kbuild: check timestamps on files for initramfs

  Add a comment to gen_initramfs_list.sh output that contains the
  numeric mtime of the last modified file in the source directory,
  or the mtime of the source list.  This should cause the initramfs
  image to be rebuild if a file in the source directory changed, or
  the source list (if that was used rather than a directory as source).


Signed-off-by: Martin Schlemmer <azarah@nosferatu.za.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

1 files changed, 19 insertions, 4 deletions

diff --git a/scripts/gen_initramfs_list.sh b/scripts/gen_initramfs_list.sh
index 1d415792ac7811..2a697c37135ed2 100644
--- a/scripts/gen_initramfs_list.sh
+++ b/scripts/gen_initramfs_list.sh
@@ -37,6 +37,18 @@ filetype() {
 	return 0
 }
 
+print_mtime() {
+	local argv1="$1"
+	local my_mtime="0"
+
+	if [ -e "${argv1}" ]; then
+		my_mtime=$(find "${argv1}" -printf "%T@\n" | sort -r | head -n 1)
+	fi
+	
+	echo "# Last modified: ${my_mtime}"
+	echo
+}
+
 parse() {
 	local location="$1"
 	local name="${location/${srcdir}//}"
@@ -77,16 +89,19 @@ parse() {
 	return 0
 }
 
-if [ -z $1 ]; then
+if [ -z "$1" ]; then
 	simple_initramfs
-elif [ -f $1 ]; then
-	cat $1
-elif [ -d $1 ]; then
+elif [ -f "$1" ]; then
+	print_mtime "$1"
+	cat "$1"
+elif [ -d "$1" ]; then
 	srcdir=$(echo "$1" | sed -e 's://*:/:g')
 	dirlist=$(find "${srcdir}" -printf "%p %m %U %G\n" 2>/dev/null)
 
 	# If $dirlist is only one line, then the directory is empty
 	if [  "$(echo "${dirlist}" | wc -l)" -gt 1 ]; then
+		print_mtime "$1"
+		
 		echo "${dirlist}" | \
 		while read x; do
 			parse ${x}