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"""Module with additional types used by the index"""
from util import (
pack,
unpack
)
from binascii import (
b2a_hex,
)
from git.objects import Blob
__all__ = ('BlobFilter', 'BaseIndexEntry', 'IndexEntry')
#{ Invariants
CE_NAMEMASK = 0x0fff
CE_STAGEMASK = 0x3000
CE_EXTENDED = 0x4000
CE_VALID = 0x8000
CE_STAGESHIFT = 12
#} END invariants
class BlobFilter(object):
"""
Predicate to be used by iter_blobs allowing to filter only return blobs which
match the given list of directories or files.
The given paths are given relative to the repository.
"""
__slots__ = 'paths'
def __init__(self, paths):
""":param paths:
tuple or list of paths which are either pointing to directories or
to files relative to the current repository
"""
self.paths = paths
def __call__(self, stage_blob):
path = stage_blob[1].path
for p in self.paths:
if path.startswith(p):
return True
# END for each path in filter paths
return False
class BaseIndexEntry(tuple):
"""Small Brother of an index entry which can be created to describe changes
done to the index in which case plenty of additional information is not requried.
As the first 4 data members match exactly to the IndexEntry type, methods
expecting a BaseIndexEntry can also handle full IndexEntries even if they
use numeric indices for performance reasons. """
def __str__(self):
return "%o %s %i\t%s" % (self.mode, self.hexsha, self.stage, self.path)
def __repr__(self):
return "(%o, %s, %i, %s)" % (self.mode, self.hexsha, self.stage, self.path)
@property
def mode(self):
""" File Mode, compatible to stat module constants """
return self[0]
@property
def binsha(self):
"""binary sha of the blob """
return self[1]
@property
def hexsha(self):
"""hex version of our sha"""
return b2a_hex(self[1])
@property
def stage(self):
"""Stage of the entry, either:
* 0 = default stage
* 1 = stage before a merge or common ancestor entry in case of a 3 way merge
* 2 = stage of entries from the 'left' side of the merge
* 3 = stage of entries from the right side of the merge
:note: For more information, see http://www.kernel.org/pub/software/scm/git/docs/git-read-tree.html
"""
return (self[2] & CE_STAGEMASK) >> CE_STAGESHIFT
@property
def path(self):
""":return: our path relative to the repository working tree root"""
return self[3]
@property
def flags(self):
""":return: flags stored with this entry"""
return self[2]
@classmethod
def from_blob(cls, blob, stage = 0):
""":return: Fully equipped BaseIndexEntry at the given stage"""
return cls((blob.mode, blob.binsha, stage << CE_STAGESHIFT, blob.path))
def to_blob(self, repo):
""":return: Blob using the information of this index entry"""
return Blob(repo, self.binsha, self.mode, self.path)
class IndexEntry(BaseIndexEntry):
"""Allows convenient access to IndexEntry data without completely unpacking it.
Attributes usully accessed often are cached in the tuple whereas others are
unpacked on demand.
See the properties for a mapping between names and tuple indices. """
@property
def ctime(self):
"""
:return:
Tuple(int_time_seconds_since_epoch, int_nano_seconds) of the
file's creation time"""
return unpack(">LL", self[4])
@property
def mtime(self):
"""See ctime property, but returns modification time """
return unpack(">LL", self[5])
@property
def dev(self):
""" Device ID """
return self[6]
@property
def inode(self):
""" Inode ID """
return self[7]
@property
def uid(self):
""" User ID """
return self[8]
@property
def gid(self):
""" Group ID """
return self[9]
@property
def size(self):
""":return: Uncompressed size of the blob """
return self[10]
@classmethod
def from_base(cls, base):
"""
:return:
Minimal entry as created from the given BaseIndexEntry instance.
Missing values will be set to null-like values
:param base: Instance of type BaseIndexEntry"""
time = pack(">LL", 0, 0)
return IndexEntry((base.mode, base.binsha, base.flags, base.path, time, time, 0, 0, 0, 0, 0))
@classmethod
def from_blob(cls, blob, stage = 0):
""":return: Minimal entry resembling the given blob object"""
time = pack(">LL", 0, 0)
return IndexEntry((blob.mode, blob.binsha, stage << CE_STAGESHIFT, blob.path, time, time, 0, 0, 0, 0, blob.size))
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