10d3ae102a
As we are already using the API to retrieve the pull request title, also retrieve the base branch. This makes sure that pull requests for 0.12 automatically end up in 0.12, and pull requests for master automatically end up in master, and so on. It is still possible to override the branch from the command line or using the `githubmerge.branch` git option.
252 lines
11 KiB
Python
Executable file
252 lines
11 KiB
Python
Executable file
#!/usr/bin/env python3
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# Copyright (c) 2016 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,sys
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from sys import stdin,stdout,stderr
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import argparse
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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 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']
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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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# 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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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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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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print()
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# Run test command if configured.
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if testcmd:
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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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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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reply = ask_prompt("Press 'd' to accept the diff.")
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if reply.lower() == 'd':
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print("Diff accepted.",file=stderr)
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else:
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print("ERROR: Diff rejected.",file=stderr)
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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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reply = ask_prompt("Type 'm' to accept the merge.")
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if reply.lower() == 'm':
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print("Merge accepted.",file=stderr)
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else:
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print("ERROR: Merge rejected.",file=stderr)
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exit(7)
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# Sign the merge commit.
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reply = ask_prompt("Type 's' to sign off on the merge.")
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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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except subprocess.CalledProcessError as e:
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print("Error signing, exiting.",file=stderr)
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exit(1)
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else:
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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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reply = ask_prompt("Type 'push' to push the result to %s, branch %s." % (host_repo,branch))
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if reply.lower() == 'push':
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subprocess.check_call([GIT,'push',host_repo,'refs/heads/'+branch])
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if __name__ == '__main__':
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main()
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