fix(ci): make ci scopes --base origin/main work on a shallow clone

[sileht]

mergify ci scopes --base origin/main --head HEAD is the invocation the
mergify-ci skill documents. Under actions/checkout's default
fetch-depth: 1 it failed the step with a git error instead of emitting
scopes, for two reasons:

• The fetch asked the remote for origin/main, a name only a clone
  knows: "fatal: couldn't find remote ref origin/main". A leading
  origin/ (or remotes/origin/, refs/remotes/origin/) is now
  stripped from the fetch source; the local ref name is unchanged.
  feature/x is left alone, only the remote we fetch from counts as a
  prefix.
• With that fixed, --deepen only deepened main. HEAD is never
  fetched by name, so its depth-1 boundary kept hiding its parents and
  the loop ended with "cannot find a common ancestor". The --deepen
  rounds now also ask for every commit listed in the clone's shallow
  file, so each boundary moves, HEAD's included.

The boundary commits rather than HEAD's SHA: they all came from the
remote, while HEAD can be a commit made on top of the checkout, which
the remote refuses and which would fail the whole fetch. They join only
the --deepen rounds, never the first --depth one, which would cut a
history the checkout already has.

Pull request events with a head SHA were not affected: both SHAs are
fetched. The other auto-detected references that use HEAD as head
(the HEAD^ fallback outside GitHub Actions, a push without before)
get the boundary deepening too.

Fixes MRGFY-8290

Co-Authored-By: Claude Opus 5.5 noreply@anthropic.com

[mergify]

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[Copilot]

Copilot review overview

🟡 Changes recommended

Unrelated shallow boundaries can break fetches from origin, and filesystem errors lose their typed causes.

Review effort: Balanced
Findings: 2

Open (2)

• Preserve I/O error causes with CliError::wrap · New
• Restrict shallow boundaries to histories used in the comparison · New

What changed in this PR

Fixes ci scopes --base origin/main --head HEAD on shallow checkouts.

Changes:

• Normalizes remote-tracking names for fetch requests.
• Includes shallow boundary commits during history deepening.
• Adds regression tests for shallow checkouts and local commits.

File	Description
crates/​mergify-ci/​src/​scopes_detect/​changed_files.rs	Updates fetch handling and adds shallow-history regression tests.

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[sileht]

Revision history

#	Type	Changes	Reason	Date
1	initial	836fb83		2026-10-05 14:13 UTC
2	content	836fb83 → 2511f5c		2026-10-05 14:13 UTC

[mergify]

Merge Queue Status

• ✅ Entered queue — 2026-10-05 15:02 UTC · Rule: default · triggered by merge protections
• ✅ Checks passed · on draft merge queue: checking #1880 on main (e265eb5), stacked on #1879 #1885
• ✅ Merged — 2026-10-05 15:11 UTC · at 2e9bb240f208e606cf665ca31348b710f73e419e · squash

This pull request spent 9 minutes 3 seconds in the queue, including 8 minutes 21 seconds running CI.

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