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+#!/usr/bin/env python2
+# Copyright (c) 2016 Bitcoin Core Developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+# This script will locally construct a merge commit for a pull request on a
+# github repository, inspect it, sign it and optionally push it.
+
+# The following temporary branches are created/overwritten and deleted:
+# * pull/$PULL/base (the current master we're merging onto)
+# * pull/$PULL/head (the current state of the remote pull request)
+# * pull/$PULL/merge (github's merge)
+# * pull/$PULL/local-merge (our merge)
+
+# In case of a clean merge that is accepted by the user, the local branch with
+# name $BRANCH is overwritten with the merged result, and optionally pushed.
+from __future__ import division,print_function,unicode_literals
+import os,sys
+from sys import stdin,stdout,stderr
+import argparse
+import subprocess
+
+# External tools (can be overridden using environment)
+GIT = os.getenv('GIT','git')
+BASH = os.getenv('BASH','bash')
+
+def git_config_get(option, default=None):
+ '''
+ Get named configuration option from git repository.
+ '''
+ try:
+ return subprocess.check_output([GIT,'config','--get',option]).rstrip()
+ except subprocess.CalledProcessError as e:
+ return default
+
+def retrieve_pr_title(repo,pull):
+ '''
+ Retrieve pull request title from github.
+ Return None if no title can be found, or an error happens.
+ '''
+ import urllib2,json
+ try:
+ req = urllib2.Request("https://api.github.com/repos/"+repo+"/pulls/"+pull)
+ result = urllib2.urlopen(req)
+ result = json.load(result)
+ return result['title']
+ except Exception as e:
+ print('Warning: unable to retrieve pull title from github: %s' % e)
+ return None
+
+def ask_prompt(text):
+ print(text,end=" ",file=stderr)
+ reply = stdin.readline().rstrip()
+ print("",file=stderr)
+ return reply
+
+def parse_arguments(branch):
+ epilog = '''
+ In addition, you can set the following git configuration variables:
+ githubmerge.repository (mandatory),
+ user.signingkey (mandatory),
+ githubmerge.host (default: git@github.com),
+ githubmerge.branch (default: master),
+ githubmerge.testcmd (default: none).
+ '''
+ parser = argparse.ArgumentParser(description='Utility to merge, sign and push github pull requests',
+ epilog=epilog)
+ parser.add_argument('pull', metavar='PULL', type=int, nargs=1,
+ help='Pull request ID to merge')
+ parser.add_argument('branch', metavar='BRANCH', type=str, nargs='?',
+ default=branch, help='Branch to merge against (default: '+branch+')')
+ return parser.parse_args()
+
+def main():
+ # Extract settings from git repo
+ repo = git_config_get('githubmerge.repository')
+ host = git_config_get('githubmerge.host','git@github.com')
+ branch = git_config_get('githubmerge.branch','master')
+ testcmd = git_config_get('githubmerge.testcmd')
+ signingkey = git_config_get('user.signingkey')
+ if repo is None:
+ print("ERROR: No repository configured. Use this command to set:", file=stderr)
+ print("git config githubmerge.repository <owner>/<repo>", file=stderr)
+ exit(1)
+ if signingkey is None:
+ print("ERROR: No GPG signing key set. Set one using:",file=stderr)
+ print("git config --global user.signingkey <key>",file=stderr)
+ exit(1)
+
+ host_repo = host+":"+repo # shortcut for push/pull target
+
+ # Extract settings from command line
+ args = parse_arguments(branch)
+ pull = str(args.pull[0])
+ branch = args.branch
+
+ # Initialize source branches
+ head_branch = 'pull/'+pull+'/head'
+ base_branch = 'pull/'+pull+'/base'
+ merge_branch = 'pull/'+pull+'/merge'
+ local_merge_branch = 'pull/'+pull+'/local-merge'
+
+ devnull = open(os.devnull,'w')
+ try:
+ subprocess.check_call([GIT,'checkout','-q',branch])
+ except subprocess.CalledProcessError as e:
+ print("ERROR: Cannot check out branch %s." % (branch), file=stderr)
+ exit(3)
+ try:
+ subprocess.check_call([GIT,'fetch','-q',host_repo,'+refs/pull/'+pull+'/*:refs/heads/pull/'+pull+'/*'])
+ except subprocess.CalledProcessError as e:
+ print("ERROR: Cannot find pull request #%s on %s." % (pull,host_repo), file=stderr)
+ exit(3)
+ try:
+ subprocess.check_call([GIT,'log','-q','-1','refs/heads/'+head_branch], stdout=devnull, stderr=stdout)
+ except subprocess.CalledProcessError as e:
+ print("ERROR: Cannot find head of pull request #%s on %s." % (pull,host_repo), file=stderr)
+ exit(3)
+ try:
+ subprocess.check_call([GIT,'log','-q','-1','refs/heads/'+merge_branch], stdout=devnull, stderr=stdout)
+ except subprocess.CalledProcessError as e:
+ print("ERROR: Cannot find merge of pull request #%s on %s." % (pull,host_repo), file=stderr)
+ exit(3)
+ try:
+ subprocess.check_call([GIT,'fetch','-q',host_repo,'+refs/heads/'+branch+':refs/heads/'+base_branch])
+ except subprocess.CalledProcessError as e:
+ print("ERROR: Cannot find branch %s on %s." % (branch,host_repo), file=stderr)
+ exit(3)
+ subprocess.check_call([GIT,'checkout','-q',base_branch])
+ subprocess.call([GIT,'branch','-q','-D',local_merge_branch], stderr=devnull)
+ subprocess.check_call([GIT,'checkout','-q','-b',local_merge_branch])
+
+ try:
+ # Create unsigned merge commit.
