$ cat >> $HGRCPATH <<EOF

  > [extensions]

  > rebase=

  > drawdag=$TESTDIR/drawdag.py

  > [alias]

  > tglog = log -G --template "{rev}: {node|short} '{desc}' {branches}\n"

  > EOF

  $ hg init repo

  $ cd repo

  $ echo A > a

  $ echo >> a

  $ hg ci -Am A

  adding a

  $ echo B > a

  $ echo >> a

  $ hg ci -m B

  $ echo C > a

  $ echo >> a

  $ hg ci -m C

  $ hg up -q -C 0

  $ echo D >> a

  $ hg ci -Am AD

  created new head

  $ hg tglog

  @  3: 3878212183bd 'AD'

  |

  | o  2: 30ae917c0e4f 'C'

  | |

  | o  1: 0f4f7cb4f549 'B'

  |/

  o  0: 1e635d440a73 'A'

  $ hg rebase -s 1 -d 3

  rebasing 1:0f4f7cb4f549 "B"

  merging a

  rebasing 2:30ae917c0e4f "C"

  merging a

  saved backup bundle to $TESTTMP/repo/.hg/strip-backup/0f4f7cb4f549-82b3b163-rebase.hg

  $ hg tglog

  o  3: 25773bc4b4b0 'C'

  |

  o  2: c09015405f75 'B'

  |

  @  1: 3878212183bd 'AD'

  |

  o  0: 1e635d440a73 'A'

  $ cd ..

Test rebasing of merges with ancestors of the rebase destination - a situation

that often happens when trying to recover from repeated merging with a mainline

branch.

The test case creates a dev branch that contains a couple of merges from the

default branch. When rebasing to the default branch, these merges would be

merges with ancestors on the same branch. The merges _could_ contain some

interesting conflict resolutions or additional changes in the merge commit, but

that is mixed up with the actual merge stuff and there is in general no way to

separate them.

  $ hg init ancestor-merge

  $ cd ancestor-merge

  $ touch f-default

  $ hg ci -Aqm 'default: create f-default'

  $ hg branch -q dev

  $ hg ci -qm 'dev: create branch'

  $ echo stuff > f-dev

  $ hg ci -Aqm 'dev: f-dev stuff'

  $ hg up -q default

  $ echo stuff > f-default

  $ hg ci -m 'default: f-default stuff'

  $ hg up -q dev

  $ hg merge -q default

  $ hg ci -m 'dev: merge default'

  $ hg up -q default

  $ hg rm f-default

  $ hg ci -m 'default: remove f-default'

  $ hg up -q dev

  $ hg merge -q default

  $ hg ci -m 'dev: merge default'

  $ hg up -q default

  $ echo stuff > f-other

  $ hg ci -Aqm 'default: f-other stuff'

  $ hg tglog

  @  7: e08089805d82 'default: f-other stuff'

  |

  | o  6: 010ced67e558 'dev: merge default' dev

  |/|

  o |  5: 462860db70a1 'default: remove f-default'

  | |

  | o  4: 4b019212aaf6 'dev: merge default' dev

  |/|

  o |  3: f157ecfd2b6b 'default: f-default stuff'

  | |

  | o  2: ec2c14fb2984 'dev: f-dev stuff' dev

  | |

  | o  1: 1d1a643d390e 'dev: create branch' dev

  |/

  o  0: e90e8eb90b6f 'default: create f-default'

  $ hg clone -qU . ../ancestor-merge-2

Full rebase all the way back from branching point:

  $ hg rebase -r 'only(dev,default)' -d default --config ui.interactive=True << EOF

  > c

  > EOF

  rebasing 1:1d1a643d390e "dev: create branch"

  note: not rebasing 1:1d1a643d390e "dev: create branch", its destination already has all its changes

  rebasing 2:ec2c14fb2984 "dev: f-dev stuff"

  rebasing 4:4b019212aaf6 "dev: merge default"

  note: not rebasing 4:4b019212aaf6 "dev: merge default", its destination already has all its changes

  rebasing 6:010ced67e558 "dev: merge default"

  note: not rebasing 6:010ced67e558 "dev: merge default", its destination already has all its changes

  saved backup bundle to $TESTTMP/ancestor-merge/.hg/strip-backup/1d1a643d390e-4a6f6d17-rebase.hg

