From 38b90453bc26e73b827104219f1cfd014ea5f6ca Mon Sep 17 00:00:00 2001
From: Rob Austein <sra@hactrn.net>
Date: Sun, 17 Jun 2018 02:34:29 -0400
Subject: Packaging voodoo to support same code version on multiple releases.

reprepro strictly follows the Debian package rule that two package
files which have the same name must have identical content.  Which is
fine, except when we want to support the same version of a package on
multiple releases of the same Debian-flavored operating system.

The usual hack for this is to add a release-specific tag to the end of
the version string.  The brute force way of doing this requires
modifying the source package for each release, but there's an obscure
hack which lets us augment the binary package versions directly.
---
 Makefile            | 15 ++++++++++++---
 source/debian/rules | 17 +++++++++++++++++
 2 files changed, 29 insertions(+), 3 deletions(-)

diff --git a/Makefile b/Makefile
index 131df63..ccc61fd 100644
--- a/Makefile
+++ b/Makefile
@@ -102,6 +102,12 @@ ${TAMPER}: tamper
 tamper:
 	${MAKE} -C $(dir ${TAMPER})
 
+# For extra credit, figure out how to put the right path names into
+# the initial source tarball so we don't need to mess with it in the loop.
+#
+# For more extra credit, figure out how to do the pbuilder stuff as
+# GNU make $(eval) rules rather than as a shell for loop.  Maybe.
+
 dsc:
 	rm -f source/debian/changelog ${PACKAGE_NAME}_*.dsc ${PACKAGE_NAME}_*.tar.xz ${PACKAGE_NAME}_*_source.build ${PACKAGE_NAME}_*_source.changes
 	cd source; ../scripts/build-debian-control-files.py --debemail='${GPG_USER}' --package='${PACKAGE_NAME}' --newversion='${PACKAGE_VERSION}' --conflicts='${PACKAGE_CONFLICT}'
@@ -110,14 +116,17 @@ dsc:
 pbuilder:
 	rm -f ${PBUILDER_BASE}/*result/*
 	touch -d 'last week' .pbuilder-sell-by-date
-	umask ${REPO_UMASK}; \
+	set -x; umask ${REPO_UMASK}; \
 	for target in ${PBUILDER_TARGETS}; do echo $$target | tr '/' ' '; done | \
 	while read dist code arch; do \
-		reprepro -b ${REPO_BASE}/apt/$$dist -A $$arch list $$code ${PACKAGE_NAME} | awk '{v = $$3} END {exit v != "${PACKAGE_VERSION}"}' && continue; \
+		reprepro -b ${REPO_BASE}/apt/$$dist -A $$arch list $$code ${PACKAGE_NAME} | awk -v "c=$$code" '{v = $$3} END {exit v != "${PACKAGE_VERSION}~" c}' && continue; \
 		if test $${HOME}/pbuilder/$${code}-$${arch}-base.tgz -ot .pbuilder-sell-by-date; then pbuilder-dist $$code $$arch update; else true; fi; \
 		pbuilder-dist $$code $$arch build ${PACKAGE_NAME}_${PACKAGE_VERSION}.dsc; \
+		test -f ${REPO_BASE}/brew/tarballs/${PACKAGE_NAME}_${PACKAGE_VERSION}.tar.xz || \
 		cp -p ${PBUILDER_BASE}/$${code}-$${arch}_result/${PACKAGE_NAME}_${PACKAGE_VERSION}.tar.xz ${REPO_BASE}/brew/tarballs/; \
-		reprepro -b ${REPO_BASE}/apt/$$dist include $$code ${PBUILDER_BASE}/$${code}-$${arch}_result/${PACKAGE_NAME}_${PACKAGE_VERSION}_$${arch}.changes; \
+		reprepro -b ${REPO_BASE}/apt/$$dist -T dsc list $$code ${PACKAGE_NAME} | awk '{v = $$3} END {exit v != "${PACKAGE_VERSION}"}' || \
+		reprepro -b ${REPO_BASE}/apt/$$dist includedsc $$code ${PBUILDER_BASE}/$${code}-$${arch}_result/${PACKAGE_NAME}_${PACKAGE_VERSION}.dsc; \
+		reprepro -b ${REPO_BASE}/apt/$$dist includedeb $$code ${PBUILDER_BASE}/$${code}-$${arch}_result/${PACKAGE_NAME}_${PACKAGE_VERSION}~$${code}_$${arch}.deb; \
 	done
 
 homebrew:
diff --git a/source/debian/rules b/source/debian/rules
index 88d6c5a..a0c3a65 100755
--- a/source/debian/rules
+++ b/source/debian/rules
@@ -16,6 +16,23 @@ export DEB_LDFLAGS_MAINT_APPEND = -Wl,--as-needed
 # see EXAMPLES in dpkg-buildflags(1) and read /usr/share/dpkg/*
 DPKG_EXPORT_BUILDFLAGS = 1
 include /usr/share/dpkg/default.mk
+include /usr/share/dpkg/pkg-info.mk
 
 %:
 	dh $@ --with python2
+
+# Distinct binary package versions for a single source package built
+# on multiple releases, to keep reprepro happy.  See:
+#
+#   https://unix.stackexchange.com/questions/31584/two-differently-versioned-binary-debian-packages-from-one-source#32377
+#   https://salsa.debian.org/android-tools-team/android-sdk-meta/blob/master/debian/rules
+#
+# This relies on pbuilder-dist setting the DIST environment variable.
+# Without that, we fall back to the default behavior.
+
+ifneq (,${DIST})
+
+override_dh_gencontrol:
+	dh_gencontrol -- -v${DEB_VERSION}~${DIST}
+
+endif
-- 
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