redesign to use force pushes only if necessary, to avoid race conditions, and to add email reports
This commit is contained in:
Ralf Jung
parent
7373610f7e
commit
503462ba44
5 changed files with 276 additions and 196 deletions
156
git_mirror.py
Normal file
156
git_mirror.py
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@ -0,0 +1,156 @@
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import sys, os, subprocess
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import configparser, itertools, json, re
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import email.mime.text, email.utils, smtplib
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class GitCommand:
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def __getattr__(self, name):
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def call(*args, capture_stderr = False, check = True):
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'''If <capture_stderr>, return stderr merged with stdout. Otherwise, return stdout and forward stderr to our own.
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If <check> is true, throw an exception of the process fails with non-zero exit code. Otherwise, do not.
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In any case, return a pair of the captured output and the exit code.'''
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cmd = ["git", name.replace('_', '-')] + list(args)
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with subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.STDOUT if capture_stderr else None) as p:
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(stdout, stderr) = p.communicate()
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assert stderr is None
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code = p.returncode
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if check and code:
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raise Exception("Error running {0}: Non-zero exit code".format(cmd))
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return (stdout.decode('utf-8').strip('\n'), code)
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return call
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git = GitCommand()
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git_nullsha = 40*"0"
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def git_is_forced_update(oldsha, newsha):
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out, code = git.merge_base("--is-ancestor", oldsha, newsha, check = False) # "Check if the first <commit> is an ancestor of the second <commit>"
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assert not out
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assert code in (0, 1)
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return False if code == 0 else True # if oldsha is an ancestor of newsha, then this was a "good" (non-forced) update
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def read_config(fname, defSection = 'DEFAULT'):
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'''Reads a config file that may have options outside of any section.'''
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config = configparser.ConfigParser()
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with open(fname) as file:
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stream = itertools.chain(("["+defSection+"]\n",), file)
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config.read_file(stream)
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return config
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def send_mail(subject, text, receivers, sender='post+webhook@ralfj.de', replyTo=None):
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assert isinstance(receivers, list)
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if not len(receivers): return # nothing to do
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# construct content
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msg = email.mime.text.MIMEText(text.encode('UTF-8'), 'plain', 'UTF-8')
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msg['Subject'] = subject
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msg['Date'] = email.utils.formatdate(localtime=True)
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msg['From'] = sender
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msg['To'] = ', '.join(receivers)
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if replyTo is not None:
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msg['Reply-To'] = replyTo
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# put into envelope and send
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s = smtplib.SMTP('localhost')
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s.sendmail(sender, receivers, msg.as_string())
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s.quit()
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def get_github_payload():
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'''Reeturn the github-style JSON encoded payload (as if we were called as a github webhook)'''
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try:
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data = sys.stdin.buffer.read()
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data = json.loads(data.decode('utf-8'))
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return data
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except:
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return {} # nothing read
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class Repo:
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def __init__(self, name, conf):
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'''Creates a repository from a section of the git-mirror configuration file'''
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self.name = name
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self.local = conf['local']
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self.owner = conf['owner'] # email address to notify in case of problems
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self.mirrors = {} # maps mirrors to their URLs
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mirror_prefix = 'mirror-'
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for name in filter(lambda s: s.startswith(mirror_prefix), conf.keys()):
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mirror = name[len(mirror_prefix):]
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self.mirrors[mirror] = conf[name]
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def mail_owner(self, msg):
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send_mail("git-mirror {0}".format(self.name), msg, [self.owner])
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def find_mirror_by_url(self, match_urls):
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for mirror, url in self.mirrors.items():
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if url in match_urls:
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return mirror
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return None
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def update_mirrors(self, ref, oldsha, newsha, except_mirrors = [], suppress_stderr = False):
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'''Update the <ref> from <oldsha> to <newsha> on all mirrors. The update must already have happened locally.'''
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assert len(oldsha) == 40 and len(newsha) == 40, "These are not valid SHAs."
