api: merge/preview ignores strategy, squash and allow_unrelated_histories
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评估
调研方向
Start by comparing the /repos/merge/preview and v1 handlers with the /merge route’s decision code, then trace how each route reads strategy, squash, and allow_unrelated_histories. Add tests for the listed cases that compare preview results with the merge route’s answer, including the unrelated histories response. Done means the preview matches the merge route for each parameter combination.
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描述
Problem
Spec 5d8e1801 says GET /repos/merge/preview (and v1) gives the result POST /merge would give with the same strategy, squash and allow_unrelated_histories, adds the results squash and rejected, and documents 412 for unrelated histories. SDK 0.1.2 sends all three.
We read none of them. Live at 3af232d9: strategy=merge gave fast_forward (upstream: merge_commit), squash=true gave fast_forward (upstream: squash), ff_only on diverged branches gave merge_commit (upstream: rejected), and unrelated histories gave 200 merge_commit (upstream: 412).
Desk decision
Read the three params and compute the preview with the same decision code POST /merge uses, so the two cannot drift. Test each case against the merge route's own answer.
Severity
Medium: a client that previews before merging gets a wrong prediction.
Upstream audit 2026-11-12, evidence 2026-11-12-1159UTC. Docs spec 5d8e1801 (ETag W/"8GUlAlKU8eko7Rr2", Last-Modified 2026-11-10 22:29:59 GMT). The cluster still serves ee8092bf, so this is documented drift, not a proven deployment (#234 rule: adopt what the docs publish). SDK 0.1.1 (Nov 10) and 0.1.2 (Nov 11) shipped on npm, PyPI and Go; their route list and token minting are unchanged from 0.1.0.
Generated with xum • Model: anthropic:claude-opus-5-5 • Thinking: medium
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