diff --git a/swh/storage/vault/cookers/revision_git.py b/swh/storage/vault/cookers/revision_git.py index df39f03..3e244d4 100644 --- a/swh/storage/vault/cookers/revision_git.py +++ b/swh/storage/vault/cookers/revision_git.py @@ -1,162 +1,165 @@ # Copyright (C) 2017 The Software Heritage developers # See the AUTHORS file at the top-level directory of this distribution # License: GNU General Public License version 3, or any later version # See top-level LICENSE file for more information +import logging +import os import collections import fastimport.commands from .base import BaseVaultCooker class RevisionGitCooker(BaseVaultCooker): """Cooker to create a git fast-import bundle """ CACHE_TYPE_KEY = 'revision_git' def prepare_bundle(self): commands = self.fastexport(self.storage.revision_log([self.obj_id])) bundle_content = b'\n'.join(bytes(command) for command in commands) return bundle_content def fastexport(self, log): """Generate all the git fast-import commands from a given log. """ self.rev_by_id = {r['id']: r for r in log} self.rev_sorted = list(self._toposort(self.rev_by_id)) self.dir_by_id = {} self.obj_done = set() self.obj_to_mark = {} self.next_available_mark = 1 - yield from self._compute_all_blob_commands() - yield from self._compute_all_commit_commands() + for i, rev in enumerate(self.rev_sorted, 1): + logging.info('Computing revision %d/%d', i, len(self.rev_sorted)) + yield from self._compute_commit_command(rev) def _toposort(self, rev_by_id): """Perform a topological sort on the revision graph. """ children = collections.defaultdict(list) in_degree = collections.defaultdict(int) for rev_id, rev in rev_by_id.items(): for parent in rev['parents']: in_degree[rev_id] += 1 children[parent].append(rev_id) queue = collections.deque() for rev_id in rev_by_id.keys(): if in_degree[rev_id] == 0: queue.append(rev_id) while queue: rev_id = queue.popleft() yield rev_by_id[rev_id] for child in children[rev_id]: in_degree[child] -= 1 if in_degree[child] == 0: queue.append(child) def mark(self, obj_id): """Get the mark ID as bytes of a git object. If the object has not yet been marked, assign a new ID and add it to the mark dictionary. """ if obj_id not in self.obj_to_mark: self.obj_to_mark[obj_id] = self.next_available_mark self.next_available_mark += 1 return str(self.obj_to_mark[obj_id]).encode() - def _compute_all_blob_commands(self): - """Compute all the blob commands to populate the empty git repository. - - Mark the populated blobs so that we are able to reference them in file - commands. - - """ - for rev in self.rev_sorted: - yield from self._compute_blob_commands_in_dir(rev['directory']) - - def _compute_blob_commands_in_dir(self, dir_id): - """Find all the blobs in a directory and generate their blob commands. - - If a blob has already been visited and marked, skip it. - """ - data = self.storage.directory_ls(dir_id, recursive=True) - files_data = list(entry for entry in data if entry['type'] == 'file') - self.dir_by_id[dir_id] = files_data - for file_data in files_data: - obj_id = file_data['sha1'] - if obj_id in self.obj_done: - continue - content = list(self.storage.content_get([obj_id]))[0]['data'] - yield fastimport.commands.BlobCommand( - mark=self.mark(obj_id), - data=content, - ) - self.obj_done.add(obj_id) - - def _compute_all_commit_commands(self): - """Compute all the commit commands. + def _compute_blob_command_content(self, file_data): + """Compute the blob command of a file entry if it has not been + computed yet. """ - for rev in self.rev_sorted: - yield from self._compute_commit_command(rev) + obj_id = file_data['sha1'] + if obj_id in self.obj_done: + return + content = list(self.storage.content_get([obj_id]))[0]['data'] + yield fastimport.commands.BlobCommand( + mark=self.mark(obj_id), + data=content, + ) + self.obj_done.add(obj_id) def _compute_commit_command(self, rev): """Compute a commit command from a specific revision. """ from_ = None merges = None parent = None if 'parents' in rev and rev['parents']: from_ = b':' + self.mark(rev['parents'][0]) merges = [b':' + self.mark(r) for r in rev['parents'][1:]] parent = self.rev_by_id[rev['parents'][0]] - files = self._compute_file_commands(rev, parent) + files = yield from self._compute_file_commands(rev, parent) author = (rev['author']['name'], rev['author']['email'], rev['date']['timestamp']['seconds'], rev['date']['offset'] * 60) committer = (rev['committer']['name'], rev['committer']['email'], rev['committer_date']['timestamp']['seconds'], rev['committer_date']['offset'] * 60) yield fastimport.commands.CommitCommand( ref=b'refs/heads/master', mark=self.mark(rev['id']), author=author, committer=committer, message=rev['message'], from_=from_, merges=merges, file_iter=files, ) + def _get_dir_ents(self, dir_id=None): + data = (self.storage.directory_ls(dir_id) + if dir_id is not None else []) + return {f['name']: f for f in data} + def _compute_file_commands(self, rev, parent=None): """Compute all the file commands of a revision. Generate a diff of the files between the revision and its main parent to find the necessary file commands to apply. """ - if not parent: - parent_dir = [] - else: - parent_dir = self.dir_by_id[parent['directory']] - cur_dir = self.dir_by_id[rev['directory']] - parent_dir = {f['name']: f for f in parent_dir} - cur_dir = {f['name']: f for f in cur_dir} - - for fname, f in cur_dir.items(): - if ((fname not in parent_dir - or f['sha1'] != parent_dir[fname]['sha1'] - or f['perms'] != parent_dir[fname]['perms'])): - yield fastimport.commands.FileModifyCommand( - path=f['name'], - mode=f['perms'], - dataref=(b':' + self.mark(f['sha1'])), - data=None, - ) - - for fname, f in parent_dir.items(): - if fname not in cur_dir: - yield fastimport.commands.FileDeleteCommand( - path=f['name'] - ) + commands = [] + + cur_dir = rev['directory'] + parent_dir = parent['directory'] if parent else None + + queue = collections.deque() # base path, rev dir id, parent dir id + queue.append((b'', cur_dir, parent_dir)) + + while queue: + root, cur_dir_id, prev_dir_id = queue.pop() + cur_dir = self._get_dir_ents(cur_dir_id) + prev_dir = self._get_dir_ents(prev_dir_id) + + for fname, f in prev_dir.items(): + if ((fname not in cur_dir + or f['type'] != cur_dir[fname]['type'])): + commands.append(fastimport.commands.FileDeleteCommand( + path=os.path.join(root, fname) + )) + + for fname, f in cur_dir.items(): + if (f['type'] == 'file' + and (fname not in prev_dir + or f['sha1'] != prev_dir[fname]['sha1'] + or f['perms'] != prev_dir[fname]['perms'])): + yield from self._compute_blob_command_content(f) + commands.append(fastimport.commands.FileModifyCommand( + path=os.path.join(root, fname), + mode=f['perms'], + dataref=(b':' + self.mark(f['sha1'])), + data=None, + )) + elif f['type'] == 'dir': + f_prev_target = None + if fname in prev_dir and prev_dir[fname]['type'] == 'dir': + f_prev_target = prev_dir[fname]['target'] + queue.append((os.path.join(root, fname), + f['target'], f_prev_target)) + + return commands