71 lines
2.6 KiB
YAML
71 lines
2.6 KiB
YAML
# Use git rebase to append new upstream commits
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# inverted logic from imba-tjd/rebase-on-upstream
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name: Reverse Rebase from Upstream
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on:
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workflow_call:
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inputs:
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upstream:
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type: string
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description: <user>/<repo> or the full HTTP URL
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required: false
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branch:
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type: string
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description: The upstream branch that is rebased from
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required: false
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default: master
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push:
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type: boolean
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description: Do the force push in this action
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required: false
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default: true
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token:
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type: string
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description: GitHub Access Token
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required: true
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default: ${{ github.token }}
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permissions:
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contents: write
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jobs:
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rebaser:
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runs-on: ubuntu-latest
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steps:
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- name: Main
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shell: bash
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run: |
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set -ex
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# Starting with current git branch (TARGET), get the UPSTREAM branch
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# as a temporary branch; rebase TARGET onto it; if that differs from TARGET,
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# make it the TARGET and push the result, if the remote hasn't changed.
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# Effect: commits specific to the TARGET repo stay in place; new UPSTREAM
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# commits are appended
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TARGET_SHA=$(git rev-parse HEAD)
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TARGET=$(git name-rev --name-only "$TARGET_SHA")
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if [ -z "$TARGET" ]; then echo "Can't find current branch" >&2; exit 1; fi
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UPSTREAM=${{ inputs.upstream }}
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if [ -z "$UPSTREAM" ]; then
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echo "${{ inputs.token }}" | gh auth login --with-token
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UPSTREAM=$(gh api repos/:owner/:repo --jq .parent.full_name
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if [ -z "$UPSTREAM" ]; then echo "Can't find upstream" >&2 && exit 1; fi
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fi
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if ! echo "$UPSTREAM" | grep -E '^(http|git@)'; then
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UPSTREAM=https://github.com/$UPSTREAM.git
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fi
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git remote add -f -t "${{ inputs.branch }}" --tags upstream "$UPSTREAM"
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REBASE=${TARGET}-rebase
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trap '{ git checkout "$TARGET"; git branch -D "$REBASE"; }' EXIT
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git checkout -B "$REBASE" --no-track "upstream/${{ inputs.branch }}"
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git config --local user.email "rebaser+github-actions[bot]@users.noreply.github.com"
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git config --local user.name "GitHub Actions"
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# rebase new UPSTREAM commits onto TARGET
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UPSTREAM_SHA=$(git rev-parse HEAD)
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git rebase "refs/heads/${TARGET}"
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if [ -n "$(git log --max-count 1 --oneline "HEAD...${TARGET}")" ]; then
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git branch -M "$REBASE" "$TARGET"
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if [ "${{ inputs.push }}" = true ]; then
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# rebase changed TARGET: push if remote TARGET unchanged
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git push origin --force-with-lease="${TARGET}"
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fi
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fi
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