This commit adds some better handling around the snapshot restore and
delete commands for the virtualbox provider. If a user attempts to restore from
a vm that does not exist, instead of exiting 0 it will raise an
exception saying the virtual machine has not been created yet.
Addtionally, if a user attempts to restore from a snapshot id that does
not exist, instead of printing a complicated exception from the
virtualbox cli tool, it prints a more useful error message telling the
user that the snapshot does not exist.
Whenever the path where the machine was first created changes, Vagrant
will now show just one warning when an action is run on the machine.
The idea is that if a user copies the machine over to a different
directory with the idea of running two different machines, this warning
will now help the user determine how to make that work.
Prior to this commit, if a user ran the `vagrant ssh -c CMD` command, it
would not allow the user to configure pseudo-terminal allocation. This
commit introduces a -t flag for the `vagrant ssh` command which defaults
to true if not specified.
Prior to this commit, if a user set a URL for the name of a box, vagrant
would not warn the user about using box_url instead. This would lead to
some difficult user experiences around the various box commands due to
the box name being a full URL. This commit introduces a warning to the
user and lets them know to instead use box_url.
Prior to this commit, if a user attempted to use the `vagrant snapshot
save` or `vagrant snapshot list` commands on a vm whose provider did not
support snapshots, it would simply print a warning. This commit changes
that behavior by instead raising an error.
Prior to this commit, the vagrant snapshot plugin would save snapshots
with existing names which lead to duplicate snapshot names being saved.
This commit fixes that by checking to see if the given snapshot name
already exists and if so, fails telling the user the given snapshot name
already exists. If a user passes a --force flag, vagrant will first
delete the existing snapshot, and take a new one with the given name.