[rubygems/rubygems] Fix crash when installing gems with symlinks

If BUNDLE_PATH is configured to a symlinked path, installing gems with
symlinks would crash with an error like this:

```
Gem::Package::SymlinkError: installing symlink 'man/man0/README.markdown' pointing to parent path /usr/home/stevewi/srv/mail/lib/tools/.vendor/ruby/3.1.0/gems/binman-5.1.0/README.markdown of /srv/mail/lib/tools/.vendor/ruby/3.1.0/gems/binman-5.1.0 is not allowed
```

This commit fixes the problem by changing the bundle path to be the
realpath of the configured value, right after we're sure the path has
been created.

https://github.com/rubygems/rubygems/commit/3cd3dd142a

3 files changed, 3 insertions, 11 deletions

diff --git a/lib/bundler/inline.rb b/lib/bundler/inline.rb
index db1ca2de65..8ef580f1f0 100644
--- a/lib/bundler/inline.rb
+++ b/lib/bundler/inline.rb
@@ -38,6 +38,7 @@ def gemfile(install = false, options = {}, &gemfile)
   raise ArgumentError, "Unknown options: #{opts.keys.join(", ")}" unless opts.empty?
 
   begin
+    Bundler.instance_variable_set(:@bundle_path, Pathname.new(Gem.dir))
     old_gemfile = ENV["BUNDLE_GEMFILE"]
     Bundler::SharedHelpers.set_env "BUNDLE_GEMFILE", "Gemfile"
 
diff --git a/lib/bundler/installer.rb b/lib/bundler/installer.rb
index 915a04c0dc..f195d36600 100644
--- a/lib/bundler/installer.rb
+++ b/lib/bundler/installer.rb
@@ -66,7 +66,7 @@ module Bundler
     # require paths and save them in a `setup.rb` file. See `bundle standalone --help` for more
     # information.
     def run(options)
-      create_bundle_path
+      Bundler.create_bundle_path
 
       ProcessLock.lock do
         if Bundler.frozen_bundle?
@@ -262,15 +262,6 @@ module Bundler
       end
     end
 
-    def create_bundle_path
-      SharedHelpers.filesystem_access(Bundler.bundle_path.to_s) do |p|
-        Bundler.mkdir_p(p)
-      end unless Bundler.bundle_path.exist?
-    rescue Errno::EEXIST
-      raise PathError, "Could not install to path `#{Bundler.bundle_path}` " \
-        "because a file already exists at that path. Either remove or rename the file so the directory can be created."
-    end
-
     # returns whether or not a re-resolve was needed
     def resolve_if_needed(options)
       if !@definition.unlocking? && !options["force"] && !Bundler.settings[:inline] && Bundler.default_lockfile.file?
diff --git a/lib/bundler/source/rubygems.rb b/lib/bundler/source/rubygems.rb
index b37bfbccb9..5dceacbae4 100644
--- a/lib/bundler/source/rubygems.rb
+++ b/lib/bundler/source/rubygems.rb
@@ -499,7 +499,7 @@ module Bundler
       end
 
       def rubygems_dir
-        Bundler.rubygems.gem_dir
+        Bundler.bundle_path
       end
 
       def default_cache_path_for(dir)