Extra lxc.mount.auto entry being added to config file

[Christopher Townsend]

I'm using the Python API to append entries to the LXC config file. When I do the following:

container.set_config_item("lxc.mount.auto", "cgroup:mixed")

I get an extra lxc.mount.auto entry in the config file. This is what it looks like:

lxc.mount.auto =
lxc.mount.auto = cgroup:mixed

This keeps the container from starting. I have to remove the first lxc.mount.auto to get the container to start.

Also, this seems to have started fairly recently.

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: lxc 1.1.0~alpha2-0ubuntu2
ProcVersionSignature: Ubuntu 3.16.0-21.28-generic 3.16.4
Uname: Linux 3.16.0-21-generic x86_64
ApportVersion: 2.14.7-0ubuntu5
Architecture: amd64
CurrentDesktop: Unity
Date: Wed Oct 8 16:40:40 2014
SourcePackage: lxc
UpgradeStatus: Upgraded to utopic on 2014-06-16 (114 days ago)
defaults.conf:
 lxc.network.type = veth
 lxc.network.link = lxcbr0
 lxc.network.flags = up
 lxc.network.hwaddr = 00:16:3e:xx:xx:xx

[Serge Hallyn (serge-hallyn)]

Thanks for submitting this bug

 status: confirmed
 importance: high

[Stéphane Graber (stgraber)]

Hey Chris,

This is a parser bug which we need to fix. I believe Serge is looking into it.

In the mean time, try using append_config_item instead which may work fine in this case (so long as it's not called multiple times, otherwise you'll get duplicates).

[Serge Hallyn (serge-hallyn)]

A proposed fix has been sent to the mailing list, and will probably be applied in utopic today. In the meantime you can work around this by using the 'append_config_item' method instead of set_config_item. (Note that the C API does not have this same behavior, so this is only for the python bindings)

[Launchpad Janitor (janitor)]

This bug was fixed in the package lxc - 1.1.0~alpha2-0ubuntu3

---------------
lxc (1.1.0~alpha2-0ubuntu3) utopic; urgency=medium

  * fix usernic and apparmor-mounts tests to not clear out the host's
    /etc/lxc/lxc-usernet
  * fix unprivileged containers when user's cgroup paths are not all
    equivalent, and add a testcase for that.
  * fix broken behavior when configuration has 'lxc.mount.auto ='
    (LP: #1379030)
 -- Serge Hallyn <email address hidden> Thu, 09 Oct 2014 12:25:16 -0500