Ensure the lxc templates are executable prior to lxc-create

[smaftoul]

While creating my own vagrant-lxc box, I ran VAGRANT_LOG=DEBUG vagrant up --provider lxc and noticed the following in the log:

INFO subprocess: Starting process: ["/usr/bin/sudo", "cp", "/root/.vagrant.d/boxes/vagrant-lxc-lucid-i386-base.test/lxc/lxc-template", "/usr/share/lxc/templates/lxc-vagrant-tmp-root_default-1375807729"]

Later the command failed to run with:

here was an error executing ["sudo", "lxc-create", "--template", "vagrant-tmp-root_default-1375807729", "--name", "root_default-1375807729", "-f", "/root/.vagrant.d/boxes/vagrant-lxc-lucid-i386-base.test/lxc/lxc.conf", "--", "--tarball", "/root/.vagrant.d/boxes/vagrant-lxc-lucid-i386-base.test/lxc/rootfs.tar.gz", "--auth-key", "/opt/vagrant/embedded/gems/gems/vagrant-1.2.7/keys/vagrant.pub"]

I managed to solve the problem with a missing chmod +x lxc-template, but I think we don't need to copy the template in /usr/share/lxc/templates.

As stated in lxc-create manpage in the "-t" section:
Alternatively, the full path to an executable template script can also be passed as a parameter.

Is this right ? Can we make lxc-create work without copying the template ?

[fgrehm]

@smaftoul the problem is that it won't work under Ubuntu 12.04 / 12.10 as "their lxc"s do not support the full path to the template, only on 13.04 =/
I think we can just make sure that we run a chmod +x after copying the template and prior to lxc-create, I've maked this issue as an Enhancement and updated the title to reflect that :)