[kexec-tools] Handle rootfs correctly

[Cong Wang]

commit 2630148dc7f93d43282c07a968a86e5a52bf2192
Author: Cong Wang <xiyou.wangcong at gmail.com>
Date:   Wed Jan 25 12:18:51 2012 +0800

    Handle rootfs correctly

 kexec-tools.spec |    5 ++++-
 mkdumprd         |   19 +++++++++++++++++--
 2 files changed, 21 insertions(+), 3 deletions(-)
---
diff --git a/kexec-tools.spec b/kexec-tools.spec
index b3142d9..19e5fe8 100644
--- a/kexec-tools.spec
+++ b/kexec-tools.spec
@@ -1,6 +1,6 @@
 Name: kexec-tools
 Version: 2.0.3
-Release: 32%{?dist}
+Release: 33%{?dist}
 License: GPLv2
 Group: Applications/System
 Summary: The kexec/kdump userspace component.
@@ -289,6 +289,9 @@ done
 
 
 %changelog
+* Wed Jan 25 2012 Cong Wang <xiyou.wangcong at gmail.com> - 2.0.2-33
+- Handle rootfs correctly.
+
 * Tue Jan 10 2012 Cong Wang <xiyou.wangcong at gmail.com> - 2.0.2-32
 - Fix add_dracut_arg in mkdumprd.
 
diff --git a/mkdumprd b/mkdumprd
index d621f00..890acaa 100644
--- a/mkdumprd
+++ b/mkdumprd
@@ -65,6 +65,10 @@ to_dev_name() {
     echo $dev
 }
 
+get_rootdev() {
+    mount | grep 'on / ' | grep -v rootfs | awk '{print $1}'
+}
+
 to_mount() {
     local _dev=$(to_dev_name $1)
     echo "$(grep "$_dev" /proc/mounts | cut -d' ' -f1-4)"
@@ -75,6 +79,7 @@ check_remote() {
     return
 }
 
+add_dracut_mount "$(to_mount "$(get_rootdev)")"
 if [ -n "$conf_file" ]; then
     while read config_opt config_val;
     do
@@ -83,7 +88,16 @@ if [ -n "$conf_file" ]; then
             extra_modules="$extra_modules $config_val"
             ;;
         ext[234]|xfs|btrfs|minix)
-            add_dracut_mount "$(to_mount $config_val)"
+            _dev=$(to_dev_name "$config_val")
+            _mnt=$(to_mount "$config_val")
+            if [ "$_dev" = "$(get_rootdev)" ]; then
+                :
+            elif [ -n "$_mnt" ]; then
+                add_dracut_mount "$_mnt"
+            else
+                echo "Dump target $config_val is probably not mounted."
+                exit 1
+            fi
             ;;
         raw)
             #TODO
@@ -120,6 +134,7 @@ then
 fi
 
 dracut "${dracut_args[@]}" -M "$@"
+_rc=$?
 sync
-exit $?
+exit $_rc