From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludovic.courtes@inria.fr>
Subject: bug#40043: `guix pack --format=squashfs` fails on CentOS7
Date: Tue, 24 Mar 2020 18:55:11 +0100
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 (Josh Marshall's message of "Thu, 12 Mar 2020 17:47:24 +0000")
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To: Josh Marshall <Josh.Marshall@jax.org>
Cc: 40043-done@debbugs.gnu.org

Hi Josh,

Josh Marshall <Josh.Marshall@jax.org> skribis:

> `guix pack --format=3Dsquashfs bash-minimal ...` fails on CentOS7 with SE=
Linux disabled.
>
> ```
> $ /var/guix/profiles/per-user/marshjo/current-guix/bin/guix describe
> Generation 9	Mar 12 2020 09:28:29	(current)
>   guix a595399
>     repository URL: https://git.savannah.gnu.org/git/guix.git
>     branch: master
>     commit: a595399230a7b1acb0b096b3d5a7474100014299
> ```

The log you posted reads this:

--8<---------------cut here---------------start------------->8---
Creating 4.0 filesystem on /gnu/store/mhhlqyazyvwz72y6dwh56fs1zlrvrl0h-squa=
shfs-pack.gz.squashfs, block size 131072.

[...]

Number of uids 2
	unknown (0)
	nixbld (987)
Number of gids 2
	unknown (0)
	nixbld (980)
Failed to read existing filesystem - will not overwrite - ABORTING!
--8<---------------cut here---------------end--------------->8---

I was able to reproduce it on a CentOS 7 system and to strace the
=E2=80=98mksquashfs=E2=80=99 process, and found that this had to do with ac=
cess to
SELinux extended attributes.

Fixed in commit 53c594cb3f1f783fea18be6da23a863b00c14f5f.

Thanks!

Ludo=E2=80=99.