view tests/test-evolve-obshistory-prune.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 obslog and other commands accessing obsolete revisions.

Global setup
============

  $ . $TESTDIR/testlib/obshistory_setup.sh

Test output with pruned commit
==============================

Check output on the client side
-------------------------------

  $ hg init $TESTTMP/local-prune
  $ hg init $TESTTMP/server
  $ cd $TESTTMP/local-prune
  $ mkcommit ROOT
  $ mkcommit A0 # 0
  $ mkcommit B0 # 1
  $ sync
  $ hg log --hidden -G
  @  changeset:   2:0dec01379d3b
  |  tag:         tip
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     B0
  |
  o  changeset:   1:471f378eab4c
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     A0
  |
  o  changeset:   0:ea207398892e
     user:        test
     date:        Thu Jan 01 00:00:00 1970 +0000
     summary:     ROOT
  
  $ hg prune -r 'desc(B0)'
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  working directory is now at 471f378eab4c
  1 changesets pruned
  $ sync
  $ hg log --hidden -G
  x  changeset:   2:0dec01379d3b
  |  tag:         tip
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  obsolete:    pruned using prune
  |  summary:     B0
  |
  @  changeset:   1:471f378eab4c
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     A0
  |
  o  changeset:   0:ea207398892e
     user:        test
     date:        Thu Jan 01 00:00:00 1970 +0000
     summary:     ROOT
  

Actual test
-----------

  $ hg obslog 'desc(B0)' --hidden --patch
  x  0dec01379d3b (2) B0
       pruned using prune by test (Thu Jan 01 00:00:00 1970 +0000)
         (No patch available, no predecessors)
  
  $ hg obslog 'desc(B0)' --hidden --no-graph -Tjson | "$PYTHON" -m json.tool
  [
      {
          "markers": [
              {
                  "dates": [
                      [
                          *, (glob)
                          0
                      ]
                  ],
                  "operations": [
                      "prune"
                  ],
                  "users": [
                      "test"
                  ],
                  "verb": "pruned"
              }
          ],
          "node": "0dec01379d3be6318c470ead31b1fe7ae7cb53d5",
          "shortdescription": "B0"
      }
  ]
  $ hg obslog 'desc(A0)' --patch
  @  471f378eab4c (1) A0
  
  $ hg obslog 'desc(A0)' --no-graph -Tjson | "$PYTHON" -m json.tool
  [
      {
          "markers": [],
          "node": "471f378eab4c5e25f6c77f785b27c936efb22874",
          "shortdescription": "A0"
      }
  ]
  $ hg up 1
  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg up 0dec01379d3b
  abort: hidden revision '0dec01379d3b' is pruned
  (use --hidden to access hidden revisions)
  [255]
  $ hg up --hidden -r 'desc(B0)'
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  updated to hidden changeset 0dec01379d3b
  (hidden revision '0dec01379d3b' is pruned)
  working directory parent is obsolete! (0dec01379d3b)
  (use 'hg evolve' to update to its parent successor)

Check output on the server side
-------------------------------

  $ hg obslog -f -R $TESTTMP/server --patch 0dec01379d3b --hidden
  x  0dec01379d3b (2) B0
       pruned using prune by test (Thu Jan 01 00:00:00 1970 +0000)
         (No patch available, no predecessors)
  
# TODO ADD amend + prune