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

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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>
This commit is contained in:
Yann E. MORIN 2018-11-12 18:33:12 +01:00 committed by Peter Korsgaard
parent 43e6de35e9
commit 6d688e2132
1 changed files with 1 additions and 1 deletions
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2
fs/tar/tar.mk
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@ -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))