image_types: Ensure tar archives are reproducible

The tar output seems to vary depending on the version of tar used and distro
configuration. Be explict about the output format to avoid this and be
determinstic.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit c56f3c9febc1732aa1302524c6c4da36f16bd1f7)
Signed-off-by: Steve Sakoman <steve@sakoman.com>

diff --git a/meta/classes/image_types.bbclass b/meta/classes/image_types.bbclass
index d81747527b45535404ca941a9bc0c908ec7624c9..6de16d42b97283187f201a3cfa2cc67e752d0ae7 100644 (file)
--- a/meta/classes/image_types.bbclass
+++ b/meta/classes/image_types.bbclass
@@ -126,7 +126,7 @@ IMAGE_CMD_squashfs-lz4 = "mksquashfs ${IMAGE_ROOTFS} ${IMGDEPLOYDIR}/${IMAGE_NAM
 # required when extracting, but it seems prudent to use it in both cases.
 IMAGE_CMD_TAR ?= "tar"
 # ignore return code 1 "file changed as we read it" as other tasks(e.g. do_image_wic) may be hardlinking rootfs
-IMAGE_CMD_tar = "${IMAGE_CMD_TAR} --sort=name --numeric-owner -cf ${IMGDEPLOYDIR}/${IMAGE_NAME}${IMAGE_NAME_SUFFIX}.tar -C ${IMAGE_ROOTFS} . || [ $? -eq 1 ]"
+IMAGE_CMD_tar = "${IMAGE_CMD_TAR} --sort=name --format=gnu --numeric-owner -cf ${IMGDEPLOYDIR}/${IMAGE_NAME}${IMAGE_NAME_SUFFIX}.tar -C ${IMAGE_ROOTFS} . || [ $? -eq 1 ]"
 
 do_image_cpio[cleandirs] += "${WORKDIR}/cpio_append"
 IMAGE_CMD_cpio () {