ClickHouse/tests/ci/cherry_pick.py

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#!/usr/bin/env python3
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"""
A plan:
- TODO: consider receiving GH objects cache from S3, but it's really a few
of requests to API currently
- Get all open release PRs (20.10, 21.8, 22.5, etc.)
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- Get all pull-requests between the date of the merge-base for the oldest PR with
labels pr-must-backport and version-specific v21.8-must-backport, but without
pr-backported
- Iterate over gotten PRs:
- for pr-must-backport:
- check if all backport-PRs are created. If yes,
set pr-backported label and finish
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- If not, create either cherrypick PRs or merge cherrypick (in the same
stage, if mergable) and create backport-PRs
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- If successfull, set pr-backported label on the PR
- for version-specific labels:
- the same, check, cherry-pick, backport, pr-backported
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Cherry-pick stage:
- From time to time the cherry-pick fails, if it was done manually. In the
case we check if it's even needed, and mark the release as done somehow.
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"""
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import argparse
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import logging
import os
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from contextlib import contextmanager
from datetime import date, datetime, timedelta
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from pathlib import Path
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from subprocess import CalledProcessError
from typing import List, Optional
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from env_helper import TEMP_PATH
from get_robot_token import get_best_robot_token
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from git_helper import git_runner, is_shallow
from github_helper import (
GitHub,
PullRequest,
PullRequests,
Repository,
)
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from ssh import SSHKey
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class Labels:
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MUST_BACKPORT = "pr-must-backport"
MUST_BACKPORT_CLOUD = "pr-must-backport-cloud"
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BACKPORT = "pr-backport"
BACKPORTS_CREATED = "pr-backports-created"
BACKPORTS_CREATED_CLOUD = "pr-backports-created-cloud"
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CHERRYPICK = "pr-cherrypick"
DO_NOT_TEST = "do not test"
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class ReleaseBranch:
CHERRYPICK_DESCRIPTION = """Original pull-request #{pr_number}
This pull-request is a first step of an automated backporting.
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It contains changes similar to calling `git cherry-pick` locally.
If you intend to continue backporting the changes, then resolve all conflicts if any.
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Otherwise, if you do not want to backport them, then just close this pull-request.
The check results does not matter at this step - you can safely ignore them.
### Note
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This pull-request will be merged automatically. Please, **do not merge it manually** \
(but if you accidentally did, nothing bad will happen).
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### Troubleshooting
#### If the PR was manually reopened after being closed
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If this PR is stuck (i.e. not automatically merged after one day), check {pr_url} for \
`{backport_created_label}` *label* and delete it.
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Manually merging will do nothing. The `{backport_created_label}` *label* prevents the \
original PR {pr_url} from being processed.
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#### If the conflicts were resolved in a wrong way
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If this cherry-pick PR is completely screwed by a wrong conflicts resolution, and you \
want to recreate it:
- delete the `{label_cherrypick}` label from the PR
- delete this branch from the repository
You also need to check the original PR {pr_url} for `{backport_created_label}`, and \
delete if it's presented there
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"""
BACKPORT_DESCRIPTION = """This pull-request is a last step of an automated \
backporting.
Treat it as a standard pull-request: look at the checks and resolve conflicts.
Merge it only if you intend to backport changes to the target branch, otherwise just \
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close it.
