view tests/test-push-checkheads-pruned-B6.t @ 5777:c5dfbbe4363d

evolve: when relocating, optionally first try to do it using in-memory merge

This patch adds a config option to let run evolve's relocation step
using in-memory merge. It is disabled by default. When the option is
on, the relocation is first attempted in memory. If that fails because
of merge conflicts, it retries that commit in the working copy.

There are a few reasons that I made it configurable. The most
important one is that the precommit hook won't trigger when using
in-memory merge. Another reason is that it lets us roll out the
feature slowly to our users at Google.

For now, we also update the working copy after creating the commit (in the
successful case, when there are no merge conflicts). The next patch will make it
so we don't do that update.

Because of the unnecessary working-copy update, this patch doesn't
provide any benefit on its own. Evolving 29 commits that each change
one line in the hg slows down from ~4.5s to ~4.8s when the config
option is on.

I've added `#testcases inmemory ondisk` to select `.t` files. Almost
all differences are because of the new "hit merge conflicts" message
and retrying the merge. There's also one difference in
`test-stabilize-order.t` caused by the different order of working copy
updates (we now update the working copy at the end).

====================================
Testing head checking code: Case B-6
====================================

Mercurial checks for the introduction of new heads on push. Evolution comes
into play to detect if existing branches on the server are being replaced by
some of the new one we push.

This case is part of a series of tests checking this behavior.

Category B: simple case involving pruned changesets
TestCase 6: single changesets, pruned then superseded (on a new changeset)

.. old-state:
..
.. * 1 changeset branch
..
.. new-state:
..
.. * old branch is rewritten onto another one,
.. * the new version is then pruned.
..
.. expected-result:
..
.. * push allowed
..
.. graph-summary:
..
..   A ø⇠⊗ A'
..     | |
..     | ◔ B
..     |/
..     ●

  $ . $TESTDIR/testlib/push-checkheads-util.sh

Test setup
----------

  $ mkdir B6
  $ cd B6
  $ setuprepos
  creating basic server and client repo
  updating to branch default
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ cd client
  $ hg up 0
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ mkcommit B0
  created new head
  $ mkcommit A1
  $ hg up 'desc(B0)'
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ hg debugobsolete `getid "desc(A0)"` `getid "desc(A1)"`
  1 new obsolescence markers
  obsoleted 1 changesets
  $ hg debugobsolete --record-parents `getid "desc(A1)"`
  1 new obsolescence markers
  obsoleted 1 changesets
  $ hg log -G --hidden
  x  ba93660aff8d (draft): A1
  |
  @  74ff5441d343 (draft): B0
  |
  | x  8aaa48160adc (draft): A0
  |/
  o  1e4be0697311 (public): root
  

Actual testing
--------------

  $ hg push
  pushing to $TESTTMP/B6/server (glob)
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 1 changes to 1 files (+1 heads)
  2 new obsolescence markers
  obsoleted 1 changesets

  $ cd ../..