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os.chdir(self.local)
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# check for a forced update
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is_forced = newsha != git_nullsha and oldsha != git_nullsha and git_is_forced_update(oldsha, newsha)
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# tell all the mirrors
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for mirror in self.mirrors:
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if mirror in except_mirrors:
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continue
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# update this mirror
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if is_forced:
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# forcibly update ref remotely (someone already did a force push and hence accepted data loss)
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git.push('--force', self.mirrors[mirror], newsha+":"+ref, capture_stderr = suppress_stderr)
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else:
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# nicely update ref remotely (this avoids data loss due to race conditions)
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git.push(self.mirrors[mirror], newsha+":"+ref, capture_stderr = suppress_stderr)
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def update_ref_from_mirror(self, ref, oldsha, newsha, mirror, suppress_stderr = False):
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'''Update the local version of this <ref> to what's currently on the given <mirror>. <oldsha> and <newsha> are checked. Then update all the other mirrors.'''
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os.chdir(self.local)
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url = self.mirrors[mirror]
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# first check whether the remote really is at newsha
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remote_state, code = git.ls_remote(url, ref)
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if remote_state:
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remote_sha = remote_state.split()[0]
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else:
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remote_sha = git_nullsha
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assert newsha == remote_sha, "Someone lied about the new SHA, which should be {0}.".format(newsha)
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# locally, we have to be at oldsha or newsha (the latter can happen if we already got this update, e.g. if it originated from us)
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local_state, code = git.show_ref(ref, check=False)
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if code == 0:
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local_sha = local_state.split()[0]
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else:
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if len(local_state):
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raise Exception("Something went wrong getting the local state of {0}.".format(ref))
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local_sha = git_nullsha
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assert local_sha in (oldsha, newsha), "Someone lied about the old SHA."
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# if we are already at newsha locally, we also ran the local hooks, so we do not have to do anything
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if local_sha == newsha:
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return
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# update local state from local_sha to newsha.
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if newsha != git_nullsha:
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# We *could* now fetch the remote ref and immediately update the local one. However, then we would have to
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# decide whether we want to allow a force-update or not. Also, the ref could already have changed remotely,
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# so that may update to some other commit.
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# Instead, we just fetch without updating any local ref. If the remote side changed in such a way that
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# <newsha> is not actually fetched, that's a race and will be noticed when updating the local ref.
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git.fetch(url, ref, capture_stderr = suppress_stderr)
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# now update the ref, checking the old value is still local_oldsha.
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git.update_ref(ref, newsha, 40*"0" if local_sha is None else local_sha)
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else:
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# ref does not exist anymore. delete it.
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assert local_sha != git_nullsha, "Why didn't we bail out earlier if there is nothing to do...?"
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git.update_ref("-d", ref, local_sha) # this checks that the old value is still local_sha
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# update all the mirrors
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self.update_mirrors(ref, oldsha, newsha, [mirror], suppress_stderr)
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def find_repo_by_directory(repos, dir):
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for (name, repo) in repos.items():
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if dir == repo.local:
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return name
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return None
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def load_repos():
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conffile = os.path.join(os.path.dirname(__file__), 'git-mirror.conf')
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conf = read_config(conffile)
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repos = {}
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for name, section in conf.items():
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if name != 'DEFAULT':
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repos[name] = Repo(name, section)
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return repos
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51
githook.py
Executable file
51
githook.py
Executable file
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@ -0,0 +1,51 @@
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#!/usr/bin/python3
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# Copyright (c) 2014, Ralf Jung <post@ralfj.de>
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are met:
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#
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# 1. Redistributions of source code must retain the above copyright notice, this
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# list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright notice,
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# this list of conditions and the following disclaimer in the documentation
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# and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
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# ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#==============================================================================
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# This is the hook called by git post-commit. It updats all mirrors to the status of the local repository.
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import traceback
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from git_mirror import *
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if __name__ == "__main__":
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repo = None # we will try to use this during exception handling
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try:
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repos = load_repos()
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# find the repository we are dealing with
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reponame = find_repo_by_directory(repos, os.getcwd())
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if reponame is None or reponame not in repos:
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raise Exception("Unknown repository.")
