travis-cargo 0.1.3: --no-sudo

I just pushed travis-cargo version 0.1.3, which adds a --no-sudo command to the coveralls and coverage subcommands to allow recording/uploading test coverage without needing sudo.

This is based⁰ on @seanmonstar’s investigation/implementation of sudo-less kcov. It works because Travis’s apt addon has whitelisted everything necessary. Unfortunately, it does require these to be installed explicitly, which seems to be something travis-cargo can’t do itself: they seem to have to be explicitly listed in the manifest.

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addons:
  apt:
    packages:
      - libcurl4-openssl-dev
      - libelf-dev
      - libdw-dev

This allows leveraging Travis’ container-based infrastructure, with all its benefits, especially around speed and latency. If you switch¹, you can check that your builds are using it by looking for the following paragraph in the build-logs:

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This job is running on container-based infrastructure, which does not allow use of 'sudo', setuid and setguid executables.
If you require sudo, add 'sudo: required' to your .travis.yml
See http://docs.travis-ci.com/user/workers/container-based-infrastructure/ for details.

--no-sudo is opt-in because it’d be a breaking change to do anything else, and because adding sudo: required is simpler than the whole addons: apt: ... thing.