[Buildroot] [PATCH 2/6 v2] fs/tar: add support for xattrs (thus capabilties)
arnout at mind.be
Mon Nov 12 22:09:13 UTC 2018
On 12/11/2018 18:33, Yann E. MORIN wrote:
> 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').
So... currently capabilities are not included at all in the tarball, since
--xattrs is not passed at the moment?
But after this patch, they are still not included? Or does --xattrs-include
> 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 at free.fr>
> Cc: Ricardo Martincoski <ricardo.martincoski at gmail.com>
> Cc: Peter Korsgaard <peter at korsgaard.com>
> Cc: Arnout Vandecappelle <arnout at mind.be>
> fs/tar/tar.mk | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
> diff --git a/fs/tar/tar.mk b/fs/tar/tar.mk
> index 68149e9eb7..4c6327ace8 100644
> --- 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)
I think --xattrs-include should come before TAR_OPTS, so it can still be
overridden. Ah, darn, never mind, it can't be overridden, several
--xattrs-include options are cumulative and their order doesn't matter.
> $(eval $(rootfs))
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