view tests/test-stablesort-branchpoint.t @ 6935:954d7ea5cd67 stable tip

stack: when stack base is obsolete, pick any successor, even if at random

There are situations when s0 is obsolete and we also cannot pick just one
successor for it to use in stack. In such a case, let's pick the "latest"
successor from the first set.

We're assuming that obsutil.successorssets() returns data in the same order (it
should, since it makes sure to sort data internally). Keeping that in mind,
while the successor picked for s0 by this code is not based on any sort of
sophisticated logic, it should nonetheless be the same every time.

This patch is probably not going to completely break anything that was
previously working fine, because the previous behavior was to just abort with
an exception.

Test for stable ordering capabilities
=====================================

  $ . $TESTDIR/testlib/pythonpath.sh

  $ cat << EOF >> $HGRCPATH
  > [extensions]
  > evolve =
  > [ui]
  > logtemplate = "{rev} {node|short} {desc} {tags}\n"
  > [alias]
  > showsort = debug::evo-ext-stable-sort --template="{node|short}\n" --method branchpoint
  > EOF

  $ checktopo () {
  >     seen='null';
  >     for node in `hg showsort --rev "$1"`; do
  >         echo "=== checking $node ===";
  >         hg log --rev "($seen) and $node::";
  >         seen="${seen}+${node}";
  >     done;
  > }

Basic tests
===========
(no criss cross merge)

Smoke tests
-----------

Starts with a "simple case"

  $ hg init repo_A
  $ cd repo_A
  $ hg debugbuilddag '
  > ..:g   # 2 nodes, tagged "g"
  > <2.:h   # another node base one -2 -> 0, tagged "h"
  > *1/2:m # merge -1 and -2 (1, 2), tagged "m"
  > <2+2:i # 2 nodes based on -2, tag head as "i"
  > .:c    # 1 node tagged "c"
  > <m+3:a # 3 nodes base on the "m" tag
  > <2.:b  # 1 node based on -2; tagged "b"
  > <m+2:d # 2 nodes from "m" tagged "d"
  > <2.:e  # 1 node based on -2, tagged "e"
  > <m+1:f # 1 node based on "m" tagged "f"
  > <i/f   # merge "i" and "f"
  > '
  $ hg log -G
  o    15 1d8d22637c2d r15 tip
  |\
  | o  14 43227190fef8 r14 f
  | |
  | | o  13 b4594d867745 r13 e
  | | |
  | | | o  12 e46a4836065c r12 d
  | | |/
  | | o  11 bab5d5bf48bd r11
  | |/
  | | o  10 ff43616e5d0f r10 b
  | | |
  | | | o  9 dcbb326fdec2 r9 a
  | | |/
  | | o  8 d62d843c9a01 r8
  | | |
  | | o  7 e7d9710d9fc6 r7
  | |/
  +---o  6 2702dd0c91e7 r6 c
  | |
  o |  5 f0f3ef9a6cd5 r5 i
  | |
  o |  4 4c748ffd1a46 r4
  | |
  | o  3 2b6d669947cd r3 m
  |/|
  o |  2 fa942426a6fd r2 h
  | |
  | o  1 66f7d451a68b r1 g
  |/
  o  0 1ea73414a91b r0
  
  $ hg debugdepth -r 'all()'
  1ea73414a91b 1
  66f7d451a68b 2
  fa942426a6fd 2
  2b6d669947cd 4
  4c748ffd1a46 3
  f0f3ef9a6cd5 4
  2702dd0c91e7 5
  e7d9710d9fc6 5
  d62d843c9a01 6
  dcbb326fdec2 7
  ff43616e5d0f 7
  bab5d5bf48bd 5
  e46a4836065c 6
  b4594d867745 6
  43227190fef8 5
  1d8d22637c2d 8
  $ hg showsort --rev 'all()' --traceback
  1ea73414a91b
  66f7d451a68b
  fa942426a6fd
  2b6d669947cd
  43227190fef8
  bab5d5bf48bd
  b4594d867745
  e46a4836065c
  e7d9710d9fc6
  d62d843c9a01
  dcbb326fdec2
  ff43616e5d0f
  4c748ffd1a46
  f0f3ef9a6cd5
  1d8d22637c2d
  2702dd0c91e7

