +1,37 @@
+{
+    "title": "Label",
+    "description": "Label associated to an issue.",
+
+    "type": "object",
+    "additionalProperties": false,
+    "properties": {
+	"index": {
+	    "description": "Unique identifier.",
+	    "type": "string"
+	},
+	"name": {
+	    "description": "Name of the label, unique within the repository.",
+	    "type": "string"
+	},
+	"color": {
+	    "description": "Color code of the label in RGB notation 'xxx' or 'xxxxxx'.",
+	    "type": "string"
+	},
+	"description": {
+	    "description": "Long description.",
+	    "type": "string"
+	},
+	"exclusive": {
+	    "description": "There can only be one label with the prefix found before the first slash (/).",
+	    "type": "boolean"
+	}
+    },
+    "required": [
+	"index",
+	"name"
+    ],
+
+    "$schema": "http://json-schema.org/draft-04/schema#",
+    "$id": "https://code.forgejo.org/f3/f3-schemas/src/branch/main/label.json",
+    "$$target": "label.json"
+}
--- a/f3/schemas/milestone.json
+++ b/f3/schemas/milestone.json
@ -0,0 +1,62 @@
+{
+    "title": "Milestone",
+    "description": "Milestone relative to a project, for the purpose of grouping objects due to a given date (issues, etc.).",
+
+    "type": "object",
+    "additionalProperties": false,
+    "properties": {
+	"index": {
+	    "description": "Unique identifier.",
+	    "type": "string"
+	},
+	"title": {
+	    "description": "Short description.",
+	    "type": "string"
+	},
+	"description": {
+	    "description": "Long description.",
+	    "type": "string"
+	},
+	"deadline": {
+	    "description": "Deadline after which the milestone is overdue.",
+	    "type": "string",
+	    "format": "date-time"
+	},
+	"created": {
+	    "description": "Creation time.",
+	    "type": "string",
+	    "format": "date-time"
+	},
+	"updated": {
+	    "description": "Last update time.",
+	    "type": "string",
+	    "format": "date-time"
+	},
+	"closed": {
+	    "description": "The last time 'state' changed to 'closed'.",
+	    "type": "string",
+	    "format": "date-time"
+	},
+	"state": {
+	    "description": "A 'closed' milestone will not see any activity in the future, otherwise it is 'open'.",
+	    "enum": [
+		"closed",
+		"open"
+	    ]
+	}
+    },
+    "required": [
+	"index",
+	"title",
+	"description",
+	"deadline",
+	"created",
+	"updated",
+	"closed",
+	"state"
+    ],
+
+    "$schema": "http://json-schema.org/draft-04/schema#",
+    "$id": "https://code.forgejo.org/f3/f3-schemas/src/branch/main/milestone.json",
+    "$$target": "milestone.json"
+}
--- a/f3/schemas/object.json
+++ b/f3/schemas/object.json
@ -0,0 +1,35 @@
+{
+    "title": "Object",
+    "description": "Meta information and reference to an opaque content such as an image. The unique identifier is the SHA-256 of the content of the object.",
+
+    "type": "object",
+    "additionalProperties": false,
+    "properties": {
+		"index": {
+			"description": "Unique identifier.",
+			"type": "string"
+		},
+		"mime": {
+			"description": "Mime type of the object.",
+			"type": "string"
+		},
+		"name": {
+			"description": "Human readable file name.",
+			"type": "string"
+		},
+		"description": {
+			"description": "Description.",
+			"type": "string"
+		}
+    },
+    "required": [
+	"index",
+	"mime",
+	"name",
+	"description"
+    ],
+
+    "$schema": "http://json-schema.org/draft-04/schema#",
+    "$id": "https://code.forgejo.org/f3/f3-schemas/src/branch/main/object.json",
+    "$$target": "object.json"
+}
--- a/f3/schemas/organization.json
+++ b/f3/schemas/organization.json
@ -0,0 +1,29 @@
+{
+    "title": "Organization",
+    "description": "A forge organization.",
+
+    "type": "object",
+    "additionalProperties": false,
+    "properties": {
+	"index": {
+	    "description": "Unique identifier of the organization.",
+	    "type": "string"
+	},
+	"name": {
+	    "description": "Unique name of the organization.",
+	    "type": "string"
+	},
+	"full_name": {
+	    "description": "Readable name of the organization.",
+	    "type": "string"
+	}
+    },
+    "required": [
+	"index",
+	"name"
+    ],
+
+    "$schema": "http://json-schema.org/draft-04/schema#",
+    "$id": "https://code.forgejo.org/f3/f3-schemas/src/branch/main/organization.json",
+    "$$target": "organization.json"
