view tests/test-rebase-inmemory.t @ 42619:20d0e59be79b

tests: show the files fields of changelogs for many merges

I don't think there's coverage for many of the subtle cases, and I
found it hard to understand what the code is doing by reading it.  The
test takes 40s to run on a laptop, or 9s with --chg.

I have yet to find a description of what the files field is supposed
to be for merges. I thought it could be one of:
1. the files added/modified/removed relative to p1 (wouldn't seem
  useful, but `hg diff -c -r mergerev` has this behavior)
2. the files with filelog nodes not in either parent (i.e., what is
needed to create a bundle out of a commit)
3. the files added/removed/modified files by merge itself [1]

It's clearly not 1, because file contents merges are symmetric. It's
clearly not 2 because removed files and exec bit changes are
listed. It's also not 3 but I think it's intended to be 3 and the
differences are bugs.

Assuming 3, the test shows that, for merges, the list of files both
overapproximates and underapproximates. All the cases involve file
changes not in the filelog but in the manifest (existence of file
at revision, exec bit and file vs symlink).

I didn't look at all underapproximations, but they looked minor. The
two overapproximations are problematic though because they both cause
potentially long lists of files when merging cleanly.


[1] even what it means for the merge commit itself to change a file is
not completely trivial. A file in the merge being the same as in one
of the parent is too lax as it would consider that merges change
nothing when they revert all the changes done on one side. The
criteria used in the test and in the next commit for "merge didn't
touch a file" is:
- the parents and the merge all have the same file
- or, one parent didn't touch the file and the other parent contains
  the same file as the merge

Differential Revision: https://phab.mercurial-scm.org/D6612

#require symlink execbit
  $ cat << EOF >> $HGRCPATH
  > [phases]
  > publish=False
  > [extensions]
  > amend=
  > rebase=
  > debugdrawdag=$TESTDIR/drawdag.py
  > strip=
  > [rebase]
  > experimental.inmemory=1
  > [diff]
  > git=1
  > [alias]
  > tglog = log -G --template "{rev}: {node|short} '{desc}'\n"
  > EOF

Rebase a simple DAG:
  $ hg init repo1
  $ cd repo1
  $ hg debugdrawdag <<'EOS'
  > c b
  > |/
  > d
  > |
  > a
  > EOS
  $ hg up -C a
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg tglog
  o  3: 814f6bd05178 'c'
  |
  | o  2: db0e82a16a62 'b'
  |/
  o  1: 02952614a83d 'd'
  |
  @  0: b173517d0057 'a'
  
  $ hg cat -r 3 c
  c (no-eol)
  $ hg cat -r 2 b
  b (no-eol)
  $ hg rebase --debug -r b -d c | grep rebasing
  rebasing in-memory
  rebasing 2:db0e82a16a62 "b" (b)
  $ hg tglog
  o  3: ca58782ad1e4 'b'
  |
  o  2: 814f6bd05178 'c'
  |
  o  1: 02952614a83d 'd'
  |
  @  0: b173517d0057 'a'
  
  $ hg cat -r 3 b
  b (no-eol)
  $ hg cat -r 2 c
  c (no-eol)
  $ cd ..

Case 2:
  $ hg init repo2
  $ cd repo2
  $ hg debugdrawdag <<'EOS'
  > c b
  > |/
  > d
  > |
  > a
  > EOS

Add a symlink and executable file:
  $ hg up -C c
  3 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ ln -s somefile e
  $ echo f > f
  $ chmod +x f
  $ hg add e f
  $ hg amend -q
  $ hg up -Cq a

Write files to the working copy, and ensure they're still there after the rebase
  $ echo "abc" > a
  $ ln -s def b
  $ echo "ghi" > c
  $ echo "jkl" > d
  $ echo "mno" > e
  $ hg tglog
  o  3: f56b71190a8f 'c'
  |
  | o  2: db0e82a16a62 'b'
  |/
  o  1: 02952614a83d 'd'
  |
  @  0: b173517d0057 'a'
  