Verify the topological order
----------------------------

Check we we did not issued a node before on ancestor

output of log should be empty

  $ checktopo 'all()'
  === checking 1ea73414a91b ===
  === checking 66f7d451a68b ===
  === checking fa942426a6fd ===
  === checking 2b6d669947cd ===
  === checking 43227190fef8 ===
  === checking bab5d5bf48bd ===
  === checking b4594d867745 ===
  === checking e46a4836065c ===
  === checking e7d9710d9fc6 ===
  === checking d62d843c9a01 ===
  === checking dcbb326fdec2 ===
  === checking ff43616e5d0f ===
  === checking 4c748ffd1a46 ===
  === checking f0f3ef9a6cd5 ===
  === checking 1d8d22637c2d ===
  === checking 2702dd0c91e7 ===

Check stability
===============

have repo with changesets in orders

  $ cd ..
  $ hg -R repo_A log -G > A.log
  $ hg clone repo_A repo_B --rev 5
  adding changesets
  adding manifests
  adding file changes
  added 4 changesets with 0 changes to 0 files
  new changesets 1ea73414a91b:f0f3ef9a6cd5
  updating to branch default
  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg -R repo_B pull --rev 13
  pulling from $TESTTMP/repo_A (glob)
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 4 changesets with 0 changes to 0 files (+1 heads)
  new changesets 66f7d451a68b:b4594d867745
  (run 'hg heads' to see heads, 'hg merge' to merge)
  $ hg -R repo_B pull --rev 14
  pulling from $TESTTMP/repo_A (glob)
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 0 changes to 0 files (+1 heads)
  new changesets 43227190fef8
  (run 'hg heads .' to see heads, 'hg merge' to merge)
  $ hg -R repo_B pull
  pulling from $TESTTMP/repo_A (glob)
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 7 changesets with 0 changes to 0 files (+3 heads)
  new changesets 2702dd0c91e7:1d8d22637c2d
  (run 'hg heads .' to see heads, 'hg merge' to merge)
  $ hg -R repo_B log -G
  o    15 1d8d22637c2d r15 tip
  |\
  | | o  14 e46a4836065c r12
  | | |
  | | | o  13 ff43616e5d0f r10
  | | | |
  | | | | o  12 dcbb326fdec2 r9
  | | | |/
  | | | o  11 d62d843c9a01 r8
  | | | |
  | | | o  10 e7d9710d9fc6 r7
  | | | |
  +-------o  9 2702dd0c91e7 r6
  | | | |
  | o---+  8 43227190fef8 r14
  |  / /
  | +---o  7 b4594d867745 r13
  | | |
  | o |  6 bab5d5bf48bd r11
  | |/
  | o    5 2b6d669947cd r3
  | |\
  | | o  4 66f7d451a68b r1
  | | |
  @ | |  3 f0f3ef9a6cd5 r5
  | | |
  o | |  2 4c748ffd1a46 r4
  |/ /
  o /  1 fa942426a6fd r2
  |/
  o  0 1ea73414a91b r0
  
  $ hg -R repo_B debugdepth -r 'all()'
  1ea73414a91b 1
  fa942426a6fd 2
  4c748ffd1a46 3
  f0f3ef9a6cd5 4
  66f7d451a68b 2
  2b6d669947cd 4
  bab5d5bf48bd 5
  b4594d867745 6
  43227190fef8 5
  2702dd0c91e7 5
  e7d9710d9fc6 5
  d62d843c9a01 6
  dcbb326fdec2 7
  ff43616e5d0f 7
  e46a4836065c 6
  1d8d22637c2d 8
  $ hg -R repo_B log -G > B.log