+}
--- a/f3/schemas/project.json
+++ b/f3/schemas/project.json
@ -0,0 +1,117 @@
+{
+    "title": "Project",
+    "description": "A software project contains a code repository, an issue tracker, etc.",
+
+    "type": "object",
+    "additionalProperties": false,
+    "properties": {
+	"index": {
+	    "description": "Unique identifier of the project.",
+	    "type": "string"
+	},
+	"name": {
+	    "description": "Name of the project, relative to the owner.",
+	    "type": "string"
+	},
+	"is_private": {
+	    "description": "True if the visibility of the project is not public.",
+	    "type": "boolean"
+	},
+	"is_mirror": {
+	    "description": "True if it is a mirror of a project residing on another forge.",
+	    "type": "boolean"
+	},
+	"description": {
+	    "description": "Long description of the project.",
+	    "type": "string"
+	},
+	"default_branch": {
+	    "description": "Name of the default branch in the code repository.",
+	    "type": "string"
+	},
+	"repositories": {
+	    "type": "array",
+	    "items": {
+		"$ref": "repository.json"
+	    }
+	},
+	"forked": {
+	    "description": "Unique identifier of the project from which this one was forked.",
+	    "type": "string"
+	},
+	"ci": {
+	    "type": "array",
+	    "items": {
+		"$ref": "ci.json"
+	    }
+	},
+	"archived": {
+	    "description": "True if archived and read only.",
+	    "type": "boolean"
+	},
+	"archived_at": {
+	    "description": "Time of archival.",
+	    "type": "string",
+	    "format": "date-time"
+	},
+	"created": {
+	    "description": "Creation time.",
+	    "type": "string",
+	    "format": "date-time"
+	},
+	"updated": {
+	    "description": "Last update time.",
+	    "type": "string",
+	    "format": "date-time"
+	},
+	"url": {
+	    "description": "URL associated with the project, for instance the project home page.",
+	    "type": "string"
+	},
+	"stars": {
+	    "description": "Number of stars.",
+	    "type": "number"
+	},
+	"has_ci": {
+	    "description": "True if CI is enabled.",
+	    "type": "boolean"
+	},
+	"has_issues": {
+	    "description": "True if the issue tracker is enabled.",
+	    "type": "boolean"
+	},
+	"has_packages": {
+	    "description": "True if the software packages are enabled.",
+	    "type": "boolean"
+	},
+	"has_kanban": {
+	    "description": "True if the kanban is enabled.",
+	    "type": "boolean"
+	},
+	"has_pull_requests": {
+	    "description": "True if pull requests are enabled.",
+	    "type": "boolean"
+	},
+	"has_releases": {
+	    "description": "True if releases are enabled.",
+	    "type": "boolean"
+	},
+	"has_wiki": {
+	    "description": "True if the wiki is enabled.",
+	    "type": "boolean"
+	}
+    },
+    "required": [
+	"index",
+	"name",
+	"is_private",
+	"is_mirror",
+	"description",
+	"default_branch",
+	"repositories"
+    ],
+
+    "$schema": "http://json-schema.org/draft-04/schema#",
+    "$id": "https://code.forgejo.org/f3/f3-schemas/src/branch/main/project.json",
+    "$$target": "project.json"
+}
--- a/f3/schemas/pullrequest.json
+++ b/f3/schemas/pullrequest.json
@ -0,0 +1,134 @@
+{
+    "title": "Pull request",
+    "description": "A pull requests to merge a commit from a 'head' that may be another branch in the same repository or a branch in a forked repository.",
+
+    "type": "object",
+    "additionalProperties": false,
+    "properties": {
+	"index": {
+	    "description": "Unique identifier of the pull request.",
+	    "type": "string"
+	},
+	"poster_id": {
+	    "description": "Unique identifier of the user who authored the pull request.",
+	    "type": "string"
+	},
+	"title": {
+	    "description": "Short description displayed as the title.",
+	    "type": "string"
+	},
+	"content": {
+	    "description": "Long description.",
+	    "type": "string"
+	},
+	"milestone": {
+	    "description": "Unique identifier of the milestone.",
+	    "type": "string"
+	},
+	"state": {
+	    "description": "A 'closed' pull request will not see any activity in the future, otherwise it is 'open'.",
+	    "enum": [
+		"closed",
+		"open"
+	    ]
+	},
+	"is_locked": {
+	    "description": "A locked pull request can only be modified by privileged users.",
+	    "type": "boolean"
+	},
+	"created": {
+	    "description": "Creation time.",
