Share gems between Ruby minor versions#502
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ASDF itself treats every install as a separate entity and does not have a concept of sharing data between installs. Luckily, Rubygems already provides such a concept through [`Gem.user_dir`](https://github.com/ruby/rubygems/blob/v4.0.12/lib/rubygems/defaults.rb#L103-L109) which holds a value like ```text /home/johndoe/.gem/4.0.0 ``` There are two features to note here: - Since ASDF will usually install everything into the user's home directory (i.e. `~/.asdf/`), we can do the same with the Ruby gems (by using `~/.gem`) without loss of generality. - While `RUBY_VERSION` changes with every Ruby release, the built-in value `RbConfig::CONFIG["ruby_version"]` stays the same for all versions of Ruby which are binary compatible. For example, all Ruby releases in the `3.4.X` series will have `3.4.0` as the value of `RbConfig::CONFIG["ruby_version"]`. So, in order to have communal gem homes for binary compatible releases of Ruby, all we need to do is to use `Gem.user_dir` as `GEM_HOME`. We set this value at runtime using `bin/exec-env` Fixes asdf-vm#119
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ASDF itself treats every install as a separate entity and does not have a concept of sharing data between installs.
Luckily, Rubygems already provides such a concept through
Gem.user_dirwhich holds a value likeThere are two features to note here:
~/.asdf/), we can do the same with the Ruby gems (by using~/.gem) without loss of generality.RUBY_VERSIONchanges with every Ruby release, the built-in valueRbConfig::CONFIG["ruby_version"]stays the same for all versions of Ruby which are binary compatible. For example, all Ruby releases in the3.4.Xseries will have3.4.0as the value ofRbConfig::CONFIG["ruby_version"].So, in order to have communal gem homes for binary compatible releases of Ruby, all we need to do is to use
Gem.user_dirasGEM_HOME. We set this value at runtime usingbin/exec-envFixes #119