From: Victor Lowther <victor.lowther@gmail.com>
Date: Sat, 15 Aug 2009 21:46:34 +0000 (-0500)
Subject: Make hostonly check for dmraid only pass if root is really on
X-Git-Tag: 001~46
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=dc670134f8adac834426cf4c2151ba505359dcb3;p=thirdparty%2Fdracut.git

Make hostonly check for dmraid only pass if root is really on
a dmraid volume somehow.
---

diff --git a/modules.d/90dmraid/check b/modules.d/90dmraid/check
index 45e14052e..1757dfd75 100755
--- a/modules.d/90dmraid/check
+++ b/modules.d/90dmraid/check
@@ -4,11 +4,39 @@
 # in trying to support it in the initramfs.
 which dmraid >/dev/null 2>&1 || exit 1
 
-# Hostonly checking should really fail if the root device is not on a 
-# dmraid volume.  I am lazy.  Therefore, fail the hostonly check only
-# if we are not using dmraid right now.
-if [[ $1 = -h ]]; then
-    dmraid -r | grep -q ok || exit 1
+is_dmraid() { /lib/udev/vol_id /dev/block/$1 |grep -v linux_raid_member | \
+    grep -q _raid_member; }
+
+check_block_and_slaves() (
+    # $1 = block device in major:minor format
+    local x
+    cd /sys/dev/block/$1
+    [[ -b /dev/block/$1 ]] || return 1 # Not a block device? So sorry.
+    is_dmraid $1 && return
+    [[ -d slaves ]] || return 1 # there are no underlying devices, done.
+    # we want to search the tree breadthwise, so...
+    for x in slaves/*/dev; do
+	is_dmraid $(cat "$x") && return 0
+    done
+    for x in slaves/*/dev; do
+	check_block_and_slaves $(cat "$x") &&  return 0
+    done
+    return 1
+)
+
+if [[ $1 = '-h' ]] ; then
+    rootdev=''
+    while read blkdev fs type opts misc; do
+	[[ $blkdev = rootfs ]] && continue # skip rootfs entry
+	[[ $fs = / ]] && { rootdev=$blkdev; break; }
+    done < /proc/mounts
+    [[ -b $rootdev ]] || exit 1 # Not on a block device?  Definitly not dmraid
+    # get major/minor for the device
+    majmin=$(ls -nLl "$rootdev" | \
+	(read x x x x maj min x; maj=${maj//,/}; echo $maj:$min))
+    # now, walk backwards though our master/slave relationships looking
+    # for a dmraid device
+    check_block_and_slaves $majmin || exit 1
 fi
 
 exit 0