+ title = retrieve_pr_title(repo,pull)
+ if title:
+ firstline = 'Merge #%s: %s' % (pull,title)
+ else:
+ firstline = 'Merge #%s' % (pull,)
+ message = firstline + '\n\n'
+ message += subprocess.check_output([GIT,'log','--no-merges','--topo-order','--pretty=format:%h %s (%an)',base_branch+'..'+head_branch])
+ try:
+ subprocess.check_call([GIT,'merge','-q','--commit','--no-edit','--no-ff','-m',message,head_branch])
+ except subprocess.CalledProcessError as e:
+ print("ERROR: Cannot be merged cleanly.",file=stderr)
+ subprocess.check_call([GIT,'merge','--abort'])
+ exit(4)
+ logmsg = subprocess.check_output([GIT,'log','--pretty=format:%s','-n','1'])
+ if logmsg.rstrip() != firstline.rstrip():
+ print("ERROR: Creating merge failed (already merged?).",file=stderr)
+ exit(4)
+
+ # Run test command if configured.
+ if testcmd:
+ # Go up to the repository's root.
+ toplevel = subprocess.check_output([GIT,'rev-parse','--show-toplevel'])
+ os.chdir(toplevel)
+ if subprocess.call(testcmd,shell=True):
+ print("ERROR: Running %s failed." % testcmd,file=stderr)
+ exit(5)
+
+ # Show the created merge.
+ diff = subprocess.check_output([GIT,'diff',merge_branch+'..'+local_merge_branch])
+ subprocess.check_call([GIT,'diff',base_branch+'..'+local_merge_branch])
+ if diff:
+ print("WARNING: merge differs from github!",file=stderr)
+ reply = ask_prompt("Type 'ignore' to continue.")
+ if reply.lower() == 'ignore':
+ print("Difference with github ignored.",file=stderr)
+ else:
+ exit(6)
+ reply = ask_prompt("Press 'd' to accept the diff.")
+ if reply.lower() == 'd':
+ print("Diff accepted.",file=stderr)
+ else:
+ print("ERROR: Diff rejected.",file=stderr)
+ exit(6)
+ else:
+ # Verify the result manually.
+ print("Dropping you on a shell so you can try building/testing the merged source.",file=stderr)
+ print("Run 'git diff HEAD~' to show the changes being merged.",file=stderr)
+ print("Type 'exit' when done.",file=stderr)
+ if os.path.isfile('/etc/debian_version'): # Show pull number on Debian default prompt
+ os.putenv('debian_chroot',pull)
+ subprocess.call([BASH,'-i'])
+ reply = ask_prompt("Type 'm' to accept the merge.")
+ if reply.lower() == 'm':
+ print("Merge accepted.",file=stderr)
+ else:
+ print("ERROR: Merge rejected.",file=stderr)
+ exit(7)
+
+ # Sign the merge commit.
+ reply = ask_prompt("Type 's' to sign off on the merge.")
+ if reply == 's':
+ try:
+ subprocess.check_call([GIT,'commit','-q','--gpg-sign','--amend','--no-edit'])
+ except subprocess.CalledProcessError as e:
+ print("Error signing, exiting.",file=stderr)
+ exit(1)
+ else:
+ print("Not signing off on merge, exiting.",file=stderr)
+ exit(1)
+
+ # Put the result in branch.
+ subprocess.check_call([GIT,'checkout','-q',branch])
+ subprocess.check_call([GIT,'reset','-q','--hard',local_merge_branch])
+ finally:
+ # Clean up temporary branches.
+ subprocess.call([GIT,'checkout','-q',branch])
+ subprocess.call([GIT,'branch','-q','-D',head_branch],stderr=devnull)
+ subprocess.call([GIT,'branch','-q','-D',base_branch],stderr=devnull)
+ subprocess.call([GIT,'branch','-q','-D',merge_branch],stderr=devnull)
+ subprocess.call([GIT,'branch','-q','-D',local_merge_branch],stderr=devnull)
+
+ # Push the result.
+ reply = ask_prompt("Type 'push' to push the result to %s, branch %s." % (host_repo,branch))
+ if reply.lower() == 'push':
+ subprocess.check_call([GIT,'push',host_repo,'refs/heads/'+branch])
+
+if __name__ == '__main__':
+ main()
+