Import AITURK IDE 1.0.0-beta.1 from Hermes 63279301; preserve MIT license
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name: History Check
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# Rejects PRs whose branch has no common ancestor with main.
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#
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# In May 2026 PR #25045 was merged from a branch that had been disconnected
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# from main's history (likely an accidental `git checkout --orphan` or
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# `.git/` re-init). GitHub's merge UI does not refuse merges of unrelated
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# histories, so the PR landed cleanly with the intended one-file change —
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# but its parent-less root commit (413990c94) got grafted into main as a
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# second root, and ~1500 files' worth of `git blame` history collapsed
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# onto that single commit.
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#
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# This check catches the failure mode by requiring `git merge-base` between
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# the PR head and main to be non-empty.
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on:
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workflow_call:
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outputs:
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review_status:
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description: "JSON array of review_status objects for the synthesizer."
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value: ${{ jobs.check-common-ancestor.outputs.review_status }}
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permissions:
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contents: read
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jobs:
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check-common-ancestor:
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runs-on: ubuntu-latest
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timeout-minutes: 10
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outputs:
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review_status: ${{ steps.merge-base-check.outputs.review_status }}
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steps:
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- uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
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with:
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fetch-depth: 0 # full history both sides for merge-base
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- id: merge-base-check
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name: Reject PRs with no common ancestor on main
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run: |
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# `git merge-base` exits non-zero AND prints nothing when the two
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# commits share no ancestor. We check both conditions explicitly
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# so the failure message is clear regardless of which signal fires
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# first.
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if ! BASE=$(git merge-base origin/main HEAD 2>/dev/null) || [ -z "$BASE" ]; then
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STATUS='[{"source":"unrelated histories","results":[{"kind":"action_required","title":"Unrelated histories","summary":"This PR has no common ancestor with main.","detail":"","how_to_fix":"Rebase your changes onto current main:\n```\ngit fetch origin main\ngit checkout -b fix-branch origin/main\n# re-apply your changes (cherry-pick, copy files, etc.)\ngit push -f origin fix-branch\n```\n"}]}]'
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echo "review_status=${STATUS}" >> "$GITHUB_OUTPUT"
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echo "review_status=${STATUS}" > review-status.json
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echo ""
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echo "::error::This PR has no common ancestor with main."
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echo ""
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echo "Your branch's history is disconnected from main. Common causes:"
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echo " - the branch was created with 'git checkout --orphan'"
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echo " - '.git/' was re-initialized at some point during the work"
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echo " - the branch was force-pushed from an unrelated repository"
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echo ""
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echo "Merging an unrelated-history PR grafts a parent-less root commit"
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echo "into main and collapses git blame for every file in that snapshot."
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echo "Reference: PR #25045 caused this and re-rooted blame on ~1500"
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echo "files to a single orphan commit."
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echo ""
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echo "To fix, rebase your changes onto current main:"
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echo " git fetch origin main"
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echo " git checkout -b fix-branch origin/main"
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echo " # re-apply your changes (cherry-pick, copy files, etc.)"
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echo " git push -f origin fix-branch"
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exit 1
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fi
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echo "::notice::Common ancestor with main: $BASE"
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echo "review_status=[]" >> "$GITHUB_OUTPUT"
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echo "review_status=[]" > review-status.json
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- name: Upload review status artifact
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if: always() && steps.merge-base-check.outcome != 'skipped'
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continue-on-error: true
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uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7
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with:
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name: review-status-history-check
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path: review-status.json
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retention-days: 1
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overwrite: true
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if-no-files-found: ignore
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