+	    "type": "string",
+	    "format": "date-time"
+	},
+	"updated": {
+	    "description": "Last update time.",
+	    "type": "string",
+	    "format": "date-time"
+	},
+	"closed": {
+	    "description": "The last time 'state' changed to 'closed'.",
+	    "type": "string",
+	    "format": "date-time"
+	},
+	"labels": {
+	    "description": "List of labels unique identifiers.",
+	    "type": "array",
+	    "items": {
+		"type": "string"
+	    }
+	},
+	"reactions": {
+	    "description": "List of reactions.",
+	    "type": "array",
+	    "items": {
+		"$ref": "reaction.json"
+	    }
+	},
+	"assignees": {
+	    "description": "List of assignees.",
+	    "type": "array",
+	    "items": {
+		"description": "Name of a user assigned to the issue.",
+		"type": "string"
+	    }
+	},
+	"merged": {
+	    "description": "True if the pull request was merged.",
+	    "type": "boolean"
+	},
+	"merged_time": {
+	    "description": "The time when the pull request was merged.",
+	    "type": "string",
+	    "format": "date-time"
+	},
+	"merged_commit_sha": {
+	    "description": "The SHA of the merge commit.",
+	    "type": "string"
+	},
+	"head": {
+	    "description": "The changes proposed in the pull request.",
+	    "type": "object",
+	    "items": {
+		"$ref": "pullrequestbranch.json"
+	    }
+	},
+	"base": {
+	    "description": "The branch where the pull request changes in the head are to be merged.",
+	    "type": "object",
+	    "items": {
+		"$ref": "pullrequestbranch.json"
+	    }
+	},
+	"merged_by": {
+	    "description": "Unique identifier of the user who merged the pull request.",
+	    "type": "string"
+	},
+	"due": {
+	    "description": "Due date.",
+	    "type": "string",
+	    "format": "date"
+	},
+	"allow_edit": {
+	    "description": "True when the author of the pull request allows pushing new commits to its branch.",
+	    "type": "boolean"
+	}
+    },
+    "required": [
+	"index",
+	"poster_id",
+	"title",
+	"content",
+	"state",
+	"is_locked",
+	"created",
+	"updated",
+	"merged",
+	"head",
+	"base"
+    ],
+
+    "$schema": "http://json-schema.org/draft-04/schema#",
+    "$id": "https://code.forgejo.org/f3/f3-schemas/src/branch/main/pullrequest.json",
+    "$$target": "pullrequest.json"
+}
--- a/f3/schemas/pullrequestbranch.json
+++ b/f3/schemas/pullrequestbranch.json
@ -0,0 +1,30 @@
+{
+    "title": "Pull request reference to a commit",
+    "description": "The location of a commit and the repository where it can be found.",
+
+    "type": "object",
+    "additionalProperties": false,
+    "properties": {
+	"ref": {
+	    "description": "Repository reference of the commit (branch, tag, etc.).",
+	    "type": "string"
+	},
+	"sha": {
+	    "description": "SHA of the commit.",
+	    "type": "string"
+	},
+	"repository": {
+	    "description": "Unique identifier of the repository.",
+	    "type": "string"
+	}
+    },
+    "required": [
+	"ref",
+	"sha",
+	"repository"
+    ],
+
+    "$schema": "http://json-schema.org/draft-04/schema#",
+    "$id": "https://code.forgejo.org/f3/f3-schemas/src/branch/main/pullrequestbranch.json",
+    "$$target": "pullrequestbranch.json"
+}
--- a/f3/schemas/reaction.json
+++ b/f3/schemas/reaction.json
@ -0,0 +1,30 @@
+{
+    "title": "Reaction",
+    "description": "Reaction associated to a comment that is displayed as a single emoji.",
+
+    "type": "object",
+    "additionalProperties": false,
+    "properties": {
+	"index": {
+	    "description": "Unique identifier of the reaction.",
+	    "type": "string"
+	},
+	"user_id": {
+	    "description": "Unique identifier of the user who authored the reaction.",
+	    "type": "string"
+	},
+	"content": {
+	    "description": "Representation of the reaction. The rendering of the reaction depends on the forge displaying it.",
+	    "type": "string"
+	}
+    },
+    "required": [
+	"index",
+	"user_id",
+	"content"
+    ],
+
+    "$schema": "http://json-schema.org/draft-04/schema#",
+    "$id": "https://code.forgejo.org/f3/f3-schemas/src/branch/main/reaction.json",
+    "$$target": "reaction.json"
+}
--- a/f3/schemas/release.json
+++ b/f3/schemas/release.json
@ -0,0 +1,60 @@
+{
+    "title": "Release",
+    "description": "A release is associated with a tag in a repository and contains of a set of files (release assets).",
