# Copyright (C) 2009 Jelmer Vernooij # # 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 2 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA """Map from Git sha's to Bazaar objects.""" import os import bzrlib from bzrlib.errors import ( NoSuchRevision, ) def check_pysqlite_version(sqlite3): """Check that sqlite library is compatible. """ if (sqlite3.sqlite_version_info[0] < 3 or (sqlite3.sqlite_version_info[0] == 3 and sqlite3.sqlite_version_info[1] < 3)): warning('Needs at least sqlite 3.3.x') raise bzrlib.errors.BzrError("incompatible sqlite library") try: try: import sqlite3 check_pysqlite_version(sqlite3) except (ImportError, bzrlib.errors.BzrError), e: from pysqlite2 import dbapi2 as sqlite3 check_pysqlite_version(sqlite3) except: warning('Needs at least Python2.5 or Python2.4 with the pysqlite2 ' 'module') raise bzrlib.errors.BzrError("missing sqlite library") class GitShaMap(object): """Git<->Bzr revision id mapping database.""" def add_entry(self, sha, type, type_data): """Add a new entry to the database. """ raise NotImplementedError(self.add_entry) def lookup_tree(self, path, revid): """Lookup the SHA of a git tree.""" raise NotImplementedError(self.lookup_tree) def lookup_blob(self, fileid, revid): raise NotImplementedError(self.lookup_blob) def lookup_git_sha(self, sha): """Lookup a Git sha in the database. :param sha: Git object sha :return: (type, type_data) with type_data: revision: revid, tree sha """ raise NotImplementedError(self.lookup_git_sha) def revids(self): """List the revision ids known.""" raise NotImplementedError(self.revids) def commit(self): """Commit any pending changes.""" class DictGitShaMap(GitShaMap): def __init__(self): self.dict = {} def add_entry(self, sha, type, type_data): self.dict[sha] = (type, type_data) def lookup_git_sha(self, sha): return self.dict[sha] def lookup_tree(self, path, revid): for k, v in self.dict.iteritems(): if v == ("tree", (path, revid)): return k raise KeyError((path, revid)) def lookup_blob(self, fileid, revid): for k, v in self.dict.iteritems(): if v == ("blob", (fileid, revid)): return k raise KeyError((fileid, revid)) def revids(self): for key, (type, type_data) in self.dict.iteritems(): if type == "commit": yield type_data[0] class SqliteGitShaMap(GitShaMap): def __init__(self, transport=None): self.transport = transport if transport is None: self.db = sqlite3.connect(":memory:") else: self.db = sqlite3.connect( os.path.join(self.transport.local_abspath("."), "git.db")) self.db.executescript(""" create table if not exists commits(sha1 text, revid text, tree_sha text); create index if not exists commit_sha1 on commits(sha1); create unique index if not exists commit_revid on commits(revid); create table if not exists blobs(sha1 text, fileid text, revid text); create index if not exists blobs_sha1 on blobs(sha1); create unique index if not exists blobs_fileid_revid on blobs(fileid, revid); create table if not exists trees(sha1 text, path text, revid text); create index if not exists trees_sha1 on trees(sha1); create unique index if not exists trees_path_revid on trees(path, revid); """) def _parent_lookup(self, revid): return self.db.execute("select sha1 from commits where revid = ?", (revid,)).fetchone()[0].encode("utf-8") def commit(self): self.db.commit() def add_entry(self, sha, type, type_data): """Add a new entry to the database. """ assert isinstance(type_data, tuple) assert isinstance(sha, str), "type was %r" % sha if type == "commit": self.db.execute("replace into commits (sha1, revid, tree_sha) values (?, ?, ?)", (sha, type_data[0], type_data[1])) elif type == "blob": self.db.execute("replace into blobs (sha1, fileid, revid) values (?, ?, ?)", (sha, type_data[0], type_data[1])) elif type == "tree": self.db.execute("replace into trees (sha1, path, revid) values (?, ?, ?)", (sha, type_data[0], type_data[1])) else: raise AssertionError("Unknown type %s" % type) def lookup_tree(self, path, revid): row = self.db.execute("select sha1 from trees where path = ? and revid = ?", (path,revid)).fetchone() if row is None: raise KeyError((path, revid)) return row[0] def lookup_blob(self, fileid, revid): row = self.db.execute("select sha1 from blobs where fileid = ? and revid = ?", (fileid, revid)).fetchone() if row is None: raise KeyError((fileid, revid)) return row[0] def lookup_git_sha(self, sha): """Lookup a Git sha in the database. :param sha: Git object sha :return: (type, type_data) with type_data: revision: revid, tree sha """ row = self.db.execute("select revid, tree_sha from commits where sha1 = ?", (sha,)).fetchone() if row is not None: return ("commit", row) row = self.db.execute("select fileid, revid from blobs where sha1 = ?", (sha,)).fetchone() if row is not None: return ("blob", row) row = self.db.execute("select path, revid from trees where sha1 = ?", (sha,)).fetchone() if row is not None: return ("tree", row) raise KeyError(sha) def revids(self): """List the revision ids known.""" for row in self.db.execute("select revid from commits").fetchall(): yield row[0]