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Diffstat (limited to 'contrib/devtools/github-merge.py')
| -rwxr-xr-x | contrib/devtools/github-merge.py | 330 |
1 files changed, 330 insertions, 0 deletions
diff --git a/contrib/devtools/github-merge.py b/contrib/devtools/github-merge.py new file mode 100755 index 0000000000..2941d2cb6d --- /dev/null +++ b/contrib/devtools/github-merge.py @@ -0,0 +1,330 @@ +#!/usr/bin/env python3 +# Copyright (c) 2016-2017 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 +from sys import stdin,stdout,stderr +import argparse +import hashlib +import subprocess +import sys +import json,codecs +try: + from urllib.request import Request,urlopen +except: + from urllib2 import Request,urlopen + +# External tools (can be overridden using environment) +GIT = os.getenv('GIT','git') +BASH = os.getenv('BASH','bash') + +# OS specific configuration for terminal attributes +ATTR_RESET = '' +ATTR_PR = '' +COMMIT_FORMAT = '%h %s (%an)%d' +if os.name == 'posix': # if posix, assume we can use basic terminal escapes + ATTR_RESET = '\033[0m' + ATTR_PR = '\033[1;36m' + COMMIT_FORMAT = '%C(bold blue)%h%Creset %s %C(cyan)(%an)%Creset%C(green)%d%Creset' + +def git_config_get(option, default=None): + ''' + Get named configuration option from git repository. + ''' + try: + return subprocess.check_output([GIT,'config','--get',option]).rstrip().decode('utf-8') + except subprocess.CalledProcessError as e: + return default + +def retrieve_pr_info(repo,pull): + ''' + Retrieve pull request information from github. + Return None if no title can be found, or an error happens. + ''' + try: + req = Request("https://api.github.com/repos/"+repo+"/pulls/"+pull) + result = urlopen(req) + reader = codecs.getreader('utf-8') + obj = json.load(reader(result)) + return obj + except Exception as e: + print('Warning: unable to retrieve pull information from github: %s' % e) + return None + +def ask_prompt(text): + print(text,end=" ",file=stderr) + stderr.flush() + reply = stdin.readline().rstrip() + print("",file=stderr) + return reply + +def get_symlink_files(): + files = sorted(subprocess.check_output([GIT, 'ls-tree', '--full-tree', '-r', 'HEAD']).splitlines()) + ret = [] + for f in files: + if (int(f.decode('utf-8').split(" ")[0], 8) & 0o170000) == 0o120000: + ret.append(f.decode('utf-8').split("\t")[1]) + return ret + +def tree_sha512sum(commit='HEAD'): + # request metadata for entire tree, recursively + files = [] + blob_by_name = {} + for line in subprocess.check_output([GIT, 'ls-tree', '--full-tree', '-r', commit]).splitlines(): + name_sep = line.index(b'\t') + metadata = line[:name_sep].split() # perms, 'blob', blobid + assert(metadata[1] == b'blob') + name = line[name_sep+1:] + files.append(name) + blob_by_name[name] = metadata[2] + + files.sort() + # open connection to git-cat-file in batch mode to request data for all blobs + # this is much faster than launching it per file + p = subprocess.Popen([GIT, 'cat-file', '--batch'], stdout=subprocess.PIPE, stdin=subprocess.PIPE) + overall = hashlib.sha512() + for f in files: + blob = blob_by_name[f] + # request blob + p.stdin.write(blob + b'\n') + p.stdin.flush() + # read header: blob, "blob", size + reply = p.stdout.readline().split() + assert(reply[0] == blob and reply[1] == b'blob') + size = int(reply[2]) + # hash the blob data + intern = hashlib.sha512() + ptr = 0 + while ptr < size: + bs = min(65536, size - ptr) + piece = p.stdout.read(bs) + if len(piece) == bs: + intern.update(piece) + else: + raise IOError('Premature EOF reading git cat-file output') + ptr += bs + dig = intern.hexdigest() + assert(p.stdout.read(1) == b'\n') # ignore LF that follows blob data + # update overall hash with file hash + overall.update(dig.encode("utf-8")) + overall.update(" ".encode("utf-8")) + overall.update(f) + overall.update("\n".encode("utf-8")) + p.stdin.close() + if p.wait(): + raise IOError('Non-zero return value executing git cat-file') + return overall.hexdigest() + +def print_merge_details(pull, title, branch, base_branch, head_branch): + print('%s#%s%s %s %sinto %s%s' % (ATTR_RESET+ATTR_PR,pull,ATTR_RESET,title,ATTR_RESET+ATTR_PR,branch,ATTR_RESET)) + subprocess.check_call([GIT,'log','--graph','--topo-order','--pretty=format:'+COMMIT_FORMAT,base_branch+'..'