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Add a merge-back command to the release script, which automates mer…
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…ging the correct branches after a release. (matrix-org#13393)
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reivilibre authored and azmeuk committed Aug 8, 2022
1 parent 94ffff1 commit 77dfa2b
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1 change: 1 addition & 0 deletions changelog.d/13393.misc
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Add a `merge-back` command to the release script, which automates merging the correct branches after a release.
76 changes: 76 additions & 0 deletions scripts-dev/release.py
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import commonmark
import git
from click.exceptions import ClickException
from git import GitCommandError, Repo
from github import Github
from packaging import version

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# Optional: generate some nice links for the announcement
./scripts-dev/release.py merge-back
./scripts-dev/release.py announce
If the env var GH_TOKEN (or GITHUB_TOKEN) is set, or passed into the
Expand Down Expand Up @@ -441,6 +444,79 @@ def upload() -> None:
)


def _merge_into(repo: Repo, source: str, target: str) -> None:
"""
Merges branch `source` into branch `target`.
Pulls both before merging and pushes the result.
"""

# Update our branches and switch to the target branch
for branch in [source, target]:
click.echo(f"Switching to {branch} and pulling...")
repo.heads[branch].checkout()
# Pull so we're up to date
repo.remote().pull()

assert repo.active_branch.name == target

try:
# TODO This seemed easier than using GitPython directly
click.echo(f"Merging {source}...")
repo.git.merge(source)
except GitCommandError as exc:
# If a merge conflict occurs, give some context and try to
# make it easy to abort if necessary.
click.echo(exc)
if not click.confirm(
f"Likely merge conflict whilst merging ({source}{target}). "
f"Have you resolved it?"
):
repo.git.merge("--abort")
return

# Push result.
click.echo("Pushing...")
repo.remote().push()


@cli.command()
def merge_back() -> None:
"""Merge the release branch back into the appropriate branches.
All branches will be automatically pulled from the remote and the results
will be pushed to the remote."""

synapse_repo = get_repo_and_check_clean_checkout()
branch_name = synapse_repo.active_branch.name

if not branch_name.startswith("release-v"):
raise RuntimeError("Not on a release branch. This does not seem sensible.")

# Pull so we're up to date
synapse_repo.remote().pull()

current_version = get_package_version()

if current_version.is_prerelease:
# Release candidate
if click.confirm(f"Merge {branch_name} → develop?", default=True):
_merge_into(synapse_repo, branch_name, "develop")
else:
# Full release
sytest_repo = get_repo_and_check_clean_checkout("../sytest", "sytest")

if click.confirm(f"Merge {branch_name} → master?", default=True):
_merge_into(synapse_repo, branch_name, "master")

if click.confirm("Merge master → develop?", default=True):
_merge_into(synapse_repo, "master", "develop")

if click.confirm(f"On SyTest, merge {branch_name} → master?", default=True):
_merge_into(sytest_repo, branch_name, "master")

if click.confirm("On SyTest, merge master → develop?", default=True):
_merge_into(sytest_repo, "master", "develop")


@cli.command()
def announce() -> None:
"""Generate markdown to announce the release."""
Expand Down

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