+
+    "type": "object",
+    "additionalProperties": false,
+    "properties": {
+	"index": {
+	    "description": "Unique identifier of the release.",
+	    "type": "string"
+	},
+	"tag_name": {
+	    "description": "Tag name of the release.",
+	    "type": "string"
+	},
+	"target_commitish": {
+	    "description": "Specifies the commitish value that determines where the tag is created from. Can be any branch or commit SHA. Unused if the tag already exists.",
+	    "type": "string"
+	},
+	"name": {
+	    "description": "The name of the release.",
+	    "type": "string"
+	},
+	"body": {
+	    "description": "Text describing the contents of the release, usually the release notes.",
+	    "type": "string"
+	},
+	"draft": {
+	    "description": "True if the release is a draft.",
+	    "type": "boolean"
+	},
+	"prerelease": {
+	    "description": "True if the release is a pre-release.",
+	    "type": "boolean"
+	},
+	"publisher_id": {
+	    "description": "Unique identifier of the user who authored the release.",
+	    "type": "string"
+	},
+	"created": {
+	    "description": "Creation time.",
+	    "type": "string",
+	    "format": "date-time"
+	}
+    },
+    "required": [
+	"index",
+	"tag_name",
+	"name",
+	"body",
+	"draft",
+	"prerelease",
+	"publisher_id",
+	"created"
+    ],
+
+    "$schema": "http://json-schema.org/draft-04/schema#",
+    "$id": "https://code.forgejo.org/f3/f3-schemas/src/branch/main/release.json",
+    "$$target": "release.json"
+}
--- a/f3/schemas/releaseasset.json
+++ b/f3/schemas/releaseasset.json
@ -0,0 +1,61 @@
+{
+    "title": "Release asset",
+    "description": "A file associated with a release. The content of the file is opaque.",
+
+    "type": "object",
+    "additionalProperties": false,
+    "properties": {
+	"index": {
+	    "description": "Unique identifier of the release asset.",
+	    "type": "string"
+	},
+	"name": {
+	    "description": "The name of the release asset.",
+	    "type": "string"
+	},
+	"content_type": {
+	    "description": "The content type of the release asset (application/zip, etc.).",
+	    "type": "string"
+	},
+	"size": {
+	    "description": "Size in bytes of the release asset.",
+	    "type": "number"
+	},
+	"download_count": {
+	    "description": "The number of times the release asset was downloaded.",
+	    "type": "number"
+	},
+	"download_url": {
+	    "description": "The URL from which the release asset can be downloaded.",
+	    "type": "string"
+	},
+	"created": {
+	    "description": "Creation time.",
+	    "type": "string",
+	    "format": "date-time"
+	},
+	"updated": {
+	    "description": "Last update time.",
+	    "type": "string",
+	    "format": "date-time"
+	},
+	"sha256": {
+	    "description": "SHA256 of the cnotent of the asset.",
+	    "type": "string"
+	}
+    },
+    "required": [
+	"index",
+	"name",
+	"content_type",
+	"size",
+	"download_count",
+	"created",
+	"updated",
+	"sha256"
+    ],
+
+    "$schema": "http://json-schema.org/draft-04/schema#",
+    "$id": "https://code.forgejo.org/f3/f3-schemas/src/branch/main/releaseasset.json",
+    "$$target": "releaseasset.json"
+}
--- a/f3/schemas/repository.json
+++ b/f3/schemas/repository.json
@ -0,0 +1,31 @@
+{
+    "title": "Repository",
+    "description": "VCS repository relative to a project. The actual content of the repository is found in the sibling 'repository' directory.",
+
+    "type": "object",
+    "additionalProperties": false,
+    "properties": {
+	"name": {
+	    "description": "Unique name of the repository relative to the project (e.g. vcs or vcs.wiki).",
+	    "type": "string"
+	},
+	"vcs": {
+	    "description": "The type of the repository, defaults to 'git'",
+	    "enum": [
+		"git",
+		"hg",
+		"bazaar",
+		"darcs",
+		"fossil",
+		"svn"
+	    ]
+	}
+    },
+    "required": [
+	"name"
+    ],
+
+    "$schema": "http://json-schema.org/draft-04/schema#",
+    "$id": "https://code.forgejo.org/f3/f3-schemas/src/branch/main/repository.json",
+    "$$target": "repository.json"
+}
--- a/f3/schemas/review.json
+++ b/f3/schemas/review.json
@ -0,0 +1,63 @@
+{
+    "title": "Review",
+    "description": "A set of review comments on a pull/merge request.",
+
+    "type": "object",