  $ hg cat -r 3 c
  c (no-eol)
  $ hg cat -r 2 b
  b (no-eol)
  $ hg cat -r 3 e
  somefile (no-eol)
  $ hg rebase --debug -s b -d a | grep rebasing
  rebasing in-memory
  rebasing 2:db0e82a16a62 "b" (b)
  $ hg tglog
  o  3: fc055c3b4d33 'b'
  |
  | o  2: f56b71190a8f 'c'
  | |
  | o  1: 02952614a83d 'd'
  |/
  @  0: b173517d0057 'a'
  
  $ hg cat -r 2 c
  c (no-eol)
  $ hg cat -r 3 b
  b (no-eol)
  $ hg rebase --debug -s 1 -d 3 | grep rebasing
  rebasing in-memory
  rebasing 1:02952614a83d "d" (d)
  rebasing 2:f56b71190a8f "c"
  $ hg tglog
  o  3: 753feb6fd12a 'c'
  |
  o  2: 09c044d2cb43 'd'
  |
  o  1: fc055c3b4d33 'b'
  |
  @  0: b173517d0057 'a'
  
Ensure working copy files are still there:
  $ cat a
  abc
  $ readlink.py b
  b -> def
  $ cat e
  mno

Ensure symlink and executable files were rebased properly:
  $ hg up -Cq 3
  $ readlink.py e
  e -> somefile
  $ ls -l f | cut -c -10
  -rwxr-xr-x

Rebase the working copy parent
  $ hg up -C 3
  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg rebase -r 3 -d 0 --debug | grep rebasing
  rebasing in-memory
  rebasing 3:753feb6fd12a "c" (tip)
  $ hg tglog
  @  3: 844a7de3e617 'c'
  |
  | o  2: 09c044d2cb43 'd'
  | |
  | o  1: fc055c3b4d33 'b'
  |/
  o  0: b173517d0057 'a'
  

Test reporting of path conflicts

  $ hg rm a
  $ mkdir a
  $ touch a/a
  $ hg ci -Am "a/a"
  adding a/a
  $ hg tglog
  @  4: daf7dfc139cb 'a/a'
  |
  o  3: 844a7de3e617 'c'
  |
  | o  2: 09c044d2cb43 'd'
  | |
  | o  1: fc055c3b4d33 'b'
  |/
  o  0: b173517d0057 'a'
  
  $ hg rebase -r . -d 2
  rebasing 4:daf7dfc139cb "a/a" (tip)
  saved backup bundle to $TESTTMP/repo2/.hg/strip-backup/daf7dfc139cb-fdbfcf4f-rebase.hg

  $ hg tglog
  @  4: c6ad37a4f250 'a/a'
  |
  | o  3: 844a7de3e617 'c'
  | |
  o |  2: 09c044d2cb43 'd'
  | |
  o |  1: fc055c3b4d33 'b'
  |/
  o  0: b173517d0057 'a'
  
  $ echo foo > foo
  $ hg ci -Aqm "added foo"
  $ hg up '.^'
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ echo bar > bar
  $ hg ci -Aqm "added bar"
  $ hg rm a/a
  $ echo a > a
  $ hg ci -Aqm "added a back!"
  $ hg tglog
  @  7: 855e9797387e 'added a back!'
  |
  o  6: d14530e5e3e6 'added bar'
  |
  | o  5: 9b94b9373deb 'added foo'
  |/
  o  4: c6ad37a4f250 'a/a'
  |
  | o  3: 844a7de3e617 'c'
  | |
  o |  2: 09c044d2cb43 'd'
  | |
  o |  1: fc055c3b4d33 'b'
  |/
  o  0: b173517d0057 'a'
  
  $ hg rebase -r . -d 5
  rebasing 7:855e9797387e "added a back!" (tip)
  saved backup bundle to $TESTTMP/repo2/.hg/strip-backup/855e9797387e-81ee4c5d-rebase.hg