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"""
REMOTE = ""
def __init__(
self,
name: str,
pr: PullRequest,
repo: Repository,
backport_created_label: str = Labels.BACKPORTS_CREATED,
):
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self.name = name
self.pr = pr
self.repo = repo
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self.cherrypick_branch = f"cherrypick/{name}/{pr.merge_commit_sha}"
self.backport_branch = f"backport/{name}/{pr.number}"
self.cherrypick_pr = None # type: Optional[PullRequest]
self.backport_pr = None # type: Optional[PullRequest]
self._backported = False
self.backport_created_label = backport_created_label
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self.git_prefix = ( # All commits to cherrypick are done as robot-clickhouse
"git -c user.email=robot-clickhouse@users.noreply.github.com "
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"-c user.name=robot-clickhouse -c commit.gpgsign=false"
)
self.pre_check()
def pre_check(self):
branch_updated = git_runner(
f"git branch -a --contains={self.pr.merge_commit_sha} "
f"{self.REMOTE}/{self.name}"
)
if branch_updated:
self._backported = True
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def pop_prs(self, prs: PullRequests) -> None:
"""the method processes all prs and pops the ReleaseBranch related prs"""
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to_pop = [] # type: List[int]
for i, pr in enumerate(prs):
if self.name not in pr.head.ref:
continue
if pr.head.ref.startswith(f"cherrypick/{self.name}"):
self.cherrypick_pr = pr
to_pop.append(i)
elif pr.head.ref.startswith(f"backport/{self.name}"):
self.backport_pr = pr
to_pop.append(i)
else:
logging.error(
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"head ref of PR #%s isn't starting with known suffix",
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pr.number,
)
for i in reversed(to_pop):
# Going from the tail to keep the order and pop greater index first
prs.pop(i)
def process( # pylint: disable=too-many-return-statements
self, dry_run: bool
) -> None:
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if self.backported:
return
if not self.cherrypick_pr:
if dry_run:
logging.info(
"DRY RUN: Would create cherrypick PR for #%s", self.pr.number
)
return
self.create_cherrypick()
if self.backported:
return
if self.cherrypick_pr is not None:
# Try to merge cherrypick instantly
if self.cherrypick_pr.mergeable and self.cherrypick_pr.state != "closed":
if dry_run:
logging.info(
"DRY RUN: Would merge cherry-pick PR for #%s", self.pr.number
)
return
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self.cherrypick_pr.merge()
# The PR needs update, since PR.merge doesn't update the object
self.cherrypick_pr.update()
if self.cherrypick_pr.merged:
if dry_run:
logging.info(
"DRY RUN: Would create backport PR for #%s", self.pr.number
)
return
self.create_backport()
return
if self.cherrypick_pr.state == "closed":
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logging.info(
"The cherrypick PR #%s for PR #%s is discarded",
self.cherrypick_pr.number,
self.pr.number,
)
self._backported = True
return
logging.info(
"Cherrypick PR #%s for PR #%s have conflicts and unable to be merged",
self.cherrypick_pr.number,
self.pr.number,
)
self.ping_cherry_pick_assignees(dry_run)
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def create_cherrypick(self):
# First, create backport branch:
# Checkout release branch with discarding every change
git_runner(f"{self.git_prefix} checkout -f {self.name}")
# Create or reset backport branch
git_runner(f"{self.git_prefix} checkout -B {self.backport_branch}")
# Merge all changes from PR's the first parent commit w/o applying anything
# It will allow to create a merge commit like it would be a cherry-pick
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first_parent = git_runner(f"git rev-parse {self.pr.merge_commit_sha}^1")
git_runner(f"{self.git_prefix} merge -s ours --no-edit {first_parent}")
# Second step, create cherrypick branch
git_runner(
f"{self.git_prefix} branch -f "
f"{self.cherrypick_branch} {self.pr.merge_commit_sha}"
)
# Check if there are actually any changes between branches. If no, then no
# other actions are required. It's possible when changes are backported
# manually to the release branch already
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try:
output = git_runner(
f"{self.git_prefix} merge --no-commit --no-ff {self.cherrypick_branch}"
)
# 'up-to-date', 'up to date', who knows what else (╯°v°)╯ ^┻━┻
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if output.startswith("Already up") and output.endswith("date."):
# The changes are already in the release branch, we are done here
logging.info(
"Release branch %s already contain changes from %s",
self.name,
self.pr.number,
)
self._backported = True
return
except CalledProcessError:
# There are most probably conflicts, they'll be resolved in PR
git_runner(f"{self.git_prefix} reset --merge")
else:
# There are changes to apply, so continue
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git_runner(f"{self.git_prefix} reset --merge")
# Push, create the cherrypick PR, lable and assign it
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for branch in [self.cherrypick_branch, self.backport_branch]:
git_runner(f"{self.git_prefix} push -f {self.REMOTE} {branch}:{branch}")