+head_branch]) + +def parse_arguments(): + 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 (no default), + 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=None, help='Branch to merge against (default: githubmerge.branch setting, or base branch for pull, or \'master\')') + 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') + opt_branch = git_config_get('githubmerge.branch',None) + 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) + sys.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) + sys.exit(1) + + host_repo = host+":"+repo # shortcut for push/pull target + + # Extract settings from command line + args = parse_arguments() + pull = str(args.pull[0]) + + # Receive pull information from github + info = retrieve_pr_info(repo,pull) + if info is None: + sys.exit(1) + title = info['title'].strip() + body = info['body'].strip() + # precedence order for destination branch argument: + # - command line argument + # - githubmerge.branch setting + # - base branch for pull (as retrieved from github) + # - 'master' + branch = args.branch or opt_branch or info['base']['ref'] or 'master' + + # 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) + sys.exit(3) + try: + subprocess.check_call([GIT,'fetch','-q',host_repo,'+refs/pull/'+pull+'/*:refs/heads/pull/'+pull+'/*', + '+refs/heads/'+branch+':refs/heads/'+base_branch]) + except subprocess.CalledProcessError as e: + print("ERROR: Cannot find pull request #%s or branch %s on %s." % (pull,branch,host_repo), file=stderr) + sys.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) + sys.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) + sys.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: + # Go up to the repository's root. + toplevel = subprocess.check_output([GIT,'rev-parse','--show-toplevel']).strip() + os.chdir(toplevel) + # Create unsigned merge commit. + 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]).decode('utf-8') + message += '\n\nPull request description:\n\n ' + body.replace('\n', '\n ') + '\n' + try: + subprocess.check_call([GIT,'merge','-q','--commit','--no-edit','--no-ff','-m',message.encode('utf-8'),head_branch]) + except subprocess.CalledProcessError as e: + print("ERROR: Cannot be merged cleanly.",file=stderr) + subprocess.check_call([GIT,'merge','--abort']) + sys.exit(4) + logmsg = subprocess.check_output([GIT,'log','--pretty=format:%s','-n','1']).decode('utf-8') + if logmsg.rstrip() != firstline.rstrip(): + print("ERROR: Creating merge failed (already merged?).",file=stderr) + sys.exit(4) + + symlink_files = get_symlink_files() + for f in symlink_files: + print("ERROR: File %s was a symlink" % f) + if len(symlink_files) > 0: + sys.exit(4) + + # Put tree SHA512 into the message + try: + first_sha512 = tree_sha512sum() + message += '\n\nTree-SHA512: ' + first_sha512 + except subprocess.CalledProcessError as e: + print("ERROR: Unable to compute tree hash") + sys.exit(4) + try: + subprocess.check_call([GIT,'commit','--amend','-m',message.encode('utf-8')]) + except subprocess.CalledProcessError as e: + print("ERROR: Cannot update message.", file=stderr) + sys.exit(4) + + print_merge_details(pull, title, branch, base_branch, head_branch) + print() + + # Run test command if configured. + if testcmd: + if subprocess.call(testcmd,shell=True): + print("ERROR: Running %s failed." % testcmd,file=stderr) + sys.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: + sys.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']) + + second_sha512 = tree_sha512sum() + if first_sha512 != second_sha512: + print("ERROR: Tree hash changed unexpectedly",file=stderr) + sys.exit(8) + + # Sign the merge commit. + print_merge_details(pull, title, branch, base_branch, head_branch) + while True: + reply = ask_prompt("Type 's' to sign off on the above merge, or 'x' to reject and exit.").lower() + if reply == 's': + try: + subprocess.check_call([GIT,'commit','-q','--gpg-sign','--amend','--no-edit']) + break + except subprocess.CalledProcessError as e: + print("Error while signing, asking again.",file=stderr) + elif reply == 'x': + print("Not signing off on merge, exiting.",file=stderr) + sys.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. + while True: + reply = ask_prompt("Type 'push' to push the result to %s, branch %s, or 'x' to exit without pushing." % (host_repo,branch)).lower() + if reply == 'push': + subprocess.check_call([GIT,'push',host_repo,'refs/heads/'+branch]) + break + elif reply == 'x': + sys.exit(1) + +if __name__ == '__main__': + main() + |