  $ hg clone repo_A repo_C --rev 10
  adding changesets
  adding manifests
  adding file changes
  added 7 changesets with 0 changes to 0 files
  new changesets 1ea73414a91b:ff43616e5d0f
  updating to branch default
  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg -R repo_C pull --rev 12
  pulling from $TESTTMP/repo_A (glob)
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 2 changesets with 0 changes to 0 files (+1 heads)
  new changesets bab5d5bf48bd:e46a4836065c
  (run 'hg heads' to see heads, 'hg merge' to merge)
  $ hg -R repo_C pull --rev 15
  pulling from $TESTTMP/repo_A (glob)
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 4 changesets with 0 changes to 0 files (+1 heads)
  new changesets 4c748ffd1a46:1d8d22637c2d
  (run 'hg heads .' to see heads, 'hg merge' to merge)
  $ hg -R repo_C pull
  pulling from $TESTTMP/repo_A (glob)
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 3 changesets with 0 changes to 0 files (+3 heads)
  new changesets 2702dd0c91e7:b4594d867745
  (run 'hg heads .' to see heads, 'hg merge' to merge)
  $ hg -R repo_C log -G
  o  15 b4594d867745 r13 tip
  |
  | o  14 dcbb326fdec2 r9
  | |
  | | o  13 2702dd0c91e7 r6
  | | |
  | | | o  12 1d8d22637c2d r15
  | | |/|
  | | | o  11 43227190fef8 r14
  | | | |
  | | o |  10 f0f3ef9a6cd5 r5
  | | | |
  | | o |  9 4c748ffd1a46 r4
  | | | |
  +-------o  8 e46a4836065c r12
  | | | |
  o-----+  7 bab5d5bf48bd r11
   / / /
  +-----@  6 ff43616e5d0f r10
  | | |
  o | |  5 d62d843c9a01 r8
  | | |
  o---+  4 e7d9710d9fc6 r7
   / /
  | o  3 2b6d669947cd r3
  |/|
  o |  2 fa942426a6fd r2
  | |
  | o  1 66f7d451a68b r1
  |/
  o  0 1ea73414a91b r0
  
  $ hg -R repo_C log -G > C.log

  $ hg clone repo_A repo_D --rev 2
  adding changesets
  adding manifests
  adding file changes
  added 2 changesets with 0 changes to 0 files
  new changesets 1ea73414a91b:fa942426a6fd
  updating to branch default
  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg -R repo_D pull --rev 10
  pulling from $TESTTMP/repo_A (glob)
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 5 changesets with 0 changes to 0 files
  new changesets 66f7d451a68b:ff43616e5d0f
  (run 'hg update' to get a working copy)
  $ hg -R repo_D pull --rev 15
  pulling from $TESTTMP/repo_A (glob)
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 4 changesets with 0 changes to 0 files (+1 heads)
  new changesets 4c748ffd1a46:1d8d22637c2d
  (run 'hg heads' to see heads, 'hg merge' to merge)
  $ hg -R repo_D pull
  pulling from $TESTTMP/repo_A (glob)
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 5 changesets with 0 changes to 0 files (+4 heads)
  new changesets 2702dd0c91e7:b4594d867745
  (run 'hg heads .' to see heads, 'hg merge' to merge)
  $ hg -R repo_D log -G
  o  15 b4594d867745 r13 tip
  |
  | o  14 e46a4836065c r12
  |/
  o  13 bab5d5bf48bd r11
  |
  | o  12 dcbb326fdec2 r9
  | |
  | | o  11 2702dd0c91e7 r6
  | | |
  | | | o  10 1d8d22637c2d r15
  | | |/|
  +-----o  9 43227190fef8 r14
  | | |
  | | o  8 f0f3ef9a6cd5 r5
  | | |
  | | o  7 4c748ffd1a46 r4
  | | |
  | +---o  6 ff43616e5d0f r10
  | | |
  | o |  5 d62d843c9a01 r8
  | | |
  | o |  4 e7d9710d9fc6 r7
  |/ /
  o |  3 2b6d669947cd r3
  |\|
  o |  2 66f7d451a68b r1
  | |
  | @  1 fa942426a6fd r2
  |/
  o  0 1ea73414a91b r0
  
  $ hg -R repo_D log -G > D.log

check the log output are different

  $ "$PYTHON" "$RUNTESTDIR/md5sum.py" *.log
  55919ebc9c02f28070cf3255b1690f8c  A.log
  c6244b76a60d0707767dc71780e544f3  B.log
  4d8b08b8c50ecbdd2460a62e5852d84d  C.log
  0f327003593b50b9591bea8ee28acb81  D.log

bug stable ordering should be identical
---------------------------------------

  $ repos="A B C D "

for 'all()'

  $ for x in $repos; do
  >     echo $x
  >     hg -R repo_$x showsort --rev 'all()' > ${x}.all.order;
  > done
  A
  B
  C
  D

  $ "$PYTHON" "$RUNTESTDIR/md5sum.py" *.all.order
  0c6b2e6f15249c0359b0f93e28c5bd1c  A.all.order
  0c6b2e6f15249c0359b0f93e28c5bd1c  B.all.order
  0c6b2e6f15249c0359b0f93e28c5bd1c  C.all.order
  0c6b2e6f15249c0359b0f93e28c5bd1c  D.all.order

one specific head

  $ for x in $repos; do
  >     hg -R repo_$x showsort --rev 'b4594d867745' > ${x}.b4594d867745.order;
  > done

