[PATCH 4 of 9] unionrepo: use a lower level overide in unionrepo too

[Yuya Nishihara]

On Fri, 30 Aug 2019 18:39:33 +0200, Pierre-Yves David wrote:
> # HG changeset patch
> # User Pierre-Yves David <pierre-yves.david at octobus.net>
> # Date 1567179938 -7200
> #      Fri Aug 30 17:45:38 2019 +0200
> # Node ID b3b9c5961371426a896a47095a5ff8941174520a
> # Parent  680d5166e27cd9029c7e1c6f983fb98e677ea10f
> # EXP-Topic sidedata-prep
> # Available At https://bitbucket.org/octobus/mercurial-devel/
> #              hg pull https://bitbucket.org/octobus/mercurial-devel/ -r b3b9c5961371
> unionrepo: use a lower level overide in unionrepo too

> @@ -105,16 +101,13 @@ class unionrevlog(revlog.revlog):
>              node = nodeorrev
>              rev = self.rev(node)
>  
> -        if node == nullid:
> -            return ""
> -
>          if rev > self.repotiprev:
> -            text = self.revlog2.revision(node)
> -            self._revisioncache = (node, rev, text)
> +            # work around manifestrevlog NOT being a revlog
> +            revlog2 = getattr(self.revlog2, '_revlog', self.revlog2)
> +            func = revlog2._revisiondata

So we no longer set self._revisioncache, which I think is correct, but just
note that in case it wasn't.