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87 ruby/* gems test Ruby < 3.2 on ubuntu-latest, which setup-ruby can't provide once it points to ubuntu-26.04 #156
Description
ubuntu-latest is moving to ubuntu-26.04 (actions/runner-images#14748, rolled out until November 19), and ruby/setup-ruby only ships Ruby 3.2 and newer for that image:
Error: Unavailable version 3.1.7 for ruby on ubuntu-26.04
87 repositories of the org call ruby_versions.yml with a min_version below 3.2 and test on ubuntu-latest, so their older-Ruby jobs will fail at setup as soon as their runner flips. None has failed yet: their last runs were on 24.04.
ruby_versions.yml can't fix this on its own since runs-on lives in each caller, but the change there is one line. The generated versions are strings, which GitHub compares as numbers, and head/truffleruby become NaN, so they keep ubuntu-latest. I checked it on a throwaway workflow fed by fromJson: 2.5, 3.0 and 3.1 go to ubuntu-24.04, while 3.2, 4.0, head, jruby and truffleruby stay on ubuntu-latest, and macOS and Windows jobs are untouched:
runs-on: ${{ matrix.os == 'ubuntu-latest' && matrix.ruby < 3.2 && 'ubuntu-24.04' || matrix.os }}The 87 repositories
base64, benchmark, bigdecimal, bigdecimal, cgi, cmath, csv, date, dbm, debug, debug, delegate, did_you_mean, digest, drb, etc, fcntl, fileutils, find, forwardable, gdbm, getoptlong, iconv, io-console, io-nonblock, ipaddr, irb, json, logger, lrama, mathn, matrix, mutex_m, net-ftp, net-http, net-pop, net-protocol, net-smtp, nkf, observer, open-uri, open3, openssl, optparse, ostruct, power_assert, pp, prettyprint, prime, pstore, psych, psych, racc, rake, readline-ext, reline, repl_type_completor, resolv, rexml, rinda, rss, ruby2_keywords, rubygems-mirror, scanf, sdbm, securerandom, shell, shellwords, singleton, stringio, strscan, syck, sync, syslog, tempfile, test-unit-ruby-core, time, timeout, tmpdir, tracer, tsort, uri, weakref, webrick, win32-registry, yaml, zlib
Found by reading each caller's min_version and runs-on; erb and pathname have no min_version and aren't counted.
Would you rather roll this out yourselves across the org, handle it in ruby_versions.yml somehow, or should I send the one-line change to some of these repositories?
Activity
hsbt commentedon Oct 31, 2026
I'd rather fix this in ruby-builder, so I opened ruby/ruby-builder#31 to build Ruby 3.1 and older for
ubuntu-26.04. Please follow that PR instead of sending the one-line change.czj commentedon Oct 31, 2026
Thanks @hsbt, fixing it in ruby-builder is much better than patching 87 workflows. I'll follow ruby/ruby-builder#31 and won't send the one-liners. Could this be closed once it lands?
Pin the ubuntu jobs to ubuntu-24.04
hsbt commentedon Nov 3, 2026
setup-ruby now provides Ruby 2.3 through 3.1 on ubuntu-26.04, with the fix landing in ruby-build (rbenv/ruby-build#2649 and rbenv/ruby-build#2651) rather than ruby/ruby-builder#31. Ruby 2.2 and older won't be built, and ruby2_keywords, the only caller testing them, now runs on ubuntu-24.04 (ruby/ruby2_keywords#68). Thanks for the report.