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ec01825ba5
475c08c Add PR description to merge commit in github-merge.py (Pieter Wuille)
Pull request description:
There is often some context given in PR descriptions that is missing from commits, and it may be worthwhile to retain that information in our history in git. This PR adds that information to the merge commit when created through `github-merge.py`.
We should also encourage people to provide as much information as possible in the PR commits themselves, but I believe that is an orthogonal issue. Individual commits don't need to have a description of the overall goal of a PR.
Tree-SHA512: cbae46ec24ce911744e11a07e5d51895d3acc79659db306d8124304ef8e422bba99001ee2a741b08c92a5eb39d9c3f6b723622b20d6553ca5cfa0a8de866194c
334 lines
14 KiB
Python
Executable File
334 lines
14 KiB
Python
Executable File
#!/usr/bin/env python3
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# Copyright (c) 2016-2017 Bitcoin Core Developers
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# Distributed under the MIT software license, see the accompanying
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# file COPYING or http://www.opensource.org/licenses/mit-license.php.
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# This script will locally construct a merge commit for a pull request on a
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# github repository, inspect it, sign it and optionally push it.
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# The following temporary branches are created/overwritten and deleted:
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# * pull/$PULL/base (the current master we're merging onto)
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# * pull/$PULL/head (the current state of the remote pull request)
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# * pull/$PULL/merge (github's merge)
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# * pull/$PULL/local-merge (our merge)
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# In case of a clean merge that is accepted by the user, the local branch with
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# name $BRANCH is overwritten with the merged result, and optionally pushed.
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from __future__ import division,print_function,unicode_literals
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import os
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from sys import stdin,stdout,stderr
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import argparse
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import hashlib
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import subprocess
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import json,codecs
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try:
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from urllib.request import Request,urlopen
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except:
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from urllib2 import Request,urlopen
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# External tools (can be overridden using environment)
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GIT = os.getenv('GIT','git')
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BASH = os.getenv('BASH','bash')
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# OS specific configuration for terminal attributes
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ATTR_RESET = ''
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ATTR_PR = ''
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COMMIT_FORMAT = '%h %s (%an)%d'
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if os.name == 'posix': # if posix, assume we can use basic terminal escapes
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ATTR_RESET = '\033[0m'
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ATTR_PR = '\033[1;36m'
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COMMIT_FORMAT = '%C(bold blue)%h%Creset %s %C(cyan)(%an)%Creset%C(green)%d%Creset'
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def git_config_get(option, default=None):
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'''
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Get named configuration option from git repository.
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'''
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try:
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return subprocess.check_output([GIT,'config','--get',option]).rstrip().decode('utf-8')
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except subprocess.CalledProcessError as e:
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return default
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def retrieve_pr_info(repo,pull):
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'''
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Retrieve pull request information from github.
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Return None if no title can be found, or an error happens.
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'''
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try:
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req = Request("https://api.github.com/repos/"+repo+"/pulls/"+pull)
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result = urlopen(req)
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reader = codecs.getreader('utf-8')
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obj = json.load(reader(result))
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return obj
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except Exception as e:
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print('Warning: unable to retrieve pull information from github: %s' % e)
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return None
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def ask_prompt(text):
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print(text,end=" ",file=stderr)
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stderr.flush()
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reply = stdin.readline().rstrip()
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print("",file=stderr)
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return reply
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def get_symlink_files():
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files = sorted(subprocess.check_output([GIT, 'ls-tree', '--full-tree', '-r', 'HEAD']).splitlines())
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ret = []
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for f in files:
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if (int(f.decode('utf-8').split(" ")[0], 8) & 0o170000) == 0o120000:
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ret.append(f.decode('utf-8').split("\t")[1])
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return ret
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def tree_sha512sum(commit='HEAD'):
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# request metadata for entire tree, recursively
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files = []
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blob_by_name = {}
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for line in subprocess.check_output([GIT, 'ls-tree', '--full-tree', '-r', commit]).splitlines():
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name_sep = line.index(b'\t')
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metadata = line[:name_sep].split() # perms, 'blob', blobid
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assert(metadata[1] == b'blob')
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name = line[name_sep+1:]
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files.append(name)
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blob_by_name[name] = metadata[2]
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files.sort()
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# open connection to git-cat-file in batch mode to request data for all blobs
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# this is much faster than launching it per file
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p = subprocess.Popen([GIT, 'cat-file', '--batch'], stdout=subprocess.PIPE, stdin=subprocess.PIPE)
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overall = hashlib.sha512()
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for f in files:
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blob = blob_by_name[f]
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# request blob
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p.stdin.write(blob + b'\n')
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p.stdin.flush()
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# read header: blob, "blob", size
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reply = p.stdout.readline().split()
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assert(reply[0] == blob and reply[1] == b'blob')
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size = int(reply[2])
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# hash the blob data
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intern = hashlib.sha512()
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ptr = 0
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while ptr < size:
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bs = min(65536, size - ptr)
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piece = p.stdout.read(bs)
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if len(piece) == bs:
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intern.update(piece)
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else:
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raise IOError('Premature EOF reading git cat-file output')
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ptr += bs
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dig = intern.hexdigest()
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assert(p.stdout.read(1) == b'\n') # ignore LF that follows blob data
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# update overall hash with file hash
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overall.update(dig.encode("utf-8"))
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overall.update(" ".encode("utf-8"))
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overall.update(f)
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overall.update("\n".encode("utf-8"))
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p.stdin.close()
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if p.wait():
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raise IOError('Non-zero return value executing git cat-file')
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return overall.hexdigest()
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def print_merge_details(pull, title, branch, base_branch, head_branch):
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print('%s#%s%s %s %sinto %s%s' % (ATTR_RESET+ATTR_PR,pull,ATTR_RESET,title,ATTR_RESET+ATTR_PR,branch,ATTR_RESET))
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subprocess.check_call([GIT,'log','--graph','--topo-order','--pretty=format:'+COMMIT_FORMAT,base_branch+'..'+head_branch])
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def parse_arguments():
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epilog = '''
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In addition, you can set the following git configuration variables:
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githubmerge.repository (mandatory),
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user.signingkey (mandatory),
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githubmerge.host (default: git@github.com),
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githubmerge.branch (no default),
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githubmerge.testcmd (default: none).
