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334 lines
14 KiB
334 lines
14 KiB
#!/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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