view tests/test-topic-push-concurrent-on.t @ 3846:f9dad99a90d5

evolve: create a new commit instead of amending one of the divergents

This patch changes the behavior of evolve command while resolving
content-divergence to create a new commit instead of amending one of the
divergent ones.

In past, I have made this change, backed out this change and now today again I
am doing this change, so let's dive in some history.

Using cmdrewrite.amend() was never a good option as that requires hack to delete
the evolvestate and also gives us less control over things. We can't make the
commit on top of different parents as that of content-divergent ones. Due to all
these, I first made this change to create a new commit instead of amending one.

But, after few days, there was flakiness observed in the tests and turned out
that we need to do some dirstate dance as repo.dirstate.setparents() does not
always fix the dirstate. That flakiness was a blocker for progress at that time
and we decided to switch to amend back so that we can have things working with
some hacks and we can later fix the implementation part.

Now, yesterday while tackling resolving content-divergence of a stack which is
as follows:

C1 C2
 | |
B1 B2
 | |
A1 A2
 \/
base

where, A1-A2, B1-B2, C1-C2 are content-divergent with each other. Now we can
resolve A1-A2 very well because they have the same parent and let's say that
resolution leads to A3.
Now, we want to resolve B1-B2 and make the new resolution commit on top of A3 so
that we can end up something like:

C3
 |
B3
 |
A3
 |
base

however, amending one of the divergent changesets, it's not possible to create a
commit on a different parent like A3 here without some relocation. We should
prevent relocation as that may leads to some conflicts and should change the
parent before committing.

So, looking ahead, we can't move with using amend as still using that we will
need some relocation hacks making code ugly and prone to bad behaviors, bugs.
Let's change back to creating a new commit so that we can move forward in a good
way.

About repo.dirstate.setparents() not setting the dirstate, I have researched
yesterday night about how we can do that and found out that we can use
cmdrewrite._uncommitdirstate() here. Expect upcoming patches to improve the
documentation of that function.

There are lot of test changes because of change in hash but there is no behavior
change. The only behavior change is in test-evolve-abort-contentdiv.t which is
nice because creating a new commit helps us in stripping that while aborting.
We have a lot of testing of content-divergence and no behavior change gives
enough confidence for making this change.

I reviewed the patch carefully to make sure there is no behavior change and I
suggest reviewer to do the same.

# same as test-topic-push but with the concurrent push feature on

  $ . "$TESTDIR/testlib/topic_setup.sh"

  $ cat << EOF >> $HGRCPATH
  > [ui]
  > logtemplate = {rev} {branch} {get(namespaces, "topics")} {phase} {desc|firstline}\n
  > ssh =python "$RUNTESTDIR/dummyssh"
  > [server]
  > concurrent-push-mode=check-related
  > EOF

  $ hg init main
  $ hg init draft
  $ cat << EOF >> draft/.hg/hgrc
  > [phases]
  > publish=False
  > EOF
  $ hg clone main client
  updating to branch default
  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ cat << EOF >> client/.hg/hgrc
  > [paths]
  > draft=../draft
  > EOF


Testing core behavior to make sure we did not break anything
============================================================

Pushing a first changeset

  $ cd client
  $ echo aaa > aaa
  $ hg add aaa
  $ hg commit -m 'CA'
  $ hg outgoing -G
  comparing with $TESTTMP/main (glob)
  searching for changes
  @  0 default  draft CA
  
  $ hg push
  pushing to $TESTTMP/main (glob)
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 1 changes to 1 files

Pushing two heads

  $ echo aaa > bbb
  $ hg add bbb
  $ hg commit -m 'CB'
  $ echo aaa > ccc
  $ hg up 'desc(CA)'
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ hg add ccc
  $ hg commit -m 'CC'
  created new head
  (consider using topic for lightweight branches. See 'hg help topic')
  $ hg outgoing -G
  comparing with $TESTTMP/main (glob)
  searching for changes
  @  2 default  draft CC
  
  o  1 default  draft CB
  
  $ hg push
  pushing to $TESTTMP/main (glob)
  searching for changes
  abort: push creates new remote head 9fe81b7f425d!
  (merge or see 'hg help push' for details about pushing new heads)
  [255]
  $ hg outgoing -r 'desc(CB)' -G
  comparing with $TESTTMP/main (glob)
  searching for changes
  o  1 default  draft CB
  
