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# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, # You can obtain one at http://mozilla.org/MPL/2.0/.
from __future__ import absolute_import, unicode_literals
import os
import re
import subprocess
import sys
import logging
from mach.decorators import (
CommandArgument,
CommandProvider,
Command,
)
from mozbuild.base import MachCommandBase
import mozpack.path as mozpath
import json
GITHUB_ROOT = "https://github.com/"
PR_REPOSITORIES = {
"webrender": {
"github": "servo/webrender",
"path": "gfx/wr",
"bugzilla_product": "Core",
"bugzilla_component": "Graphics: WebRender",
},
"webgpu": {
"github": "gfx-rs/wgpu",
"path": "gfx/wgpu",
"bugzilla_product": "Core",
"bugzilla_component": "Graphics: WebGPU",
},
"debugger": {
"github": "firefox-devtools/debugger",
"path": "devtools/client/debugger",
"bugzilla_product": "DevTools",
"bugzilla_component": "Debugger",
},
}
@CommandProvider
class PullRequestImporter(MachCommandBase):
@Command(
"import-pr",
category="misc",
description="Import a pull request from Github to the local repo.",
)
@CommandArgument(
"-b", "--bug-number", help="Bug number to use in the commit messages."
)
@CommandArgument(
"-t",
"--bugzilla-token",
help="Bugzilla API token used to file a new bug if no bug number is "
"provided.",
)
@CommandArgument(
"-r", "--reviewer", help="Reviewer nick to apply to commit messages."
)
@CommandArgument(
"pull_request",
help="URL to the pull request to import (e.g. "
"https://github.com/servo/webrender/pull/3665).",
)
def import_pr(
self, pull_request, bug_number=None, bugzilla_token=None, reviewer=None
):
import requests
pr_number = None
repository = None
for r in PR_REPOSITORIES.values():
if pull_request.startswith(GITHUB_ROOT + r["github"] + "/pull/"):
# sanitize URL, dropping anything after the PR number
pr_number = int(re.search("/pull/([0-9]+)", pull_request).group(1))
pull_request = GITHUB_ROOT + r["github"] + "/pull/" + str(pr_number)
repository = r
break
if repository is None:
self.log(
logging.ERROR,
"unrecognized_repo",
{},
"The pull request URL was not recognized; add it to the list of "
"recognized repos in PR_REPOSITORIES in %s" % __file__,
)
sys.exit(1)
self.log(
logging.INFO,
"import_pr",
{"pr_url": pull_request},
"Attempting to import {pr_url}",
)
dirty = [
f
for f in self.repository.get_changed_files(mode="all")
if f.startswith(repository["path"])
]
if dirty:
self.log(
logging.ERROR,
"dirty_tree",
repository,
"Local {path} tree is dirty; aborting!",
)
sys.exit(1)
target_dir = mozpath.join(self.topsrcdir, os.path.normpath(repository["path"]))
if bug_number is None:
if bugzilla_token is None:
self.log(
logging.WARNING,
"no_token",
{},
"No bug number or bugzilla API token provided; bug number will not "
"be added to commit messages.",
)
else:
bug_number = self._file_bug(bugzilla_token, repository, pr_number)
elif bugzilla_token is not None:
self.log(
logging.WARNING,
"too_much_bug",
{},
"Providing a bugzilla token is unnecessary when a bug number is provided. "
"Using bug number; ignoring token.",
)
pr_patch = requests.get(pull_request + ".patch")
pr_patch.raise_for_status()
for patch in self._split_patches(
pr_patch.content, bug_number, pull_request, reviewer
):
self.log(
logging.INFO,
"commit_msg",
patch,
"Processing commit [{commit_summary}] by [{author}] at [{date}]",
)
patch_cmd = subprocess.Popen(
["patch", "-p1", "-s"], stdin=subprocess.PIPE, cwd=target_dir
)
patch_cmd.stdin.write(patch["diff"].encode("utf-8"))
patch_cmd.stdin.close()
patch_cmd.wait()
if patch_cmd.returncode != 0:
self.log(
logging.ERROR,
"commit_fail",
{},
'Error applying diff from commit via "patch -p1 -s". Aborting...',
)
sys.exit(patch_cmd.returncode)
self.repository.commit(
patch["commit_msg"], patch["author"], patch["date"], [target_dir]
)
self.log(logging.INFO, "commit_pass", {}, "Committed successfully.")
def _file_bug(self, token, repo, pr_number):
import requests
bug = requests.post(
"https://bugzilla.mozilla.org/rest/bug?api_key=%s" % token,
json={
"product": repo["bugzilla_product"],
"component": repo["bugzilla_component"],
"summary": "Land %s#%s in mozilla-central"
% (repo["github"], pr_number),
"version": "unspecified",
},
)
bug.raise_for_status()
self.log(logging.DEBUG, "new_bug", {}, bug.content)
bugnumber = json.loads(bug.content)["id"]
self.log(
logging.INFO, "new_bug", {"bugnumber": bugnumber}, "Filed bug {bugnumber}"
)
return bugnumber
def _split_patches(self, patchfile, bug_number, pull_request, reviewer):
INITIAL = 0
HEADERS = 1
STAT_AND_DIFF = 2
patch = b""
state = INITIAL
for line in patchfile.splitlines():
if state == INITIAL:
if line.startswith(b"From "):
state = HEADERS
elif state == HEADERS:
patch += line + b"\n"
if line == b"---":
state = STAT_AND_DIFF
elif state == STAT_AND_DIFF:
if line.startswith(b"From "):
yield self._parse_patch(patch, bug_number, pull_request, reviewer)
patch = b""
state = HEADERS
else:
patch += line + b"\n"
if len(patch) > 0:
yield self._parse_patch(patch, bug_number, pull_request, reviewer)
return
def _parse_patch(self, patch, bug_number, pull_request, reviewer):
import email
from email import (
header,
policy,
)
parse_policy = policy.compat32.clone(max_line_length=None)
parsed_mail = email.message_from_bytes(patch, policy=parse_policy)
def header_as_unicode(key):
decoded = header.decode_header(parsed_mail[key])
return str(header.make_header(decoded))
author = header_as_unicode("From")
date = header_as_unicode("Date")
commit_summary = header_as_unicode("Subject")
email_body = parsed_mail.get_payload(decode=True).decode("utf-8")
(commit_body, diff) = ("\n" + email_body).rsplit("\n---\n", 1)
bug_prefix = ""
if bug_number is not None:
bug_prefix = "Bug %s - " % bug_number
commit_summary = re.sub(r"^\[PATCH[0-9 /]*\] ", bug_prefix, commit_summary)
if reviewer is not None:
commit_summary += " r=" + reviewer
commit_msg = commit_summary + "\n"
if len(commit_body) > 0:
commit_msg += commit_body + "\n"
commit_msg += "\n[import_pr] From " + pull_request + "\n"
patch_obj = {
"author": author,
"date": date,
"commit_summary": commit_summary,
"commit_msg": commit_msg,
"diff": diff,
}
return patch_obj
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