view tests/test-merge7.t @ 45584:4c8a93ec6908

merge: store commitinfo if these is a dc or cd conflict

delete-changed or changed-delete conflicts can either be resolved by mergetool,
if some tool is passed and using or by user choose something on prompt or user
doing some `hg revert` after choosing the file to remain conflicted.

If the user decides to keep the changed side, on commit we just reuse the parent
filenode. This is mostly fine unless we are in a distributed environment and
people are doing criss-cross merges.

Since, we don't have recursive merges or any other way of describing the end
result of the merge was an explicit choice and it should be differentiated from
it's ancestors, merge algo during criss-cross merges fails to take in account
the explicit choice made by user and end up with a what-can-be-said-wrong-merge.

The solution which we are trying to fix this is by creating a filenode on commit
instead of reusing the parent filenode. This helps differentiate between
pre-merged filenode and post-merge filenode and kind of tells about the choice
user made.

To implement creating new filenode functionality, we store info about these
files in mergestate so that we can read them on commit and force create a new
filenode.

Differential Revision: https://phab.mercurial-scm.org/D8988

initial
  $ hg init test-a
  $ cd test-a
  $ cat >test.txt <<"EOF"
  > 1
  > 2
  > 3
  > EOF
  $ hg add test.txt
  $ hg commit -m "Initial"

clone
  $ cd ..
  $ hg clone test-a test-b
  updating to branch default
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved

change test-a
  $ cd test-a
  $ cat >test.txt <<"EOF"
  > one
  > two
  > three
  > EOF
  $ hg commit -m "Numbers as words"

change test-b
  $ cd ../test-b
  $ cat >test.txt <<"EOF"
  > 1
  > 2.5
  > 3
  > EOF
  $ hg commit -m "2 -> 2.5"

now pull and merge from test-a
  $ hg pull ../test-a
  pulling from ../test-a
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 1 changes to 1 files (+1 heads)
  new changesets 96b70246a118
  (run 'hg heads' to see heads, 'hg merge' to merge)
  $ hg merge
  merging test.txt
  warning: conflicts while merging test.txt! (edit, then use 'hg resolve --mark')
  0 files updated, 0 files merged, 0 files removed, 1 files unresolved
  use 'hg resolve' to retry unresolved file merges or 'hg merge --abort' to abandon
  [1]
resolve conflict
  $ cat >test.txt <<"EOF"
  > one
  > two-point-five
  > three
  > EOF
  $ rm -f *.orig
  $ hg resolve -m test.txt
  (no more unresolved files)
  $ hg commit -m "Merge 1"

change test-a again
  $ cd ../test-a
  $ cat >test.txt <<"EOF"
  > one
  > two-point-one
  > three
  > EOF
  $ hg commit -m "two -> two-point-one"

pull and merge from test-a again
  $ cd ../test-b
  $ hg pull ../test-a
  pulling from ../test-a
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 1 changes to 1 files (+1 heads)
  new changesets 40d11a4173a8
  (run 'hg heads' to see heads, 'hg merge' to merge)
  $ hg merge --debug
  resolving manifests
   branchmerge: True, force: False, partial: False
   ancestor: 96b70246a118, local: 50c3a7e29886+, remote: 40d11a4173a8
   preserving test.txt for resolve of test.txt
  starting 4 threads for background file closing (?)
   test.txt: versions differ -> m (premerge)
  picked tool ':merge' for test.txt (binary False symlink False changedelete False)
  merging test.txt
  my test.txt@50c3a7e29886+ other test.txt@40d11a4173a8 ancestor test.txt@96b70246a118
   test.txt: versions differ -> m (merge)
  picked tool ':merge' for test.txt (binary False symlink False changedelete False)
  my test.txt@50c3a7e29886+ other test.txt@40d11a4173a8 ancestor test.txt@96b70246a118
  warning: conflicts while merging test.txt! (edit, then use 'hg resolve --mark')
  0 files updated, 0 files merged, 0 files removed, 1 files unresolved
  use 'hg resolve' to retry unresolved file merges or 'hg merge --abort' to abandon
  [1]

  $ cat test.txt
  one
  <<<<<<< working copy: 50c3a7e29886 - test: Merge 1
  two-point-five
  =======
  two-point-one
  >>>>>>> merge rev:    40d11a4173a8 - test: two -> two-point-one
  three

  $ hg debugindex test.txt
     rev linkrev nodeid       p1           p2
       0       0 01365c4cca56 000000000000 000000000000
       1       1 7b013192566a 01365c4cca56 000000000000
       2       2 8fe46a3eb557 01365c4cca56 000000000000
       3       3 fc3148072371 7b013192566a 8fe46a3eb557
       4       4 d40249267ae3 8fe46a3eb557 000000000000

  $ hg log
  changeset:   4:40d11a4173a8
  tag:         tip
  parent:      2:96b70246a118
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     two -> two-point-one
  
  changeset:   3:50c3a7e29886
  parent:      1:d1e159716d41
  parent:      2:96b70246a118
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     Merge 1
  
  changeset:   2:96b70246a118
  parent:      0:b1832b9d912a
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     Numbers as words
  
  changeset:   1:d1e159716d41
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     2 -> 2.5
  
  changeset:   0:b1832b9d912a
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     Initial
  

  $ cd ..