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# now sync this repository
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repo = repos[reponame]
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# parse the information we get from stdin. we trust this information.
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for line in sys.stdin:
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(oldsha, newsha, ref) = line.split()
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repo.update_mirrors(ref, oldsha, newsha)
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except Exception as e:
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if repo is not None:
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repo.mail_owner("There was a problem running the git-mirror git hook:\n\n{0}".format(traceback.format_exc()))
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# do not print all the details
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sys.stderr.write("We have a problem:\n{0}".format('\n'.join(traceback.format_exception_only(type(e), e))))
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194
update.py
194
update.py
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@ -1,194 +0,0 @@
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#!/usr/bin/python3
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import sys, os, subprocess, argparse
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import configparser, itertools, json, re
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import traceback
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import email.mime.text, email.utils, smtplib
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class GitCommand:
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def __getattr__(self, name):
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def call(*args, capture_stderr = False, check = True):
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'''If <capture_stderr>, return stderr merged with stdout. Otherwise, return stdout and forward stderr to our own.
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If <check> is true, throw an exception of the process fails with non-zero exit code. Otherwise, do not.
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In any case, return a pair of the captured output and the exit code.'''
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cmd = ["git", name.replace('_', '-')] + list(args)
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with subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.STDOUT if capture_stderr else None) as p:
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(stdout, stderr) = p.communicate()
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assert stderr is None
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code = p.returncode
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if check and code:
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raise Exception("Error running {0}: Non-zero exit code".format(cmd))
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return (stdout.decode('utf-8').strip('\n'), code)
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return call
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git = GitCommand()
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def read_config(fname, defSection = 'DEFAULT'):
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'''Reads a config file that may have options outside of any section.'''
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config = configparser.ConfigParser()
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with open(fname) as file:
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stream = itertools.chain(("["+defSection+"]\n",), file)
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config.read_file(stream)
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return config
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def send_mail(subject, text, receivers, sender='post+webhook@ralfj.de', replyTo=None):
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assert isinstance(receivers, list)
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if not len(receivers): return # nothing to do
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# construct content
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msg = email.mime.text.MIMEText(text.encode('UTF-8'), 'plain', 'UTF-8')
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msg['Subject'] = subject
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msg['Date'] = email.utils.formatdate(localtime=True)
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msg['From'] = sender
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msg['To'] = ', '.join(receivers)
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if replyTo is not None:
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msg['Reply-To'] = replyTo
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# put into envelope and send
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s = smtplib.SMTP('localhost')
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s.sendmail(sender, receivers, msg.as_string())
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s.quit()
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def get_github_payload():
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'''Reeturn the github-style JSON encoded payload (as if we were called as a github webhook)'''
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try:
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data = sys.stdin.buffer.read()
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data = json.loads(data.decode('utf-8'))
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return data
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except:
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return {} # nothing read
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class Repo:
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def __init__(self, conf):
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'''Creates a repository from a section of the git-mirror configuration file'''
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self.local = conf['local']
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self.mirrors = {} # maps mirrors to their URLs
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mirror_prefix = 'mirror-'
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for name in filter(lambda s: s.startswith(mirror_prefix), conf.keys()):
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mirror = name[len(mirror_prefix):]
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self.mirrors[mirror] = conf[name]
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def find_mirror_by_url(self, match_urls):
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for mirror, url in self.mirrors.items():
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if url in match_urls:
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return mirror
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return None
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def have_ref(self, ref, url=None):
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'''Tests if a given ref exists, locally or (if the url is given) remotely'''
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if url is None:
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out, code = git.show_ref(ref, check = False)
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if code and len(out):
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raise Exception("Checking for a local ref failed")
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else:
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out, code = git.ls_remote(url, ref)
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# the ref exists iff we have output
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return len(out) > 0
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def update_mirrors(self, ref, delete, exception = None, suppress_stderr = False):
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'''Update <ref> on all mirrors except for <exception> to the local state, or delete it.'''
