+++ /dev/null
-#!/usr/bin/python3
-import sys, os, subprocess, argparse
-import configparser, itertools, json, re
-import traceback
-import email.mime.text, email.utils, smtplib
-
-class GitCommand:
- def __getattr__(self, name):
- def call(*args, capture_stderr = False, check = True):
- '''If <capture_stderr>, return stderr merged with stdout. Otherwise, return stdout and forward stderr to our own.
- If <check> is true, throw an exception of the process fails with non-zero exit code. Otherwise, do not.
- In any case, return a pair of the captured output and the exit code.'''
- cmd = ["git", name.replace('_', '-')] + list(args)
- with subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.STDOUT if capture_stderr else None) as p:
- (stdout, stderr) = p.communicate()
- assert stderr is None
- code = p.returncode
- if check and code:
- raise Exception("Error running {0}: Non-zero exit code".format(cmd))
- return (stdout.decode('utf-8').strip('\n'), code)
- return call
-
-git = GitCommand()
-
-def read_config(fname, defSection = 'DEFAULT'):
- '''Reads a config file that may have options outside of any section.'''
- config = configparser.ConfigParser()
- with open(fname) as file:
- stream = itertools.chain(("["+defSection+"]\n",), file)
- config.read_file(stream)
- return config
-
-def send_mail(subject, text, receivers, sender='post+webhook@ralfj.de', replyTo=None):
- assert isinstance(receivers, list)
- if not len(receivers): return # nothing to do
- # construct content
- msg = email.mime.text.MIMEText(text.encode('UTF-8'), 'plain', 'UTF-8')
- msg['Subject'] = subject
- msg['Date'] = email.utils.formatdate(localtime=True)
- msg['From'] = sender
- msg['To'] = ', '.join(receivers)
- if replyTo is not None:
- msg['Reply-To'] = replyTo
- # put into envelope and send
- s = smtplib.SMTP('localhost')
- s.sendmail(sender, receivers, msg.as_string())
- s.quit()
-
-def get_github_payload():
- '''Reeturn the github-style JSON encoded payload (as if we were called as a github webhook)'''
- try:
- data = sys.stdin.buffer.read()
- data = json.loads(data.decode('utf-8'))
- return data
- except:
- return {} # nothing read
-
-class Repo:
- def __init__(self, conf):
- '''Creates a repository from a section of the git-mirror configuration file'''
- self.local = conf['local']
- self.mirrors = {} # maps mirrors to their URLs
- mirror_prefix = 'mirror-'
- for name in filter(lambda s: s.startswith(mirror_prefix), conf.keys()):
- mirror = name[len(mirror_prefix):]
- self.mirrors[mirror] = conf[name]
-
- def find_mirror_by_url(self, match_urls):
- for mirror, url in self.mirrors.items():
- if url in match_urls:
- return mirror
- return None
-
- def have_ref(self, ref, url=None):
- '''Tests if a given ref exists, locally or (if the url is given) remotely'''
- if url is None:
- out, code = git.show_ref(ref, check = False)
- if code and len(out):
- raise Exception("Checking for a local ref failed")
- else:
- out, code = git.ls_remote(url, ref)
- # the ref exists iff we have output
- return len(out) > 0
-
- def update_mirrors(self, ref, delete, exception = None, suppress_stderr = False):
- '''Update <ref> on all mirrors except for <exception> to the local state, or delete it.'''
- for mirror in self.mirrors:
- if mirror == exception:
- continue
- # update this mirror
- if not self.have_ref(ref):
- # delete ref remotely
- git.push(self.mirrors[mirror], ':'+ref, capture_stderr = suppress_stderr)
- else:
- # update ref remotely
- git.push('--force', self.mirrors[mirror], ref, capture_stderr = suppress_stderr)
-
- def update_ref(self, ref, source, suppress_stderr = False):
- '''Update the <ref> to its state in <source> everywhere. <source> is None to refer to the local repository,
- or the name of a mirror.'''
- os.chdir(self.local)
- if source is None:
- # We already have the latest version locally. Update all the mirrors.
- self.update_mirrors(ref, delete = not self.have_ref(ref), suppress_stderr = suppress_stderr)
- else:
- # update our version of this ref. This may fail if the ref does not exist anymore.
- url = self.mirrors[source]
- if not self.have_ref(ref, url):
- # delete ref locally
- git.update_ref("-d", ref)
- # and everywhere (except for the source)
- self.update_mirrors(ref, delete = True, exception = source, suppress_stderr = suppress_stderr)
- else:
- # update local ref to remote state (yes, there's a race condition here - the ref could no longer exist by now)
- git.fetch(url, ref+":"+ref)
- # and everywhere else
- self.update_mirrors(ref, delete = False, exception = source, suppress_stderr = suppress_stderr)
-
-def find_repo_by_directory(repos, dir):
- for (name, repo) in repos.items():
- if dir == repo.local:
- return name
- return None
-
-if __name__ == "__main__":
- parser = argparse.ArgumentParser(description='Keep git repositories in sync')
- parser.add_argument("--git-hook",
- action="store_true", dest="git_hook",
- help="Act as git hook: Auto-detect the repository based on the working directoy, and fetch information from stdin the way git encodes it")
- parser.add_argument("--web-hook",
- action="store_true", dest="web_hook",
- help="Act as github-style web hook: Repository has to be given explicitly, all the rest is read from stdin JSON form")
- parser.add_argument("-r", "--repository",
- dest="repository",
- help="The name of the repository to act on")
- args = parser.parse_args()
- if args.git_hook and args.web_hook:
- raise Exception("I cannot be two hooks at once.")
-
- try:
- # All arguments are *untrusted* input, as we may be called via sudo from the webserver. So we fix the configuration file location.
- conffile = os.path.join(os.path.dirname(__file__), 'git-mirror.conf')
- conf = read_config(conffile)
- repos = {}
- for name, section in conf.items():
- if name != 'DEFAULT':
- repos[name] = Repo(section)
-
- # find the repository we are dealing with
- reponame = args.repository
- if reponame is None and args.git_hook:
- reponame = find_repo_by_directory(repos, os.getcwd())
- if reponame is None or reponame not in repos:
- raise Exception("Unknown or missing repository name.")
-
- # now sync this repository
- repo = repos[reponame]
- if args.git_hook:
- # parse the information we get from stdin
- for line in sys.stdin:
- (oldsha, newsha, ref) = line.split()
- repo.update_ref(ref, source = None)
- elif args.web_hook:
- data = get_github_payload()
- ref = data["ref"]
- # validate the ref name
- if re.match('refs/[a-z/]+', ref) is None:
- raise Exception("Invalid ref name {0}".format(ref))
- # collect URLs of this repository
- urls = []
- for key in ("git_url", "ssh_url", "clone_url"):
- urls.append(data["repository"][key])
- source = repo.find_mirror_by_url(urls)
- if source is None:
- raise Exception("Could not find the source.")
- repo.update_ref(ref, source = source, suppress_stderr = True)
- # print an answer
- print("Content-Type: text/plain")
- print()
- print("Updated {0}:{1} from source {2}".format(reponame, ref, source))
- else:
- raise Exception("No manual mode is implemented so far.")
- except Exception as e:
- # don't leak filenames etc. when we are running as a hook
- if args.web_hook:
- print("Status: 500 Internal Server Error")
- print("Content-Type: text/plain")
- print()
- print(str(e))
- elif args.git_hook:
- #sys.stderr.write(str(e))
- traceback.print_exc()
- else:
- traceback.print_exc()
projects / git-mirror.git / blobdiff