self.cherrypick_pr = self.repo.create_pull(
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title=f"Cherry pick #{self.pr.number} to {self.name}: {self.pr.title}",
body=self.CHERRYPICK_DESCRIPTION.format(
pr_number=self.pr.number,
pr_url=self.pr.html_url,
backport_created_label=self.backport_created_label,
label_cherrypick=Labels.CHERRYPICK,
),
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base=self.backport_branch,
head=self.cherrypick_branch,
)
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self.cherrypick_pr.add_to_labels(Labels.CHERRYPICK)
self.cherrypick_pr.add_to_labels(Labels.DO_NOT_TEST)
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self._assign_new_pr(self.cherrypick_pr)
# update cherrypick PR to get the state for PR.mergable
self.cherrypick_pr.update()
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def create_backport(self):
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assert self.cherrypick_pr is not None
# Checkout the backport branch from the remote and make all changes to
# apply like they are only one cherry-pick commit on top of release
logging.info("Creating backport for PR #%s", self.pr.number)
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git_runner(f"{self.git_prefix} checkout -f {self.backport_branch}")
git_runner(
f"{self.git_prefix} pull --ff-only {self.REMOTE} {self.backport_branch}"
)
merge_base = git_runner(
f"{self.git_prefix} merge-base "
f"{self.REMOTE}/{self.name} {self.backport_branch}"
)
git_runner(f"{self.git_prefix} reset --soft {merge_base}")
title = f"Backport #{self.pr.number} to {self.name}: {self.pr.title}"
git_runner(f"{self.git_prefix} commit --allow-empty -F -", input=title)
# Push with force, create the backport PR, lable and assign it
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git_runner(
f"{self.git_prefix} push -f {self.REMOTE} "
f"{self.backport_branch}:{self.backport_branch}"
)
self.backport_pr = self.repo.create_pull(
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title=title,
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body=f"Original pull-request {self.pr.html_url}\n"
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f"Cherry-pick pull-request #{self.cherrypick_pr.number}\n\n"
f"{self.BACKPORT_DESCRIPTION}",
base=self.name,
head=self.backport_branch,
)
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self.backport_pr.add_to_labels(Labels.BACKPORT)
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self._assign_new_pr(self.backport_pr)
def ping_cherry_pick_assignees(self, dry_run: bool) -> None:
assert self.cherrypick_pr is not None
logging.info(
"Checking if cherry-pick PR #%s needs to be pinged",
self.cherrypick_pr.number,
)
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# The `updated_at` is Optional[datetime]
cherrypick_updated_ts = (
self.cherrypick_pr.updated_at or datetime.now()
).timestamp()
since_updated = int(datetime.now().timestamp() - cherrypick_updated_ts)
since_updated_str = (
f"{since_updated // 86400}d{since_updated // 3600}"
f"h{since_updated // 60 % 60}m{since_updated % 60}s"
)
if since_updated < 86400:
logging.info(
"The cherry-pick PR was updated %s ago, "
"waiting for the next running",
since_updated_str,
)
return
assignees = ", ".join(f"@{user.login}" for user in self.cherrypick_pr.assignees)
comment_body = (
f"Dear {assignees}, the PR is not updated for {since_updated_str}. "
"Please, either resolve the conflicts, or close it to finish "
f"the backport process of #{self.pr.number}"
)
if dry_run:
logging.info(
"DRY RUN: would comment the cherry-pick PR #%s:\n",
self.cherrypick_pr.number,
)
return
self.cherrypick_pr.create_issue_comment(comment_body)
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def _assign_new_pr(self, new_pr: PullRequest) -> None:
"""Assign `new_pr` to author, merger and assignees of an original PR"""
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# It looks there some race when multiple .add_to_assignees are executed,
# so we'll add all at once
assignees = [self.pr.user, self.pr.merged_by]
if self.pr.assignees:
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assignees.extend(self.pr.assignees)
logging.info(
"Assing #%s to author and assignees of the original PR: %s",
new_pr.number,
", ".join(user.login for user in assignees),
)
new_pr.add_to_assignees(*assignees)
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@property
def backported(self) -> bool:
return self._backported or self.backport_pr is not None
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def __repr__(self):
return self.name
class Backport:
def __init__(
self,
gh: GitHub,
repo: str,
fetch_from: Optional[str],
dry_run: bool,
must_create_backport_label: str,
backport_created_label: str,
):
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self.gh = gh
self._repo_name = repo
self._fetch_from = fetch_from
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self.dry_run = dry_run
self.must_create_backport_label = must_create_backport_label
self.backport_created_label = backport_created_label
self._remote = ""
self._remote_line = ""
self._repo = None # type: Optional[Repository]
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self.release_prs = [] # type: PullRequests
self.release_branches = [] # type: List[str]
self.labels_to_backport = [] # type: List[str]
