UBUNTU: [Packaging] startnewrelease: Add support for backport versioning

Ignore: yes

Use the parent kernel version as base for the new release version if
the BACKPORT_SUFFIX variable is set in the update.conf file.
Signed-off-by: Marcelo Henrique Cerri <marcelo.cerri@canonical.com>
Acked-by: Stefan Bader <stefan.bader@canonical.com>
Acked-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

debian/rules.d/1-maintainer.mk

@@ -125,10 +125,20 @@ diffupstream:
 
 startnewrelease:
 	dh_testdir
-	@ver=$$(echo "$(revision)" | perl -ne 'if (/^(\d*)\.(\d*)(.*)?$$/) { printf("%d.%d%s\n", $$1 + 1, $$2 +1, $$3) }'); \
+	@[ -f "$(DEBIAN)/etc/update.conf" ] && . "$(DEBIAN)/etc/update.conf"; \
+	if [ -n "$$BACKPORT_SUFFIX" ]; then \
+		ver="$$(dpkg-parsechangelog -l"$$DEBIAN_MASTER/changelog" -SVersion)~$${BACKPORT_SUFFIX}.1"; \
+		prev_ver="$$(dpkg-parsechangelog -l"$(DEBIAN)/changelog" -SVersion)"; \
+		if [ "$${ver%.*}" = "$${prev_ver%.*}" ]; then \
+			ver="$${ver%.*}.$$(( $${prev_ver##*.} +1 ))"; \
+		fi; \
+	else \
+		ver="$(release)-$$(echo "$(revision)" | \
+			perl -ne 'if (/^(\d*)\.(\d*)(.*)?$$/) { printf("%d.%d%s\n", $$1 + 1, $$2 +1, $$3) }')"; \
+	fi; \
 	now="$(shell date -R)"; \
-	echo "Creating new changelog set for $(release)-$$ver..."; \
-	echo -e "$(src_pkg_name) ($(release)-$$ver) UNRELEASED; urgency=medium\n" > $(DEBIAN)/changelog.new; \
+	echo "Creating new changelog set for $$ver..."; \
+	echo -e "$(src_pkg_name) ($$ver) UNRELEASED; urgency=medium\n" > $(DEBIAN)/changelog.new; \
 	echo "  CHANGELOG: Do not edit directly. Autogenerated at release." >> \
 		$(DEBIAN)/changelog.new; \
 	echo "  CHANGELOG: Use the printchanges target to see the curent changes." \