Make it possible to install critic on Mac

[rchl]

I don't have much experience with critic installation process (only tried it on Linux) and not that much in Mac itself, but I'd really like to be able to install it there.

I have a Mac so I can contribute or maybe even do it myself, but having someone willing to help would be nice too.

[rchl]

os.getresuid() is not available on Mac.

Traceback (most recent call last):
  File "install.py", line 113, in <module>
    cwd=installation.root_dir).strip():
  File "/Users/rchlodnicki/workspace/critic/installation/utils.py", line 116, in run_git
    return subprocess.check_output(args, **kwargs)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/contextlib.py", line 24, in __exit__
    self.gen.next()
  File "/Users/rchlodnicki/workspace/critic/installation/utils.py", line 280, in as_effective_user_from_path
    os.seteuid(os.getresuid()[0])
AttributeError: 'module' object has no attribute 'getresuid'

[jacobrask]

While not exactly the same thing, I got Critic running in Docker on my Mac. Docker is a light weight Linux runtime, and on Mac also includes a VM with very little overhead.

I manage it through a little shell script that will install, start and update/upgrade Critic. This script should work just the same on Linux, but I haven't tried it there.

On Mac, install Docker + Boot2Docker. They are available as homebrew recipes:

brew install docker
brew install boot2docker

boot2docker init
boot2docker up
boot2docker shellinit

Then use critic-docker:

cd critic
critic-docker install
critic-docker run

hack, commit

critic-docker update

One caveat is that you currently can't specify a custom postgres host/port as an installation parameter, and I didn't bother to fix that, so you need to add "host": "postgres" to data["installation.database.parameters"] in installation/database.py. (In the critic-docker setup, postgres is run in a separate Docker container exposed with the hostname postgres to the main Critic container.)

[jjgod]

See isislovecruft/python-gnupg#28