self.prs_for_backport = [] # type: PullRequests
self.error = None # type: Optional[Exception]
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@property
def remote_line(self) -> str:
if not self._remote_line:
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# lines of "origin git@github.com:ClickHouse/ClickHouse.git (fetch)"
remotes = git_runner("git remote -v").split("\n")
# We need the first word from the first matching result
self._remote_line = next(
iter(
remote
for remote in remotes
if f"github.com/{self._repo_name}" in remote # https
or f"github.com:{self._repo_name}" in remote # ssh
)
)
return self._remote_line
@property
def remote(self) -> str:
if not self._remote:
self._remote = self.remote_line.split(maxsplit=1)[0]
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git_runner(f"git fetch {self._remote}")
ReleaseBranch.REMOTE = self._remote
return self._remote
@property
def is_remote_ssh(self) -> bool:
return "github.com:" in self.remote_line
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def receive_release_prs(self):
logging.info("Getting release PRs")
self.release_prs = self.gh.get_release_pulls(self._repo_name)
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self.release_branches = [pr.head.ref for pr in self.release_prs]
self.labels_to_backport = [
f"v{branch}-must-backport" for branch in self.release_branches
]
if self._fetch_from:
logging.info("Fetching from %s", self._fetch_from)
fetch_from_repo = self.gh.get_repo(self._fetch_from)
git_runner(
f"git fetch {fetch_from_repo.ssh_url if self.is_remote_ssh else fetch_from_repo.clone_url} {fetch_from_repo.default_branch} --no-tags"
)
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logging.info("Active releases: %s", ", ".join(self.release_branches))
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def update_local_release_branches(self):
logging.info("Update local release branches")
branches = git_runner("git branch").split()
for branch in self.release_branches:
if branch not in branches:
# the local branch is not exist, so continue
continue
local_ref = git_runner(f"git rev-parse {branch}")
remote_ref = git_runner(f"git rev-parse {self.remote}/{branch}")
if local_ref == remote_ref:
# Do not need to update, continue
continue
logging.info("Resetting %s to %s/%s", branch, self.remote, branch)
git_runner(f"git branch -f {branch} {self.remote}/{branch}")
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def receive_prs_for_backport(self):
# The commits in the oldest open release branch
oldest_branch_commits = git_runner(
"git log --no-merges --format=%H --reverse "
f"{self.remote}/{self.default_branch}..{self.remote}/{self.release_branches[0]}"
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)
# The first commit is the one we are looking for
since_commit = oldest_branch_commits.split("\n", 1)[0]
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since_date = date.fromisoformat(
git_runner.run(f"git log -1 --format=format:%cs {since_commit}")
)
# To not have a possible TZ issues
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tomorrow = date.today() + timedelta(days=1)
logging.info("Receive PRs suppose to be backported")
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self.prs_for_backport = self.gh.get_pulls_from_search(
query=f"type:pr repo:{self._fetch_from} -label:{self.backport_created_label}",
label=",".join(self.labels_to_backport + [self.must_create_backport_label]),
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merged=[since_date, tomorrow],
)
logging.info(
"PRs to be backported:\n %s",
"\n ".join([pr.html_url for pr in self.prs_for_backport]),
)
def process_backports(self):
for pr in self.prs_for_backport:
try:
self.process_pr(pr)
except Exception as e:
logging.error(
"During processing the PR #%s error occured: %s", pr.number, e
)
self.error = e
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def process_pr(self, pr: PullRequest) -> None:
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pr_labels = [label.name for label in pr.labels]
if self.must_create_backport_label in pr_labels:
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branches = [
ReleaseBranch(br, pr, self.repo, self.backport_created_label)
for br in self.release_branches
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] # type: List[ReleaseBranch]
else:
branches = [
ReleaseBranch(br, pr, self.repo, self.backport_created_label)
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for br in [
label.split("-", 1)[0][1:] # v21.8-must-backport
for label in pr_labels
if label in self.labels_to_backport
]
]
if not branches:
# This is definitely some error. There must be at least one branch
# It also make the whole program exit code non-zero
self.error = Exception(
f"There are no branches to backport PR #{pr.number}, logical error"
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)
raise self.error
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logging.info(
" PR #%s is suppose to be backported to %s",
pr.number,
", ".join(map(str, branches)),
)
# All PRs for cherrypick and backport branches as heads
query_suffix = " ".join(
[
f"head:{branch.backport_branch} head:{branch.cherrypick_branch}"
for branch in branches
]
)
bp_cp_prs = self.gh.get_pulls_from_search(
query=f"type:pr repo:{self._repo_name} {query_suffix}",
label=f"{Labels.BACKPORT},{Labels.CHERRYPICK}",