+    "additionalProperties": false,
+    "properties": {
+	"index": {
+	    "description": "Unique identifier of the review.",
+	    "type": "string"
+	},
+	"reviewer_id": {
+	    "description": "Unique identifier of review author.",
+	    "type": "string"
+	},
+	"official": {
+	    "description": "True if a positive review counts to reach the required threshold.",
+	    "type": "boolean"
+	},
+	"commit_id": {
+	    "description": "SHA of the commit targeted by the review.",
+	    "type": "string"
+	},
+	"content": {
+	    "description": "Cover message of the review.",
+	    "type": "string"
+	},
+	"created_at": {
+	    "description": "Creation time.",
+	    "type": "string",
+	    "format": "date-time"
+	},
+	"state": {
+	    "description": "State of the review.",
+	    "enum": [
+		"PENDING",
+		"APPROVED",
+		"CHANGES_REQUESTED",
+		"COMMENTED"
+	    ]
+	},
+	"dissmissed": {
+	    "description": "True if the review was dismissed.",
+	    "type": "boolean"
+	},
+	"stale": {
+	    "description": "True if the review is stale because the pull request content changed after it was published.",
+	    "type": "boolean"
+	}
+    },
+    "required": [
+	"index",
+	"reviewer_id",
+	"commit_id",
+	"content",
+	"created_at",
+	"state"
+    ],
+
+    "$schema": "http://json-schema.org/draft-04/schema#",
+    "$id": "https://code.forgejo.org/f3/f3-schemas/src/branch/main/review.json",
+    "$$target": "review.json"
+}
--- a/f3/schemas/reviewcomment.json
+++ b/f3/schemas/reviewcomment.json
@ -0,0 +1,77 @@
+{
+    "title": "Review comment",
+    "description": "A comment in the context of a review.",
+
+    "type": "object",
+    "additionalProperties": false,
+    "properties": {
+	"index": {
+	    "description": "Unique identifier of the review comment.",
+	    "type": "string"
+	},
+	"content": {
+	    "description": "The text of the review comment.",
+	    "type": "string"
+	},
+	"tree_path": {
+	    "description": "The relative path to the file commented on.",
+	    "type": "string"
+	},
+	"diff_hunk": {
+	    "description": "The hunk commented on.",
+	    "type": "string"
+	},
+	"line": {
+	    "description": "The line number of the comment relative to the tree_path.",
+	    "type": "number"
+	},
+	"lines_count": {
+	    "description": "The range of lines that are commented on. If absent it defaults to one and is a single line comment. If specified it must be a positive number. If line is N and lines_count is C, the range of lines commented on is ]N-C,N]. In other words, the range starts lines_count before line, which is the last of the range",
+	    "type": "number"
+	},
+	"commit_id": {
+	    "description": "The SHA of the tree_path commented on.",
+	    "type": "string"
+	},
+	"poster_id": {
+	    "description": "Unique identifier of the user who authored the comment.",
+	    "type": "string"
+	},
+	"reactions": {
+	    "description": "List of reactions.",
+	    "type": "array",
+	    "items": {
+		"$ref": "reaction.json"
+	    }
+	},
+	"created_at": {
+	    "description": "Creation time.",
+	    "type": "string",
+	    "format": "date-time"
+	},
+	"updated_at": {
+	    "description": "Last update time.",
+	    "type": "string",
+	    "format": "date-time"
+	},
+	"resolver": {
+	    "description": "Unique identifier of the user who resolved the comment.",
+	    "type": "string"
+	}
+    },
+    "required": [
+	"index",
+	"content",
+	"tree_path",
+	"diff_hunk",
+	"line",
+	"commit_id",
+	"poster_id",
+	"created_at",
+	"updated_at"
+    ],
+
+    "$schema": "http://json-schema.org/draft-04/schema#",
+    "$id": "https://code.forgejo.org/f3/f3-schemas/src/branch/main/reviewcomment.json",
+    "$$target": "reviewcomment.json"
+}
--- a/f3/schemas/topic.json
+++ b/f3/schemas/topic.json
@ -0,0 +1,25 @@
+{
+    "title": "Topic",
+    "description": "A category associated with a project. There can be multiple topics/categories for a given project.",
+
+    "type": "object",
+    "additionalProperties": false,
+    "properties": {
+        "index": {
+            "description": "Unique identifier.",
+            "type": "string"
+        },
+        "name": {
+            "description": "The name of the category the project belongs to.",
+            "type": "string"
+        }
+    },
+    "required": [
