Orphan changeset and trying to relocate a node on top of itself (issue6097)

https://bz.mercurial-scm.org/show_bug.cgi?id=6097

  $ . $TESTDIR/testlib/common.sh

  $ cat << EOF >> $HGRCPATH

  > [extensions]

  > rebase =

  > evolve =

  > EOF

  $ hg init issue6097

  $ cd issue6097

  $ echo apricot > a

  $ hg ci -qAm apricot

  $ echo banana > b

  $ hg ci -qAm banana

Let's go back to amend 0 and make an orphan out of 1

  $ hg up -q 0

  $ echo coconut > c

  $ hg add -q c

  $ hg ci --amend -m 'apricot and coconut'

  1 new orphan changesets

Now rebase the successor of 0 on top of 1

  $ hg rebase -r . -d 1

  rebasing 2:32acf8fb1b23 "apricot and coconut" (tip)

  1 new orphan changesets

Pruning 1 just to get it out of the way

  $ hg prune -q 1

Note how both the regular DAG and the obsolescence graph are linear, but the

paths from 3 to 0 are different: 3-1-0 and 3-2-0

  $ hg log -G

  @  changeset:   3:2868fe6df617

  |  tag:         tip

  |  parent:      1:e0486f65907d

  |  user:        test

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

  |  instability: orphan

  |  summary:     apricot and coconut

  |

  x  changeset:   1:e0486f65907d

  |  user:        test

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

  |  obsolete:    pruned using prune

  |  summary:     banana

  |

  x  changeset:   0:692cc7b6212c

     user:        test

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

     obsolete:    rewritten using amend, rebase as 3:2868fe6df617

     summary:     apricot

  $ hg debugobsolete

  692cc7b6212c102a9eafcf04ed2e4bfca5023754 32acf8fb1b2325c727135dcd65153745a031a125 0 (Thu Jan 01 00:00:00 1970 +0000) {'ef1': '9', 'operation': 'amend', 'user': 'test'}

  32acf8fb1b2325c727135dcd65153745a031a125 2868fe6df617a3045cf668e4ab1c486a8692abd1 0 (Thu Jan 01 00:00:00 1970 +0000) {'ef1': '12', 'operation': 'rebase', 'user': 'test'}

  e0486f65907dac7107e72a247386845e6a9fd83b 0 {692cc7b6212c102a9eafcf04ed2e4bfca5023754} (Thu Jan 01 00:00:00 1970 +0000) {'ef1': '0', 'operation': 'prune', 'user': 'test'}

  $ hg obslog

  @  2868fe6df617 (3) apricot and coconut

  |

  x  32acf8fb1b23 (2) apricot and coconut

  |

  x  692cc7b6212c (0) apricot

  $ hg evolve -r .

  move:[3] apricot and coconut

  atop:[-1] 

  working directory is now at bb847d1d3a5f

  $ hg log -G

  @  changeset:   4:bb847d1d3a5f

     tag:         tip

     parent:      -1:000000000000

     user:        test

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

     summary:     apricot and coconut

  $ hg debugobsolete

  692cc7b6212c102a9eafcf04ed2e4bfca5023754 32acf8fb1b2325c727135dcd65153745a031a125 0 (Thu Jan 01 00:00:00 1970 +0000) {'ef1': '9', 'operation': 'amend', 'user': 'test'}

  32acf8fb1b2325c727135dcd65153745a031a125 2868fe6df617a3045cf668e4ab1c486a8692abd1 0 (Thu Jan 01 00:00:00 1970 +0000) {'ef1': '12', 'operation': 'rebase', 'user': 'test'}

  e0486f65907dac7107e72a247386845e6a9fd83b 0 {692cc7b6212c102a9eafcf04ed2e4bfca5023754} (Thu Jan 01 00:00:00 1970 +0000) {'ef1': '0', 'operation': 'prune', 'user': 'test'}

  2868fe6df617a3045cf668e4ab1c486a8692abd1 bb847d1d3a5f3de90f4fd5e845b69d848568401a 0 (Thu Jan 01 00:00:00 1970 +0000) {'ef1': '4', 'operation': 'evolve', 'user': 'test'}

  $ hg obslog

  @  bb847d1d3a5f (4) apricot and coconut

  |

  x  2868fe6df617 (3) apricot and coconut

  |

  x  32acf8fb1b23 (2) apricot and coconut

  |

  x  692cc7b6212c (0) apricot