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# This module is part of GitDB and is released under

# the New BSD License: https://opensource.org/license/bsd-3-clause/

from gitdb.db.base import (

CompoundDB,

)

__all__ = ('ReferenceDB', )

class ReferenceDB(CompoundDB):

"""A database consisting of database referred to in a file"""

# Configuration

# Specifies the object database to use for the paths found in the alternates

# file. If None, it defaults to the GitDB

ObjectDBCls = None

def __init__(self, ref_file):

super().__init__()

self._ref_file = ref_file

def _set_cache_(self, attr):

if attr == '_dbs':

self._dbs = list()

self._update_dbs_from_ref_file()

else:

super()._set_cache_(attr)

# END handle attrs

def _update_dbs_from_ref_file(self):

dbcls = self.ObjectDBCls

if dbcls is None:

# late import

from gitdb.db.git import GitDB

dbcls = GitDB

# END get db type

# try to get as many as possible, don't fail if some are unavailable

ref_paths = list()

try:

with open(self._ref_file, 'r', encoding="utf-8") as f:

ref_paths = [l.strip() for l in f]

except OSError:

pass

# END handle alternates

ref_paths_set = set(ref_paths)

cur_ref_paths_set = {db.root_path() for db in self._dbs}

# remove existing

for path in (cur_ref_paths_set - ref_paths_set):

for i, db in enumerate(self._dbs[:]):

if db.root_path() == path:

del(self._dbs[i])

continue

# END del matching db

# END for each path to remove

# add new

# sort them to maintain order

added_paths = sorted(ref_paths_set - cur_ref_paths_set, key=lambda p: ref_paths.index(p))

for path in added_paths:

try:

db = dbcls(path)

# force an update to verify path

if isinstance(db, CompoundDB):

db.databases()

# END verification

self._dbs.append(db)

except Exception:

# ignore invalid paths or issues

pass

# END for each path to add

def update_cache(self, force=False):

# re-read alternates and update databases

self._update_dbs_from_ref_file()

return super().update_cache(force)

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