  $ "$PYTHON" "$RUNTESTDIR/md5sum.py" *.b4594d867745.order
  5c40900a22008f24eab8dfe2f30ad79f  A.b4594d867745.order
  5c40900a22008f24eab8dfe2f30ad79f  B.b4594d867745.order
  5c40900a22008f24eab8dfe2f30ad79f  C.b4594d867745.order
  5c40900a22008f24eab8dfe2f30ad79f  D.b4594d867745.order

one secific heads, that is a merge

  $ for x in $repos; do
  >     hg -R repo_$x showsort --rev '1d8d22637c2d' > ${x}.1d8d22637c2d.order;
  > done

  $ "$PYTHON" "$RUNTESTDIR/md5sum.py" *.1d8d22637c2d.order
  77dc20a6f86db9103df8edaae9ad2754  A.1d8d22637c2d.order
  77dc20a6f86db9103df8edaae9ad2754  B.1d8d22637c2d.order
  77dc20a6f86db9103df8edaae9ad2754  C.1d8d22637c2d.order
  77dc20a6f86db9103df8edaae9ad2754  D.1d8d22637c2d.order

changeset that are not heads

  $ for x in $repos; do
  >     hg -R repo_$x showsort --rev 'e7d9710d9fc6+43227190fef8' > ${x}.non-heads.order;
  > done

  $ "$PYTHON" "$RUNTESTDIR/md5sum.py" *.non-heads.order
  94e0ea8cdade135dabde4ec5e9954329  A.non-heads.order
  94e0ea8cdade135dabde4ec5e9954329  B.non-heads.order
  94e0ea8cdade135dabde4ec5e9954329  C.non-heads.order
  94e0ea8cdade135dabde4ec5e9954329  D.non-heads.order

Check with different subset

  $ hg clone repo_A repo_E --rev "43227190fef8"
  adding changesets
  adding manifests
  adding file changes
  added 5 changesets with 0 changes to 0 files
  new changesets 1ea73414a91b:43227190fef8
  updating to branch default
  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg -R repo_E pull --rev e7d9710d9fc6
  pulling from $TESTTMP/repo_A (glob)
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 0 changes to 0 files (+1 heads)
  new changesets e7d9710d9fc6
  (run 'hg heads' to see heads, 'hg merge' to merge)

  $ hg clone repo_A repo_F --rev "1d8d22637c2d"
  adding changesets
  adding manifests
  adding file changes
  added 8 changesets with 0 changes to 0 files
  new changesets 1ea73414a91b:1d8d22637c2d
  updating to branch default
  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg -R repo_F pull --rev d62d843c9a01
  pulling from $TESTTMP/repo_A (glob)
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 2 changesets with 0 changes to 0 files (+1 heads)
  new changesets e7d9710d9fc6:d62d843c9a01
  (run 'hg heads' to see heads, 'hg merge' to merge)

  $ hg clone repo_A repo_G --rev "e7d9710d9fc6"
  adding changesets
  adding manifests
  adding file changes
  added 5 changesets with 0 changes to 0 files
  new changesets 1ea73414a91b:e7d9710d9fc6
  updating to branch default
  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg -R repo_G pull --rev 43227190fef8
  pulling from $TESTTMP/repo_A (glob)
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 0 changes to 0 files (+1 heads)
  new changesets 43227190fef8
  (run 'hg heads' to see heads, 'hg merge' to merge)
  $ hg -R repo_G pull --rev 2702dd0c91e7
  pulling from $TESTTMP/repo_A (glob)
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 3 changesets with 0 changes to 0 files (+1 heads)
  new changesets 4c748ffd1a46:2702dd0c91e7
  (run 'hg heads .' to see heads, 'hg merge' to merge)

  $ for x in E F G; do
  >     hg -R repo_$x showsort --rev 'e7d9710d9fc6+43227190fef8' > ${x}.non-heads.order;
  > done

  $ "$PYTHON" "$RUNTESTDIR/md5sum.py" *.non-heads.order
  94e0ea8cdade135dabde4ec5e9954329  A.non-heads.order
  94e0ea8cdade135dabde4ec5e9954329  B.non-heads.order
  94e0ea8cdade135dabde4ec5e9954329  C.non-heads.order
  94e0ea8cdade135dabde4ec5e9954329  D.non-heads.order
  94e0ea8cdade135dabde4ec5e9954329  E.non-heads.order
  94e0ea8cdade135dabde4ec5e9954329  F.non-heads.order
  94e0ea8cdade135dabde4ec5e9954329  G.non-heads.order