  $ hg tglog

  o  4: 3e075b1c0a40 'dev: f-dev stuff'

  |

  @  3: e08089805d82 'default: f-other stuff'

  |

  o  2: 462860db70a1 'default: remove f-default'

  |

  o  1: f157ecfd2b6b 'default: f-default stuff'

  |

  o  0: e90e8eb90b6f 'default: create f-default'

Grafty cherry picking rebasing:

  $ cd ../ancestor-merge-2

  $ hg phase -fdr0:

  $ hg rebase -r 'children(only(dev,default))' -d default --config ui.interactive=True << EOF

  > c

  > EOF

  rebasing 2:ec2c14fb2984 "dev: f-dev stuff"

  rebasing 4:4b019212aaf6 "dev: merge default"

  abort: rebasing 4:4b019212aaf6 will include unwanted changes from 1:1d1a643d390e

  [10]

  $ cd ..

Test order of parents of rebased merged with un-rebased changes as p1.

  $ hg init parentorder

  $ cd parentorder

  $ touch f

  $ hg ci -Aqm common

  $ touch change

  $ hg ci -Aqm change

  $ touch target

  $ hg ci -Aqm target

  $ hg up -qr 0

  $ touch outside

  $ hg ci -Aqm outside

  $ hg merge -qr 1

  $ hg ci -m 'merge p1 3=outside p2 1=ancestor'

  $ hg par

  changeset:   4:6990226659be

  tag:         tip

  parent:      3:f59da8fc0fcf

  parent:      1:dd40c13f7a6f

  user:        test

  date:        Thu Jan 01 00:00:00 1970 +0000

  summary:     merge p1 3=outside p2 1=ancestor

  $ hg up -qr 1

  $ hg merge -qr 3

  $ hg ci -qm 'merge p1 1=ancestor p2 3=outside'

  $ hg par

  changeset:   5:a57575f79074

  tag:         tip

  parent:      1:dd40c13f7a6f

  parent:      3:f59da8fc0fcf

  user:        test

  date:        Thu Jan 01 00:00:00 1970 +0000

  summary:     merge p1 1=ancestor p2 3=outside

  $ hg tglog

  @    5: a57575f79074 'merge p1 1=ancestor p2 3=outside'

  |\

  +---o  4: 6990226659be 'merge p1 3=outside p2 1=ancestor'

  | |/

  | o  3: f59da8fc0fcf 'outside'

  | |

  +---o  2: a60552eb93fb 'target'

  | |

  o |  1: dd40c13f7a6f 'change'

  |/

  o  0: 02f0f58d5300 'common'

  $ hg rebase -r 4 -d 2

  rebasing 4:6990226659be "merge p1 3=outside p2 1=ancestor"

  saved backup bundle to $TESTTMP/parentorder/.hg/strip-backup/6990226659be-4d67a0d3-rebase.hg

  $ hg tip

  changeset:   5:cca50676b1c5

  tag:         tip

  parent:      2:a60552eb93fb

  parent:      3:f59da8fc0fcf

  user:        test

  date:        Thu Jan 01 00:00:00 1970 +0000

  summary:     merge p1 3=outside p2 1=ancestor

  $ hg rebase -r 4 -d 2

  rebasing 4:a57575f79074 "merge p1 1=ancestor p2 3=outside"

  saved backup bundle to $TESTTMP/parentorder/.hg/strip-backup/a57575f79074-385426e5-rebase.hg

  $ hg tip

  changeset:   5:f9daf77ffe76

  tag:         tip

  parent:      2:a60552eb93fb

  parent:      3:f59da8fc0fcf

  user:        test

  date:        Thu Jan 01 00:00:00 1970 +0000

  summary:     merge p1 1=ancestor p2 3=outside

  $ hg tglog

  @    5: f9daf77ffe76 'merge p1 1=ancestor p2 3=outside'

  |\

  +---o  4: cca50676b1c5 'merge p1 3=outside p2 1=ancestor'

  | |/

  | o  3: f59da8fc0fcf 'outside'

  | |

  o |  2: a60552eb93fb 'target'

  | |

  o |  1: dd40c13f7a6f 'change'

  |/

  o  0: 02f0f58d5300 'common'

rebase of merge of ancestors

  $ hg up -qr 2

  $ hg merge -qr 3

  $ echo 'other change while merging future "rebase ancestors"' > other

  $ hg ci -Aqm 'merge rebase ancestors'