  $ hg tglog
  @  7: bb3f02be2688 'added a back!'
  |
  | o  6: d14530e5e3e6 'added bar'
  | |
  o |  5: 9b94b9373deb 'added foo'
  |/
  o  4: c6ad37a4f250 'a/a'
  |
  | o  3: 844a7de3e617 'c'
  | |
  o |  2: 09c044d2cb43 'd'
  | |
  o |  1: fc055c3b4d33 'b'
  |/
  o  0: b173517d0057 'a'
  
  $ mkdir -p c/subdir
  $ echo c > c/subdir/file.txt
  $ hg add c/subdir/file.txt
  $ hg ci -m 'c/subdir/file.txt'
  $ hg rebase -r . -d 3 -n
  starting dry-run rebase; repository will not be changed
  rebasing 8:e147e6e3c490 "c/subdir/file.txt" (tip)
  abort: error: 'c/subdir/file.txt' conflicts with file 'c' in 3.
  [255]
  $ hg rebase -r 3 -d . -n
  starting dry-run rebase; repository will not be changed
  rebasing 3:844a7de3e617 "c"
  abort: error: file 'c' cannot be written because  'c/' is a directory in e147e6e3c490 (containing 1 entries: c/subdir/file.txt)
  [255]

  $ cd ..

Test path auditing (issue5818)

  $ mkdir lib_
  $ ln -s lib_ lib
  $ hg init repo
  $ cd repo
  $ mkdir -p ".$TESTTMP/lib"
  $ touch ".$TESTTMP/lib/a"
  $ hg add ".$TESTTMP/lib/a"
  $ hg ci -m 'a'

  $ touch ".$TESTTMP/lib/b"
  $ hg add ".$TESTTMP/lib/b"
  $ hg ci -m 'b'

  $ hg up -q '.^'
  $ touch ".$TESTTMP/lib/c"
  $ hg add ".$TESTTMP/lib/c"
  $ hg ci -m 'c'
  created new head
  $ hg rebase -s 1 -d .
  rebasing 1:* "b" (glob)
  saved backup bundle to $TESTTMP/repo/.hg/strip-backup/*-rebase.hg (glob)
  $ cd ..

Test dry-run rebasing

  $ hg init repo3
  $ cd repo3
  $ echo a>a
  $ hg ci -Aqma
  $ echo b>b
  $ hg ci -Aqmb
  $ echo c>c
  $ hg ci -Aqmc
  $ echo d>d
  $ hg ci -Aqmd
  $ echo e>e
  $ hg ci -Aqme

  $ hg up 1 -q
  $ echo f>f
  $ hg ci -Amf
  adding f
  created new head
  $ echo g>g
  $ hg ci -Aqmg
  $ hg log -G --template "{rev}:{short(node)} {person(author)}\n{firstline(desc)} {topic}\n\n"
  @  6:baf10c5166d4 test
  |  g
  |
  o  5:6343ca3eff20 test
  |  f
  |
  | o  4:e860deea161a test
  | |  e
  | |
  | o  3:055a42cdd887 test
  | |  d
  | |
  | o  2:177f92b77385 test
  |/   c
  |
  o  1:d2ae7f538514 test
  |  b
  |
  o  0:cb9a9f314b8b test
     a
  
Make sure it throws error while passing --continue or --abort with --dry-run
  $ hg rebase -s 2 -d 6 -n --continue
  abort: cannot specify both --dry-run and --continue
  [255]
  $ hg rebase -s 2 -d 6 -n --abort
  abort: cannot specify both --dry-run and --abort
  [255]

Check dryrun gives correct results when there is no conflict in rebasing
  $ hg rebase -s 2 -d 6 -n
  starting dry-run rebase; repository will not be changed
  rebasing 2:177f92b77385 "c"
  rebasing 3:055a42cdd887 "d"
  rebasing 4:e860deea161a "e"
  dry-run rebase completed successfully; run without -n/--dry-run to perform this rebase