+	"index",
+	"name"
+    ],
+
+    "$schema": "http://json-schema.org/draft-04/schema#",
+    "$id": "https://code.forgejo.org/f3/f3-schemas/src/branch/main/topic.json",
+    "$$target": "topic.json"
+}
--- a/f3/schemas/user.json
+++ b/f3/schemas/user.json
@ -0,0 +1,42 @@
+{
+    "title": "User",
+    "description": "A forge user.",
+
+    "type": "object",
+    "additionalProperties": false,
+    "properties": {
+	"index": {
+	    "description": "Unique identifier of the user.",
+	    "type": "string"
+	},
+	"name": {
+	    "description": "User readable name of the user.",
+	    "type": "string"
+	},
+	"email": {
+	    "description": "Mail of the user.",
+	    "type": "string"
+	},
+	"username": {
+	    "description": "Unique name of the user.",
+	    "type": "string"
+	},
+	"password": {
+	    "description": "Password of the user.",
+	    "type": "string"
+	},
+	"admin": {
+	    "description": "True if the user has administrative permissions on the forge.",
+	    "type": "boolean"
+	}
+    },
+    "required": [
+	"index",
+	"name",
+	"username"
+    ],
+
+    "$schema": "http://json-schema.org/draft-04/schema#",
+    "$id": "https://code.forgejo.org/f3/f3-schemas/src/branch/main/user.json",
+    "$$target": "user.json"
+}
--- a/f3/topic.go
+++ b/f3/topic.go
@ -0,0 +1,21 @@
+// Copyright Earl Warren <contact@earl-warren.org>
+// Copyright Loïc Dachary <loic@dachary.org>
+// SPDX-License-Identifier: MIT
+
+package f3
+
+type Topic struct {
+	Common
+	Name string `json:"name"`
+}
+
+func (o Topic) Equal(other Topic) bool {
+	return o.Common.Equal(other.Common) &&
+		o.Name == other.Name
+}
+
+func (o *Topic) Clone() Interface {
+	clone := &Topic{}
+	*clone = *o
+	return clone
+}
--- a/f3/user.go
+++ b/f3/user.go
@ -0,0 +1,32 @@
+// Copyright Earl Warren <contact@earl-warren.org>
+// Copyright Loïc Dachary <loic@dachary.org>
+// SPDX-License-Identifier: MIT
+
+package f3
+
+type User struct {
+	Common
+	Name     string `json:"name"`
+	Email    string `json:"email"`
+	UserName string `json:"username"`
+	Password string `json:"password"`
+	IsAdmin  bool   `json:"admin"`
+}
+
+func (o User) Equal(other User) bool {
+	return o.Common.Equal(other.Common) &&
+		o.Name == other.Name &&
+		o.Email == other.Email &&
+		o.UserName == other.UserName &&
+		o.IsAdmin == other.IsAdmin
+}
+
+func (o *User) GetName() string {
+	return o.UserName
+}
+
+func (o *User) Clone() Interface {
+	clone := &User{}
+	*clone = *o
+	return clone
+}
--- a/forges/filesystem/asset.go
+++ b/forges/filesystem/asset.go
@ -0,0 +1,85 @@
+// Copyright Earl Warren <contact@earl-warren.org>
+// Copyright Loïc Dachary <loic@dachary.org>
+// SPDX-License-Identifier: MIT
+
+package filesystem
+
+import (
+	"context"
+	"io"
+	"os"
+	"path/filepath"
+
+	"code.forgejo.org/f3/gof3/v3/f3"
+	"code.forgejo.org/f3/gof3/v3/id"
+	"code.forgejo.org/f3/gof3/v3/tree/generic"
+)
+
+type assetDriver struct {
+	nodeDriver
+}
+
+func newAssetDriver(content f3.Interface) generic.NodeDriverInterface {
+	n := newNodeDriver(content).(*nodeDriver)
+	a := &assetDriver{
+		nodeDriver: *n,
+	}
+	return a
+}
+
+func (o *assetDriver) getPath() string {
+	f := o.nodeDriver.content.(*f3.ReleaseAsset)
+	options := o.GetTreeDriver().(*treeDriver).options
+	return filepath.Join(options.Directory, "objects", f.SHA256[0:2], f.SHA256[2:4], f.SHA256)
+}
+
+func (o *assetDriver) save(ctx context.Context) {
+	assetFormat := o.nodeDriver.content.(*f3.ReleaseAsset)
+	objectsHelper := o.getF3Tree().GetObjectsHelper()
+	sha, tmpPath := objectsHelper.Save(assetFormat.DownloadFunc())
+	assetFormat.SHA256 = sha
+	path := o.getPath()
+	if err := os.MkdirAll(filepath.Dir(path), 0o755); err != nil {
+		panic(err)
+	}
+	if err := os.Rename(tmpPath, path); err != nil {
+		panic(err)
+	}
+	o.GetNode().Trace("%s %s", assetFormat.SHA256, path)
+}
+
+func (o *assetDriver) setDownloadFunc() {
+	f := o.nodeDriver.content.(*f3.ReleaseAsset)
+	f.DownloadFunc = func() io.ReadCloser {
+		f, err := os.Open(o.getPath())
+		if err != nil {
+			panic(err)
+		}
+		return f
+	}
+}
+
+func (o *assetDriver) Put(ctx context.Context) id.NodeID {
+	return o.upsert(ctx)
+}
+
+func (o *assetDriver) Patch(ctx context.Context) {
+	o.upsert(ctx)
+}
+
+func (o *assetDriver) upsert(ctx context.Context) id.NodeID {
