[oe-commits] Patrick Ohly : image_types.bbclass: allow replacing tar command

[git at git.openembedded.org]

Module: openembedded-core.git
Branch: master
Commit: d8db122114f4d0600b662f79b3673108b4b6c0b7
URL:    http://git.openembedded.org/?p=openembedded-core.git&a=commit;h=d8db122114f4d0600b662f79b3673108b4b6c0b7

Author: Patrick Ohly <patrick.ohly at intel.com>
Date:   Fri Aug 14 16:59:04 2015 +0200

image_types.bbclass: allow replacing tar command

Usually, the host's tar command is sufficient. However, special cases
like archiving xattrs depend on a modern GNU tar version. The new
IMAGE_CMD_TAR makes that possible, with xattrs given as example.

Signed-off-by: Patrick Ohly <patrick.ohly at intel.com>
Signed-off-by: Ross Burton <ross.burton at intel.com>

---

 meta/classes/image_types.bbclass | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/meta/classes/image_types.bbclass b/meta/classes/image_types.bbclass
index 35ceb7b..8547574 100644
--- a/meta/classes/image_types.bbclass
+++ b/meta/classes/image_types.bbclass
@@ -71,7 +71,19 @@ IMAGE_CMD_btrfs () {
 IMAGE_CMD_squashfs = "mksquashfs ${IMAGE_ROOTFS} ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.squashfs ${EXTRA_IMAGECMD} -noappend"
 IMAGE_CMD_squashfs-xz = "mksquashfs ${IMAGE_ROOTFS} ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.squashfs-xz ${EXTRA_IMAGECMD} -noappend -comp xz"
 IMAGE_CMD_squashfs-lzo = "mksquashfs ${IMAGE_ROOTFS} ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.squashfs-lzo ${EXTRA_IMAGECMD} -noappend -comp lzo"
-IMAGE_CMD_tar = "tar -cvf ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.tar -C ${IMAGE_ROOTFS} ."
+
+# By default, tar from the host is used, which can be quite old. If
+# you need special parameters (like --xattrs) which are only supported
+# by GNU tar upstream >= 1.27, then override that default:
+# IMAGE_CMD_TAR = "tar --xattrs --xattrs-include=*"
+# IMAGE_DEPENDS_tar_append = " tar-replacement-native"
+# EXTRANATIVEPATH += "tar-native"
+#
+# The GNU documentation does not specify whether --xattrs-include is necessary.
+# In practice, it turned out to be not needed when creating archives and
+# required when extracting, but it seems prudent to use it in both cases.
+IMAGE_CMD_TAR ?= "tar"
+IMAGE_CMD_tar = "${IMAGE_CMD_TAR} -cvf ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.tar -C ${IMAGE_ROOTFS} ."
 
 do_rootfs[cleandirs] += "${WORKDIR}/cpio_append"
 IMAGE_CMD_cpio () {