[Mikola Lysenko (mikolalysenko)]

LLM Description written by Claude Code:claude-opus-5-5

Fixes #1749

Problem

Bundler 1.17–2.1 lock every rubygems remote into one merged GEM section. When two gems are hosted, that section lists two Socket patch-registry remotes. Gem lockfile discovery gave up on such a section:

• manifest-less vex found no patch refs and exited 2 (patched_ref_unattributable, then manifest_not_found)
• an in-sync scan --mode hosted skipped both gems as redirect_unattributable, and still exited 0
• a superseding patch for either gem was skipped the same way on every run, so the project stayed on the older patch

Root cause

hosted_wiring in crates/socket-patch-core/src/vex/discover/gem.rs attributed a merged section only when it held exactly one Socket remote (socket_count == 1), and only ever returned the first Socket remote's wiring (socket.into_iter().next()?). The scan's pre-write discovery check vetoed the rewrite before refresh_merged_gem_lock_remote, which already handles several remotes, could run.

Change

• hosted_wirings returns one wiring per Socket remote of a section. In a merged section each remote gets the gems source-pinned to it: ! in DEPENDENCIES, a Gemfile source "<that remote>" do block, and no block for another source. That last rule also keeps a gem declared under two Socket remotes from being attributed to either.
• A Socket remote with no pinned gem is diagnosed ref_unattributable on its own, and no longer hides the section's other Socket remotes.
• A merged-section Socket remote that is not a patch-registry index is now ref_invalid, as in a single-remote section. Before, it was misreported as an unpinned gem.
• A merged remote whose pinned gems the section does not lock now gets a ref_unattributable diagnostic instead of silently yielding nothing.
• The module docs are updated. The CLI_CONTRACT.md gem row already describes the cross-check without a remote count, so it is unchanged.
• The npm, pypi and gem wrappers only dispatch to the binary, so they needed no change.

Tests (red → green)

Test	Covers	Without the fix
vex::discover::gem::tests::merged_section_attributes_each_socket_remote	the issue's exact lock shape: two Socket remotes, both gems pinned → two refs, each tied to its own remote	fails: no refs
vex::discover::gem::tests::merged_section_unpinned_socket_remote_is_diagnosed_alone	partial pinning; a gem in blocks for both remotes; a non-index remote; a pinned gem missing from the section	fails
e2e gem_hosted_two_gems_rescan_supersede_and_attest (real bundler)	two hosted gems → bundle install → one merged section on 2.1; an in-sync re-scan changes nothing and skips nothing; manifest-less vex attests both; a superseding patch for one gem lands in the Gemfile and the lock; a cold checkout installs frozen	fails at the re-scan with redirect_unattributable ×2, the issue's symptom

merged_section_without_a_full_source_pin_is_unattributable drops its "two Socket remotes" case. That case asserted the old all-or-nothing behavior, which is the bug. The new tests above cover the case instead.

Per-issue checklist:

• Hosted gem on Bundler < 2.2 locks: once two gems are redirected, vex finds no patch refs and every re-scan skips both gems as redirect_unattributable (exit 0), so superseding patches never land #1749 re-scan → e2e re-scan step and unit merged_section_attributes_each_socket_remote
• Hosted gem on Bundler < 2.2 locks: once two gems are redirected, vex finds no patch refs and every re-scan skips both gems as redirect_unattributable (exit 0), so superseding patches never land #1749 vex → e2e vex step (both purls attested (redirected))
• Hosted gem on Bundler < 2.2 locks: once two gems are redirected, vex finds no patch refs and every re-scan skips both gems as redirect_unattributable (exit 0), so superseding patches never land #1749 supersede → e2e generation-3 step

Commands run locally

• cargo fmt --all -- --check: clean
• cargo clippy --workspace --all-features -- -D warnings: clean
• e2e_redirect_gem_build with --ignored and SOCKET_PATCH_BUNDLER_E2E_REQUIRED=1: 34/34 on bundler 2.1.4 and on 4.0.18. The new test alone also passes on 2.5.22.
• e2e_vendor_gem_build with --ignored: 9/9 on 2.1.4 and on 4.0.18
• cargo test -p socket-patch-core --all-features --no-fail-fast: 7457 passed, 4 failed. The 4 are copy_tree::relax_loop_must_not_traverse_symlinked_root, vlt_heal::an_unremovable_hidden_lock_keeps_every_store_entry, pypi_poetry::wire_write_failure_… and pypi_requirements::wire_failure_…. They are chmod-based tests that can't fail when run as root in this sandbox, and this PR doesn't touch their code (same 4 as noted on Fix hosted cargo dotted-key and literal pins (#757) #1743).
• cargo test -p socket-patch-cli --all-features --lib --bins: 935 passed
• The full cargo test --workspace --all-features build ran out of the sandbox's disk allowance, so the CLI integration suites are left to CI. This PR changes only gem discovery and one gem e2e file.
• Bundler 1.17.3 was not run locally: it needs Ruby ≤ 3.1, and this sandbox has 3.3. The CI leg covers it.

