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83 lines
2.6 KiB
83 lines
2.6 KiB
6 years ago
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# Copyright (C) 2010, 2011 Sebastian Thiel (byronimo@gmail.com) and contributors
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#
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# This module is part of GitDB and is released under
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# the New BSD License: http://www.opensource.org/licenses/bsd-license.php
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import codecs
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from gitdb.db.base import (
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CompoundDB,
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)
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__all__ = ('ReferenceDB', )
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class ReferenceDB(CompoundDB):
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"""A database consisting of database referred to in a file"""
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# Configuration
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# Specifies the object database to use for the paths found in the alternates
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# file. If None, it defaults to the GitDB
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ObjectDBCls = None
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def __init__(self, ref_file):
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super(ReferenceDB, self).__init__()
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self._ref_file = ref_file
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def _set_cache_(self, attr):
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if attr == '_dbs':
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self._dbs = list()
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self._update_dbs_from_ref_file()
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else:
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super(ReferenceDB, self)._set_cache_(attr)
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# END handle attrs
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def _update_dbs_from_ref_file(self):
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dbcls = self.ObjectDBCls
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if dbcls is None:
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# late import
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from gitdb.db.git import GitDB
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dbcls = GitDB
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# END get db type
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# try to get as many as possible, don't fail if some are unavailable
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ref_paths = list()
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try:
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with codecs.open(self._ref_file, 'r', encoding="utf-8") as f:
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ref_paths = [l.strip() for l in f]
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except (OSError, IOError):
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pass
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# END handle alternates
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ref_paths_set = set(ref_paths)
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cur_ref_paths_set = set(db.root_path() for db in self._dbs)
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# remove existing
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for path in (cur_ref_paths_set - ref_paths_set):
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for i, db in enumerate(self._dbs[:]):
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if db.root_path() == path:
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del(self._dbs[i])
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continue
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# END del matching db
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# END for each path to remove
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# add new
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# sort them to maintain order
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added_paths = sorted(ref_paths_set - cur_ref_paths_set, key=lambda p: ref_paths.index(p))
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for path in added_paths:
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try:
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db = dbcls(path)
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# force an update to verify path
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if isinstance(db, CompoundDB):
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db.databases()
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# END verification
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self._dbs.append(db)
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except Exception:
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# ignore invalid paths or issues
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pass
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# END for each path to add
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def update_cache(self, force=False):
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# re-read alternates and update databases
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self._update_dbs_from_ref_file()
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return super(ReferenceDB, self).update_cache(force)
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