view tests/test-pathconflicts-merge.t @ 41247:a89b20a49c13

rust-cpython: using MissingAncestors from Python code

As precedently done with LazyAncestors on cpython.rs, we test for the
presence of the 'rustext' module.

incrementalmissingrevs() has two callers within the Mercurial core:
`setdiscovery.partialdiscovery` and the `only()` revset.

This move shows a significant discovery performance improvement
in cases where the baseline is slow: using perfdiscovery on the PyPy
repos, prepared with `contrib/discovery-helper <repo> 50 100`, we
get averaged medians of 403ms with the Rust version vs 742ms without
(about 45% better).

But there are still indications that performance can be worse in cases
the baseline is fast, possibly due to the conversion from Python to
Rust and back becoming the bottleneck. We could measure this on
mozilla-central in cases were the delta is just a few changesets.
This requires confirmation, but if that's the reason, then an
upcoming `partialdiscovery` fully in Rust should solve the problem.

Differential Revision: https://phab.mercurial-scm.org/D5551

Path conflict checking is currently disabled by default because of issue5716.
Turn it on for this test.

  $ cat >> $HGRCPATH << EOF
  > [experimental]
  > merge.checkpathconflicts=True
  > EOF

  $ hg init repo
  $ cd repo
  $ echo base > base
  $ hg add base
  $ hg commit -m "base"
  $ hg bookmark -i base
  $ mkdir a
  $ echo 1 > a/b
  $ hg add a/b
  $ hg commit -m "file"
  $ hg bookmark -i file
  $ echo 2 > a/b
  $ hg commit -m "file2"
  $ hg bookmark -i file2
  $ hg up 0
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved

#if symlink
  $ mkdir a
  $ ln -s c a/b
  $ hg add a/b
  $ hg commit -m "link"
  created new head
#else
  $ hg import -q --bypass - <<EOF
  > # HG changeset patch
  > link
  > 
  > diff --git a/a/b b/a/b
  > new file mode 120000
  > --- /dev/null
  > +++ b/a/b
  > @@ -0,0 +1,1 @@
  > +c
  > \ No newline at end of file
  > EOF
  $ hg up -q
#endif

  $ hg bookmark -i link
  $ hg up 0
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ mkdir -p a/b/c
  $ echo 2 > a/b/c/d
  $ hg add a/b/c/d
  $ hg commit -m "dir"
  created new head
  $ hg bookmark -i dir

Merge - local file conflicts with remote directory

  $ hg up file
  1 files updated, 0 files merged, 1 files removed, 0 files unresolved
  (activating bookmark file)
  $ hg bookmark -i
  $ hg merge --verbose dir
  resolving manifests
  a/b: path conflict - a file or link has the same name as a directory
  the local file has been renamed to a/b~0ed027b96f31
  resolve manually then use 'hg resolve --mark a/b'
  moving a/b to a/b~0ed027b96f31
  getting a/b/c/d
  1 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]
  $ hg status
  M a/b/c/d
  A a/b~0ed027b96f31
  R a/b
  $ hg resolve --all
  a/b: path conflict must be resolved manually
  $ hg forget a/b~0ed027b96f31 && rm a/b~0ed027b96f31
  $ hg resolve --mark a/b
  (no more unresolved files)
  $ hg commit -m "merge file and dir (deleted file)"

Merge - local symlink conflicts with remote directory

  $ hg up link
  1 files updated, 0 files merged, 1 files removed, 0 files unresolved
  (activating bookmark link)
  $ hg bookmark -i
  $ hg merge dir
  a/b: path conflict - a file or link has the same name as a directory
  the local file has been renamed to a/b~2ea68033e3be
  resolve manually then use 'hg resolve --mark a/b'
  1 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]
  $ hg status
  M a/b/c/d
  A a/b~2ea68033e3be
  R a/b
  $ hg resolve --list
  P a/b
  $ hg resolve --all
  a/b: path conflict must be resolved manually
  $ hg mv a/b~2ea68033e3be a/b.old
  $ hg resolve --mark a/b
  (no more unresolved files)
  $ hg resolve --list
  R a/b
  $ hg commit -m "merge link and dir (renamed link)"

Merge - local directory conflicts with remote file or link

  $ hg up dir
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  (activating bookmark dir)
  $ hg bookmark -i
  $ hg merge file
  a/b: path conflict - a file or link has the same name as a directory
  the remote file has been renamed to a/b~0ed027b96f31
  resolve manually then use 'hg resolve --mark a/b'
  1 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]
  $ hg status
  A a/b~0ed027b96f31
  $ hg resolve --all
  a/b: path conflict must be resolved manually
  $ hg mv a/b~0ed027b96f31 a/b/old-b
  $ hg resolve --mark a/b
  (no more unresolved files)
  $ hg commit -m "merge dir and file (move file into dir)"
  created new head
  $ hg merge file2
  merging a/b/old-b and a/b to a/b/old-b
  0 files updated, 1 files merged, 0 files removed, 0 files unresolved
  (branch merge, don't forget to commit)
  $ cat a/b/old-b
  2
  $ hg commit -m "merge file2 (copytrace tracked rename)"
  $ hg merge link
  a/b: path conflict - a file or link has the same name as a directory
  the remote file has been renamed to a/b~2ea68033e3be
  resolve manually then use 'hg resolve --mark a/b'
  1 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]
  $ hg mv a/b~2ea68033e3be a/b.old

#if symlink
  $ readlink.py a/b.old
  a/b.old -> c
#else
  $ cat a/b.old
  c (no-eol)
#endif

  $ hg resolve --mark a/b
  (no more unresolved files)
  $ hg commit -m "merge link (rename link)"