  $ hg rebase -d 5 -v

  rebasing 6:4c5f12f25ebe tip "merge rebase ancestors"

  resolving manifests

  removing other

  resolving manifests

  getting other

  committing files:

  other

  committing manifest

  committing changelog

  rebase merging completed

  1 changesets found

  uncompressed size of bundle content:

       199 (changelog)

       216 (manifests)

       182  other

  saved backup bundle to $TESTTMP/parentorder/.hg/strip-backup/4c5f12f25ebe-f46990e5-rebase.hg

  1 changesets found

  uncompressed size of bundle content:

       254 (changelog)

       167 (manifests)

       182  other

  adding branch

  adding changesets

  adding manifests

  adding file changes

  added 1 changesets with 1 changes to 1 files

  rebase completed

  $ hg tglog

  @  6: 113755df812b 'merge rebase ancestors'

  |

  o    5: f9daf77ffe76 'merge p1 1=ancestor p2 3=outside'

  |\

  +---o  4: cca50676b1c5 'merge p1 3=outside p2 1=ancestor'

  | |/

  | o  3: f59da8fc0fcf 'outside'

  | |

  o |  2: a60552eb93fb 'target'

  | |

  o |  1: dd40c13f7a6f 'change'

  |/

  o  0: 02f0f58d5300 'common'

Due to the limitation of 3-way merge algorithm (1 merge base), rebasing a merge

may include unwanted content:

  $ hg init $TESTTMP/dual-merge-base1

  $ cd $TESTTMP/dual-merge-base1

  $ hg debugdrawdag <<'EOS'

  >   F

  >  /|

  > D E

  > | |

  > B C

  > |/

  > A Z

  > |/

  > R

  > EOS

  $ hg rebase -r D+E+F -d Z

  rebasing 5:5f2c926dfecf D "D"

  rebasing 6:b296604d9846 E "E"

  rebasing 7:caa9781e507d F tip "F"

  abort: rebasing 7:caa9781e507d will include unwanted changes from 4:d6003a550c2c or 3:c1e6b162678d

  [10]

The warning does not get printed if there is no unwanted change detected:

  $ hg init $TESTTMP/dual-merge-base2

  $ cd $TESTTMP/dual-merge-base2

  $ hg debugdrawdag <<'EOS'

  >   D

  >  /|

  > B C

  > |/

  > A Z

  > |/

  > R

  > EOS

  $ hg rebase -r B+C+D -d Z

  rebasing 3:c1e6b162678d B "B"

  rebasing 4:d6003a550c2c C "C"

  rebasing 5:c8f78076273e D tip "D"

  saved backup bundle to $TESTTMP/dual-merge-base2/.hg/strip-backup/d6003a550c2c-6f1424b6-rebase.hg

  $ hg manifest -r 'desc(D)'

  B

  C

  R

  Z

The merge base could be different from old p1 (changed parent becomes new p1):

  $ hg init $TESTTMP/chosen-merge-base1

  $ cd $TESTTMP/chosen-merge-base1

  $ hg debugdrawdag <<'EOS'

  >   F

  >  /|

  > D E

  > | |

  > B C Z

  > EOS

  $ hg rebase -r D+F -d Z

  rebasing 3:004dc1679908 D "D"

  rebasing 5:4be4cbf6f206 F tip "F"

  saved backup bundle to $TESTTMP/chosen-merge-base1/.hg/strip-backup/004dc1679908-06a66a3c-rebase.hg

  $ hg manifest -r 'desc(F)'

  C

  D

  E

  Z

  $ hg log -r `hg log -r 'desc(F)' -T '{p1node}'` -T '{desc}\n'

  D

  $ hg init $TESTTMP/chosen-merge-base2

  $ cd $TESTTMP/chosen-merge-base2

  $ hg debugdrawdag <<'EOS'

  >   F

  >  /|

  > D E

  > | |

  > B C Z

  > EOS

  $ hg rebase -r E+F -d Z