branchcache: add a "pure topological head" fast path
In a narrow but actually quick common case, all topological heads are all on
the same branch and all open. In this case, computing the branch map is very
simple. We can quickly detect situation where this situation will not change.
So we update the V3 format to be able to express this situation and upgrade the
update code to detect we remains in that mode.
The branch cache is populated with the actual value when the branch map is
accessed, but the update_disk method can do the update without needing to
populate it.
====================================
Testing head checking code: Case B-5
====================================
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TestCase 5: multi-changeset branch, mix of pruned and superseded
.. old-state:
..
.. * 3 changeset branch
..
.. new-state:
..
.. * old head is pruned
.. * old mid is superseded
.. * old root is pruned
..
.. expected-result:
..
.. * push allowed
..
.. graph-summary:
..
.. B ⊗
.. |
.. A ø⇠◔ A'
.. | |
.. B ⊗ |
.. |/
.. ●
$ . $TESTDIR/testlib/push-checkheads-util.sh
Test setup
----------
$ mkdir B5
$ cd B5
$ setuprepos
creating basic server and client repo
updating to branch default
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ cd server
$ mkcommit B0
$ mkcommit C0
$ cd ../client
$ hg pull
pulling from $TESTTMP/B5/server
searching for changes
adding changesets
adding manifests
adding file changes
added 2 changesets with 2 changes to 2 files
new changesets d73caddc5533:821fb21d0dd2 (2 drafts)
(run 'hg update' to get a working copy)
$ hg up 0
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ mkcommit B1
created new head
$ hg debugobsolete --record-parents `getid "desc(A0)"`
1 new obsolescence markers
obsoleted 1 changesets
2 new orphan changesets
$ hg debugobsolete `getid "desc(B0)"` `getid "desc(B1)"`
1 new obsolescence markers
obsoleted 1 changesets
$ hg debugobsolete --record-parents `getid "desc(C0)"`
1 new obsolescence markers
obsoleted 1 changesets
$ hg log -G --hidden
@ 25c56d33e4c4 (draft): B1
|
| x 821fb21d0dd2 (draft): C0
| |
| x d73caddc5533 (draft): B0
| |
| x 8aaa48160adc (draft): A0
|/
o 1e4be0697311 (public): root
Actual testing
--------------
$ hg push
pushing to $TESTTMP/B5/server
searching for changes
adding changesets
adding manifests
adding file changes
added 1 changesets with 1 changes to 1 files (+1 heads)
3 new obsolescence markers
obsoleted 3 changesets
$ cd ../..