# RhodeCode VCSServer provides access to different vcs backends via network. # Copyright (C) 2014-2018 RhodeCode GmbH # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 3 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program; if not, write to the Free Software Foundation, # Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA import collections import logging import os import posixpath as vcspath import re import stat import traceback import urllib import urllib2 from functools import wraps from dulwich import index, objects from dulwich.client import HttpGitClient, LocalGitClient from dulwich.errors import ( NotGitRepository, ChecksumMismatch, WrongObjectException, MissingCommitError, ObjectMissing, HangupException, UnexpectedCommandError) from dulwich.repo import Repo as DulwichRepo, Tag from dulwich.server import update_server_info from vcsserver import exceptions, settings, subprocessio from vcsserver.utils import safe_str from vcsserver.base import RepoFactory, obfuscate_qs, raise_from_original from vcsserver.hgcompat import ( hg_url as url_parser, httpbasicauthhandler, httpdigestauthhandler) from vcsserver.git_lfs.lib import LFSOidStore DIR_STAT = stat.S_IFDIR FILE_MODE = stat.S_IFMT GIT_LINK = objects.S_IFGITLINK log = logging.getLogger(__name__) def reraise_safe_exceptions(func): """Converts Dulwich exceptions to something neutral.""" @wraps(func) def wrapper(*args, **kwargs): try: return func(*args, **kwargs) except (ChecksumMismatch, WrongObjectException, MissingCommitError, ObjectMissing) as e: exc = exceptions.LookupException(e) raise exc(e) except (HangupException, UnexpectedCommandError) as e: exc = exceptions.VcsException(e) raise exc(e) except Exception as e: # NOTE(marcink): becuase of how dulwich handles some exceptions # (KeyError on empty repos), we cannot track this and catch all # exceptions, it's an exceptions from other handlers #if not hasattr(e, '_vcs_kind'): #log.exception("Unhandled exception in git remote call") #raise_from_original(exceptions.UnhandledException) raise return wrapper class Repo(DulwichRepo): """ A wrapper for dulwich Repo class. Since dulwich is sometimes keeping .idx file descriptors open, it leads to "Too many open files" error. We need to close all opened file descriptors once the repo object is destroyed. TODO: mikhail: please check if we need this wrapper after updating dulwich to 0.12.0 + """ def __del__(self): if hasattr(self, 'object_store'): self.close() class GitFactory(RepoFactory): repo_type = 'git' def _create_repo(self, wire, create): repo_path = str_to_dulwich(wire['path']) return Repo(repo_path) class GitRemote(object): def __init__(self, factory): self._factory = factory self.peeled_ref_marker = '^{}' self._bulk_methods = { "author": self.commit_attribute, "date": self.get_object_attrs, "message": self.commit_attribute, "parents": self.commit_attribute, "_commit": self.revision, } def _wire_to_config(self, wire): if 'config' in wire: return dict([(x[0] + '_' + x[1], x[2]) for x in wire['config']]) return {} def _assign_ref(self, wire, ref, commit_id): repo = self._factory.repo(wire) repo[ref] = commit_id @reraise_safe_exceptions def add_object(self, wire, content): repo = self._factory.repo(wire) blob = objects.Blob() blob.set_raw_string(content) repo.object_store.add_object(blob) return blob.id @reraise_safe_exceptions def assert_correct_path(self, wire): path = wire.get('path') try: self._factory.repo(wire) except NotGitRepository as e: tb = traceback.format_exc() log.debug("Invalid Git path `%s`, tb: %s", path, tb) return False return True @reraise_safe_exceptions def bare(self, wire): repo = self._factory.repo(wire) return repo.bare @reraise_safe_exceptions def