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)
for br in branches:
br.pop_prs(bp_cp_prs)
if bp_cp_prs:
# This is definitely some error. All prs must be consumed by
# branches with ReleaseBranch.pop_prs. It also makes the whole
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# program exit code non-zero
self.error = Exception(
"The following PRs are not filtered by release branches:\n"
"\n".join(map(str, bp_cp_prs))
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)
raise self.error
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if all(br.backported for br in branches):
# Let's check if the PR is already backported
self.mark_pr_backported(pr)
return
for br in branches:
br.process(self.dry_run)
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if all(br.backported for br in branches):
# And check it after the running
self.mark_pr_backported(pr)
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def mark_pr_backported(self, pr: PullRequest) -> None:
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if self.dry_run:
logging.info("DRY RUN: would mark PR #%s as done", pr.number)
return
pr.add_to_labels(self.backport_created_label)
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logging.info(
"PR #%s is successfully labeled with `%s`",
pr.number,
self.backport_created_label,
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)
@property
def repo(self) -> Repository:
if self._repo is None:
self._repo = self.gh.get_repo(self._repo_name)
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return self._repo
@property
def default_branch(self) -> str:
return self.repo.default_branch
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def parse_args():
parser = argparse.ArgumentParser("Create cherry-pick and backport PRs")
parser.add_argument("--token", help="github token, if not set, used from smm")
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parser.add_argument(
"--repo", default="ClickHouse/ClickHouse", help="repo owner/name"
)
parser.add_argument(
"--from-repo",
default="ClickHouse/ClickHouse",
help="if set, the commits will be taken from this repo, but PRs will be created in the main repo",
)
parser.add_argument("--dry-run", action="store_true", help="do not create anything")
parser.add_argument(
"--must-create-backport-label",
default=Labels.MUST_BACKPORT,
choices=(Labels.MUST_BACKPORT, Labels.MUST_BACKPORT_CLOUD),
help="label to filter PRs to backport",
)
parser.add_argument(
"--backport-created-label",
default=Labels.BACKPORTS_CREATED,
choices=(Labels.BACKPORTS_CREATED, Labels.BACKPORTS_CREATED_CLOUD),
help="label to mark PRs as backported",
)
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parser.add_argument(
"--debug-helpers",
action="store_true",
help="add debug logging for git_helper and github_helper",
)
return parser.parse_args()
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@contextmanager
def clear_repo():
orig_ref = git_runner("git branch --show-current") or git_runner(
"git rev-parse HEAD"
)
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try:
yield
except (Exception, KeyboardInterrupt):
git_runner(f"git checkout -f {orig_ref}")
raise
else:
git_runner(f"git checkout -f {orig_ref}")
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@contextmanager
def stash():
# diff.ignoreSubmodules=all don't show changed submodules
need_stash = bool(git_runner("git -c diff.ignoreSubmodules=all diff HEAD"))
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if need_stash:
git_runner("git stash push --no-keep-index -m 'running cherry_pick.py'")
try:
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with clear_repo():
yield
except (Exception, KeyboardInterrupt):
if need_stash:
git_runner("git stash pop")
raise
else:
if need_stash:
git_runner("git stash pop")
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def main():
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temp_path = Path(TEMP_PATH)
temp_path.mkdir(parents=True, exist_ok=True)
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args = parse_args()
if args.debug_helpers:
logging.getLogger("github_helper").setLevel(logging.DEBUG)
logging.getLogger("git_helper").setLevel(logging.DEBUG)
token = args.token or get_best_robot_token()
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gh = GitHub(token, create_cache_dir=False)
bp = Backport(
gh,
args.repo,
args.from_repo,
args.dry_run,
args.must_create_backport_label,
args.backport_created_label,
)
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# https://github.com/python/mypy/issues/3004
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bp.gh.cache_path = temp_path / "gh_cache"
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bp.receive_release_prs()
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bp.update_local_release_branches()
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bp.receive_prs_for_backport()
bp.process_backports()
if bp.error is not None:
logging.error("Finished successfully, but errors occured!")
raise bp.error
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if __name__ == "__main__":
logging.getLogger().setLevel(level=logging.INFO)
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assert not is_shallow()
with stash():
if os.getenv("ROBOT_CLICKHOUSE_SSH_KEY", ""):
with SSHKey("ROBOT_CLICKHOUSE_SSH_KEY"):
main()
else:
main()