New images will ship a `device-type.json` file in the first partition,
which we can use instead of querying the API for certain configuration
and initialisation commands.
If the file is not found, or is malformed, we still fallback to the API.
Signed-off-by: Juan Cruz Viotti <jviotti@openmailbox.org>
Currently, the fact that `os initialize` requires elevated permissions
forced us to require calling commands that reuse it, such as `device
init` and `quickstart` with administrator permissions as well.
This ended up causing issues like saving images in the cache that belong
to root, or initializing git repositories that requires `sudo` to
commit.
The solution is to call `os initialize` as a child process preppending
`sudo` within `device init`.
Fixes: https://github.com/resin-io/resin-cli/issues/109
- Add helpers.confirm() to abstract the process of asking for
confirmation.
- Add helpers.selectDeviceType() to abstract the form needed to ask for
device types.
The functions on this module are reused by app actions.
