[Buildroot] [PATCH v4 04/18] fs/tar: make results reproducible

[Jérôme Pouiller]

In order to make tar images reproducible, force files order in tarball.

This work was sponsored by `BA Robotic Systems'.

Signed-off-by: Jérôme Pouiller <jezz at sysmic.org>
---

Notes:
    v3:
      - Use `find | sort |' instead of --sort (Arnout)

 fs/tar/tar.mk | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/tar/tar.mk b/fs/tar/tar.mk
index 11c69c5..70dc454 100644
--- a/fs/tar/tar.mk
+++ b/fs/tar/tar.mk
@@ -7,7 +7,8 @@
 TAR_OPTS := $(call qstrip,$(BR2_TARGET_ROOTFS_TAR_OPTIONS))
 
 define ROOTFS_TAR_CMD
-	tar $(TAR_OPTS) -cf $@ --numeric-owner -C $(TARGET_DIR) .
+	( cd $(TARGET_DIR); find -print0 | LC_ALL=C sort -z | \
+		tar $(TAR_OPTS) -cf $@ --null -T - --no-recursion --numeric-owner )
 endef
 
 $(eval $(call ROOTFS_TARGET,tar))
-- 
1.9.1