Subprocessed being interrupted resulted in it looking
like those commands were executing successfully but with
zero output. Interrupting the sudo prompt would result
in any command running in sudo returning nothing and looking
like it had succeeded. There was some clean up code in
the lxc provider that nuked vagrant container state in
the .vagrant directory if it looked like the container no
longer existed based on the result of lxc-ls. Interrupting
this check resulted in it looking like the container not
existing, resulting in the provider code nuking the lxc dir
in .vagrant. Voila
The previously hardcoded lxc path prevented the sudo wrapper from
working in environment with alternative `lxcpath`.
I had to move `sudo_wrapper` from `provider` to `LXC` because the
concept of "provider" is tied to a machine when a command sush as
`sudoers` is not.
Fixes#413 and #399
On Vagrant 1.9+ plugin gems are installed into a different folder, their path
containing the ruby version. This updates the regular expression whitelisting
the pipework script to reflect this change.
If LXC commands are run with a restrictive umask like 027 or 077, then
the root directory of new containers will lack read `r` and access `x`
permission for non-root users. The first failure to result from this
during `vagrant up` is that the SSH daemon cannot read the crucial file
`/home/vagrant/.ssh/authorized_keys` after it drops privileges to the
level of the `vagrant` user. The result is the familiar:
```
default: Warning: Authentication failure. Retrying...
default: Warning: Authentication failure. Retrying...
Timed out while waiting for the machine to boot. This means that
Vagrant was unable to communicate with the guest machine within
the configured ("config.vm.boot_timeout" value) time period.
```
So we should make sure that we run all LXC commands with a umask that at
least does not prevent group and world `r` and `x` bits from being set
in newly created files and directories.
