fadump: rebuild default initrd with dump capture capability

As default initrd is used for booting fadump capture kernel, it must be
rebuilt with dump capture capability when dump mode is fadump. Check if
default initrd is already fadump capable and rebuild, if necessary.

Signed-off-by: Hari Bathini <hbathini@linux.vnet.ibm.com>
Reviewed-by: Xunlei Pang <xlpang@redhat.com>

kdumpctl

@@ -6,6 +6,7 @@ KDUMP_COMMANDLINE=""
 KEXEC_ARGS=""
 KDUMP_CONFIG_FILE="/etc/kdump.conf"
 MKDUMPRD="/sbin/mkdumprd -f"
+DRACUT_MODULES_FILE="/usr/lib/dracut/modules.txt"
 SAVE_PATH=/var/crash
 SSH_KEY_LOCATION="/root/.ssh/kdump_id_rsa"
 INITRD_CHECKSUM_LOCATION="/boot/.fadump_initrd_checksum"
@@ -650,6 +651,7 @@ check_system_modified()
 check_rebuild()
 {
 	local extra_modules
+	local capture_capable_initrd="1"
 	local _force_rebuild force_rebuild="0"
 	local _force_no_rebuild force_no_rebuild="0"
 	local ret system_modified="0"
@@ -704,6 +706,12 @@ check_rebuild()
 	#since last build of the image file
 	if [ -f $TARGET_INITRD ]; then
 		image_time=`stat -c "%Y" $TARGET_INITRD 2>/dev/null`
+
+		#in case of fadump mode, check whether the default/target
+		#initrd is already built with dump capture capability
+		if [ "$DEFAULT_DUMP_MODE" == "fadump" ]; then
+			capture_capable_initrd=$(lsinitrd -f $DRACUT_MODULES_FILE $TARGET_INITRD | grep ^kdumpbase$ | wc -l)
+		fi
 	fi
 
 	check_system_modified
@@ -718,6 +726,8 @@ check_rebuild()
 
 	if [ $image_time -eq 0 ]; then
 		echo  -n "No kdump initial ramdisk found."; echo
+	elif [ "$capture_capable_initrd" == "0" ]; then
+		echo -n "Rebuild $TARGET_INITRD with dump capture support"; echo
 	elif [ "$force_rebuild" != "0" ]; then
 		echo -n "Force rebuild $TARGET_INITRD"; echo
 	elif [ "$system_modified" != "0" ]; then