tests/as-debootstrap-unshare-wrapper: systemd-sysusers before systemd 252 doesn't respect SOURCE_DATE_EPOCH when adding users to /etc/shadow

tests/as-debootstrap-unshare-wrapper

@@ -47,6 +47,20 @@ rm /tmp/debian-mm/var/cache/apt/archives/lock
 rm /tmp/debian-mm/var/lib/apt/lists/lock
 rm /tmp/debian-mm/var/lib/dpkg/arch
 
+# workaround for https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=917773
+# also needed for users that are created by systemd-sysusers before systemd 252
+# https://github.com/systemd/systemd/pull/24534
+for f in shadow shadow-; do
+	if ! cmp /tmp/debian-debootstrap/etc/$f /tmp/debian-mm/etc/$f >&2; then
+		echo patching /etc/$f >&2
+		awk -v FS=: -v OFS=: -v SDE={{ SOURCE_DATE_EPOCH }} '{ print $1,$2,int(SDE/60/60/24),$4,$5,$6,$7,$8,$9 }' < /tmp/debian-mm/etc/$f > /tmp/debian-mm/etc/$f.bak
+		cat /tmp/debian-mm/etc/$f.bak > /tmp/debian-mm/etc/$f
+		rm /tmp/debian-mm/etc/$f.bak
+	else
+		echo no difference for /etc/$f >&2
+	fi
+done
+
 # check if the file content differs
 diff --no-dereference --recursive /tmp/debian-debootstrap /tmp/debian-mm >&2