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action.yml
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action.yml
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name: Sync Fork
description: Rebase a forked repository's branch on top of an upstream repository's branch.
author: The Browser Company
inputs:
fork_repo:
description: The repository to update.
required: false
fork_branch:
description: The branch to update.
required: true
upstream_repo:
description: The repository to pull changes from.
required: true
upstream_branch:
description: The branch to pull changes from.
required: true
upstream_host:
description: The upstream repository URL host, if not github.com.
required: false
default: 'github.com'
dry_run:
description: If true, changes are not pushed to the fork.
required: false
default: false
token:
description: Authentication token to use for Git commands
required: false
runs:
using: composite
steps:
- uses: actions/checkout@v4
with:
repository: ${{ inputs.fork_repo }}
ref: ${{ inputs.fork_branch }}
# Fetch all commits from the fork to prevent arbitrary merge conflicts.
fetch-depth: 0
path: ${{ github.workspace }}/fork
token: ${{ inputs.token || github.token }}
- name: Rebase onto upstream
shell: pwsh
run: |
Set-StrictMode -Version 1
cd ${{ github.workspace }}/fork
git config --global user.name '${{ github.actor }}'
git config --global user.email '${{ github.actor }}@users.noreply.github.com'
git remote add upstream https://${{ inputs.upstream_host }}/${{ inputs.upstream_repo }}
git fetch upstream ${{ inputs.upstream_branch }}
# Store the list of commits we're about to rebase as a job summary.
# --format is a GitHub flavored markdown table row.
$NewCommitsFromUpstream=(git log --format="|%h|%s|" --no-merges upstream/${{ inputs.upstream_branch }} ^${{ inputs.fork_branch }})
echo "|Commit|Description|" | Out-File -Append -Encoding utf8 $env:GITHUB_STEP_SUMMARY
echo "|:-----|:----------|" | Out-File -Append -Encoding utf8 $env:GITHUB_STEP_SUMMARY
foreach ($Commit in $NewCommitsFromUpstream) {
$Commit=$Commit -replace "`"","'"
echo "${Commit}" | Out-File -Append -Encoding utf8 $env:GITHUB_STEP_SUMMARY
}
git checkout ${{ inputs.fork_branch }}
git rebase upstream/${{ inputs.upstream_branch }}
- name: Push changes
if: ${{ inputs.dry_run == 'false' || inputs.dry_run == false }}
shell: pwsh
run: git -C ${{ github.workspace }}/fork push origin ${{ inputs.fork_branch }} -f