From f8342dd5f2235979db7b5fc0d54df408538921e6 Mon Sep 17 00:00:00 2001
From: Michal Soltys <soltys@ziu.info>
Date: Mon, 17 Oct 2011 23:36:33 +0200
Subject: [PATCH] check root candidates more carefully

This is from the following thread:

http://thread.gmane.org/gmane.linux.raid/35753/focus=35795

Additional tests + more specific info.

Signed-off-by: Michal Soltys <soltys@ziu.info>

[harald@redhat.com: usable_root(): relaxed check for root]
---
 modules.d/99base/dracut-lib.sh |    9 +++++++++
 modules.d/99base/init          |   12 ++++++++++--
 2 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/modules.d/99base/dracut-lib.sh b/modules.d/99base/dracut-lib.sh
index bc4d7c9..2cfaf93 100755
--- a/modules.d/99base/dracut-lib.sh
+++ b/modules.d/99base/dracut-lib.sh
@@ -544,3 +544,12 @@ foreach_uuid_until() (
 
     return 1
 )
+
+usable_root() {
+    local _d
+    [ -d $1 ] || return 1
+    for _d in proc sys dev; do
+        [ -e "$1"/$_d ] || return 1
+    done
+    return 0
+}
diff --git a/modules.d/99base/init b/modules.d/99base/init
index 06d61a8..556ac68 100755
--- a/modules.d/99base/init
+++ b/modules.d/99base/init
@@ -286,10 +286,18 @@ getarg 'rd.break=mount' 'rdbreak=mount' && emergency_shell -n mount "Break mount
 # be sourced any number of times. As soon as one suceeds, no more are sourced.
 i=0
 while :; do
-    [ -d "$NEWROOT/proc" ] && break;
+    if ismounted "$NEWROOT"; then
+        usable_root "$NEWROOT" && break;
+        umount "$NEWROOT"
+    fi
     for f in $hookdir/mount/*.sh; do
         [ -f "$f" ] && . "$f"
-        [ -d "$NEWROOT/proc" ] && break;
+        if ismounted "$NEWROOT"; then
+            usable_root "$NEWROOT" && break;
+            warn "$NEWROOT has no proper rootfs layout, ignoring and removing offending mount hook"
+            umount "$NEWROOT"
+            rm -f "$f"
+        fi
     done
 
     i=$(($i+1))