Setting a Bundler version with GEM_PATH doesn't seem to work in Ruby
2.7, so we need to use the LOAD_PATH instead. Without this,
bundlerEnv environments will always use the version of Bundler that
comes with Ruby, which won't necessarily work because it isn't the
version that was used to generate the bundle.
For example, building ronn with Ruby 2.7 without this change results
in a broken executable, but it works (when built with all packaged
Ruby versions) after this change.
In building a gem whose native extension is a Rakefile, the previous
version of this code will call essentially `rake ""`, when it means to
call `rake`.
This change converts `""` into `[]` rather than `[""]`.
This fixes
nix-shell -p 'ruby.withPackages (const [])' ruby.devdoc
which otherwise wouldn't find documentation, unlike
nix-shell -p ruby ruby.devdoc
which would, because ruby has setup hooks to accomodate for this, that
were being masked by the withPackages wrapper.
Go beyond the obvious setup hooks now, with a bit of sed, with a skipped case:
- cc-wrapper's `dontlink`, because it already is handled.
Also, in nix files escaping was manually added.
EMP
Because the gemdir was referenced on the derivation, it would cause the
whole gemdir to get added to the store, which would in turn force the
derivation to be rebuilt whenever unrelated folder files would change.
The `gemset` field can be an attribute set as well in `buildRubyGem`,
however attribute sets can't be coerced to strings for the environment
set.
The impact should be relatively small as the environment variables are
only used by the `runCommand` script for `bunlderApp` which doesn't
refer to `gemset` at all.
This has two benefits:
- Anyone else using the `mathematical` gem will benefit from the config.
- The gem config overrides the default one, so we were losing the fixes
for other gems.
I had to change how the update script works. Now it looks at the `gems`
passthru from `bundlerApp`.
