mkconfig_loopback.patch: Use different GRUB loop devices for different

OS loop devices (thanks, bcbc; LP: #888281).

debian/changelog

@@ -2,6 +2,8 @@ grub2 (1.99-18) UNRELEASED; urgency=low
 
   * Ensure that /sbin and /usr/sbin are in $PATH when running tests (closes:
     #662916).
+  * mkconfig_loopback.patch: Use different GRUB loop devices for different
+    OS loop devices (thanks, bcbc; LP: #888281).
 
  -- Colin Watson <cjwatson@debian.org>  Wed, 07 Mar 2012 10:06:22 +0000
 

debian/patches/mkconfig_loopback.patch

@@ -13,13 +13,14 @@ Index: b/util/grub-mkconfig_lib.in
 ===================================================================
 --- a/util/grub-mkconfig_lib.in
 +++ b/util/grub-mkconfig_lib.in
-@@ -105,6 +105,20 @@
+@@ -105,6 +105,21 @@
  {
    device="$1"
  
 +  loop_file=
 +  case ${device} in
 +    /dev/loop/*|/dev/loop[0-9])
++      grub_loop_device="${device#/dev/}"
 +      loop_file=`losetup "${device}" | sed -e "s/^[^(]*(\([^)]\+\)).*/\1/"`
 +      case $loop_file in
 +        /dev/*) ;;
@@ -34,7 +35,7 @@ Index: b/util/grub-mkconfig_lib.in
    if dmsetup status $device 2>/dev/null | grep -q 'crypt[[:space:]]$'; then
      grub_warn \
        "$device is a crypto device, which GRUB cannot read directly.  Some" \
-@@ -141,6 +155,14 @@
+@@ -141,6 +156,14 @@
    if fs_uuid="`"${grub_probe}" --device "${device}" --target=fs_uuid 2> /dev/null`" ; then
      echo "search --no-floppy --fs-uuid --set=root ${fs_uuid}"
    fi
@@ -42,8 +43,8 @@ Index: b/util/grub-mkconfig_lib.in
 +  if [ "x${loop_file}" != x ]; then
 +    loop_mountpoint="$(awk '"'${loop_file}'" ~ "^"$2 && $2 != "/" { print $2 }' /proc/mounts | tail -n1)"
 +    if [ "x${loop_mountpoint}" != x ]; then
-+      echo "loopback loop0 ${loop_file#$loop_mountpoint}"
-+      echo "set root=(loop0)"
++      echo "loopback ${grub_loop_device} ${loop_file#$loop_mountpoint}"
++      echo "set root=(${grub_loop_device})"
 +    fi
 +  fi
  }

debian/patches/mkconfig_skip_readme.patch

@@ -9,7 +9,7 @@ Index: b/util/grub-mkconfig_lib.in
 ===================================================================
 --- a/util/grub-mkconfig_lib.in
 +++ b/util/grub-mkconfig_lib.in
-@@ -170,7 +170,7 @@
+@@ -171,7 +171,7 @@
    if test -f "$1" ; then
      case "$1" in
        *.dpkg-*) return 1 ;; # debian dpkg