  $ hg diff
  $ hg status

  $ hg log -G --template "{rev}:{short(node)} {person(author)}\n{firstline(desc)} {topic}\n\n"
  @  6:baf10c5166d4 test
  |  g
  |
  o  5:6343ca3eff20 test
  |  f
  |
  | o  4:e860deea161a test
  | |  e
  | |
  | o  3:055a42cdd887 test
  | |  d
  | |
  | o  2:177f92b77385 test
  |/   c
  |
  o  1:d2ae7f538514 test
  |  b
  |
  o  0:cb9a9f314b8b test
     a
  
Check dryrun working with --collapse when there is no conflict
  $ hg rebase -s 2 -d 6 -n --collapse
  starting dry-run rebase; repository will not be changed
  rebasing 2:177f92b77385 "c"
  rebasing 3:055a42cdd887 "d"
  rebasing 4:e860deea161a "e"
  dry-run rebase completed successfully; run without -n/--dry-run to perform this rebase

Check dryrun gives correct results when there is conflict in rebasing
Make a conflict:
  $ hg up 6 -q
  $ echo conflict>e
  $ hg ci -Aqm "conflict with e"
  $ hg log -G --template "{rev}:{short(node)} {person(author)}\n{firstline(desc)} {topic}\n\n"
  @  7:d2c195b28050 test
  |  conflict with e
  |
  o  6:baf10c5166d4 test
  |  g
  |
  o  5:6343ca3eff20 test
  |  f
  |
  | o  4:e860deea161a test
  | |  e
  | |
  | o  3:055a42cdd887 test
  | |  d
  | |
  | o  2:177f92b77385 test
  |/   c
  |
  o  1:d2ae7f538514 test
  |  b
  |
  o  0:cb9a9f314b8b test
     a
  
  $ hg rebase -s 2 -d 7 -n
  starting dry-run rebase; repository will not be changed
  rebasing 2:177f92b77385 "c"
  rebasing 3:055a42cdd887 "d"
  rebasing 4:e860deea161a "e"
  merging e
  transaction abort!
  rollback completed
  hit a merge conflict
  [1]
  $ hg diff
  $ hg status
  $ hg log -G --template "{rev}:{short(node)} {person(author)}\n{firstline(desc)} {topic}\n\n"
  @  7:d2c195b28050 test
  |  conflict with e
  |
  o  6:baf10c5166d4 test
  |  g
  |
  o  5:6343ca3eff20 test
  |  f
  |
  | o  4:e860deea161a test
  | |  e
  | |
  | o  3:055a42cdd887 test
  | |  d
  | |
  | o  2:177f92b77385 test
  |/   c
  |
  o  1:d2ae7f538514 test
  |  b
  |
  o  0:cb9a9f314b8b test
     a
  
Check dryrun working with --collapse when there is conflicts
  $ hg rebase -s 2 -d 7 -n --collapse
  starting dry-run rebase; repository will not be changed
  rebasing 2:177f92b77385 "c"
  rebasing 3:055a42cdd887 "d"
  rebasing 4:e860deea161a "e"
  merging e
  hit a merge conflict
  [1]

In-memory rebase that fails due to merge conflicts

  $ hg rebase -s 2 -d 7
  rebasing 2:177f92b77385 "c"
  rebasing 3:055a42cdd887 "d"
  rebasing 4:e860deea161a "e"
  merging e
  transaction abort!
  rollback completed
  hit merge conflicts; re-running rebase without in-memory merge
  rebasing 2:177f92b77385 "c"
  rebasing 3:055a42cdd887 "d"
  rebasing 4:e860deea161a "e"
  merging e
  warning: conflicts while merging e! (edit, then use 'hg resolve --mark')
  unresolved conflicts (see hg resolve, then hg rebase --continue)
  [1]
  $ hg rebase --abort
  saved backup bundle to $TESTTMP/repo3/.hg/strip-backup/c1e524d4287c-f91f82e1-backup.hg
  rebase aborted

