linux-kernel - unsquashfs not preserving file capabilities

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Message-ID: <CAGXD9OcLtQ9GPeBUeO=_gtVY_r5jkWeJK4F1Nf7CmpyYa_NwvA@mail.gmail.com>
Date:	Wed, 7 Oct 2015 07:28:02 -0700
From:	Prasad Koya <prasad.koya@...il.com>
To:	Andreas Gruenbacher <agruenba@...hat.com>,
	linux-fsdevel@...r.kernel.org
Cc:	Alexander Viro <viro@...iv.linux.org.uk>,
	Christoph Hellwig <hch@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Phillip Lougher <phillip@...ashfs.org.uk>
Subject: unsquashfs not preserving file capabilities

Hi

Not sure if there is a mailing list for squashfs-tools.

I'm not seeing xattrs after unsquashing. This is how we are using:

1. Install all of our RPMs with some root dir (rpm --root xyz)

2. mksquashfs of xyz. (-comp xz -Xbcj x86).

3. To update an rpm in image, we first unsquash  the fs made in step 2
with unsquashfs. Say this is dir xyz2, then do 'rpm --root xyz2 -U
changed.rpm'

Right after unsquashing in step 3, I don't see capabilities on, say, ping.

after first mksquashfs ie., installing all RPMs fresh:

bash% getfattr -n security.capability rootfs/usr/bin/ping
# file: usr/bin/ping
security.capability=0sAQAAAgAwAAAAAAAAAAAAAAAAAAA=

bash% getcap rootfs/usr/bin/ping
usr/bin/ping = cap_net_admin,cap_net_raw+ep

after unsquashfs:

bash% getfattr -n security.capability
/tmp/extracted/unsquashed/usr/bin/ping
/tmp/extracted/unsquashed/usr/bin/ping: security.capability: No such attribute

bash% getcap /tmp/extracted/unsquashed/usr/bin/ping
bash%

I explicitly specify '-xattrs' for both mksquashfs and unsquashfs. Is
this known issue?

thank you.
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