tests: fall back to diffoscope if cmp failed

tests/chrootless

@@ -11,6 +11,6 @@ for INCLUDE in '' 'apt' 'apt,build-essential' 'systemd-sysv'; do
 			${INCLUDE:+--include="$INCLUDE"} \
 			{{ DIST }} "/tmp/$MODE.tar" {{ MIRROR }}
 	done
-	cmp /tmp/root.tar /tmp/chrootless.tar
+	cmp /tmp/root.tar /tmp/chrootless.tar || diffoscope /tmp/root.tar /tmp/chrootless.tar
 	rm /tmp/chrootless.tar /tmp/root.tar
 done

tests/chrootless-fakeroot

@@ -30,6 +30,6 @@ for INCLUDE in '' 'apt' 'apt,build-essential' 'systemd-sysv'; do
 	$prefix fakeroot {{ CMD }} --mode={{ MODE }} --variant={{ VARIANT }} --hook-dir=./hooks/merged-usr \
 		${INCLUDE:+--include="$INCLUDE"} \
 		{{ DIST }} /tmp/chrootless.tar {{ MIRROR }}
-	cmp /tmp/root.tar /tmp/chrootless.tar
+	cmp /tmp/root.tar /tmp/chrootless.tar || diffoscope /tmp/root.tar /tmp/chrootless.tar
 	rm /tmp/chrootless.tar /tmp/root.tar
 done

tests/chrootless-foreign

@@ -63,6 +63,6 @@ for INCLUDE in '' 'apt' 'systemd-sysv'; do
 			> "/tmp/$tar.tar.tmp"
 		mv "/tmp/$tar.tar.tmp" "/tmp/$tar.tar"
 	done
-	cmp /tmp/root.tar /tmp/chrootless.tar
+	cmp /tmp/root.tar /tmp/chrootless.tar || diffoscope /tmp/root.tar /tmp/chrootless.tar
 	rm /tmp/chrootless.tar /tmp/root.tar
 done

tests/merged-fakechroot-inside-unmerged-chroot

@@ -46,4 +46,4 @@ chmod +x script.sh
 	--customize-hook=./script.sh \
 	--customize-hook="copy-out /tmp/chroot-fakechroot.tar /tmp" \
 	{{ DIST }} /dev/null {{ MIRROR }}
-cmp /tmp/chroot-fakechroot.tar /tmp/chroot-root.tar
+cmp /tmp/chroot-fakechroot.tar /tmp/chroot-root.tar || diffoscope /tmp/chroot-fakechroot.tar /tmp/chroot-root.tar

tests/pivot_root

@@ -38,8 +38,8 @@ if [ {{ MODE }} = "unshare" ]; then
 		--customize-hook='umount -l mnt sys' \
 		{{ DIST }} /tmp/chroot2.tar {{ MIRROR }}
 
-		cmp /tmp/chroot1.tar /tmp/chroot2.tar
-		cmp /tmp/chroot1.tar /tmp/chroot3.tar
+		cmp /tmp/chroot1.tar /tmp/chroot2.tar || diffoscope /tmp/chroot1.tar /tmp/chroot2.tar
+		cmp /tmp/chroot1.tar /tmp/chroot3.tar || diffoscope /tmp/chroot1.tar /tmp/chroot3.tar
 		rm /tmp/chroot2.tar /tmp/chroot3.tar
 fi
 
@@ -51,5 +51,5 @@ $prefix {{ CMD }} --mode={{ MODE }} --variant=apt --include=mount \
 	--customize-hook='rm "$1/'"$MMDEBSTRAP"'"' \
 	{{ DIST }} /tmp/chroot2.tar {{ MIRROR }}
 
-cmp /tmp/chroot1.tar /tmp/chroot2.tar
-cmp /tmp/chroot1.tar /tmp/chroot3.tar
+cmp /tmp/chroot1.tar /tmp/chroot2.tar || diffoscope /tmp/chroot1.tar /tmp/chroot2.tar
+cmp /tmp/chroot1.tar /tmp/chroot3.tar || diffoscope /tmp/chroot1.tar /tmp/chroot3.tar