Retrying without in-memory merge won't lose working copy changes
  $ cd ..
  $ hg clone repo3 repo3-dirty -q
  $ cd repo3-dirty
  $ echo dirty > a
  $ hg rebase -s 2 -d 7
  rebasing 2:177f92b77385 "c"
  rebasing 3:055a42cdd887 "d"
  rebasing 4:e860deea161a "e"
  merging e
  transaction abort!
  rollback completed
  hit merge conflicts; re-running rebase without in-memory merge
  abort: uncommitted changes
  [255]
  $ cat a
  dirty

Retrying without in-memory merge won't lose merge state
  $ cd ..
  $ hg clone repo3 repo3-merge-state -q
  $ cd repo3-merge-state
  $ hg merge 4
  merging e
  warning: conflicts while merging e! (edit, then use 'hg resolve --mark')
  2 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 resolve -l
  U e
  $ hg rebase -s 2 -d 7
  rebasing 2:177f92b77385 "c"
  abort: outstanding merge conflicts
  [255]
  $ hg resolve -l
  U e

==========================
Test for --confirm option|
==========================
  $ cd ..
  $ hg clone repo3 repo4 -q
  $ cd repo4
  $ hg strip 7 -q
  $ hg log -G --template "{rev}:{short(node)} {person(author)}\n{firstline(desc)} {topic}\n\n"
  @  6:baf10c5166d4 test
  |  g
  |
  o  5:6343ca3eff20 test
  |  f
  |
  | o  4:e860deea161a test
  | |  e
  | |
  | o  3:055a42cdd887 test
  | |  d
  | |
  | o  2:177f92b77385 test
  |/   c
  |
  o  1:d2ae7f538514 test
  |  b
  |
  o  0:cb9a9f314b8b test
     a
  
Check it gives error when both --dryrun and --confirm is used:
  $ hg rebase -s 2 -d . --confirm --dry-run
  abort: cannot specify both --confirm and --dry-run
  [255]
  $ hg rebase -s 2 -d . --confirm --abort
  abort: cannot specify both --confirm and --abort
  [255]
  $ hg rebase -s 2 -d . --confirm --continue
  abort: cannot specify both --confirm and --continue
  [255]

Test --confirm option when there are no conflicts:
  $ hg rebase -s 2 -d . --keep --config ui.interactive=True --confirm << EOF
  > n
  > EOF
  starting in-memory rebase
  rebasing 2:177f92b77385 "c"
  rebasing 3:055a42cdd887 "d"
  rebasing 4:e860deea161a "e"
  rebase completed successfully
  apply changes (yn)? n
  $ hg log -G --template "{rev}:{short(node)} {person(author)}\n{firstline(desc)} {topic}\n\n"
  @  6:baf10c5166d4 test
  |  g
  |
  o  5:6343ca3eff20 test
  |  f
  |
  | o  4:e860deea161a test
  | |  e
  | |
  | o  3:055a42cdd887 test
  | |  d
  | |
  | o  2:177f92b77385 test
  |/   c
  |
  o  1:d2ae7f538514 test
  |  b
  |
  o  0:cb9a9f314b8b test
     a
  
  $ hg rebase -s 2 -d . --keep --config ui.interactive=True --confirm << EOF
  > y
  > EOF
  starting in-memory rebase
  rebasing 2:177f92b77385 "c"
  rebasing 3:055a42cdd887 "d"
  rebasing 4:e860deea161a "e"
  rebase completed successfully
  apply changes (yn)? y
  $ hg log -G --template "{rev}:{short(node)} {person(author)}\n{firstline(desc)} {topic}\n\n"
  o  9:9fd28f55f6dc test
  |  e
  |
  o  8:12cbf031f469 test
  |  d
  |
  o  7:c83b1da5b1ae test
  |  c
  |
  @  6:baf10c5166d4 test
  |  g
  |
  o  5:6343ca3eff20 test
  |  f
  |
  | o  4:e860deea161a test
  | |  e
  | |
  | o  3:055a42cdd887 test
  | |  d
  | |
  | o  2:177f92b77385 test
  |/   c
  |
  o  1:d2ae7f538514 test
  |  b
  |
  o  0:cb9a9f314b8b test
     a
  
