191 lines
4.9 KiB
YAML
191 lines
4.9 KiB
YAML
name: Mirror Gitea refs to GitHub
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on:
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push:
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branches:
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- master
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tags:
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- "*"
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jobs:
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mirror:
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runs-on: ubuntu-latest
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env:
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MIRROR_REPOSITORY: ${{ vars.MIRROR_REPOSITORY }}
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MIRROR_BASE_BRANCH: ${{ vars.MIRROR_BASE_BRANCH }}
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MIRROR_GITHUB_SSH_KEY: ${{ secrets.MIRROR_GITHUB_SSH_KEY }}
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MIRROR_GITHUB_KNOWN_HOSTS: ${{ secrets.MIRROR_GITHUB_KNOWN_HOSTS }}
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MIRROR_REF_TYPE: ${{ gitea.ref_type }}
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MIRROR_REF_NAME: ${{ gitea.ref_name }}
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steps:
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- name: Check out the authoritative Gitea repository
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uses: actions/checkout@v4
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with:
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fetch-depth: 0
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- name: Push without rewriting GitHub history
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shell: bash
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run: |
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set -Eeuo pipefail
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RequireVariable() {
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local variable_name="$1"
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if [[ -z "${!variable_name:-}" ]]; then
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echo "Missing required variable: ${variable_name}" >&2
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exit 1
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fi
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}
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for variable_name in \
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MIRROR_REPOSITORY \
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MIRROR_BASE_BRANCH \
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MIRROR_GITHUB_SSH_KEY \
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MIRROR_GITHUB_KNOWN_HOSTS \
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MIRROR_REF_TYPE \
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MIRROR_REF_NAME; do
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RequireVariable "${variable_name}"
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done
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install -d -m 700 "${HOME}/.ssh"
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printf '%s\n' "${MIRROR_GITHUB_SSH_KEY}" \
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> "${HOME}/.ssh/id_ed25519"
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printf '%s\n' "${MIRROR_GITHUB_KNOWN_HOSTS}" \
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> "${HOME}/.ssh/known_hosts"
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chmod 600 "${HOME}/.ssh/id_ed25519"
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chmod 644 "${HOME}/.ssh/known_hosts"
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git remote remove github 2>/dev/null || true
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git remote add github \
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"git@github.com:${MIRROR_REPOSITORY}.git"
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if [[ "${MIRROR_REF_TYPE}" == "branch" ]]; then
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if [[
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"${MIRROR_REF_NAME}" != "${MIRROR_BASE_BRANCH}"
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]]; then
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echo \
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"Ignoring non-authoritative branch" \
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"${MIRROR_REF_NAME}."
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exit 0
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fi
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git fetch origin \
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"+refs/heads/${MIRROR_BASE_BRANCH}:refs/remotes/origin/${MIRROR_BASE_BRANCH}"
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local_sha="$(
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git rev-parse \
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"refs/remotes/origin/${MIRROR_BASE_BRANCH}"
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)"
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remote_sha="$(
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git ls-remote \
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github \
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"refs/heads/${MIRROR_BASE_BRANCH}" \
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| awk 'NR == 1 { print $1 }'
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)"
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if [[ -z "${remote_sha}" ]]; then
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git push github \
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"${local_sha}:refs/heads/${MIRROR_BASE_BRANCH}"
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exit 0
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fi
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if [[ "${local_sha}" == "${remote_sha}" ]]; then
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echo \
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"GitHub ${MIRROR_BASE_BRANCH}" \
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"is already synchronized."
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exit 0
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fi
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git fetch \
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--no-tags \
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github \
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"refs/heads/${MIRROR_BASE_BRANCH}:refs/remotes/github/${MIRROR_BASE_BRANCH}"
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if ! git merge-base \
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--is-ancestor \
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"${remote_sha}" \
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"${local_sha}"; then
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echo \
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"Refusing to overwrite GitHub" \
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"${MIRROR_BASE_BRANCH}." \
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>&2
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echo \
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"GitHub ${remote_sha} is not an ancestor" \
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"of Gitea ${local_sha}." \
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>&2
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echo \
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"Import and resolve the GitHub commit" \
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"on Gitea first." \
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>&2
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exit 1
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fi
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git push github \
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"${local_sha}:refs/heads/${MIRROR_BASE_BRANCH}"
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exit 0
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fi
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if [[ "${MIRROR_REF_TYPE}" == "tag" ]]; then
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local_tag_sha="$(
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git rev-parse \
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"refs/tags/${MIRROR_REF_NAME}"
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)"
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remote_tag_sha="$(
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git ls-remote \
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github \
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"refs/tags/${MIRROR_REF_NAME}" \
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| awk 'NR == 1 { print $1 }'
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)"
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if [[ -z "${remote_tag_sha}" ]]; then
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git push github \
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"refs/tags/${MIRROR_REF_NAME}:refs/tags/${MIRROR_REF_NAME}"
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exit 0
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fi
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if [[ "${local_tag_sha}" == "${remote_tag_sha}" ]]; then
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echo \
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"GitHub tag ${MIRROR_REF_NAME}" \
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"is already synchronized."
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exit 0
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fi
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echo \
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"Refusing to rewrite GitHub tag" \
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"${MIRROR_REF_NAME}." \
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>&2
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echo \
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"GitHub has ${remote_tag_sha};" \
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"Gitea has ${local_tag_sha}." \
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>&2
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exit 1
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fi
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echo \
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"Unsupported ref type: ${MIRROR_REF_TYPE}" \
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>&2
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exit 1
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