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for mirror in self.mirrors:
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if mirror == exception:
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continue
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# update this mirror
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if not self.have_ref(ref):
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# delete ref remotely
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git.push(self.mirrors[mirror], ':'+ref, capture_stderr = suppress_stderr)
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else:
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# update ref remotely
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git.push('--force', self.mirrors[mirror], ref, capture_stderr = suppress_stderr)
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def update_ref(self, ref, source, suppress_stderr = False):
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'''Update the <ref> to its state in <source> everywhere. <source> is None to refer to the local repository,
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or the name of a mirror.'''
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os.chdir(self.local)
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if source is None:
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# We already have the latest version locally. Update all the mirrors.
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self.update_mirrors(ref, delete = not self.have_ref(ref), suppress_stderr = suppress_stderr)
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else:
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# update our version of this ref. This may fail if the ref does not exist anymore.
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url = self.mirrors[source]
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if not self.have_ref(ref, url):
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# delete ref locally
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git.update_ref("-d", ref)
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# and everywhere (except for the source)
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self.update_mirrors(ref, delete = True, exception = source, suppress_stderr = suppress_stderr)
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else:
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# update local ref to remote state (yes, there's a race condition here - the ref could no longer exist by now)
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git.fetch(url, ref+":"+ref)
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# and everywhere else
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self.update_mirrors(ref, delete = False, exception = source, suppress_stderr = suppress_stderr)
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def find_repo_by_directory(repos, dir):
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for (name, repo) in repos.items():
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if dir == repo.local:
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return name
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return None
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if __name__ == "__main__":
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parser = argparse.ArgumentParser(description='Keep git repositories in sync')
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parser.add_argument("--git-hook",
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action="store_true", dest="git_hook",
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help="Act as git hook: Auto-detect the repository based on the working directoy, and fetch information from stdin the way git encodes it")
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parser.add_argument("--web-hook",
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action="store_true", dest="web_hook",
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help="Act as github-style web hook: Repository has to be given explicitly, all the rest is read from stdin JSON form")
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parser.add_argument("-r", "--repository",
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dest="repository",
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help="The name of the repository to act on")
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args = parser.parse_args()
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if args.git_hook and args.web_hook:
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raise Exception("I cannot be two hooks at once.")
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try:
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# All arguments are *untrusted* input, as we may be called via sudo from the webserver. So we fix the configuration file location.
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conffile = os.path.join(os.path.dirname(__file__), 'git-mirror.conf')
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conf = read_config(conffile)
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repos = {}
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for name, section in conf.items():
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if name != 'DEFAULT':
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repos[name] = Repo(section)
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# find the repository we are dealing with
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reponame = args.repository
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if reponame is None and args.git_hook:
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reponame = find_repo_by_directory(repos, os.getcwd())
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if reponame is None or reponame not in repos:
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raise Exception("Unknown or missing repository name.")
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# now sync this repository
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repo = repos[reponame]
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if args.git_hook:
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# parse the information we get from stdin
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for line in sys.stdin:
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(oldsha, newsha, ref) = line.split()
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repo.update_ref(ref, source = None)
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elif args.web_hook:
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data = get_github_payload()
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ref = data["ref"]
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# validate the ref name
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if re.match('refs/[a-z/]+', ref) is None:
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raise Exception("Invalid ref name {0}".format(ref))
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# collect URLs of this repository
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urls = []
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for key in ("git_url", "ssh_url", "clone_url"):
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urls.append(data["repository"][key])
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source = repo.find_mirror_by_url(urls)
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if source is None:
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raise Exception("Could not find the source.")
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repo.update_ref(ref, source = source, suppress_stderr = True)
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# print an answer
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print("Content-Type: text/plain")
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print()
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print("Updated {0}:{1} from source {2}".format(reponame, ref, source))
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else:
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raise Exception("No manual mode is implemented so far.")
