Support Ruby version in Gemfile

Languages Ruby
1

RVM can read required Ruby version from Gemfile.

https://rvm.io/workflow/projects#project-file-gemfile

But Travis ignores it.

https://travis-ci.org/minsk-hackerspace/hackerspace.by/builds/637122932#L190

Is it possible to add the support for it?

2

We do not fetch Gemfile when we receive the build request, only .travis.yml. So .travis.yml has to instruct us which Ruby version to use.

3

Well, this is not entirely accurate. You can use .ruby-version.

4

Actually I discovered that I can add Ruby version to Gemfile while troubleshooting the problem with .ruby-version.

If Ruby version is not specified explicitly, why not let RVM choose Ruby version like it does locally? Then it will not be necessary to maintain additional integration code.

I believe this default command prevents rvm from looking into Gemfile.

$ rvm use default

If it can be replaced with command that triggers default rvm behavior, then in presence of .ruby-version the following will be unnecessary too.

rvm use $(< .ruby-version) --install --binary --fuzzy
5

No, RVM shell integration is responsible for automatic version switch when you work locally. It overrides cd:

$ git clone https://github.com/travis-ci/dpl
<...>
$ cd dpl/
RVM used your Gemfile for selecting Ruby, it is all fine - Heroku does that too,
you can ignore these warnings with 'rvm rvmrc warning ignore /home/vmuser/dpl/Gemfile'.
To ignore the warning for all files run 'rvm rvmrc warning ignore allGemfiles'.

Unknown ruby interpreter version (do not know how to handle): >=2.2.
$ declare -f cd
cd () 
{ 
    __zsh_like_cd cd "$@"
}
$ grep ~ -rFe __zsh_like_cd
<...>
/home/vmuser/.rvm/src/rvm/scripts/extras/bash_zsh_support/chpwd/function.sh:function __zsh_like_cd()
<...>
1 Like
6

Is it possible to call rvm to just detect the version?

7

From what I can see, you can

source "$(dirname "$(which rvm)")/../scripts/rvm"

and it will autodetect the version.