comparison mercurial/localrepo.py @ 23009:90f86ad3d4ff

bundle2: change header size and make them signed (new format)

We are changing all integers that denote the size of a chunk to read to int32.
There are two main motivations for that.

First, we change everything to the same width (32 bits) to make it possible for
a reasonably agnostic actor to forward a bundle2 without any extra processing.
With this change, this could be achieved by just reading int32s and forwarding
chunks of the size read. A bit a smartness would be logic to detect the end of
stream but nothing too complicated.

Second, we need some capacity to transmit special information during the bundle
processing. For example we would like to be able to raise an exception while a
part is being read if this exception happend while this part was generated.
Having signed integer let us use negative numbers to trigger special events
during the parsing of the bundle.

The format is renamed for B2X to B2Y because this breaks binary
compatibility. The B2X format support is dropped. It was experimental to
allow this kind of things. All elements not directly related to the binary
format remain flagged "b2x" because they are still compatible.

23008:d3137827016a

    def getbundle(self, source, heads=None, common=None, bundlecaps=None,
                  format='HG10', **kwargs):
        cg = exchange.getbundle(self._repo, source, heads=heads,
                                common=common, bundlecaps=bundlecaps, **kwargs)
        if bundlecaps is not None and 'HG2X' in bundlecaps:
            # When requesting a bundle2, getbundle returns a stream to make the
            # wire level function happier. We need to build a proper object
            # from it in local peer.
            cg = bundle2.unbundle20(self.ui, cg)
        return cg

23009:90f86ad3d4ff

    def getbundle(self, source, heads=None, common=None, bundlecaps=None,
                  format='HG10', **kwargs):
        cg = exchange.getbundle(self._repo, source, heads=heads,
                                common=common, bundlecaps=bundlecaps, **kwargs)
        if bundlecaps is not None and 'HG2Y' in bundlecaps:
            # When requesting a bundle2, getbundle returns a stream to make the
            # wire level function happier. We need to build a proper object
            # from it in local peer.
            cg = bundle2.unbundle20(self.ui, cg)
        return cg