Test --confirm option when there is a conflict
  $ hg up tip -q
  $ echo ee>e
  $ hg ci --amend -m "conflict with e" -q
  $ hg log -G --template "{rev}:{short(node)} {person(author)}\n{firstline(desc)} {topic}\n\n"
  @  9:906d72f66a59 test
  |  conflict with e
  |
  o  8:12cbf031f469 test
  |  d
  |
  o  7:c83b1da5b1ae test
  |  c
  |
  o  6:baf10c5166d4 test
  |  g
  |
  o  5:6343ca3eff20 test
  |  f
  |
  | o  4:e860deea161a test
  | |  e
  | |
  | o  3:055a42cdd887 test
  | |  d
  | |
  | o  2:177f92b77385 test
  |/   c
  |
  o  1:d2ae7f538514 test
  |  b
  |
  o  0:cb9a9f314b8b test
     a
  
  $ hg rebase -s 4 -d . --keep --confirm
  starting in-memory rebase
  rebasing 4:e860deea161a "e"
  merging e
  hit a merge conflict
  [1]
  $ hg log -G --template "{rev}:{short(node)} {person(author)}\n{firstline(desc)} {topic}\n\n"
  @  9:906d72f66a59 test
  |  conflict with e
  |
  o  8:12cbf031f469 test
  |  d
  |
  o  7:c83b1da5b1ae test
  |  c
  |
  o  6:baf10c5166d4 test
  |  g
  |
  o  5:6343ca3eff20 test
  |  f
  |
  | o  4:e860deea161a test
  | |  e
  | |
  | o  3:055a42cdd887 test
  | |  d
  | |
  | o  2:177f92b77385 test
  |/   c
  |
  o  1:d2ae7f538514 test
  |  b
  |
  o  0:cb9a9f314b8b test
     a
  
Test a metadata-only in-memory merge
  $ cd $TESTTMP
  $ hg init no_exception
  $ cd no_exception
# Produce the following graph:
#   o  'add +x to foo.txt'
#   | o  r1  (adds bar.txt, just for something to rebase to)
#   |/
#   o  r0   (adds foo.txt, no +x)
  $ echo hi > foo.txt
  $ hg ci -qAm r0
  $ echo hi > bar.txt
  $ hg ci -qAm r1
  $ hg co -qr ".^"
  $ chmod +x foo.txt
  $ hg ci -qAm 'add +x to foo.txt'
issue5960: this was raising an AttributeError exception
  $ hg rebase -r . -d 1
  rebasing 2:539b93e77479 "add +x to foo.txt" (tip)
  saved backup bundle to $TESTTMP/no_exception/.hg/strip-backup/*.hg (glob)
  $ hg diff -c tip
  diff --git a/foo.txt b/foo.txt
  old mode 100644
  new mode 100755

Test rebasing a commit with copy information, but no content changes

  $ cd ..
  $ hg clone -q repo1 merge-and-rename
  $ cd merge-and-rename
  $ cat << EOF >> .hg/hgrc
  > [experimental]
  > evolution.createmarkers=True
  > evolution.allowunstable=True
  > EOF
  $ hg co -q 1
  $ hg mv d e
  $ hg ci -qm 'rename d to e'
  $ hg co -q 3
  $ hg merge -q 4
  $ hg ci -m 'merge'
  $ hg co -q 2
  $ mv d e
  $ hg addremove -qs 0
  $ hg ci -qm 'untracked rename of d to e'
  $ hg debugobsolete -q `hg log -T '{node}' -r 4` `hg log -T '{node}' -r .`
  1 new orphan changesets
  $ hg tglog
  @  6: 676538af172d 'untracked rename of d to e'
  |
  | *    5: 71cb43376053 'merge'
  | |\
  | | x  4: 2c8b5dad7956 'rename d to e'
  | | |
  | o |  3: ca58782ad1e4 'b'
  |/ /
  o /  2: 814f6bd05178 'c'
  |/
  o  1: 02952614a83d 'd'
  |
  o  0: b173517d0057 'a'
  
