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Fix PR checkout to support fork PRs (#851)

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Use GitHub's PR refs (pull/NUMBER/head) instead of fetching branch
by name. This works for both same-repo and fork PRs because GitHub
automatically creates these refs in the base repository for all PRs.

The branch name doesn't exist on origin for fork PRs, causing:
  fatal: couldn't find remote ref <branch-name>

Using pull/${entityNumber}/head:${branchName} fetches the PR head
and creates a local branch with the correct name.

Fixes issues with tag mode failing on fork PRs.
This commit is contained in:
Sol Redfern 2026-02-11 01:52:32 +09:00 committed by GitHub
parent b433f16b30
commit 21e3fe0542
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1 changed files with 7 additions and 1 deletions
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8
src/github/operations/branch.ts
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@ -166,7 +166,13 @@ export async function setupBranch(
// Execute git commands to checkout PR branch (dynamic depth based on PR size) // Execute git commands to checkout PR branch (dynamic depth based on PR size)
// Using execFileSync instead of shell template literals for security // Using execFileSync instead of shell template literals for security
execGit(["fetch", "origin", `--depth=${fetchDepth}`, branchName]); // Use GitHub's PR ref which works for both same-repo and fork PRs
execGit([
"fetch",
"origin",
`--depth=${fetchDepth}`,
`pull/${entityNumber}/head:${branchName}`,
]);
execGit(["checkout", branchName, "--"]); execGit(["checkout", branchName, "--"]);
console.log(`Successfully checked out PR branch for PR #${entityNumber}`); console.log(`Successfully checked out PR branch for PR #${entityNumber}`);