debian: fix dpkg tool invocations to work on Ubuntu 12.04

dpkg-parsechangelog and dpkg-source were both using flags
not yet available in the versions available on 12.04.

Signed-off-by: Martin Winter <mwinter@opensourcerouting.org>

debian/backports/rules

@@ -76,7 +76,7 @@ $(TARBALLDIR)/$(SRCPKG)_$$(DEBIAN_VERSION_$(1)).dsc:
 		-c$$(CONTROL_$(1)) \
 		--format='3.0 (custom)' \
 		--target-format='$$(SOURCEFORMAT_$(1))' \
-		--build . $$^
+		-b . $$^
 
 ifeq ($$(SOURCEFORMAT_$(1)),3.0 (quilt))
 # this target depends on the orig.tar.gz file, for which there is no target in

debian/rules

@@ -106,13 +106,14 @@ KNOWN_BACKPORTS = ubuntu12.04 ubuntu14.04 ubuntu16.04
 ORIG_VERSION := $(shell dh_testdir && grep -E < configure.ac '^AC_INIT\(.*\)' \
 		| cut -d, -f2 | xargs echo)
 DEBIAN_VERSION := $(shell dh_testdir && \
-		dpkg-parsechangelog -c1 -Sversion < debian/changelog)
+		dpkg-parsechangelog -c1 < debian/changelog | \
+		sed -rn 's/^Version: ?//p')
 -include debian/backports/rules
 
 ifneq ($(TARBALLDIR),)
 # better error message on missing .orig.tar.gz
 $(TARBALLDIR)/$(SRCPKG)_$(ORIG_VERSION).orig.tar.gz:
-	@ echo "\`$(TARBALLDIR)/$(SRCPKG)_$(ORIG_VERSION).orig.tar.gz'" not
+	@ echo "\`$(TARBALLDIR)/$(SRCPKG)_$(ORIG_VERSION).orig.tar.gz'" not \
 		found and not generated by debian/rules. Provided you have the \
 		necessary packages installed, you can generate it yourself via \
 		"\"./bootstrap.sh && ./configure && make dist\"" \

debian/rules.orig

@@ -96,3 +96,22 @@ override_dh_systemd_start:
 override_dh_systemd_enable:
 	dh_systemd_enable frr.service
 
+# backports
+SRCPKG = frr
+KNOWN_BACKPORTS = ubuntu12.04 ubuntu14.04 ubuntu16.04
+ORIG_VERSION := $(shell dh_testdir && grep -E < configure.ac '^AC_INIT\(.*\)' \
+		| cut -d, -f2 | xargs echo)
+DEBIAN_VERSION := $(shell dh_testdir && \
+		dpkg-parsechangelog -c1 -Sversion < debian/changelog)
+-include debian/backports/rules
+
+ifneq ($(TARBALLDIR),)
+# better error message on missing .orig.tar.gz
+$(TARBALLDIR)/$(SRCPKG)_$(ORIG_VERSION).orig.tar.gz:
+	@ echo "\`$(TARBALLDIR)/$(SRCPKG)_$(ORIG_VERSION).orig.tar.gz'" not
+		found and not generated by debian/rules. Provided you have the \
+		necessary packages installed, you can generate it yourself via \
+		"\"./bootstrap.sh && ./configure && make dist\"" \
+		and renaming the resulting file.
+	exit 1
+endif # def TARBALLDIR