diff mercurial/upgrade.py @ 39996:dbcb466d0065

localrepo: define storage backend in creation options (API)

We add an experimental config option to define the storage backend
for new repositories. By default, it uses "revlogv1," which maps to
the current and only modern supported repository format.

We add a "backend" creation option to control which backend to
use. It defaults to using the value from the config option.

newreporequirements() will now barf if it sees a "backend" value
that isn't "revlogv1." This forces extensions to monkeypatch the
function to handle requirements derivation for custom backends.

In order for this to "just work," we factored out obtaining the
default creation options into its own function and made callers
of newreporequirements() responsible for passing in valid data.
Without this, direct callers of newreporequirements() wouldn't
get the proper results.

Differential Revision: https://phab.mercurial-scm.org/D4791

--- a/mercurial/upgrade.py	Thu Sep 27 09:23:17 2018 -0700
+++ b/mercurial/upgrade.py	Fri Sep 28 09:46:50 2018 -0700
@@ -199,7 +199,8 @@
 
     @staticmethod
     def _newreporequirements(ui):
-        return localrepo.newreporequirements(ui)
+        return localrepo.newreporequirements(
+            ui, localrepo.defaultcreateopts(ui))
 
     @classmethod
     def fromrepo(cls, repo):
@@ -747,7 +748,8 @@
 
     # FUTURE there is potentially a need to control the wanted requirements via
     # command arguments or via an extension hook point.
-    newreqs = localrepo.newreporequirements(repo.ui)
+    newreqs = localrepo.newreporequirements(
+        repo.ui, localrepo.defaultcreateopts(repo.ui))
     newreqs.update(preservedrequirements(repo))
 
     noremovereqs = (repo.requirements - newreqs -