initramfs: Encode dependency on KBUILD_BUILD_TIMESTAMP

gen_initramfs.sh has an internal dependency on KBUILD_BUILD_TIMESTAMP
for generating file mtimes that is not exposed to make, so changing
KBUILD_BUILD_TIMESTAMP will not trigger a rebuild of the archive.

Declare the mtime date as a new parameter to gen_initramfs.sh to encode
KBUILD_BUILD_TIMESTAMP in the shell command, thereby making make aware
of the dependency.

It will rebuild if KBUILD_BUILD_TIMESTAMP changes or is newly set/unset.
It will _not_ rebuild if KBUILD_BUILD_TIMESTAMP is unset before and
after. This should be fine for anyone who doesn't care about setting
specific build times in the first place.

Reviewed-by: Andrew Donnellan <ajd@linux.ibm.com>
Tested-by: Andrew Donnellan <ajd@linux.ibm.com>
Signed-off-by: Benjamin Gray <bgray@linux.ibm.com>
Reviewed-by: Nicolas Schier <n.schier@avm.de>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

diff --git a/usr/Makefile b/usr/Makefile
index 59d9e8b..f8e1ad1 100644 (file)
--- a/usr/Makefile
+++ b/usr/Makefile
@@ -64,6 +64,7 @@ quiet_cmd_initfs = GEN     $@
        $(CONFIG_SHELL) $< -o $@ -l $(obj)/.initramfs_data.cpio.d \
        $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \
        $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID)) \
+       $(if $(KBUILD_BUILD_TIMESTAMP), -d "$(KBUILD_BUILD_TIMESTAMP)") \
        $(ramfs-input)
 
 # We rebuild initramfs_data.cpio if:

diff --git a/usr/gen_initramfs.sh b/usr/gen_initramfs.sh
index 63476bb..14b5782 100755 (executable)
--- a/usr/gen_initramfs.sh
+++ b/usr/gen_initramfs.sh
@@ -23,6 +23,7 @@ $0 [-o <file>] [-l <dep_list>] [-u <uid>] [-g <gid>] {-d | <cpio_source>} ...
        -g <gid>       Group ID to map to group ID 0 (root).
                       <gid> is only meaningful if <cpio_source> is a
                       directory.  "squash" forces all files to gid 0.
+       -d <date>      Use date for all file mtime values
        <cpio_source>  File list or directory for cpio archive.
                       If <cpio_source> is a .cpio file it will be used
                       as direct input to initramfs.
@@ -190,6 +191,7 @@ prog=$0
 root_uid=0
 root_gid=0
 dep_list=
+timestamp=
 cpio_list=$(mktemp ${TMPDIR:-/tmp}/cpiolist.XXXXXX)
 output="/dev/stdout"
 
@@ -218,6 +220,13 @@ while [ $# -gt 0 ]; do
                        [ "$root_gid" = "-1" ] && root_gid=$(id -g || echo 0)
                        shift
                        ;;
+               "-d")   # date for file mtimes
+                       timestamp="$(date -d"$1" +%s || :)"
+                       if test -n "$timestamp"; then
+                               timestamp="-t $timestamp"
+                       fi
+                       shift
+                       ;;
                "-h")
                        usage
                        exit 0
@@ -237,11 +246,4 @@ done
 
 # If output_file is set we will generate cpio archive
 # we are careful to delete tmp files
-timestamp=
-if test -n "$KBUILD_BUILD_TIMESTAMP"; then
-       timestamp="$(date -d"$KBUILD_BUILD_TIMESTAMP" +%s || :)"
-       if test -n "$timestamp"; then
-               timestamp="-t $timestamp"
-       fi
-fi
 usr/gen_init_cpio $timestamp $cpio_list > $output