diff tests/test-rebase-conflicts.t @ 29593:953839de96ab

bundle2: store changeset count when creating file bundles

The bundle2 changegroup part has an advisory param saying how many
changesets are in the part. Before this patch, we were setting
this part when generating bundle2 parts via the wire protocol but
not when generating local bundle2 files.

A side effect of not setting the changeset count part is that progress
bars don't work when applying changesets. As the tests show, this
impacted clone bundles, shelve, backup bundles, `hg unbundle`, and
anything touching bundle2 files.

This patch adds a backdoor to allow us to pass state from
changegroup generation into the unbundler. We store the number
of changesets in the changegroup in this state and use it to
populate the aforementioned advisory part parameter when generating
the bundle2 bundle.

I concede that I'm not thrilled by how state is being passed in
changegroup.py (it feels a bit hacky). I would love to overhaul the
rather confusing set of functions in changegroup.py with something that
passes rich objects around instead of e.g. low-level generators.
However, given the code freeze for 3.9 is imminent, I'd rather not
undertake this endeavor right now. This feels like the easiest way
to get the parameter added to the changegroup part.

--- a/tests/test-rebase-conflicts.t	Sun Jul 17 15:10:30 2016 -0700
+++ b/tests/test-rebase-conflicts.t	Sun Jul 17 15:13:51 2016 -0700
@@ -279,7 +279,7 @@
   e31216eec445e44352c5f01588856059466a24c9
   2f2496ddf49d69b5ef23ad8cf9fb2e0e4faf0ac2
   bundle2-output-bundle: "HG20", (1 params) 1 parts total
-  bundle2-output-part: "changegroup" (params: 1 mandatory) streamed payload
+  bundle2-output-part: "changegroup" (params: 1 mandatory 1 advisory) streamed payload
   saved backup bundle to $TESTTMP/issue4041/.hg/strip-backup/e31216eec445-15f7a814-backup.hg (glob)
   3 changesets found
   list of changesets:
@@ -287,10 +287,10 @@
   19c888675e133ab5dff84516926a65672eaf04d9
   2a7f09cac94c7f4b73ebd5cd1a62d3b2e8e336bf
   bundle2-output-bundle: "HG20", 1 parts total
-  bundle2-output-part: "changegroup" (params: 1 mandatory) streamed payload
+  bundle2-output-part: "changegroup" (params: 1 mandatory 1 advisory) streamed payload
   adding branch
   bundle2-input-bundle: with-transaction
-  bundle2-input-part: "changegroup" (params: 1 mandatory) supported
+  bundle2-input-part: "changegroup" (params: 1 mandatory 1 advisory) supported
   adding changesets
   add changeset 4c9fbe56a16f
   add changeset 19c888675e13