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from symbolic import SymbolicReference
import os
from git.objects import Object
from git.util import (
LazyMixin,
Iterable,
)
from gitdb.util import (
isfile,
hex_to_bin
)
__all__ = ["Reference"]
class Reference(SymbolicReference, LazyMixin, Iterable):
"""Represents a named reference to any object. Subclasses may apply restrictions though,
i.e. Heads can only point to commits."""
__slots__ = tuple()
_points_to_commits_only = False
_resolve_ref_on_create = True
_common_path_default = "refs"
def __init__(self, repo, path, check_path = True):
"""Initialize this instance
:param repo: Our parent repository
:param path:
Path relative to the .git/ directory pointing to the ref in question, i.e.
refs/heads/master
:param check_path: if False, you can provide any path. Otherwise the path must start with the
default path prefix of this type."""
if check_path and not path.startswith(self._common_path_default+'/'):
raise ValueError("Cannot instantiate %r from path %s" % (self.__class__.__name__, path))
super(Reference, self).__init__(repo, path)
def __str__(self):
return self.name
def set_object(self, object, logmsg = None):
"""Special version which checks if the head-log needs an update as well"""
oldbinsha = None
if logmsg is not None:
head = self.repo.head
if not head.is_detached and head.ref == self:
oldbinsha = self.commit.binsha
#END handle commit retrieval
#END handle message is set
super(Reference, self).set_object(object, logmsg)
if oldbinsha is not None:
# /* from refs.c in git-source
# * Special hack: If a branch is updated directly and HEAD
# * points to it (may happen on the remote side of a push
# * for example) then logically the HEAD reflog should be
# * updated too.
# * A generic solution implies reverse symref information,
# * but finding all symrefs pointing to the given branch
# * would be rather costly for this rare event (the direct
# * update of a branch) to be worth it. So let's cheat and
# * check with HEAD only which should cover 99% of all usage
# * scenarios (even 100% of the default ones).
# */
self.repo.head.log_append(oldbinsha, logmsg)
#END check if the head
# NOTE: Don't have to overwrite properties as the will only work without a the log
@property
def name(self):
""":return: (shortest) Name of this reference - it may contain path components"""
# first two path tokens are can be removed as they are
# refs/heads or refs/tags or refs/remotes
tokens = self.path.split('/')
if len(tokens) < 3:
return self.path # could be refs/HEAD
return '/'.join(tokens[2:])
@classmethod
def iter_items(cls, repo, common_path = None):
"""Equivalent to SymbolicReference.iter_items, but will return non-detached
references as well."""
return cls._iter_items(repo, common_path)
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