comparison mercurial/tags.py @ 25380:eaa456c5e699

tags: support reading tags cache without populating

An upcoming patch will teach the bundle2 protocol to transfer .hgtags
fnodes to the client. We don't want this to incur any extra work
at serve time. Create an optional cache query mode that doesn't
populate the cache as a side-effect.

25379:894bcdbb9e7a

            # slightly less evil than copying a potentially large array slice.
            for i in range(rawlen - wantedlen):
                self._raw.pop()
            self._dirtyoffset = len(self._raw)

    def getfnode(self, node):
        """Obtain the filenode of the .hgtags file at a specified revision.

        If the value is in the cache, the entry will be validated and returned.
        Otherwise, the filenode will be computed and returned.

        If an .hgtags does not exist at the specified revision, nullid is
        returned.
        """
        ctx = self._repo[node]

                self.hitcount += 1
                return record[4:]

            # Fall through.

        # If we get here, the entry is either missing or invalid. Populate it.
        try:
            fnode = ctx.filenode('.hgtags')
        except error.LookupError:
            # No .hgtags file on this revision.
            fnode = nullid

25380:eaa456c5e699

            # slightly less evil than copying a potentially large array slice.
            for i in range(rawlen - wantedlen):
                self._raw.pop()
            self._dirtyoffset = len(self._raw)

    def getfnode(self, node, computemissing=True):
        """Obtain the filenode of the .hgtags file at a specified revision.

        If the value is in the cache, the entry will be validated and returned.
        Otherwise, the filenode will be computed and returned unless
        "computemissing" is False, in which case None will be returned without
        any potentially expensive computation being performed.

        If an .hgtags does not exist at the specified revision, nullid is
        returned.
        """
        ctx = self._repo[node]

                self.hitcount += 1
                return record[4:]

            # Fall through.

        # If we get here, the entry is either missing or invalid.

        if not computemissing:
            return None

        # Populate missing entry.
        try:
            fnode = ctx.filenode('.hgtags')
        except error.LookupError:
            # No .hgtags file on this revision.
            fnode = nullid