  $ hg rebase -b 5 -d tip
  rebasing 3:ca58782ad1e4 "b"
  rebasing 5:71cb43376053 "merge"
  note: not rebasing 5:71cb43376053 "merge", its destination already has all its changes

  $ cd ..

Test rebasing a commit with copy information

  $ hg init rebase-rename
  $ cd rebase-rename
  $ echo a > a
  $ hg ci -Aqm 'add a'
  $ echo a2 > a
  $ hg ci -m 'modify a'
  $ hg co -q 0
  $ hg mv a b
  $ hg ci -qm 'rename a to b'
  $ hg rebase -d 1
  rebasing 2:b977edf6f839 "rename a to b" (tip)
  merging a and b to b
  saved backup bundle to $TESTTMP/rebase-rename/.hg/strip-backup/b977edf6f839-0864f570-rebase.hg
  $ hg st --copies --change .
  A b
    a
  R a
  $ cd ..

Test rebasing a commit with copy information, where the target is empty

  $ hg init rebase-rename-empty
  $ cd rebase-rename-empty
  $ echo a > a
  $ hg ci -Aqm 'add a'
  $ cat > a
  $ hg ci -m 'make a empty'
  $ hg co -q 0
  $ hg mv a b
  $ hg ci -qm 'rename a to b'
  $ hg rebase -d 1
  rebasing 2:b977edf6f839 "rename a to b" (tip)
  merging a and b to b
  saved backup bundle to $TESTTMP/rebase-rename-empty/.hg/strip-backup/b977edf6f839-0864f570-rebase.hg
  $ hg st --copies --change .
  A b
    a
  R a
  $ cd ..
Rebase across a copy with --collapse

  $ hg init rebase-rename-collapse
  $ cd rebase-rename-collapse
  $ echo a > a
  $ hg ci -Aqm 'add a'
  $ hg mv a b
  $ hg ci -m 'rename a to b'
  $ hg co -q 0
  $ echo a2 > a
  $ hg ci -qm 'modify a'
  $ hg rebase -r . -d 1 --collapse
  rebasing 2:41c4ea50d4cf "modify a" (tip)
  merging b and a to b
  saved backup bundle to $TESTTMP/rebase-rename-collapse/.hg/strip-backup/41c4ea50d4cf-b90b7994-rebase.hg
  $ cd ..

Test rebasing when the file we are merging in destination is empty

  $ hg init test
  $ cd test
  $ echo a > foo
  $ hg ci -Aqm 'added a to foo'

  $ rm foo
  $ touch foo
  $ hg di
  diff --git a/foo b/foo
  --- a/foo
  +++ b/foo
  @@ -1,1 +0,0 @@
  -a

  $ hg ci -m "make foo an empty file"

  $ hg up '.^'
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ echo b > foo
  $ hg di
  diff --git a/foo b/foo
  --- a/foo
  +++ b/foo
  @@ -1,1 +1,1 @@
  -a
  +b
  $ hg ci -m "add b to foo"
  created new head

  $ hg rebase -r . -d 1 --config ui.merge=internal:merge3
  rebasing 2:fb62b706688e "add b to foo" (tip)
  merging foo
  hit merge conflicts; re-running rebase without in-memory merge
  rebasing 2:fb62b706688e "add b to foo" (tip)
  merging foo
  warning: conflicts while merging foo! (edit, then use 'hg resolve --mark')
  unresolved conflicts (see hg resolve, then hg rebase --continue)
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