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'''
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parser = argparse.ArgumentParser(description='Utility to merge, sign and push github pull requests',
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epilog=epilog)
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parser.add_argument('pull', metavar='PULL', type=int, nargs=1,
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help='Pull request ID to merge')
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parser.add_argument('branch', metavar='BRANCH', type=str, nargs='?',
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default=None, help='Branch to merge against (default: githubmerge.branch setting, or base branch for pull, or \'master\')')
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return parser.parse_args()
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def main():
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# Extract settings from git repo
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repo = git_config_get('githubmerge.repository')
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host = git_config_get('githubmerge.host','git@github.com')
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opt_branch = git_config_get('githubmerge.branch',None)
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testcmd = git_config_get('githubmerge.testcmd')
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signingkey = git_config_get('user.signingkey')
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if repo is None:
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print("ERROR: No repository configured. Use this command to set:", file=stderr)
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print("git config githubmerge.repository <owner>/<repo>", file=stderr)
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exit(1)
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if signingkey is None:
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print("ERROR: No GPG signing key set. Set one using:",file=stderr)
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print("git config --global user.signingkey <key>",file=stderr)
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exit(1)
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host_repo = host+":"+repo # shortcut for push/pull target
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# Extract settings from command line
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args = parse_arguments()
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pull = str(args.pull[0])
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# Receive pull information from github
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info = retrieve_pr_info(repo,pull)
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if info is None:
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exit(1)
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title = info['title'].strip()
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body = info['body'].strip()
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# precedence order for destination branch argument:
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# - command line argument
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# - githubmerge.branch setting
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# - base branch for pull (as retrieved from github)
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# - 'master'
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branch = args.branch or opt_branch or info['base']['ref'] or 'master'
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# Initialize source branches
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head_branch = 'pull/'+pull+'/head'
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base_branch = 'pull/'+pull+'/base'
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merge_branch = 'pull/'+pull+'/merge'
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local_merge_branch = 'pull/'+pull+'/local-merge'
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devnull = open(os.devnull,'w')
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try:
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subprocess.check_call([GIT,'checkout','-q',branch])
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except subprocess.CalledProcessError as e:
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print("ERROR: Cannot check out branch %s." % (branch), file=stderr)
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exit(3)
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try:
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subprocess.check_call([GIT,'fetch','-q',host_repo,'+refs/pull/'+pull+'/*:refs/heads/pull/'+pull+'/*'])
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except subprocess.CalledProcessError as e:
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print("ERROR: Cannot find pull request #%s on %s." % (pull,host_repo), file=stderr)
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exit(3)
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try:
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subprocess.check_call([GIT,'log','-q','-1','refs/heads/'+head_branch], stdout=devnull, stderr=stdout)
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except subprocess.CalledProcessError as e:
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print("ERROR: Cannot find head of pull request #%s on %s." % (pull,host_repo), file=stderr)
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exit(3)
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try:
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subprocess.check_call([GIT,'log','-q','-1','refs/heads/'+merge_branch], stdout=devnull, stderr=stdout)
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except subprocess.CalledProcessError as e:
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print("ERROR: Cannot find merge of pull request #%s on %s." % (pull,host_repo), file=stderr)
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exit(3)
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try:
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subprocess.check_call([GIT,'fetch','-q',host_repo,'+refs/heads/'+branch+':refs/heads/'+base_branch])
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except subprocess.CalledProcessError as e:
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print("ERROR: Cannot find branch %s on %s." % (branch,host_repo), file=stderr)
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exit(3)
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subprocess.check_call([GIT,'checkout','-q',base_branch])
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subprocess.call([GIT,'branch','-q','-D',local_merge_branch], stderr=devnull)
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subprocess.check_call([GIT,'checkout','-q','-b',local_merge_branch])
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try:
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# Go up to the repository's root.
