adjust /etc/{passwd|shadow|group|gshadow} handling in ubuntu-touch for more info so the log gets all needed data for necessary changes at once

debian/changelog

@@ -1,3 +1,11 @@
+livecd-rootfs (2.258) UNRELEASED; urgency=medium
+
+  * collect changes to /etc/{passwd|shadow|group|gshadow} in the error output
+    in case they got updated on ubuntu-touch. Give a proper hint what to
+    change to make the error go away on the next run.
+
+ -- Oliver Grawert <ogra@ubuntu.com>  Wed, 29 Oct 2014 09:49:56 +0100
+
 livecd-rootfs (2.257) utopic; urgency=medium
 
   * Drop the click packages moved in 2.255 from the rootfs, leaving them

live-build/ubuntu-touch/hooks/99zz-check-uid-gid.chroot

@@ -1,5 +1,7 @@
 #!/bin/sh -eu
 
+ERRCNT=""
+
 passwd_hash=$(set -- $(md5sum /etc/passwd) && echo $1)
 shadow_hash=$(set -- $(cat /etc/shadow | sed "s/:.*:0:99999:/:0:99999:/g" | md5sum) && echo $1)
 group_length=$(cat /etc/group | wc -l)
@@ -12,26 +14,39 @@ gshadow_orig_length=$(cat /etc/gshadow.orig | wc -l)
 
 if [ "$passwd_hash" != "$passwd_orig_hash" ]; then
     echo "/etc/passwd has changed during setup." >&2
+    echo "The new /etc/passwd md5sum is: $passwd_hash" >&2
     diff -Nrup /etc/passwd.orig /etc/passwd >&2
-    exit 1
+    ERRCNT=1
 fi
 
 if [ "$shadow_hash" != "$shadow_orig_hash" ]; then
     echo "/etc/shadow has changed during setup." >&2
+    echo "The new /etc/shadow md5sum is: $shadow_hash" >&2
     diff -Nrup /etc/shadow.orig /etc/shadow >&2
-    exit 1
+    ERRCNT=1
 fi
 
 if [ "$group_length" != "$group_orig_length" ]; then
     echo "/etc/group has changed during setup." >&2
     diff -Nrup /etc/group.orig /etc/group >&2
-    exit 1
+    ERRCNT=1
 fi
 
 if [ "$gshadow_length" != "$gshadow_orig_length" ]; then
     echo "/etc/gshadow has changed during setup." >&2
     diff -Nrup /etc/gshadow.orig /etc/gshadow >&2
-    exit 1
+    ERRCNT=1
+fi
+
+if [ -n "$ERRCNT" ]; then
+	echo "There were changes to the password database,"
+	echo "please adjust the values in the livecd-rootfs source in the file:"
+	echo "live-build/ubuntu-touch/hooks/00-uid-gid-fix.chroot_early"
+	echo
+	echo "Please check also if a maintainer script of the package"
+	echo "that added these entries perhaps crated a home directory and,"
+	echo "if needed, add code for creation of it to the above hook"
+	exit 1
 fi
 
 rm /etc/passwd.orig /etc/shadow.orig /etc/group.orig /etc/gshadow.orig