subrepo: introduce the nullsubrepo() method
This will be used in an upcoming patch. It's a one-off use, but seems better to
be contained in the subrepo module, than for the next patch to overwrite the
_ctx and _state fields in another module. '' is used as the default revision in
subrepo.state() if it can't be found, so it seems like a safe choice.
--- a/mercurial/subrepo.py Thu May 07 17:15:24 2015 +0900
+++ b/mercurial/subrepo.py Wed Jun 03 13:45:42 2015 -0400
@@ -340,6 +340,25 @@
raise util.Abort(_('unknown subrepo type %s') % state[2])
return types[state[2]](ctx, path, state[:2])
+def nullsubrepo(ctx, path, pctx):
+ """return an empty subrepo in pctx for the extant subrepo in ctx"""
+ # subrepo inherently violates our import layering rules
+ # because it wants to make repo objects from deep inside the stack
+ # so we manually delay the circular imports to not break
+ # scripts that don't use our demand-loading
+ global hg
+ import hg as h
+ hg = h
+
+ pathutil.pathauditor(ctx.repo().root)(path)
+ state = ctx.substate[path]
+ if state[2] not in types:
+ raise util.Abort(_('unknown subrepo type %s') % state[2])
+ subrev = ''
+ if state[2] == 'hg':
+ subrev = "0" * 40
+ return types[state[2]](pctx, path, (state[0], subrev))
+
def newcommitphase(ui, ctx):
commitphase = phases.newcommitphase(ui)
substate = getattr(ctx, "substate", None)