Adding alternative handling for /usr/bin/lzip.

Signed-off-by: Daniel Baumann <daniel@debian.org>

debian/control

@@ -9,6 +9,7 @@ Homepage: http://www.nongnu.org/lzip/pdlzip.html
 Package: pdlzip
 Architecture: any
 Depends: ${misc:Depends}, ${shlibs:Depends}
+Breaks: lzip (<< 1.15~)
 Description: data compressor based on the LZMA algorithm (simple version)
  Lzip is a lossless data compressor based on the LZMA algorithm, with very safe
  integrity checking and a user interface similar to the one of gzip or bzip2.

debian/pdlzip.postinst

@@ -0,0 +1,24 @@
+#!/bin/sh
+
+set -e
+
+case "${1}" in
+	configure)
+		update-alternatives --quiet \
+			--install /usr/bin/lzip lzip /usr/bin/lzip.public-domain 20 \
+			--slave /usr/share/man/man1/lzip.1.gz lzip.1.gz /usr/share/man/man1/lzip.public-domain.1.gz
+		;;
+
+	abort-upgrade|abort-remove|abort-deconfigure)
+
+		;;
+
+	*)
+		echo "postinst called with unknown argument \`${1}'" >&2
+		exit 1
+		;;
+esac
+
+#DEBHELPER#
+
+exit 0

debian/pdlzip.prerm

@@ -0,0 +1,22 @@
+#!/bin/sh
+
+set -e
+
+case "${1}" in
+	remove|upgrade|deconfigure)
+		update-alternatives --quiet --remove lzip /usr/bin/lzip.public-domain
+		;;
+
+	failed-upgrade)
+
+		;;
+
+	*)
+		echo "prerm called with unknown argument \`${1}'" >&2
+		exit 1
+		;;
+esac
+
+#DEBHELPER#
+
+exit 0

debian/rules

@@ -6,8 +6,15 @@
 override_dh_auto_install:
 	dh_auto_install -- DESTDIR=$(CURDIR)/debian/pdlzip
 
-override_dh_strip:
-	dh_strip --dbg-package=pdlzip-dbg
+	# alernative handling
+	mv debian/pdlzip/usr/bin/pdlzip debian/pdlzip/usr/bin/lzip.public-domain
+	mv debian/pdlzip/usr/share/man/man1/pdlzip.1 debian/pdlzip/usr/share/man/man1/lzip.public-domain.1
+
+	ln -s /usr/bin/lzip.public-domain debian/pdlzip/usr/bin/pdlzip
+	ln -s /usr/share/man/man1/lzip.public-domain.1.gz debian/pdlzip/usr/share/man/man1/pdlzip.1.gz
 
 override_dh_builddeb:
 	dh_builddeb -- -Zxz
+
+override_dh_strip:
+	dh_strip --dbg-package=pdlzip-dbg