BACKPORT: Make grab_md5 more robust

squeeze/debian/changelog

@@ -58,6 +58,7 @@ debian-cd (3.1.6) UNRELEASED-backport; urgency=low
   * Don't exclude all the udebs for s390. Some users really do need them
     (loading from a CD/DVD used over the network). Closes: Bug #673576
   * Explicitly add s390-tools and sysconfig-hardware for s390.
+  * Make grab_md5 more robust
 
  -- Raphaël Hertzog <hertzog@debian.org>  Fri, 04 Feb 2011 09:59:21 +0100
 

squeeze/tools/grab_md5

@@ -8,6 +8,8 @@
 # Parse Packages and Sources files out of a mirror and pre-process
 # them into a single list ready for mkisofs to check later
 
+set -e
+
 MIRROR=$1
 ARCHES="$2"
 CODENAME=$3
@@ -19,6 +21,13 @@ do
     LOCATIONS="$MIRROR/dists/$CODENAME/ $MIRROR/dists/$DI_CODENAME/"
     echo "Looking in $LOCATIONS"
 
+    for LOCATION in $LOCATIONS; do
+        if [ ! -d $LOCATION ]; then
+            echo "Error: $LOCATION is not a directory"
+            exit 1
+        fi
+    done
+
     case $ARCH in
         source)
             FILES=`find $LOCATIONS -name Sources.gz`