Mercurial > hg
view hgext/lfs/pointer.py @ 49680:40e24d82b513
delta-find: make sure we only use newer full snapshot as candidate
The current code does not needs to protect against this, as there are no older
snapshot in the current cache. However as we are getting ready to reuse this
cache from one revision to another, we need the code to protect itself about
what's coming.
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
---|---|
date | Sun, 06 Nov 2022 17:55:55 -0500 |
parents | 1672c5af1271 |
children | f4733654f144 |
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# pointer.py - Git-LFS pointer serialization # # Copyright 2017 Facebook, Inc. # # This software may be used and distributed according to the terms of the # GNU General Public License version 2 or any later version. import re from mercurial.i18n import _ from mercurial import ( error, pycompat, ) from mercurial.utils import stringutil class InvalidPointer(error.StorageError): pass class gitlfspointer(dict): VERSION = b'https://git-lfs.github.com/spec/v1' def __init__(self, *args, **kwargs): self[b'version'] = self.VERSION super(gitlfspointer, self).__init__(*args) self.update(pycompat.byteskwargs(kwargs)) @classmethod def deserialize(cls, text): try: return cls(l.split(b' ', 1) for l in text.splitlines()).validate() except ValueError: # l.split returns 1 item instead of 2 raise InvalidPointer( _(b'cannot parse git-lfs text: %s') % stringutil.pprint(text) ) def serialize(self): sortkeyfunc = lambda x: (x[0] != b'version', x) items = sorted(self.validate().items(), key=sortkeyfunc) return b''.join(b'%s %s\n' % (k, v) for k, v in items) def oid(self): return self[b'oid'].split(b':')[-1] def size(self): return int(self[b'size']) # regular expressions used by _validate # see https://github.com/git-lfs/git-lfs/blob/master/docs/spec.md _keyre = re.compile(br'\A[a-z0-9.-]+\Z') _valuere = re.compile(br'\A[^\n]*\Z') _requiredre = { b'size': re.compile(br'\A[0-9]+\Z'), b'oid': re.compile(br'\Asha256:[0-9a-f]{64}\Z'), b'version': re.compile(br'\A%s\Z' % stringutil.reescape(VERSION)), } def validate(self): """raise InvalidPointer on error. return self if there is no error""" requiredcount = 0 for k, v in self.items(): if k in self._requiredre: if not self._requiredre[k].match(v): raise InvalidPointer( _(b'unexpected lfs pointer value: %s=%s') % (k, stringutil.pprint(v)) ) requiredcount += 1 elif not self._keyre.match(k): raise InvalidPointer(_(b'unexpected lfs pointer key: %s') % k) if not self._valuere.match(v): raise InvalidPointer( _(b'unexpected lfs pointer value: %s=%s') % (k, stringutil.pprint(v)) ) if len(self._requiredre) != requiredcount: miss = sorted(set(self._requiredre.keys()).difference(self.keys())) raise InvalidPointer( _(b'missing lfs pointer keys: %s') % b', '.join(miss) ) return self deserialize = gitlfspointer.deserialize