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From 3f0c88e2ffa15cfb34641397cc9bdbe39085f1ba Mon Sep 17 00:00:00 2001
From: Colin Watson <cjwatson@debian.org>
Date: Mon, 13 Jan 2014 12:13:00 +0000
Subject: Handle filesystems loop-mounted on file images
Improve prepare_grub_to_access_device to emit appropriate commands for
such filesystems, and ignore them in Linux grub.d scripts.
This is needed for Ubuntu's Wubi installation method.
This patch isn't inherently Debian/Ubuntu-specific. losetup and
/proc/mounts are Linux-specific, though, so we might need to refine this
before sending it upstream. The changes to the Linux grub.d scripts
might be better handled by integrating 10_lupin properly instead.
Patch-Name: mkconfig-loopback.patch
---
util/grub-mkconfig_lib.in | 24 ++++++++++++++++++++++++
util/grub.d/10_linux.in | 5 +++++
util/grub.d/20_linux_xen.in | 5 +++++
3 files changed, 34 insertions(+)
diff --git a/util/grub-mkconfig_lib.in b/util/grub-mkconfig_lib.in
index 17f9b3e58..e62cfc22b 100644
--- a/util/grub-mkconfig_lib.in
+++ b/util/grub-mkconfig_lib.in
@@ -133,6 +133,22 @@ prepare_grub_to_access_device ()
esac
done
+ loop_file=
+ case $1 in
+ /dev/loop/*|/dev/loop[0-9])
+ grub_loop_device="${1#/dev/}"
+ loop_file=`losetup "$1" | sed -e "s/^[^(]*(\([^)]\+\)).*/\1/"`
+ case $loop_file in
+ /dev/*) ;;
+ *)
+ loop_device="$1"
+ shift
+ set -- `"${grub_probe}" --target=device "${loop_file}"` "$@"
+ ;;
+ esac
+ ;;
+ esac
+
# Abstraction modules aren't auto-loaded.
abstraction="`"${grub_probe}" --device $@ --target=abstraction`"
for module in ${abstraction} ; do
@@ -169,6 +185,14 @@ prepare_grub_to_access_device ()
fi
fi
IFS="$old_ifs"
+
+ 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 ${grub_loop_device} ${loop_file#$loop_mountpoint}"
+ echo "set root=(${grub_loop_device})"
+ fi
+ fi
}
grub_get_device_id ()
diff --git a/util/grub.d/10_linux.in b/util/grub.d/10_linux.in
index 9446d6833..46696dd66 100644
--- a/util/grub.d/10_linux.in
+++ b/util/grub.d/10_linux.in
@@ -40,6 +40,11 @@ fi
case ${GRUB_DEVICE} in
/dev/loop/*|/dev/loop[0-9])
GRUB_DEVICE=`losetup ${GRUB_DEVICE} | sed -e "s/^[^(]*(\([^)]\+\)).*/\1/"`
+ # We can't cope with devices loop-mounted from files here.
+ case ${GRUB_DEVICE} in
+ /dev/*) ;;
+ *) exit 0 ;;
+ esac
;;
esac
diff --git a/util/grub.d/20_linux_xen.in b/util/grub.d/20_linux_xen.in
index 3b1f47049..7620a14fa 100644
--- a/util/grub.d/20_linux_xen.in
+++ b/util/grub.d/20_linux_xen.in
@@ -40,6 +40,11 @@ fi
case ${GRUB_DEVICE} in
/dev/loop/*|/dev/loop[0-9])
GRUB_DEVICE=`losetup ${GRUB_DEVICE} | sed -e "s/^[^(]*(\([^)]\+\)).*/\1/"`
+ # We can't cope with devices loop-mounted from files here.
+ case ${GRUB_DEVICE} in
+ /dev/*) ;;
+ *) exit 0 ;;
+ esac
;;
esac
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