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comparison mercurial/revlog.py @ 40325:b0fbd1792e2d

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storageutil: extract most of peek_censored from revlog This function is super hacky and isn't correct 100% of the time. I'm going to need this functionality on a future non-revlog store. Let's copy things to storageutil so this code only exists once. Differential Revision: https://phab.mercurial-scm.org/D5118
author Gregory Szorc <gregory.szorc@gmail.com>
date Tue, 16 Oct 2018 15:36:19 +0200
parents 9cadb0f5f227
children 59a870a4ad6e 256b1f0c24e8
comparison
equal deleted inserted replaced
40324:6637b079ae45 40325:b0fbd1792e2d
2107 def _peek_iscensored(self, baserev, delta, flush): 2107 def _peek_iscensored(self, baserev, delta, flush):
2108 """Quickly check if a delta produces a censored revision.""" 2108 """Quickly check if a delta produces a censored revision."""
2109 if not self._censorable: 2109 if not self._censorable:
2110 return False 2110 return False
2111 2111
2112 # Fragile heuristic: unless new file meta keys are added alphabetically 2112 return storageutil.deltaiscensored(delta, baserev, self.rawsize)
2113 # preceding "censored", all censored revisions are prefixed by
2114 # "\1\ncensored:". A delta producing such a censored revision must be a
2115 # full-replacement delta, so we inspect the first and only patch in the
2116 # delta for this prefix.
2117 hlen = struct.calcsize(">lll")
2118 if len(delta) <= hlen:
2119 return False
2120
2121 oldlen = self.rawsize(baserev)
2122 newlen = len(delta) - hlen
2123 if delta[:hlen] != mdiff.replacediffheader(oldlen, newlen):
2124 return False
2125
2126 add = "\1\ncensored:"
2127 addlen = len(add)
2128 return newlen >= addlen and delta[hlen:hlen + addlen] == add
2129 2113
2130 def getstrippoint(self, minlink): 2114 def getstrippoint(self, minlink):
2131 """find the minimum rev that must be stripped to strip the linkrev 2115 """find the minimum rev that must be stripped to strip the linkrev
2132 2116
2133 Returns a tuple containing the minimum rev and a set of all revs that 2117 Returns a tuple containing the minimum rev and a set of all revs that