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toplevel = subprocess.check_output([GIT,'rev-parse','--show-toplevel']).strip()
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os.chdir(toplevel)
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# Create unsigned merge commit.
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if title:
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firstline = 'Merge #%s: %s' % (pull,title)
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else:
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firstline = 'Merge #%s' % (pull,)
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message = firstline + '\n\n'
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message += subprocess.check_output([GIT,'log','--no-merges','--topo-order','--pretty=format:%h %s (%an)',base_branch+'..'+head_branch]).decode('utf-8')
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message += '\n\nPull request description:\n\n ' + body.replace('\n', '\n ') + '\n'
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try:
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subprocess.check_call([GIT,'merge','-q','--commit','--no-edit','--no-ff','-m',message.encode('utf-8'),head_branch])
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except subprocess.CalledProcessError as e:
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print("ERROR: Cannot be merged cleanly.",file=stderr)
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subprocess.check_call([GIT,'merge','--abort'])
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exit(4)
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logmsg = subprocess.check_output([GIT,'log','--pretty=format:%s','-n','1']).decode('utf-8')
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if logmsg.rstrip() != firstline.rstrip():
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print("ERROR: Creating merge failed (already merged?).",file=stderr)
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exit(4)
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symlink_files = get_symlink_files()
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for f in symlink_files:
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print("ERROR: File %s was a symlink" % f)
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if len(symlink_files) > 0:
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exit(4)
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# Put tree SHA512 into the message
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try:
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first_sha512 = tree_sha512sum()
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message += '\n\nTree-SHA512: ' + first_sha512
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except subprocess.CalledProcessError as e:
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printf("ERROR: Unable to compute tree hash")
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exit(4)
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try:
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subprocess.check_call([GIT,'commit','--amend','-m',message.encode('utf-8')])
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except subprocess.CalledProcessError as e:
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printf("ERROR: Cannot update message.",file=stderr)
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exit(4)
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print_merge_details(pull, title, branch, base_branch, head_branch)
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print()
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# Run test command if configured.
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if testcmd:
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if subprocess.call(testcmd,shell=True):
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print("ERROR: Running %s failed." % testcmd,file=stderr)
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exit(5)
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# Show the created merge.
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diff = subprocess.check_output([GIT,'diff',merge_branch+'..'+local_merge_branch])
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subprocess.check_call([GIT,'diff',base_branch+'..'+local_merge_branch])
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if diff:
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print("WARNING: merge differs from github!",file=stderr)
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reply = ask_prompt("Type 'ignore' to continue.")
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if reply.lower() == 'ignore':
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print("Difference with github ignored.",file=stderr)
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else:
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exit(6)
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else:
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# Verify the result manually.
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print("Dropping you on a shell so you can try building/testing the merged source.",file=stderr)
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print("Run 'git diff HEAD~' to show the changes being merged.",file=stderr)
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print("Type 'exit' when done.",file=stderr)
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if os.path.isfile('/etc/debian_version'): # Show pull number on Debian default prompt
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os.putenv('debian_chroot',pull)
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subprocess.call([BASH,'-i'])
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second_sha512 = tree_sha512sum()
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if first_sha512 != second_sha512:
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print("ERROR: Tree hash changed unexpectedly",file=stderr)
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exit(8)
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# Sign the merge commit.
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print_merge_details(pull, title, branch, base_branch, head_branch)
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while True:
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reply = ask_prompt("Type 's' to sign off on the above merge, or 'x' to reject and exit.").lower()
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if reply == 's':
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try:
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subprocess.check_call([GIT,'commit','-q','--gpg-sign','--amend','--no-edit'])
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break
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except subprocess.CalledProcessError as e:
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print("Error while signing, asking again.",file=stderr)
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elif reply == 'x':
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print("Not signing off on merge, exiting.",file=stderr)
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exit(1)
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# Put the result in branch.
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subprocess.check_call([GIT,'checkout','-q',branch])
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subprocess.check_call([GIT,'reset','-q','--hard',local_merge_branch])
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finally:
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# Clean up temporary branches.
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subprocess.call([GIT,'checkout','-q',branch])
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subprocess.call([GIT,'branch','-q','-D',head_branch],stderr=devnull)
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subprocess.call([GIT,'branch','-q','-D',base_branch],stderr=devnull)
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subprocess.call([GIT,'branch','-q','-D',merge_branch],stderr=devnull)
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subprocess.call([GIT,'branch','-q','-D',local_merge_branch],stderr=devnull)
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# Push the result.
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while True:
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reply = ask_prompt("Type 'push' to push the result to %s, branch %s, or 'x' to exit without pushing." % (host_repo,branch)).lower()
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if reply == 'push':
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subprocess.check_call([GIT,'push',host_repo,'refs/heads/'+branch])
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break
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elif reply == 'x':
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exit(1)
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if __name__ == '__main__':
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main()
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