conda: github-linguist tries to use ruby in rubygems directory

[sdruskat]

I managed to install github-linguist in conda (mamba 1.5.5, conda 23.11.0) on Ubuntu (WSL2), using this method:

mamba create -n ghl python=3.11
mamba activate ghl
mamba install compilers ruby libgit2=1.7.1 cmake pkg-config icu zlib
gem install github-linguist -- --use-system-libraries

🎉

Now, when running github-linguist . in a local git repo, I get an error:

<conda-envs>/ghl/share/rubygems/bin/github-linguist: 6: exec: <conda-envs>/ghl/share/rubygems/bin/ruby: not found.

I'm wondering why github-linguist is looking for a ruby binary in rubygems/?

FWIW: I can easily fix this doing ln -s <conda-envs>/ghl/bin/ruby <conda-envs>/ghl/share/rubygems/bin/ruby, but would like to understand why the error occurs in the first place...

Is this due to the way I installed ruby? Can I call ghl providing the ruby version to use? 🤷
Thanks for any pointers!

[lildude]

I have no idea what mamba is or how it works, but this sounds like something related to the gem environment which isn't setting the correct variables or some-such.

I use mise on macOS and my github-linguist command lands in $HOME/.local/share/gem/bin/github-linguist with this being the first line:

➜ head -1 /Users/lildude/.local/share/gem/bin/github-linguist
#!/Users/lildude/.local/share/mise/installs/ruby/3.3.3/bin/ruby
➜ 

This comes from the RUBY EXECUTABLE configuration in my gem environment:

➜ gem environment
RubyGems Environment:
  - RUBYGEMS VERSION: 3.5.11
  - RUBY VERSION: 3.3.3 (2024-06-12 patchlevel 89) [arm64-darwin23]
  - INSTALLATION DIRECTORY: /Users/lildude/.local/share/gem
  - USER INSTALLATION DIRECTORY: /Users/lildude/.gem/ruby/3.3.0
  - RUBY EXECUTABLE: /Users/lildude/.local/share/mise/installs/ruby/3.3.3/bin/ruby
  - GIT EXECUTABLE: /opt/homebrew/bin/git
  - EXECUTABLE DIRECTORY: /Users/lildude/.local/share/gem/bin
  - SPEC CACHE DIRECTORY: /Users/lildude/.cache/gem
  - SYSTEM CONFIGURATION DIRECTORY: /Users/lildude/.local/share/mise/installs/ruby/3.3.3/etc
  - RUBYGEMS PLATFORMS:
     - ruby
     - arm64-darwin-23
[... truncated for brevity ...]

I suspect your env isn't setting the correct RUBY EXECUTABLE.

A little bit of Googling led me to conda-forge/ruby-feedstock#116 which indicates you're not alone.

[sdruskat]

Thanks! I had had a look but didn't find the issue you dug out.
(And mamba is a faster re-implementation and drop-in replacement for conda.)