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…finds its binstub
RubyGems writes a gem's binstubs to Gem.bindir, which for IronRuby is the
directory ir itself is in (RbConfig's bindir, Src/Console/bin/<config>/<tfm>).
ir.sh only put Src/StdLib/bin - the executables the bundled library ships -
on RUBYPATH, so `./ir.sh -S doom` after `./igem.sh install doom` never saw
the binstub RubyGems had just written for it. It took the first `doom` on
PATH instead; on a machine with a version manager that is a native shim,
which ir then tried to run as a Ruby script ("invalid multibyte character
0xCF (SyntaxError)").
The directory of ir comes after Src/StdLib/bin and before PATH, so a
binstub installed for IronRuby wins over a host Ruby's command of the same
name - the rule the irb entry already follows - and an existing RUBYPATH
still wins for anything not here.
This was referenced Oct 13, 2026
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CI builds libprism from prism's main branch, and since ruby/prism#4255 (attach_comments, merged 2026-10-12) every build job has failed in the smoke test with "Unknown prism node type: 0 (TypeError)" - master, Largo#17, Largo#18 and Largo#19 alike. That change altered prism's serialization in two places without moving the serialization version off 1.9, so the version check in PrismLoader could not catch it: - the options blob has a new attach_comments byte after freeze. The blob IronRuby wrote was one byte short, so prism read the scope count from the wrong offset; - the serialized header has a comment-attachment list after the comments (node id, count, comment indices). PrismLoader read its count as the magic comment count and walked off from there. PrismParser.BuildOptionsData writes the byte (0: IronRuby never asks for attachments) and PrismLoader.Load skips the list. PrismLex only reads the token stream, which ends before the header, so it needs nothing. The rest of the revision comes along so that every piece names the same prism commit, as Src/Prism/README.md asks: - Src/Prism/Generated is regenerated from cd76b0d1's config.yml: SymbolNode#value_loc became the non-optional content_loc (the bridge reads neither), and a WORDS_SEP_IMPLICIT token was added after WORDS_SEP. Ripper looks tokens up by name and skips the ones it has no event for, which is what prism's own lex_compat does with this one. - Src/StdLib/ruby/4.0/prism is prism's lib/ at cd76b0d1, generated files included; prism.rb keeps IronRuby's backend branch. parse_result/comments.rb is gone upstream - attaching comments moved into libprism. - Src/StdLib/ironruby/prism/ironruby.rb follows ffi.rb: attach_comments is a known option and is dumped after freeze, and the *_file APIs take a Pathname (to_path / to_str) the way PrismSource.with_file now does. - release.yml's PRISM_REF and the README build instructions move to cd76b0d1.
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The title clearly and specifically describes the main change: adding RubyGems' bindir to RUBYPATH so ir -S can find gem executables. |
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Review comments at @ir.sh:
- Line 68: Update the RUBYPATH assignment so existing RUBYPATH entries remain
ahead of the newly added directory, while preserving the existing S/bin
precedence and ensuring the IronRuby bin directory is still included.
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"An existing RUBYPATH still wins for anything not here" read as if the caller's RUBYPATH came first. It comes after Src/StdLib/bin and RubyGems' bindir - IronRuby's own commands first, the order Src/StdLib/bin has always had and ir.cmd uses - and ahead of PATH.
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RubyGems writes a gem's binstubs to
Gem.bindir, which for IronRuby is the directoryiritself is in (RbConfig's bindir,Src/Console/bin/<config>/<tfm>;igem envreports it as EXECUTABLE DIRECTORY).ir.shonly putSrc/StdLib/bin- the executables the bundled library ships - onRUBYPATH, so after./igem.sh install doom,./ir.sh -S doomnever saw the binstub RubyGems had just written for it.It took the first
doomonPATHinstead. On a machine with a version manager (mise, rbenv, asdf) that is a native shim, whichirthen tried to run as a Ruby script:With this change the directory of
ircomes afterSrc/StdLib/binand beforePATH, so a binstub installed for IronRuby wins over a host Ruby's command of the same name - the rule theirbentry already follows - and an existingRUBYPATHstill wins for anything not here.-Sresolution itself (RubyOptionsParser.FindMainFileFromPath, RUBYPATH then PATH) is unchanged.Tested on arm64 macOS, .NET 10:
./igem.sh install doom && ./ir.sh -S doom --benchruns the gem's own binstub.Summary by CodeRabbit
-Scommand can now find executables installed through RubyGems for the selected IronRuby installation. These are searched after IronRuby’s standard library tools and before configured Ruby paths and the system PATH. This makes gem-installed commands available through IronRuby’s command lookup.