From 91106c16b735227206cb754317dfbcd1308b3152 Mon Sep 17 00:00:00 2001
From: Pratyush Anand <panand@redhat.com>
Date: Sep 16 2016 07:45:13 +0000
Subject: kdumpctl: fix target identification for systems without initrd


We get following error on the systems that have everything built-in and no
initrd is used.

	Kernel dev name of /dev/root is not found.
	Dump target /dev/root is probably not mounted.

It happens because `df $path` gets /dev/root from /proc/self/mountinfo.

Fix this by identifying real target device when `df $path` returns
Filesystem as /dev/root.

Reported-and-tested-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Pratyush Anand <panand@redhat.com>
Acked-by: Dave Young <dyoung@redhat.com>

---

diff --git a/kdump-lib.sh b/kdump-lib.sh
index 4567a05..2bf14f8 100755
--- a/kdump-lib.sh
+++ b/kdump-lib.sh
@@ -174,7 +174,11 @@ get_mntpoint_from_path()
 
 get_target_from_path()
 {
-    echo $(df $1 | tail -1 |  awk '{print $1}')
+    local _target
+
+    _target=$(df $1 2>/dev/null | tail -1 |  awk '{print $1}')
+    [[ "$_target" == "/dev/root" ]] && [[ ! -e /dev/root ]] && _target=$(get_root_fs_device)
+    echo $_target
 }
 
 get_fs_type_from_target() 
diff --git a/kdumpctl b/kdumpctl
index 594450d..19431e1 100755
--- a/kdumpctl
+++ b/kdumpctl
@@ -379,9 +379,9 @@ check_dump_fs_modified()
 		_new_fstype=$(blkid $_target | awk -F"TYPE=" '{print $2}' | cut -d '"' -f 2)
 	else
 		_path=$(get_save_path)
-		set -- $(df -T $_path 2>/dev/null | tail -1 | awk '{ print $1, $2}')
-		_target=$(to_dev_name $1)
-		_new_fstype=$2
+		_target=$(get_target_from_path $_path)
+		_target=$(to_dev_name $_target)
+		_new_fstype=$(get_fs_type_from_target $_target)
 		if [[ -z "$_target" || -z "$_new_fstype" ]];then
 			echo "Dump path $_path does not exist"
 			return 2