Issue #168 wrap xcodebuild calls within ruby system environment

[lacostej]

This pull request aims to provide a safe wrapper.

The xcbuild-wrapper.sh originates from a gist linked from a stackoverflow, and was modified to make sure it works when:

1. using rvm
2. using rbenv
3. using system ruby under the following conditions:

export GEM_HOME=/Users/lacostej/.gem/ruby/2.0.0
export PATH=/Users/lacostej/.gem/ruby/2.0.0/bin:$PATH
gem install bundler
bundle install
fastlane ...

I suspect this is good enough and I don't need to use sudo to test the same thing.

[KrauseFx]

Any reason why we don't just run it directly from there?

[KrauseFx]

Instead of copying

[lacostej]

I originally meant it like that because of:

• cleaner command line
• easy to access the script to modify it and adapt it while developing
• similar to the way we install other wrapper scripts.

But I can see that this can cause problems with upgrades as is (it your newer version of gym contains an improved wrapper, it won't be copied over).

So I'll make it run in place instead. I'll fix it later today.

[KrauseFx]

Thanks for testing this. We'd need to test it on a System Ruby installation as well before we can merge it 👍

[claybridges]

My little gist done all growd up!

[KrauseFx]

Thanks @lacostej for preparing this. As this is taken from https://gist.github.com/claybridges/cea5d4afd24eda268164 via @claybridges we'd also need to be sure the license is okay.

@claybridges do you give permission to merge this in under the MIT license of fastlane?

[KrauseFx]

@lacostej There seems to be a merge conflict 😢

[lacostej]

Merge conflict was 9cda56e which had been fixed as de553c5 already. I just dropped it from the branch.

[lacostej]

WRT the gist license, @claybridges's gist went from 5 lines including shebang and enabling debugging to 14, so I hope it's not that of a blocker :)

While I am at it, there are probably other ways to implement this, like in pure ruby: https://github.com/pitluga/subcontractor/blob/master/lib/subcontractor/cli.rb#L9-L33

[claybridges]

Hi guys. I release this tiny script into the public domain with no copyright attachments whatsoever. Happy it's seeing some use.

[lacostej]

Merci @claybridges !

[KrauseFx]

Perfect, thanks @claybridges and @lacostej 🚀