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# pointer.py - Git-LFS pointer serialization
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#
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# Copyright 2017 Facebook, Inc.
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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from __future__ import absolute_import
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import re
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from mercurial.i18n import _
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from mercurial import (
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error,
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pycompat,
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)
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from mercurial.utils import (
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stringutil,
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)
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class InvalidPointer(error.RevlogError):
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pass
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class gitlfspointer(dict):
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VERSION = 'https://git-lfs.github.com/spec/v1'
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def __init__(self, *args, **kwargs):
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self['version'] = self.VERSION
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super(gitlfspointer, self).__init__(*args)
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self.update(pycompat.byteskwargs(kwargs))
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@classmethod
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def deserialize(cls, text):
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try:
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return cls(l.split(' ', 1) for l in text.splitlines()).validate()
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except ValueError: # l.split returns 1 item instead of 2
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raise InvalidPointer(_('cannot parse git-lfs text: %s')
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% stringutil.pprint(text))
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def serialize(self):
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sortkeyfunc = lambda x: (x[0] != 'version', x)
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items = sorted(self.validate().iteritems(), key=sortkeyfunc)
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return ''.join('%s %s\n' % (k, v) for k, v in items)
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def oid(self):
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return self['oid'].split(':')[-1]
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def size(self):
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return int(self['size'])
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# regular expressions used by _validate
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# see https://github.com/git-lfs/git-lfs/blob/master/docs/spec.md
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_keyre = re.compile(br'\A[a-z0-9.-]+\Z')
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_valuere = re.compile(br'\A[^\n]*\Z')
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_requiredre = {
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'size': re.compile(br'\A[0-9]+\Z'),
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'oid': re.compile(br'\Asha256:[0-9a-f]{64}\Z'),
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'version': re.compile(br'\A%s\Z' % re.escape(VERSION)),
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}
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def validate(self):
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"""raise InvalidPointer on error. return self if there is no error"""
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requiredcount = 0
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for k, v in self.iteritems():
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if k in self._requiredre:
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if not self._requiredre[k].match(v):
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raise InvalidPointer(
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_('unexpected lfs pointer value: %s=%s')
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% (k, stringutil.pprint(v)))
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requiredcount += 1
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elif not self._keyre.match(k):
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raise InvalidPointer(_('unexpected lfs pointer key: %s') % k)
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if not self._valuere.match(v):
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raise InvalidPointer(_('unexpected lfs pointer value: %s=%s')
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% (k, stringutil.pprint(v)))
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if len(self._requiredre) != requiredcount:
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miss = sorted(set(self._requiredre.keys()).difference(self.keys()))
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raise InvalidPointer(_('missing lfs pointer keys: %s')
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% ', '.join(miss))
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return self
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deserialize = gitlfspointer.deserialize
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