  $ hg push -r 'desc(CB)'
  pushing to $TESTTMP/main (glob)
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 1 changes to 1 files

Pushing a new branch

  $ hg branch mountain
  marked working directory as branch mountain
  (branches are permanent and global, did you want a bookmark?)
  $ hg commit --amend
  $ hg outgoing -G
  comparing with $TESTTMP/main (glob)
  searching for changes
  @  3 mountain  draft CC
  
  $ hg push 
  pushing to $TESTTMP/main (glob)
  searching for changes
  abort: push creates new remote branches: mountain!
  (use 'hg push --new-branch' to create new remote branches)
  [255]
  $ hg push --new-branch
  pushing to $TESTTMP/main (glob)
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 1 changes to 1 files (+1 heads)
  1 new obsolescence markers

Including on non-publishing

  $ hg push --new-branch draft
  pushing to $TESTTMP/draft (glob)
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 3 changesets with 3 changes to 3 files (+1 heads)
  1 new obsolescence markers

Testing topic behavior
======================

Local peer tests
----------------

  $ hg up -r 'desc(CA)'
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ hg topic babar
  marked working directory as topic: babar
  $ echo aaa > ddd
  $ hg add ddd
  $ hg commit -m 'CD'
  active topic 'babar' grew its first changeset
  (see 'hg help topics' for more information)
  $ hg log -G # keep track of phase because I saw some strange bug during developement
  @  4 default babar draft CD
  |
  | o  3 mountain  public CC
  |/
  | o  1 default  public CB
  |/
  o  0 default  public CA
  

Pushing a new topic to a non publishing server should not be seen as a new head

  $ hg push draft
  pushing to $TESTTMP/draft (glob)
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 1 changes to 1 files (+1 heads)
  $ hg log -G
  @  4 default babar draft CD
  |
  | o  3 mountain  public CC
  |/
  | o  1 default  public CB
  |/
  o  0 default  public CA
  

Pushing a new topic to a publishing server should be seen as a new head

  $ hg push
  pushing to $TESTTMP/main (glob)
  searching for changes
  abort: push creates new remote head 67f579af159d!
  (merge or see 'hg help push' for details about pushing new heads)
  [255]
  $ hg log -G
  @  4 default babar draft CD
  |
  | o  3 mountain  public CC
  |/
  | o  1 default  public CB
  |/
  o  0 default  public CA
  

wireprotocol tests
------------------

  $ hg up -r 'desc(CA)'
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ hg topic celeste
  marked working directory as topic: celeste
  $ echo aaa > eee
  $ hg add eee
  $ hg commit -m 'CE'
  active topic 'celeste' grew its first changeset
  (see 'hg help topics' for more information)
  $ hg log -G # keep track of phase because I saw some strange bug during developement
  @  5 default celeste draft CE
  |
  | o  4 default babar draft CD
  |/
  | o  3 mountain  public CC
  |/
  | o  1 default  public CB
  |/
  o  0 default  public CA
  

Pushing a new topic to a non publishing server without topic -> new head

  $ cat << EOF >> ../draft/.hg/hgrc
  > [extensions]
  > topic=!
  > EOF
  $ hg push ssh://user@dummy/draft
  pushing to ssh://user@dummy/draft
  searching for changes
  abort: push creates new remote head 84eaf32db6c3!
  (merge or see 'hg help push' for details about pushing new heads)
  [255]
  $ hg log -G
  @  5 default celeste draft CE
  |
  | o  4 default babar draft CD
  |/
  | o  3 mountain  public CC
  |/
  | o  1 default  public CB
  |/
  o  0 default  public CA
  

Pushing a new topic to a non publishing server should not be seen as a new head

  $ printf "topic=" >> ../draft/.hg/hgrc
  $ hg config extensions.topic >> ../draft/.hg/hgrc
  $ hg push ssh://user@dummy/draft
  pushing to ssh://user@dummy/draft
  searching for changes
  remote: adding changesets
  remote: adding manifests
  remote: adding file changes
  remote: added 1 changesets with 1 changes to 1 files (+1 heads)
  $ hg log -G
  @  5 default celeste draft CE
  |
  | o  4 default babar draft CD
  |/
  | o  3 mountain  public CC
  |/
  | o  1 default  public CB
  |/
  o  0 default  public CA
  

