view tests/test-rebase-inmemory.t @ 43198:c16fe77e340a

pathcopies: give up any optimization based on `introrev`

Between 8a0136f69027 and d98fb3f42f33, we sped up the search for the
introduction revision during path copies. However, further checking show that
finding the introduction revision is still expensive and that we are better off
without it. So we simply drop it and only rely on the linkrev optimisation.

I ran `perfpathcopies` on 6989 pair of revision in the pypy
repository (`hg perfhelper-pathcopies`. The result is massively in favor of
dropping this condition. The result of the copy tracing are unchanged.

Attempt to use a smaller changes preserving linkrev usage were unsuccessful, it
can return wrong result. The following changesets broke test-mv-cp-st-diff.t

    -        if not f.isintroducedafter(limit):
    +        if limit >= 0 and f.linkrev() < limit:
                 return None


Here are various numbers (before this changeset/after this changesets)

            source       destination  before      after    saved-time  ratio
worth cases e66f24650daf 695dfb0f493b 1.062843 1.246369 -0.183526 1.172675
            c979853a3b6a 8d60fe293e79 1.036985 1.196414 -0.159429 1.153743
            22349fa2fc33 fbb1c9fd86c0 0.879926 1.038682 -0.158756 1.180420
            682b98f3e672 a4878080a536 0.909952 1.063801 -0.153849 1.169074
            5adabc9b9848 920958a93997 0.993622 1.147452 -0.153830 1.154817
worse  1%   dbfbfcf077e9 aea8f2fd3593 1.016595 1.082999 -0.066404 1.065320
worse  5%   c95f1ced15f2 7d29d5e39734 0.453694 0.471156 -0.017462 1.038488
worse 10%   3e144ed1d5b7 2aef0e942480 0.035140 0.037535 -0.002395 1.068156
worse 25%   321fc60db035 801748ba582a 0.009267 0.009325 -0.000058 1.006259
median      2088ce763fc2 e6991321d78b 0.000665 0.000651 0.000014 0.978947
best 25%    915631a97de6 385b31354be6 0.040743 0.040363 0.000380 0.990673
best 10%    ad495c36a765 19c10384d3e7 0.431658 0.411490 0.020168 0.953278
best  5%    d13ae7d283ae 813c99f810ac 1.141404 1.075346 0.066058 0.942126
best  1%    81593cb4a496 99ae11866969 1.833297 0.063823 1.769474 0.034813
best cases  c3b14617fbd7 743a0fcaa4eb 1101.811740 2.735970 1099.075770 0.002483
            c3b14617fbd7 9ba6ab77fd29 1116.753953 2.800729 1113.953224 0.002508
            058b99d6e81f 57e249b7a3ea 1246.128485 3.042762 1243.085723 0.002442
            9a8c361aab49 0354a250d371 1253.111894 3.085796 1250.026098 0.002463
            442dbbc53c68 3ec1002a818c 1261.786294 3.138607 1258.647687 0.002487


As one can see, the average case is not really impacted. However, the worth case
we get after this changeset are much better than the one we had before it. We
have 30 pairs where improvements are above 10 minutes.

This reflect in the combined time for all pairs
before: 26256s
after:   1300s (-95%)

If we remove these pathological 30 cases, we still see a significant improvements:
before:  1631s
after:   1245s (-24%)

#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
  (use 'hg resolve' to resolve)
  [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: 574d92ad16fc '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 5:574d92ad16fc "merge"
  note: not rebasing 5:574d92ad16fc "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)
  [1]