Improve check for systemd in a template for Fedora

[kaorimatz]

The /usr/bin/systemd symlink has been removed from the systemd package in Fedora Rawhide.

• http://pkgs.fedoraproject.org/cgit/systemd.git/commit/?id=c3b79820c74b69289284bcbdf5f5ebc359feae3b

Therefore, the current template script fails to find systemd on such a host.

# lxc-create -n test -t fedora -- --release=19
Host CPE ID from /etc/os-release: cpe:/o:fedoraproject:fedora:20
Checking cache download in /usr/local/var/cache/lxc/fedora/x86_64/19/rootfs ...
...
sed: can't read /usr/local/var/lib/lxc/test/rootfs/etc/rc.sysinit: No such file or directory
sed: can't read /usr/local/var/lib/lxc/test/rootfs/etc/rc.d/rc.sysinit: No such file or directory
sed: can't read /usr/local/var/lib/lxc/test/rootfs/etc/rc.sysinit: No such file or directory
sed: can't read /usr/local/var/lib/lxc/test/rootfs/etc/rc.d/rc.sysinit: No such file or directory
error reading information on service udev-post: No such file or directory
container rootfs and config created

I've created a patch to fix this problem.

[kaorimatz]

I think I understand the problem.
Maybe the guest needs to be configured based on whether the guest system is based on sysvinit or systemd.
In that case, the code may look like this:

if [ $release -gt 14 ]; then
  configure_fedora_systemd
else
  configure_fedora_init
fi

I'll try to send this PR as a patch to the lxc-devel mailing list.

Thank you for your review.

[stgraber]

The logic currently in the staging branch is to check for ${rootfs_path}/etc/systemd/system or ${rootfs_path}/etc/rc.sysinit which sounds sane to me assuming those do exist.

I see no reference to bin/systemd, so I'll consider this issue closed.