Files
claude-engineering-plugin/plugins/compound-engineering/skills/ce-code-review/references/resolve-base.sh
Trevin Chow 5c0ec9137a
Some checks failed
CI / pr-title (push) Has been cancelled
CI / test (push) Has been cancelled
Release PR / release-pr (push) Has been cancelled
Release PR / publish-cli (push) Has been cancelled
refactor(cli)!: rename all skills and agents to consistent ce- prefix (#503)
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-04-18 15:44:22 -07:00

101 lines
4.2 KiB
Bash

#!/usr/bin/env bash
# Resolve the review base branch and compute the merge-base for ce-code-review.
# Handles fork-safe remote resolution, PR metadata, and multi-fallback detection.
#
# Usage: bash references/resolve-base.sh
# Output: BASE:<sha> on success, ERROR:<message> on failure.
#
# Detects the base branch from (in priority order):
# 1. PR metadata (base ref + base repo for fork safety)
# 2. origin/HEAD symbolic ref
# 3. gh repo view defaultBranchRef
# 4. Common branch names: main, master, develop, trunk
set -euo pipefail
REVIEW_BASE_BRANCH=""
PR_BASE_REPO=""
PR_BASE_REMOTE=""
BASE_REF=""
# Step 1: Try PR metadata (handles fork workflows)
if command -v gh >/dev/null 2>&1; then
PR_META=$(gh pr view --json baseRefName,url 2>/dev/null || true)
if [ -n "$PR_META" ]; then
REVIEW_BASE_BRANCH=$(echo "$PR_META" | jq -r '.baseRefName // empty' 2>/dev/null || true)
PR_BASE_REPO=$(echo "$PR_META" | jq -r '.url // empty' 2>/dev/null | sed -n 's#https://github.com/\([^/]*/[^/]*\)/pull/.*#\1#p' || true)
fi
fi
# Step 2: Fall back to origin/HEAD
if [ -z "$REVIEW_BASE_BRANCH" ]; then
REVIEW_BASE_BRANCH=$(git symbolic-ref --quiet --short refs/remotes/origin/HEAD 2>/dev/null | sed 's#^origin/##' || true)
fi
# Step 3: Fall back to gh repo view
if [ -z "$REVIEW_BASE_BRANCH" ] && command -v gh >/dev/null 2>&1; then
REVIEW_BASE_BRANCH=$(gh repo view --json defaultBranchRef --jq '.defaultBranchRef.name' 2>/dev/null || true)
fi
# Step 4: Fall back to common branch names
if [ -z "$REVIEW_BASE_BRANCH" ]; then
for candidate in main master develop trunk; do
if git rev-parse --verify "origin/$candidate" >/dev/null 2>&1 || git rev-parse --verify "$candidate" >/dev/null 2>&1; then
REVIEW_BASE_BRANCH="$candidate"
break
fi
done
fi
# Resolve the base ref from the correct remote (fork-safe)
if [ -n "$REVIEW_BASE_BRANCH" ]; then
if [ -n "$PR_BASE_REPO" ]; then
PR_BASE_REMOTE=$(git remote -v | awk "index(\$2, \"github.com:$PR_BASE_REPO\") || index(\$2, \"github.com/$PR_BASE_REPO\") {print \$1; exit}")
if [ -n "$PR_BASE_REMOTE" ]; then
BASE_REF=$(git rev-parse --verify "$PR_BASE_REMOTE/$REVIEW_BASE_BRANCH" 2>/dev/null || true)
if [ -z "$BASE_REF" ]; then
git fetch --no-tags "$PR_BASE_REMOTE" "$REVIEW_BASE_BRANCH:refs/remotes/$PR_BASE_REMOTE/$REVIEW_BASE_BRANCH" 2>/dev/null || git fetch --no-tags "$PR_BASE_REMOTE" "$REVIEW_BASE_BRANCH" 2>/dev/null || true
BASE_REF=$(git rev-parse --verify "$PR_BASE_REMOTE/$REVIEW_BASE_BRANCH" 2>/dev/null || true)
fi
fi
fi
if [ -z "$BASE_REF" ]; then
# Only try origin if it exists as a remote; otherwise skip to avoid
# confusing errors in fork setups where origin points at the user's fork.
if git remote get-url origin >/dev/null 2>&1; then
BASE_REF=$(git rev-parse --verify "origin/$REVIEW_BASE_BRANCH" 2>/dev/null || true)
if [ -z "$BASE_REF" ]; then
git fetch --no-tags origin "$REVIEW_BASE_BRANCH:refs/remotes/origin/$REVIEW_BASE_BRANCH" 2>/dev/null || git fetch --no-tags origin "$REVIEW_BASE_BRANCH" 2>/dev/null || true
BASE_REF=$(git rev-parse --verify "origin/$REVIEW_BASE_BRANCH" 2>/dev/null || true)
fi
fi
# Fall back to a bare local ref only if remote resolution failed
if [ -z "$BASE_REF" ]; then
BASE_REF=$(git rev-parse --verify "$REVIEW_BASE_BRANCH" 2>/dev/null || true)
fi
fi
fi
# Compute merge-base
if [ -n "$BASE_REF" ]; then
BASE=$(git merge-base HEAD "$BASE_REF" 2>/dev/null) || BASE=""
if [ -z "$BASE" ] && [ "$(git rev-parse --is-shallow-repository 2>/dev/null || echo false)" = "true" ]; then
if git remote get-url origin >/dev/null 2>&1; then
git fetch --no-tags --unshallow origin 2>/dev/null || true
BASE=$(git merge-base HEAD "$BASE_REF" 2>/dev/null) || BASE=""
fi
if [ -z "$BASE" ] && [ -n "$PR_BASE_REMOTE" ] && [ "$PR_BASE_REMOTE" != "origin" ]; then
git fetch --no-tags --unshallow "$PR_BASE_REMOTE" 2>/dev/null || true
BASE=$(git merge-base HEAD "$BASE_REF" 2>/dev/null) || BASE=""
fi
fi
else
BASE=""
fi
if [ -n "$BASE" ]; then
echo "BASE:$BASE"
else
echo "ERROR:Unable to resolve review base branch locally. Fetch the base branch and rerun, or provide a PR number so the review scope can be determined from PR metadata."
fi