From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?UTF-8?Q?Court=C3=A8s?=)
Subject: bug#18994: Daemon does not preserve supplementary groups of build
	users
Date: Sat, 08 Nov 2014 15:01:43 +0100
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To: 18994@debbugs.gnu.org

Currently, the build environment made by the daemon does not preserve
supplementary groups of the build users.

Thus, even though the standalone Guix system sets /dev/kvm 660, owned by
root:kvm, and adds the build users to the kvm group, build users are
unable to access it.

This can be see with:

  (gexp->derivation "foo"
    #~(begin (mkdir #$output)(pk (stat:gid (stat "/dev/kvm")) (getgroups))))

The workaround for now is to make /dev/kvm 666.

Ludo=E2=80=99.