+	assetFormat := o.nodeDriver.content.(*f3.ReleaseAsset)
+	if assetFormat.SHA256 != "" {
+		o.save(ctx)
+	}
+	o.setDownloadFunc()
+	return o.nodeDriver.upsert(ctx)
+}
+
+func (o *assetDriver) Get(ctx context.Context) bool {
+	if o.nodeDriver.Get(ctx) {
+		o.setDownloadFunc()
+		return true
+	}
+	return false
+}
--- a/forges/filesystem/json.go
+++ b/forges/filesystem/json.go
@ -0,0 +1,37 @@
+// Copyright Earl Warren <contact@earl-warren.org>
+// Copyright Loïc Dachary <loic@dachary.org>
+// SPDX-License-Identifier: MIT
+
+package filesystem
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+)
+
+func loadJSON(filename string, data any) {
+	bs, err := os.ReadFile(filename)
+	if err != nil {
+		panic(fmt.Errorf("ReadFile %w", err))
+	}
+
+	if err := json.Unmarshal(bs, data); err != nil {
+		panic(fmt.Errorf("Unmarshal %s %s %w", filename, string(bs), err))
+	}
+}
+
+func saveJSON(filename string, data any) {
+	f, err := os.Create(filename)
+	if err != nil {
+		panic(fmt.Errorf("Create %w", err))
+	}
+	defer f.Close()
+	bs, err := json.MarshalIndent(data, "", "    ")
+	if err != nil {
+		panic(fmt.Errorf("MarshalIndent %w", err))
+	}
+	if _, err := f.Write(bs); err != nil {
+		panic(fmt.Errorf("Write %w", err))
+	}
+}
--- a/forges/filesystem/main.go
+++ b/forges/filesystem/main.go
@ -0,0 +1,16 @@
+// Copyright Earl Warren <contact@earl-warren.org>
+// Copyright Loïc Dachary <loic@dachary.org>
+// SPDX-License-Identifier: MIT
+
+package filesystem
+
+import (
+	filesystem_options "code.forgejo.org/f3/gof3/v3/forges/filesystem/options"
+	"code.forgejo.org/f3/gof3/v3/options"
+	f3_tree "code.forgejo.org/f3/gof3/v3/tree/f3"
+)
+
+func init() {
+	f3_tree.RegisterForgeFactory(filesystem_options.Name, newTreeDriver)
+	options.RegisterFactory(filesystem_options.Name, newOptions)
+}
--- a/forges/filesystem/node.go
+++ b/forges/filesystem/node.go
@ -0,0 +1,249 @@
+// Copyright Earl Warren <contact@earl-warren.org>
+// Copyright Loïc Dachary <loic@dachary.org>
+// SPDX-License-Identifier: MIT
+
+package filesystem
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"code.forgejo.org/f3/gof3/v3/f3"
+	"code.forgejo.org/f3/gof3/v3/id"
+	"code.forgejo.org/f3/gof3/v3/kind"
+	f3_tree "code.forgejo.org/f3/gof3/v3/tree/f3"
+	"code.forgejo.org/f3/gof3/v3/tree/generic"
+	"code.forgejo.org/f3/gof3/v3/util"
+)
+
+type nodeDriver struct {
+	generic.NullDriver
+
+	content f3.Interface
+}
+
+func newNodeDriver(content f3.Interface) generic.NodeDriverInterface {
+	return &nodeDriver{
+		content: content.Clone(),
+	}
+}
+
+func (o *nodeDriver) SetNative(any) {}
+
+func (o *nodeDriver) GetNativeID() string {
+	return o.GetNode().GetID().String()
+}
+
+func (o *nodeDriver) getBasePath() string {
+	options := o.GetTreeDriver().(*treeDriver).options
+	return options.Directory + o.GetNode().GetCurrentPath().String()
+}
+
+func (o *nodeDriver) getTree() generic.TreeInterface {
+	return o.GetNode().GetTree()
+}
+
+func (o *nodeDriver) getF3Tree() f3_tree.TreeInterface {
+	return o.getTree().(f3_tree.TreeInterface)
+}
+
+func (o *nodeDriver) isContainer() bool {
+	return o.getF3Tree().IsContainer(o.getKind())
+}
+
+func (o *nodeDriver) getKind() kind.Kind {
+	return o.GetNode().GetKind()
+}
+
+func (o *nodeDriver) IsNull() bool { return false }
+
+func (o *nodeDriver) GetIDFromName(ctx context.Context, name string) id.NodeID {
+	switch o.getKind() {
+	case kind.KindRoot, f3_tree.KindProjects, f3_tree.KindUsers, f3_tree.KindOrganizations, f3_tree.KindRepositories:
+	default:
+		panic(fmt.Errorf("unxpected kind %s", o.getKind()))
+	}
+	for _, child := range o.GetNode().List(ctx) {
+		child.Get(ctx)
+		if child.ToFormat().GetName() == name {
+			return child.GetID()
+		}
+	}
+	return id.NilID
+}
+
+func (o *nodeDriver) ListPage(ctx context.Context, page int) generic.ChildrenSlice {
+	node := o.GetNode()
+	node.Trace("%s '%s'", o.getKind(), node.GetID())
+	children := generic.NewChildrenSlice(0)
+
+	if o.getKind() == kind.KindRoot || page > 1 {
+		return children
+	}
+	basePath := o.getBasePath()
+	if !util.FileExists(basePath) {
+		return children
+	}
+
+	f3Tree := o.getF3Tree()
+	if !f3Tree.IsContainer(o.getKind()) {
+		return children
+	}
+
+	node.Trace("%d '%s'", page, basePath)
+
