Let gem install use Compact Index API only when present. #9314
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Feb 6, 2026
| ## | ||
| # Minimal CompactIndex implementation for tests. | ||
| # This is a simplified version that only implements what's needed for test fixtures. | ||
| module CompactIndexBuilder |
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I tried to use compact_index gem, but it is not possible to load external dependency on ruby-core CI. For now I have provided minimal implementation for now.
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While I was working on publishing some gems in private repositories, I have realized bundler already uses Compact Index API only when present, but gem commands sometimes not.
This is first change in chain to update gem commands (
gem installhere) to be able to use Compact Index API only when present. The change is simple, Compact Index API/info/:gemendpoint already provides all info needed to provide gemspec stub needed to resolve dependencies.I have added also (in separate commit) infrastructure for simple stub of Compact Index API (reusing same API as
spec_fetcher) and in last commit I have ported some basicgem installtests to use Compact Index API (as new default option).As a side-effect it is also faster. Running simple command like
GEM_HOME=/tmp/gem_test gem installwith empty GEM_HOME makes gem install 5s faster locally on my Linux (Fedora) computer.