[PATCH V4 2/4] kdumpctl: force rebuild in case of dynamic system modification

[Pratyush Anand]

There could be some dynamic system modification, which may affect kdump
kernel boot process. In such situation initramfs must be rebulit on the
basis of changes.
Since most of these checking methods will use information from
TARGET_INITRD, therefore check for its existence in common code.

Signed-off-by: Pratyush Anand <panand(a)redhat.com&gt;
---
 kdumpctl | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/kdumpctl b/kdumpctl
index ef18a2d4f6ce..41dcf6473e24 100755
--- a/kdumpctl
+++ b/kdumpctl
@@ -327,10 +327,21 @@ setup_target_initrd()
 	fi
 }
 
+# returns 0 if system is not modified
+# returns 1 if system is modified
+# returns 2 if system modification is invalid
+is_system_modified()
+{
+	[[ -f $TARGET_INITRD ]] || return 1
+
+	return 0
+}
+
 check_rebuild()
 {
 	local extra_modules modified_files=""
 	local _force_rebuild force_rebuild="0"
+	local ret system_modified="0"
 	local initramfs_has_fadump
 
 	check_boot_dir
@@ -388,6 +399,14 @@ check_rebuild()
 		fi
 	done
 
+	is_system_modified
+	ret=$?
+	if [ $ret -eq 2 ]; then
+		return 1
+	elif [ $ret -eq 1 ];then
+		system_modified="1"
+	fi
+
 	#check if target initrd has fadump support
 	if [ "$DEFAULT_DUMP_MODE" = "fadump" ] && [ -f
"$TARGET_INITRD" ]; then
 		initramfs_has_fadump=`lsinitrd -m $TARGET_INITRD | grep ^kdumpbase$ | wc -l`
@@ -399,6 +418,8 @@ check_rebuild()
 		echo "$TARGET_INITRD has no fadump support"
 	elif [ "$force_rebuild" != "0" ]; then
 		echo -n "Force rebuild $TARGET_INITRD"; echo
+	elif [ "$system_modified" != "0" ]; then
+		:
 	elif [ -n "$modified_files" ]; then
 		echo "Detected change(s) in the following file(s):"
 		echo -n "  "; echo "$modified_files" | sed 's/\s/\n  /g'
-- 
2.5.0