comparison tests/test-rename-merge1.t @ 42590:ab416b5d9b91

tests: add more tests of copy tracing with removed and re-added files

We had a test where the destination of a copy was removed and then
added back. This patch adds similar cases where the break in history
instead happens to the source file. There are three versions of this:

 1. The break happens before the rename.

 2. The break happens on a branch parallel to the rename (where copy
    tracing is done via the merge base)

 3. The source is added on each side of the merge base. The break in
    history is thus in the form of a deletion when going backwards to
    the merge base and the re-add happens on the other branch.

I've also added calls to `hg graft` in these cases to show the
breakage in issue 6163.

Another factor in these cases is matching nodeid (checked in
copies._tracefile()). I've made two copies each of the cases to show
the impact of that. One of these is the same as a test in
test-rename-merge1.t, so I also deleted that test from there.

Some of these tests currently fail, where "fail" is based on my
current thinking of how things should work. I had initially thought
that we should be more strict about not tracing copies across commits
where the file did not exist, but issue 6163 made me reconsider.

The only test case here that behaved differently in 4.9 is the
exact case reported in issue 6163.

Differential Revision: https://phab.mercurial-scm.org/D6599

42589:67bf11597eb8

  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  (branch merge, don't forget to commit)
  $ hg status
  M newfile
  $ cd ..

Check that file is considered unrelated when deleted and recreated

  $ hg init unrelated
  $ cd unrelated
  $ echo foo > file
  $ hg add file
  $ hg commit -m "added file"
  $ hg cp file newfile
  $ hg commit -m "copy file"
  $ hg update 0
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ hg rm file
  $ hg commit -m "deleted file"
  created new head
  $ echo bar > file
  $ hg add file
  $ hg ci -m 'recreate file'
  $ hg log -G -T '{rev} {desc}\n'
  @  3 recreate file
  |
  o  2 deleted file
  |
  | o  1 copy file
  |/
  o  0 added file
  
BROKEN: this is inconsistent with `hg merge` (below), which doesn't consider
'file' renamed same since it was deleted for a while
  $ hg st --copies --rev 3 --rev 1
  M file
  A newfile
    file
  $ hg merge --debug 1
    unmatched files in other:
     newfile
    all copies found (* = to merge, ! = divergent, % = renamed and deleted):
     src: 'file' -> dst: 'newfile' 
    checking for directory renames
  resolving manifests
   branchmerge: True, force: False, partial: False
   ancestor: 19d7f95df299, local: 4e4a42b1cbdf+, remote: 45b14aae7432
   newfile: remote created -> g
  getting newfile
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  (branch merge, don't forget to commit)
  $ hg status
  M newfile
  $ cd ..

42590:ab416b5d9b91

  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  (branch merge, don't forget to commit)
  $ hg status
  M newfile
  $ cd ..