+	dirEntries, err := os.ReadDir(basePath)
+	if err != nil {
+		panic(fmt.Errorf("ReadDir %s %w", basePath, err))
+	}
+
+	for _, dirEntry := range dirEntries {
+		if !strings.HasSuffix(dirEntry.Name(), ".json") {
+			continue
+		}
+		node.Trace("  add %s", dirEntry.Name())
+		child := node.CreateChild(ctx)
+		i := strings.TrimSuffix(dirEntry.Name(), ".json")
+		childID := id.NewNodeID(i)
+		child.SetID(childID)
+		children = append(children, child)
+	}
+
+	return children
+}
+
+func (o *nodeDriver) Equals(context.Context, generic.NodeInterface) bool { panic("") }
+
+func (o *nodeDriver) LookupMappedID(id id.NodeID) id.NodeID {
+	o.GetNode().Trace("%s", id)
+	return id
+}
+
+func (o *nodeDriver) hasJSON() bool {
+	kind := o.getKind()
+	if kind == f3_tree.KindForge {
+		return true
+	}
+	return !o.isContainer()
+}
+
+func (o *nodeDriver) Get(context.Context) bool {
+	o.GetNode().Trace("'%s' '%s'", o.getKind(), o.GetNode().GetID())
+	if !o.hasJSON() || o.GetNode().GetID() == id.NilID {
+		return true
+	}
+	filename := o.getBasePath() + ".json"
+	o.GetNode().Trace("'%s'", filename)
+	if !util.FileExists(filename) {
+		return false
+	}
+	f := o.NewFormat()
+	loadJSON(filename, f)
+	o.content = f
+	o.GetNode().Trace("%s %s id=%s", o.getKind(), filename, o.content.GetID())
+
+	idFilename := o.getBasePath() + ".id"
+	if !util.FileExists(idFilename) {
+		return true
+	}
+	mappedID, err := os.ReadFile(idFilename)
+	if err != nil {
+		panic(fmt.Errorf("Get %s %w", idFilename, err))
+	}
+	o.NullDriver.SetMappedID(id.NewNodeID(string(mappedID)))
+	return true
+}
+
+func (o *nodeDriver) SetMappedID(mapped id.NodeID) {
+	o.NullDriver.SetMappedID(mapped)
+	o.saveMappedID()
+}
+
+func (o *nodeDriver) saveMappedID() {
+	k := o.getKind()
+	switch k {
+	case kind.KindRoot, f3_tree.KindForge:
+		return
+	}
+	if o.isContainer() {
+		return
+	}
+	mappedID := o.GetMappedID()
+	if mappedID == id.NilID {
+		return
+	}
+	basePath := o.getBasePath()
+	idFilename := basePath + ".id"
+	o.Trace("%s", idFilename)
+	if err := os.WriteFile(idFilename, []byte(o.GetMappedID().String()), 0o644); err != nil {
+		panic(fmt.Errorf("%s %w", idFilename, err))
+	}
+}
+
+func (o *nodeDriver) Put(ctx context.Context) id.NodeID {
+	return o.upsert(ctx)
+}
+
+func (o *nodeDriver) Patch(ctx context.Context) {
+	o.upsert(ctx)
+}
+
+func (o *nodeDriver) upsert(context.Context) id.NodeID {
+	i := o.GetNode().GetID()
+	o.GetNode().Trace("%s %s", o.getKind(), i)
+	o.content.SetID(i.String())
+	if !o.hasJSON() || i == id.NilID {
+		return i
+	}
+	basePath := o.getBasePath()
+	dirname := filepath.Dir(basePath)
+	if !util.FileExists(dirname) {
+		if err := os.MkdirAll(dirname, 0o777); err != nil {
+			panic(fmt.Errorf("MakeDirAll %s %w", dirname, err))
+		}
+	}
+	saveJSON(basePath+".json", o.content)
+	o.saveMappedID()
+	return i
+}
+
+func (o *nodeDriver) Delete(context.Context) {
+	if o.isContainer() {
+		return
+	}
+	basePath := o.getBasePath()
+	if util.FileExists(basePath) {
+		if err := os.RemoveAll(basePath); err != nil {
+			panic(fmt.Errorf("RemoveAll %s %w", basePath, err))
+		}
+	}
+
+	for _, ext := range []string{".id", ".json"} {
+		jsonFilename := basePath + ext
+		if util.FileExists(jsonFilename) {
+			if err := os.Remove(jsonFilename); err != nil {
+				panic(fmt.Errorf("RemoveAll %s %w", basePath, err))
+			}
+		}
+	}
+	o.content = o.NewFormat()
+}
+
+func (o *nodeDriver) NewFormat() f3.Interface {
+	return o.getTree().(f3_tree.TreeInterface).NewFormat(o.getKind())
+}
+
+func (o *nodeDriver) FromFormat(content f3.Interface) {
+	o.content = content
+}
+
+func (o *nodeDriver) ToFormat() f3.Interface {
+	return o.content.Clone()
+}
+
+func (o *nodeDriver) String() string {
+	return o.content.GetID()
+}
--- a/forges/filesystem/options.go
+++ b/forges/filesystem/options.go
@ -0,0 +1,16 @@
+// Copyright Earl Warren <contact@earl-warren.org>
+// Copyright Loïc Dachary <loic@dachary.org>
+// SPDX-License-Identifier: MIT
+
+package filesystem
+
+import (
+	filesystem_options "code.forgejo.org/f3/gof3/v3/forges/filesystem/options"
+	"code.forgejo.org/f3/gof3/v3/options"
+)
+
+func newOptions() options.Interface {
+	o := &filesystem_options.Options{}
+	o.SetName(filesystem_options.Name)
+	return o
+}
--- a/Show more
+++ b/Show more