blob_as_pretty_string(self, wire, sha): repo = self._factory.repo(wire) return repo[sha].as_pretty_string() @reraise_safe_exceptions def blob_raw_length(self, wire, sha): repo = self._factory.repo(wire) blob = repo[sha] return blob.raw_length() def _parse_lfs_pointer(self, raw_content): spec_string = 'version https://git-lfs.github.com/spec' if raw_content and raw_content.startswith(spec_string): pattern = re.compile(r""" (?:\n)? ^version[ ]https://git-lfs\.github\.com/spec/(?Pv\d+)\n ^oid[ ] sha256:(?P[0-9a-f]{64})\n ^size[ ](?P[0-9]+)\n (?:\n)? """, re.VERBOSE | re.MULTILINE) match = pattern.match(raw_content) if match: return match.groupdict() return {} @reraise_safe_exceptions def is_large_file(self, wire, sha): repo = self._factory.repo(wire) blob = repo[sha] return self._parse_lfs_pointer(blob.as_raw_string()) @reraise_safe_exceptions def in_largefiles_store(self, wire, oid): repo = self._factory.repo(wire) conf = self._wire_to_config(wire) store_location = conf.get('vcs_git_lfs_store_location') if store_location: repo_name = repo.path store = LFSOidStore( oid=oid, repo=repo_name, store_location=store_location) return store.has_oid() return False @reraise_safe_exceptions def store_path(self, wire, oid): repo = self._factory.repo(wire) conf = self._wire_to_config(wire) store_location = conf.get('vcs_git_lfs_store_location') if store_location: repo_name = repo.path store = LFSOidStore( oid=oid, repo=repo_name, store_location=store_location) return store.oid_path raise ValueError('Unable to fetch oid with path {}'.format(oid)) @reraise_safe_exceptions def bulk_request(self, wire, rev, pre_load): result = {} for attr in pre_load: try: method = self._bulk_methods[attr] args = [wire, rev] if attr == "date": args.extend(["commit_time", "commit_timezone"]) elif attr in ["author", "message", "parents"]: args.append(attr) result[attr] = method(*args) except KeyError as e: raise exceptions.VcsException(e)( "Unknown bulk attribute: %s" % attr) return result def _build_opener(self, url): handlers = [] url_obj = url_parser(url) _, authinfo = url_obj.authinfo() if authinfo: # create a password manager passmgr = urllib2.HTTPPasswordMgrWithDefaultRealm() passmgr.add_password(*authinfo) handlers.extend((httpbasicauthhandler(passmgr), httpdigestauthhandler(passmgr))) return urllib2.build_opener(*handlers) @reraise_safe_exceptions def check_url(self, url, config): url_obj = url_parser(url) test_uri, _ = url_obj.authinfo() url_obj.passwd = '*****' if url_obj.passwd else url_obj.passwd url_obj.query = obfuscate_qs(url_obj.query) cleaned_uri = str(url_obj) log.info("Checking URL for remote cloning/import: %s", cleaned_uri) if not test_uri.endswith('info/refs'): test_uri = test_uri.rstrip('/') + '/info/refs' o = self._build_opener(url) o.addheaders = [('User-Agent', 'git/1.7.8.0')] # fake some git q = {"service": 'git-upload-pack'} qs = '?%s' % urllib.urlencode(q) cu = "%s%s" % (test_uri, qs) req = urllib2.Request(cu, None, {}) try: log.debug("Trying to open URL %s", cleaned_uri) resp = o.open(req) if resp.code != 200: raise exceptions.URLError()('Return Code is not 200') except Exception as e: log.warning("URL cannot be opened: %s", cleaned_uri, exc_info=True) # means it cannot be cloned raise exceptions.URLError(e)("[%s] org_exc: %s" % (cleaned_uri, e)) # now detect if it's proper git repo gitdata = resp.read() if 'service=git-upload-pack' in gitdata: pass elif re.findall(r'[0-9a-fA-F]{40}\s+refs', gitdata): # old style git can return some other format ! pass else: raise exceptions.URLError()( "url [%s] does not look like an git" % (cleaned_uri,)) return True @reraise_safe_exceptions def clone(self, wire, url, deferred, valid_refs, update_after_clone): # TODO(marcink): deprecate this method. Last