fs/tar: add support for xattrs (thus capabilties)

By default, tar will not include any extended attribute (xattr) when
creating archives, and thus will not store capabilties either (as they
are stored in the xattr 'security.capability').

Using option --xattrs is enough to create a tarball with all the xattrs
attached to a file. However, extracting all xattrs from a tarball
requires that --xattrs-include='*' be used. This is not symetric (but on
purpose, as per the documentation), and so is confusing to some.

So, we use --xattrs-include='*' to create the archive, so as to be
explicit that we want all xattrs to be stored.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Ricardo Martincoski <ricardo.martincoski@gmail.com>
Cc: Peter Korsgaard <peter@korsgaard.com>
Cc: Arnout Vandecappelle <arnout@mind.be>
Reviewed-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

diff --git a/fs/tar/tar.mk b/fs/tar/tar.mk
index 68149e9eb748ce121dcee382204cc5b5d8a0c6d4..4c6327ace8b0aeebadac0101bb6cc977d57f9206 100644 (file)
--- a/fs/tar/tar.mk
+++ b/fs/tar/tar.mk
@@ -10,7 +10,7 @@ ROOTFS_TAR_DEPENDENCIES = $(BR2_TAR_HOST_DEPENDENCY)
 
 define ROOTFS_TAR_CMD
        (cd $(TARGET_DIR); find -print0 | LC_ALL=C sort -z | \
-               tar $(TAR_OPTS) -cf $@ --null --no-recursion -T - --numeric-owner)
+               tar $(TAR_OPTS) -cf $@ --null --xattrs-include='*' --no-recursion -T - --numeric-owner)
 endef
 
 $(eval $(rootfs))