Mercurial > hg
view mercurial/utils/storageutil.py @ 39879:d269ddbf54f0
storageutil: move _censoredtext() from revlog
This seems like generic functionality we'll want to use from
non-revlog storage backends.
Differential Revision: https://phab.mercurial-scm.org/D4755
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Mon, 24 Sep 2018 14:33:45 -0700 |
parents | 3e896b51aa5d |
children | 1b65fb4d43d6 |
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# storageutil.py - Storage functionality agnostic of backend implementation. # # Copyright 2018 Gregory Szorc <gregory.szorc@gmail.com> # # This software may be used and distributed according to the terms of the # GNU General Public License version 2 or any later version. from __future__ import absolute_import import hashlib import re from ..node import ( nullid, ) _nullhash = hashlib.sha1(nullid) def hashrevisionsha1(text, p1, p2): """Compute the SHA-1 for revision data and its parents. This hash combines both the current file contents and its history in a manner that makes it easy to distinguish nodes with the same content in the revision graph. """ # As of now, if one of the parent node is null, p2 is null if p2 == nullid: # deep copy of a hash is faster than creating one s = _nullhash.copy() s.update(p1) else: # none of the parent nodes are nullid if p1 < p2: a = p1 b = p2 else: a = p2 b = p1 s = hashlib.sha1(a) s.update(b) s.update(text) return s.digest() METADATA_RE = re.compile(b'\x01\n') def parsemeta(text): """Parse metadata header from revision data. Returns a 2-tuple of (metadata, offset), where both can be None if there is no metadata. """ # text can be buffer, so we can't use .startswith or .index if text[:2] != b'\x01\n': return None, None s = METADATA_RE.search(text, 2).start() mtext = text[2:s] meta = {} for l in mtext.splitlines(): k, v = l.split(b': ', 1) meta[k] = v return meta, s + 2 def packmeta(meta, text): """Add metadata to fulltext to produce revision text.""" keys = sorted(meta) metatext = b''.join(b'%s: %s\n' % (k, meta[k]) for k in keys) return b'\x01\n%s\x01\n%s' % (metatext, text) def iscensoredtext(text): meta = parsemeta(text)[0] return meta and b'censored' in meta