i checked we don't use it anymore remote_refs = self.pull(wire, url, apply_refs=False) repo = self._factory.repo(wire) if isinstance(valid_refs, list): valid_refs = tuple(valid_refs) for k in remote_refs: # only parse heads/tags and skip so called deferred tags if k.startswith(valid_refs) and not k.endswith(deferred): repo[k] = remote_refs[k] if update_after_clone: # we want to checkout HEAD repo["HEAD"] = remote_refs["HEAD"] index.build_index_from_tree(repo.path, repo.index_path(), repo.object_store, repo["HEAD"].tree) # TODO: this is quite complex, check if that can be simplified @reraise_safe_exceptions def commit(self, wire, commit_data, branch, commit_tree, updated, removed): repo = self._factory.repo(wire) object_store = repo.object_store # Create tree and populates it with blobs commit_tree = commit_tree and repo[commit_tree] or objects.Tree() for node in updated: # Compute subdirs if needed dirpath, nodename = vcspath.split(node['path']) dirnames = map(safe_str, dirpath and dirpath.split('/') or []) parent = commit_tree ancestors = [('', parent)] # Tries to dig for the deepest existing tree while dirnames: curdir = dirnames.pop(0) try: dir_id = parent[curdir][1] except KeyError: # put curdir back into dirnames and stops dirnames.insert(0, curdir) break else: # If found, updates parent parent = repo[dir_id] ancestors.append((curdir, parent)) # Now parent is deepest existing tree and we need to create # subtrees for dirnames (in reverse order) # [this only applies for nodes from added] new_trees = [] blob = objects.Blob.from_string(node['content']) if dirnames: # If there are trees which should be created we need to build # them now (in reverse order) reversed_dirnames = list(reversed(dirnames)) curtree = objects.Tree() curtree[node['node_path']] = node['mode'], blob.id new_trees.append(curtree) for dirname in reversed_dirnames[:-1]: newtree = objects.Tree() newtree[dirname] = (DIR_STAT, curtree.id) new_trees.append(newtree) curtree = newtree parent[reversed_dirnames[-1]] = (DIR_STAT, curtree.id) else: parent.add( name=node['node_path'], mode=node['mode'], hexsha=blob.id) new_trees.append(parent) # Update ancestors reversed_ancestors = reversed( [(a[1], b[1], b[0]) for a, b in zip(ancestors, ancestors[1:])]) for parent, tree, path in reversed_ancestors: parent[path] = (DIR_STAT, tree.id) object_store.add_object(tree) object_store.add_object(blob) for tree in new_trees: object_store.add_object(tree) for node_path in removed: paths = node_path.split('/') tree = commit_tree trees = [tree] # Traverse deep into the forest... for path in paths: try: obj = repo[tree[path][1]] if isinstance(obj, objects.Tree): trees.append(obj) tree = obj except KeyError: break # Cut down the blob and all rotten trees on the way back... for path, tree in reversed(zip(paths, trees)): del tree[path] if tree: # This tree still has elements - don't remove it or any # of it's parents break object_store.add_object(commit_tree) # Create commit commit = objects.Commit() commit.tree = commit_tree.id for k, v in commit_data.iteritems(): setattr(commit, k, v) object_store.add_object(commit) ref = 'refs/heads/%s' % branch repo.refs[ref] = commit.id return commit.id @reraise_safe_exceptions def pull(self, wire, url, apply_refs=True, refs=None, update_after=False): if url != 'default' and '://' not in url: client = LocalGitClient(url) else: url_obj = url_parser(url) o = self._build_opener(url) url, _ = url_obj.authinfo() client = HttpGitClient(base_url=url, opener=o) repo = self._factory.repo(wire) determine_wants = repo.object_store.determine_wants_all if refs: def determine_wants_requested(references): return [references[r] for r in references if r in refs] determine_wants = determine_wants_requested