debian: use dpkg-divert to adjust the launch script for CI testing

This means that if someone wants to use the test inteface with
packages, no hacky launching needed.

Just:

contrib/ci/build_and_install_debs.sh

@@ -11,13 +11,24 @@ EDITOR=/bin/true dch --create --package fwupd -v $VERSION "CI Build"
 dpkg-buildpackage
 
 #test the packages install
-dpkg -i ../*.deb
+dpkg -i `ls ../*.deb | grep -v fwupd-tests`
 
 # run the installed tests
 if [ "$CI" = "true" ]; then
-	sed -i "s,Exec=,Exec=/bin/sh -c 'FWUPD_TESTS=$CI ,;
-		s,Exec=.*$,&',;" \
-		/usr/share/dbus-1/system-services/org.freedesktop.fwupd.service
+	dpkg -i ../fwupd-tests*.deb
 	/etc/init.d/dbus start
 	gnome-desktop-testing-runner fwupd
+	apt purge -y fwupd-tests
 fi
+
+#test the packages remove
+apt purge -y fwupd \
+	     fwupd-doc \
+	     fwupd-dbgsym \
+	     gir1.2-fwupd-1.0 \
+	     libdfu1 \
+	     libdfu1-dbgsym \
+	     libdfu-dev \
+	     libfwupd1 \
+	     libfwupd1-dbgsym \
+	     libfwupd-dev

contrib/debian/fwupd-tests.install

@@ -1,2 +1,3 @@
 usr/share/installed-tests/*
 usr/lib/*/fwupd-plugins-2/libfu_plugin_test.so
+usr/share/dbus-1/system-services/org.freedesktop.fwupd.service

contrib/debian/fwupd-tests.postrm

@@ -0,0 +1,6 @@
+#!/bin/sh
+if [ "$1" = remove -o "$1" = purge ]; then
+	dpkg-divert --package fwupd-tests --remove --rename \
+                --divert /usr/share/dbus-1/system-services/org.freedesktop.fwupd.service.original \
+                         /usr/share/dbus-1/system-services/org.freedesktop.fwupd.service
+fi

contrib/debian/fwupd-tests.preinst

@@ -0,0 +1,7 @@
+#!/bin/sh
+
+if [ "$1" = "upgrade" ] || [ "$1" = "install" ]; then
+	dpkg-divert --package fwupd-tests --add --rename \
+		--divert /usr/share/dbus-1/system-services/org.freedesktop.fwupd.service.original \
+		         /usr/share/dbus-1/system-services/org.freedesktop.fwupd.service
+fi

contrib/debian/rules

@@ -33,9 +33,13 @@ override_dh_install:
 	sed -i 's,wheel,sudo,' ./debian/tmp/usr/share/polkit-1/rules.d/org.freedesktop.fwupd.rules
 	dh_install
 	dh_missing --fail-missing
+
 	#this is placed in fwupd-tests
 	rm -f debian/fwupd/usr/lib/*/fwupd-plugins-2/libfu_plugin_test.so
 
+	sed -i "s,Exec=,Exec=/bin/sh -c 'FWUPD_TESTS=1 ,; s,Exec=.*$$,&',;" \
+		debian/fwupd-tests/usr/share/dbus-1/system-services/org.freedesktop.fwupd.service
+
 override_dh_strip_nondeterminism:
 	dh_strip_nondeterminism -Xfirmware-example.xml.gz