Pushing a new topic to a publishing server should be seen as a new head

  $ hg push ssh://user@dummy/main
  pushing to ssh://user@dummy/main
  searching for changes
  abort: push creates new remote head 67f579af159d!
  (merge or see 'hg help push' for details about pushing new heads)
  [255]
  $ hg log -G
  @  5 default celeste draft CE
  |
  | o  4 default babar draft CD
  |/
  | o  3 mountain  public CC
  |/
  | o  1 default  public CB
  |/
  o  0 default  public CA
  

Check that we reject multiple head on the same topic
----------------------------------------------------

  $ hg up 'desc(CB)'
  1 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ hg topic babar
  marked working directory as topic: babar
  $ echo aaa > fff
  $ hg add fff
  $ hg commit -m 'CF'
  $ hg log -G
  @  6 default babar draft CF
  |
  | o  5 default celeste draft CE
  | |
  | | o  4 default babar draft CD
  | |/
  | | o  3 mountain  public CC
  | |/
  o |  1 default  public CB
  |/
  o  0 default  public CA
  

  $ hg push draft
  pushing to $TESTTMP/draft (glob)
  searching for changes
  abort: push creates new remote head f0bc62a661be on branch 'default:babar'!
  (merge or see 'hg help push' for details about pushing new heads)
  [255]

Multiple head on a branch merged in a topic changesets
------------------------------------------------------------------------


  $ hg up 'desc(CA)'
  0 files updated, 0 files merged, 2 files removed, 0 files unresolved
  $ echo aaa > ggg
  $ hg add ggg
  $ hg commit -m 'CG'
  created new head
  (consider using topic for lightweight branches. See 'hg help topic')
  $ hg up 'desc(CF)'
  switching to topic babar
  2 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ hg merge 'desc(CG)'
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  (branch merge, don't forget to commit)
  $ hg commit -m 'CM'
  $ hg log -G
  @    8 default babar draft CM
  |\
  | o  7 default  draft CG
  | |
  o |  6 default babar draft CF
  | |
  | | o  5 default celeste draft CE
  | |/
  | | o  4 default babar draft CD
  | |/
  | | o  3 mountain  public CC
  | |/
  o |  1 default  public CB
  |/
  o  0 default  public CA
  

Reject when pushing to draft

  $ hg push draft -r .
  pushing to $TESTTMP/draft (glob)
  searching for changes
  abort: push creates new remote head 4937c4cad39e!
  (merge or see 'hg help push' for details about pushing new heads)
  [255]


Reject when pushing to publishing

  $ hg push -r .
  pushing to $TESTTMP/main (glob)
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 3 changesets with 2 changes to 2 files

  $ cd ..

Test phase move
==================================

setup, two repo knowns about two small topic branch

  $ hg init repoA
  $ hg clone repoA repoB
  updating to branch default
  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ cat << EOF >> repoA/.hg/hgrc
  > [phases]
  > publish=False
  > EOF
  $ cat << EOF >> repoB/.hg/hgrc
  > [phases]
  > publish=False
  > EOF
  $ cd repoA
  $ echo aaa > base
  $ hg add base
  $ hg commit -m 'CBASE'
  $ echo aaa > aaa
  $ hg add aaa
  $ hg topic topicA
  marked working directory as topic: topicA
  $ hg commit -m 'CA'
  active topic 'topicA' grew its first changeset
  (see 'hg help topics' for more information)
  $ hg up 'desc(CBASE)'
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ echo aaa > bbb
  $ hg add bbb
  $ hg topic topicB
  marked working directory as topic: topicB
  $ hg commit -m 'CB'
  active topic 'topicB' grew its first changeset
  (see 'hg help topics' for more information)
  $ cd ..
  $ hg push -R repoA repoB
  pushing to repoB
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 3 changesets with 3 changes to 3 files (+1 heads)
  $ hg log -G -R repoA
  @  2 default topicB draft CB
  |
  | o  1 default topicA draft CA
  |/
  o  0 default  draft CBASE
  

We turn different topic to public on each side,

  $ hg -R repoA phase --public topicA
  $ hg -R repoB phase --public topicB

Pushing should complain because it create to heads on default

  $ hg push -R repoA repoB
  pushing to repoB
  searching for changes
  no changes found
  abort: push create a new head on branch "default"
  [255]