try: remote_refs = client.fetch( path=url, target=repo, determine_wants=determine_wants) except NotGitRepository as e: log.warning( 'Trying to fetch from "%s" failed, not a Git repository.', url) # Exception can contain unicode which we convert raise exceptions.AbortException(e)(repr(e)) # mikhail: client.fetch() returns all the remote refs, but fetches only # refs filtered by `determine_wants` function. We need to filter result # as well if refs: remote_refs = {k: remote_refs[k] for k in remote_refs if k in refs} if apply_refs: # TODO: johbo: Needs proper test coverage with a git repository # that contains a tag object, so that we would end up with # a peeled ref at this point. for k in remote_refs: if k.endswith(self.peeled_ref_marker): log.debug("Skipping peeled reference %s", k) continue repo[k] = remote_refs[k] if refs and not update_after: # mikhail: explicitly set the head to the last ref. repo['HEAD'] = remote_refs[refs[-1]] if update_after: # we want to checkout HEAD repo["HEAD"] = remote_refs["HEAD"] index.build_index_from_tree(repo.path, repo.index_path(), repo.object_store, repo["HEAD"].tree) return remote_refs @reraise_safe_exceptions def sync_fetch(self, wire, url, refs=None): repo = self._factory.repo(wire) if refs and not isinstance(refs, (list, tuple)): refs = [refs] # get all remote refs we'll use to fetch later output, __ = self.run_git_command( wire, ['ls-remote', url], fail_on_stderr=False, _copts=['-c', 'core.askpass=""'], extra_env={'GIT_TERMINAL_PROMPT': '0'}) remote_refs = collections.OrderedDict() fetch_refs = [] for ref_line in output.splitlines(): sha, ref = ref_line.split('\t') sha = sha.strip() if ref in remote_refs: # duplicate, skip continue if ref.endswith(self.peeled_ref_marker): log.debug("Skipping peeled reference %s", ref) continue # don't sync HEAD if ref in ['HEAD']: continue remote_refs[ref] = sha if refs and sha in refs: # we filter fetch using our specified refs fetch_refs.append('{}:{}'.format(ref, ref)) elif not refs: fetch_refs.append('{}:{}'.format(ref, ref)) if fetch_refs: _out, _err = self.run_git_command( wire, ['fetch', url, '--force', '--prune', '--'] + fetch_refs, fail_on_stderr=False, _copts=['-c', 'core.askpass=""'], extra_env={'GIT_TERMINAL_PROMPT': '0'}) return remote_refs @reraise_safe_exceptions def sync_push(self, wire, url, refs=None): if not self.check_url(url, wire): return repo = self._factory.repo(wire) self.run_git_command( wire, ['push', url, '--mirror'], fail_on_stderr=False, _copts=['-c', 'core.askpass=""'], extra_env={'GIT_TERMINAL_PROMPT': '0'}) @reraise_safe_exceptions def get_remote_refs(self, wire, url): repo = Repo(url) return repo.get_refs() @reraise_safe_exceptions def get_description(self, wire): repo = self._factory.repo(wire) return repo.get_description() @reraise_safe_exceptions def get_missing_revs(self, wire, rev1, rev2, path2): repo = self._factory.repo(wire) LocalGitClient(thin_packs=False).fetch(path2, repo) wire_remote = wire.copy() wire_remote['path'] = path2 repo_remote = self._factory.repo(wire_remote) LocalGitClient(thin_packs=False).fetch(wire["path"], repo_remote) revs = [ x.commit.id for x in repo_remote.get_walker(include=[rev2], exclude=[rev1])] return revs @reraise_safe_exceptions def get_object(self, wire, sha): repo = self._factory.repo(wire) obj = repo.get_object(sha) commit_id = obj.id if isinstance(obj, Tag): commit_id = obj.object[1] return { 'id': obj.id, 'type': obj.type_name, 'commit_id': commit_id } @reraise_safe_exceptions def get_object_attrs(self, wire, sha, *attrs): repo = self._factory.repo(wire) obj = repo.get_object(sha) return list(getattr(obj, a) for a in attrs) @reraise_safe_exceptions def get_refs(self, wire): repo = self._factory.repo(wire) result = {} for ref, sha in repo.refs.as_dict().items(): peeled_sha = repo.get_peeled(ref) result[ref] = peeled_sha return result @reraise_safe_exceptions def get_refs_path(self, wire): repo = self._factory.repo(wire) return repo.refs.path @reraise_safe_exceptions def head(self, wire, show_exc=True): repo = self._factory.repo(wire) try: return repo.head() except Exception: if show_exc: raise @reraise_safe_exceptions def init(self, wire): repo_path = str_to_dulwich(wire['path']) self.repo = Repo.init(repo_path) @reraise_safe_exceptions def init_bare(self, wire): repo_path = str_to_dulwich(wire['path']) self.repo = Repo.init_bare(repo_path) @reraise_safe_exceptions def revision(self, wire, rev): repo = self._factory.repo(wire) obj = repo[rev] obj_data = { 'id': obj.id, } try: obj_data['tree'] = obj.tree except AttributeError: pass return obj_data @reraise_safe_exceptions def commit_attribute(self, wire, rev, attr): repo = self._factory.repo(wire) obj = repo[rev] return getattr(obj, attr) @reraise_safe_exceptions def set_refs(self, wire, key, value): repo = self._factory.repo(wire) repo.refs[key] = value @reraise_safe_exceptions def remove_ref(self, wire, key): repo = self._factory.repo(wire) del repo.refs[key] @reraise_safe_exceptions def tree_changes(self, wire, source_id, target_id): repo = self._factory.repo(wire) source = repo[source_id].tree if source_id else None target = repo[target_id].tree result = repo.object_store.tree_changes(source, target) return list(result) @reraise_safe_exceptions def tree_items(self, wire, tree_id): repo = self._factory.repo(wire) tree = repo[tree_id] result = [] for item in tree.iteritems(): item_sha = item.sha item_mode = item.mode if FILE_MODE(item_mode) == GIT_LINK: item_type = "link" else: item_type = repo[item_sha].type_name result.append((item.path, item_mode, item_sha, item_type)) return result @reraise_safe_exceptions def update_server_info(self, wire): repo = self._factory.repo(wire) update_server_info(repo) @reraise_safe_exceptions def discover_git_version(self): stdout, _ = self.run_git_command( {}, ['--version'], _bare=True, _safe=True) prefix = 'git version' if stdout.startswith(prefix): stdout = stdout[len(prefix):] return stdout.strip() @reraise_safe_exceptions def run_git_command(self, wire, cmd, **opts): path = wire.get('path', None) if path and os.path.isdir(path): opts['cwd'] = path if '_bare' in opts: _copts = [] del opts['_bare'] else: _copts = ['-c', 'core.quotepath=false', ] safe_call = False if '_safe' in opts: # no exc on failure del opts['_safe'] safe_call = True if '_copts' in opts: _copts.extend(opts['_copts'] or []) del opts['_copts'] gitenv = os.environ.copy() gitenv.update(opts.pop('extra_env', {})) # need to clean fix GIT_DIR ! if 'GIT_DIR' in gitenv: del gitenv['GIT_DIR'] gitenv['GIT_CONFIG_NOGLOBAL'] = '1' gitenv['GIT_DISCOVERY_ACROSS_FILESYSTEM'] = '1' cmd = [settings.GIT_EXECUTABLE] + _copts + cmd _opts = {'env': gitenv, 'shell': False} try: _opts.update(opts) p = subprocessio.SubprocessIOChunker(cmd, **_opts) return ''.join(p), ''.join(p.error) except (EnvironmentError, OSError) as err: cmd = ' '.join(cmd) # human friendly CMD tb_err = ("Couldn't run git command (%s).\n" "Original error was:%s\n" "Call options:%s\n" % (cmd, err, _opts)) log.exception(tb_err) if safe_call: return '', err else: raise exceptions.VcsException()(tb_err) @reraise_safe_exceptions def install_hooks(self, wire, force=False): from vcsserver.hook_utils import install_git_hooks repo = self._factory.repo(wire) return install_git_hooks(repo.path, repo.bare, force_create=force) def str_to_dulwich(value): """ Dulwich 0.10.1a requires `unicode` objects to be passed in. """ return value.decode(settings.WIRE_ENCODING)