comparison mercurial/manifest.py @ 24528:b538ae24aa97

manifestv2: implement slow readdelta() without revdiff

For manifest v2, revlog.revdiff() usually does not provide enough
information to produce a manifest. As a simple workaround, implement
readdelta() by reading both the old and the new manifest and use
manifest.diff() to find the difference. This is several times slower
than the current readdelta() for v1 manifests, but there seems to be
no other simple option, and this is still much faster than returning
the full manifest (at least for verify).

24527:8aead3bc5ff8

    def _newmanifest(self, data=''):
        if self._usetreemanifest:
            return treemanifest('', data)
        return manifestdict(data)

    def readdelta(self, node):
        r = self.rev(node)
        d = mdiff.patchtext(self.revdiff(self.deltaparent(r), r))
        return self._newmanifest(d)

    def readfast(self, node):

24528:b538ae24aa97

    def _newmanifest(self, data=''):
        if self._usetreemanifest:
            return treemanifest('', data)
        return manifestdict(data)

    def _slowreaddelta(self, node):
        r0 = self.deltaparent(self.rev(node))
        m0 = self.read(self.node(r0))
        m1 = self.read(node)
        md = self._newmanifest()
        for f, ((n0, fl0), (n1, fl1)) in m0.diff(m1).iteritems():
            if n1:
                md[f] = n1
                if fl1:
                    md.setflag(f, fl1)
        return md

    def readdelta(self, node):
        if self._usemanifestv2:
            return self._slowreaddelta(node)
        r = self.rev(node)
        d = mdiff.patchtext(self.revdiff(self.deltaparent(r), r))
        return self._newmanifest(d)

    def readfast(self, node):