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except Exception as e:
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# don't leak filenames etc. when we are running as a hook
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if args.web_hook:
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print("Status: 500 Internal Server Error")
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print("Content-Type: text/plain")
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print()
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print(str(e))
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elif args.git_hook:
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#sys.stderr.write(str(e))
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traceback.print_exc()
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else:
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traceback.print_exc()
|
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66
webhook-core.py
Executable file
66
webhook-core.py
Executable file
|
|
@ -0,0 +1,66 @@
|
|||
#!/usr/bin/python3
|
||||
# Copyright (c) 2014, Ralf Jung <post@ralfj.de>
|
||||
# All rights reserved.
|
||||
#
|
||||
# Redistribution and use in source and binary forms, with or without
|
||||
# modification, are permitted provided that the following conditions are met:
|
||||
#
|
||||
# 1. Redistributions of source code must retain the above copyright notice, this
|
||||
# list of conditions and the following disclaimer.
|
||||
# 2. Redistributions in binary form must reproduce the above copyright notice,
|
||||
# this list of conditions and the following disclaimer in the documentation
|
||||
# and/or other materials provided with the distribution.
|
||||
#
|
||||
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
|
||||
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
||||
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
||||
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
|
||||
# ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
||||
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
||||
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
|
||||
# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
||||
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
||||
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
#==============================================================================
|
||||
|
||||
# This is the hook called by git post-commit. It updats all mirrors to the status of the local repository.
|
||||
import sys, traceback
|
||||
from git_mirror import *
|
||||
|
||||
if __name__ == "__main__":
|
||||
repo = None # we will try to use this during exception handling
|
||||
try:
|
||||
repos = load_repos()
|
||||
reponame = sys.argv[1] if len(sys.argv) > 1 else None
|
||||
if reponame not in repos:
|
||||
raise Exception("Repository missing or not found.")
|
||||
repo = repos[reponame]
|
||||
|
||||
# now sync this repository
|
||||
data = get_github_payload()
|
||||
ref = data["ref"]
|
||||
oldsha = data["before"]
|
||||
newsha = data["after"]
|
||||
# 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, to find the mirror name
|
||||
urls = []
|
||||
for key in ("git_url", "ssh_url", "clone_url"):
|
||||
urls.append(data["repository"][key])
|
||||
mirror = repo.find_mirror_by_url(urls)
|
||||
if mirror is None:
|
||||
raise Exception("Could not find the mirror.")
|
||||
repo.update_ref_from_mirror(ref, oldsha, newsha, mirror, suppress_stderr = True)
|
||||
# print an answer
|
||||
print("Content-Type: text/plain")
|
||||
print()
|
||||
print("Updated {0}:{1} from mirror {2} from {3} to {4}".format(reponame, ref, mirror, oldsha, newsha))
|
||||
except Exception as e:
|
||||
if repo is not None:
|
||||
repo.mail_owner("There was a problem running the git-mirror webhook:\n\n{0}".format(traceback.format_exc()))
|
||||
# do not print all the details
|
||||
print("Status: 500 Internal Server Error")
|
||||
print("Content-Type: text/plain")
|
||||
print()
|
||||
print("We have a problem:\n{0}".format('\n'.join(traceback.format_exception_only(type(e), e))))
|
||||
|
|
@ -10,6 +10,7 @@ def is_github(remote_addr):
|
|||
for net in github['hooks']:
|
||||
if remote_addr in ip_network(net):
|
||||
return True
|
||||
return False
|
||||
|
||||
# get repository from query string
|
||||
query = os.getenv("QUERY_STRING")
|
||||
|
|
@ -18,5 +19,5 @@ repository = query.get('repository', [])
|
|||
repository = repository[0] if len(repository) else ''
|
||||
|
||||
# execute the actual script
|
||||
git_mirror = "/home/ralf/git-mirror/update.py"
|
||||
os.execlp("sudo", "sudo", "-n", "-u", "git", git_mirror, "--web-hook", "--repository", repository)
|
||||
webhook_core = "/home/ralf/git-mirror/webhook-core.py"
|
||||
os.execlp("sudo", "sudo", "-n", "-u", "git", webhook_core, repository)
|
||||
|
|
|
|||
Loading…
Add table
Reference in a new issue