subrepo: add the parent context to hgsubrepo This brings parity with gitsubrepo and svnsubrepo (which already reference their parent), and will be used in an upcoming patch. I'm a bit concerned that the parent context could get stale (consider what happens when the parent repo is reverted for example). I tried adding the parent context to the substate tuple so that the parent is available everywhere a state change is possible, but that made submerge() unhappy. Even with removing the parent context inside submerge(), I wasn't able to get all of the test diffs fixed. But since the other subrepos reference their parent too, if there is a problem, it is a preexisting one (that nobody seems to be running into). It can be fixed if/when it pops up.

--- a/mercurial/subrepo.py	Thu Mar 19 21:26:18 2015 -0700
+++ b/mercurial/subrepo.py	Wed Mar 18 22:56:41 2015 -0400
@@ -519,6 +519,7 @@
         super(hgsubrepo, self).__init__(ctx.repo().ui)
         self._path = path
         self._state = state
+        self._ctx = ctx
         r = ctx.repo()
         root = r.wjoin(path)
         create = not r.wvfs.exists('%s/.hg' % path)