/code-review high

Fixed: the non-index remote misdiagnosis and the double is_patch_registry_index call; the silent no-ref merged wiring; per-uuid diagnostic assertions; the frozen install now runs on a cold checkout; the docs wrap and wording.
Not fixed: the generation-fixture setup duplicated from gem_hosted_superseding_patch_keeps_gem_sections_in_bundler_order. A shared helper would touch an unrelated test, and the copy is test-only.

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[Mikola Lysenko (mikolalysenko)]

BugBot review

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[cursor]

✅ Bugbot reviewed your changes and found no new issues!

Comment @cursor review or bugbot run to trigger another review on this PR

^{Reviewed by Cursor Bugbot for commit 7b6a9ea. Configure here.}

[Mikola Lysenko (mikolalysenko)]

Burn-down agent: labeled Ready for review at head 7b6a9ea.

• CI: 82/82 checks green (32 success, 50 skipped) on 7b6a9ea; no main-wide failures.
• Bugbot: reviewed 7b6a9ea, no findings; no open review threads.
• Reviewer focus: crates/socket-patch-core/src/vex/discover/gem.rs now attributes every Socket remote in a merged GEM section, plus the new e2e in e2e_redirect_gem_build.rs.

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Generated by Claude Code

[Mikola Lysenko (mikolalysenko)]

Final review brief

What it does. Bundler 1.17–2.1 lock every rubygems remote into one merged GEM section. With two hosted gems that section lists two Socket patch-registry remotes, and gem discovery gave up on the whole section, so vex exited 2 and the hosted re-scan skipped both gems as redirect_unattributable (#1749). Discovery now attributes each Socket remote on its own, to the gems source-pinned to it (! in DEPENDENCIES plus a Gemfile source … do block for that remote and no other).

Risk: low–medium. The change is confined to gem lockfile discovery and stays fail-closed: a gem declared in blocks for two Socket remotes is attributed to neither. Two diagnostics change on purpose. A non-index Socket remote in a merged section is now ref_invalid (it was misreported as unattributable), and a pinned gem missing from the section is now diagnosed instead of silently dropped. The medium part: CI's bundler 1.17.3/2.1.4 legs (e2e-extended) run only on schedule or dispatch, not on PRs or in the merge queue, so CI here exercised the new e2e only on bundler 4.0.21, which doesn't produce a merged section. I ran it on 2.1.4 myself (below).

Look here

• crates/socket-patch-core/src/vex/discover/gem.rs:501-579: hosted_wirings, one wiring per Socket remote, and the per-remote pin rule
• crates/socket-patch-core/src/vex/discover/gem.rs:424-474: section_refs, which adds the new "pinned but not locked" diagnostic
• crates/socket-patch-core/src/vex/discover/gem.rs:1344-1480:`` the two new unit tests, which cover partial pins, a gem pinned to both remotes, a non-index remote and a missing spec
• crates/socket-patch-cli/tests/e2e_redirect_gem_build.rs:2321:``` the real-bundler e2e (re-scan, vex, supersede, frozen cold install)

Verified

• Read the full diff (2 files, +472/−100). CHANGELOG.md is untouched. No debug leftovers.
• cargo test -p socket-patch-core --all-features --lib vex::discover::gem: 27/27 passed.
• gem_hosted_two_gems_rescan_supersede_and_attest passed on real bundler 2.1.4, the merged-section era, with SOCKET_PATCH_BUNDLER_E2E_VERSION=2.1.4 and …_REQUIRED=1, so the version is asserted.
• CI on 7b6a9ea: 32 success, 50 path-skipped, 0 failed. Bugbot: no issues. No unresolved threads.

Open questions: none that block merging. Bundler 1.17.3 is covered only by the next scheduled e2e-extended run.

Auto-merge is armed, so approving sends it straight to the merge queue.

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