From ff0636635a0d20562d86ab5f4450bb8066dbd7dc Mon Sep 17 00:00:00 2001
From: Dave Young <dyoung@redhat.com>
Date: Mon, 10 Sep 2012 16:10:46 +0800
Subject: move get_persistent_dev to dracut-functions.sh

kdump module also need to convert dev name to udev symlinks.
So better to move function get_persistent_dev() to dracut-functions.sh

Also in this patch improvement and fix the original function:
a) use udevadm info --query=name to get the kernel name.
   This will fix the issue caused by passing symbolic link of a device.
b) fix a bug to compare $_tmp instead of $i with $_dev. Really sorry,
   should have tested more carefully.

Signed-off-by: Dave Young <dyoung@redhat.com>
---
 dracut-functions.sh | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

(limited to 'dracut-functions.sh')

diff --git a/dracut-functions.sh b/dracut-functions.sh
index 2399a1da..e6200c26 100755
--- a/dracut-functions.sh
+++ b/dracut-functions.sh
@@ -239,6 +239,21 @@ else
     }
 fi
 
+get_persistent_dev() {
+    local i _tmp _dev
+
+    _dev=$(udevadm info --query=name --name="$1" 2>/dev/null)
+    [ -z "$_dev" ] && return
+
+    for i in /dev/disk/by-id/*; do
+        _tmp=$(udevadm info --query=name --name="$i" 2>/dev/null)
+        if [ "$_tmp" = "$_dev" ]; then
+            echo $i
+            return
+        fi
+    done
+}
+
 # get_fs_env <device>
 # Get and set the ID_FS_TYPE and ID_FS_UUID variable from udev for a device.
 # Example:
-- 
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