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>

diff --git a/meta/classes/image_types.bbclass b/meta/classes/image_types.bbclass
index c937ae45384f8548b793f687a6a3962b83734a11..76949d1051d388353e6a3e38ea1359ab54b67bec 100644 (file)
--- a/meta/classes/image_types.bbclass
+++ b/meta/classes/image_types.bbclass
@@ -110,7 +110,7 @@ IMAGE_CMD_squashfs-lz4 = "mksquashfs ${IMAGE_ROOTFS} ${IMGDEPLOYDIR}/${IMAGE_NAM
 
 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 () {