Multiple recursions
===================

  $ hg init recursion_A
  $ cd recursion_A
  $ hg debugbuilddag '
  > .:base
  > +3:A
  > <base.:B
  > +2/A:C
  > <A+2:D
  > <B./D:E
  > +3:F
  > <C+3/E
  > +2
  > '
  $ hg log -G
  o  20 160a7a0adbf4 r20 tip
  |
  o  19 1c645e73dbc6 r19
  |
  o    18 0496f0a6a143 r18
  |\
  | o  17 d64d500024d1 r17
  | |
  | o  16 4dbf739dd63f r16
  | |
  | o  15 9fff0871d230 r15
  | |
  | | o  14 4bbfc6078919 r14 F
  | | |
  | | o  13 013b27f11536 r13
  | | |
  +---o  12 a66b68853635 r12
  | |
  o |    11 001194dd78d5 r11 E
  |\ \
  | o |  10 6ee532b68cfa r10
  | | |
  o | |  9 529dfc5bb875 r9 D
  | | |
  o | |  8 abf57d94268b r8
  | | |
  +---o  7 5f18015f9110 r7 C
  | | |
  | | o  6 a2f58e9c1e56 r6
  | | |
  | | o  5 3a367db1fabc r5
  | |/
  | o  4 e7bd5218ca15 r4 B
  | |
  o |  3 2dc09a01254d r3 A
  | |
  o |  2 01241442b3c2 r2
  | |
  o |  1 66f7d451a68b r1
  |/
  o  0 1ea73414a91b r0 base
  
  $ hg debugdepth -r 'all()'
  1ea73414a91b 1
  66f7d451a68b 2
  01241442b3c2 3
  2dc09a01254d 4
  e7bd5218ca15 2
  3a367db1fabc 3
  a2f58e9c1e56 4
  5f18015f9110 8
  abf57d94268b 5
  529dfc5bb875 6
  6ee532b68cfa 3
  001194dd78d5 9
  a66b68853635 10
  013b27f11536 11
  4bbfc6078919 12
  9fff0871d230 9
  4dbf739dd63f 10
  d64d500024d1 11
  0496f0a6a143 16
  1c645e73dbc6 17
  160a7a0adbf4 18
  $ hg showsort --rev 'all()'
  1ea73414a91b
  66f7d451a68b
  01241442b3c2
  2dc09a01254d
  abf57d94268b
  529dfc5bb875
  e7bd5218ca15
  3a367db1fabc
  a2f58e9c1e56
  5f18015f9110
  9fff0871d230
  4dbf739dd63f
  d64d500024d1
  6ee532b68cfa
  001194dd78d5
  0496f0a6a143
  1c645e73dbc6
  160a7a0adbf4
  a66b68853635
  013b27f11536
  4bbfc6078919
  $ checktopo 'all()'
  === checking 1ea73414a91b ===
  === checking 66f7d451a68b ===
  === checking 01241442b3c2 ===
  === checking 2dc09a01254d ===
  === checking abf57d94268b ===
  === checking 529dfc5bb875 ===
  === checking e7bd5218ca15 ===
  === checking 3a367db1fabc ===
  === checking a2f58e9c1e56 ===
  === checking 5f18015f9110 ===
  === checking 9fff0871d230 ===
  === checking 4dbf739dd63f ===
  === checking d64d500024d1 ===
  === checking 6ee532b68cfa ===
  === checking 001194dd78d5 ===
  === checking 0496f0a6a143 ===
  === checking 1c645e73dbc6 ===
  === checking 160a7a0adbf4 ===
  === checking a66b68853635 ===
  === checking 013b27f11536 ===
  === checking 4bbfc6078919 ===
  $ hg showsort --rev 'all()' > ../multiple.source.order
  $ hg log -r tip
  20 160a7a0adbf4 r20 tip
  $ cd ..

  $ hg clone recursion_A recursion_random --rev 0
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 0 changes to 0 files
  new changesets 1ea73414a91b
  updating to branch default
  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ cd recursion_random
  $ for x in `"$PYTHON" "$TESTDIR/testlib/random-revs.py" 15 5`; do
  >   # using python to benefit from the random seed
  >   hg pull -r $x --quiet
  > done;
  $ hg pull --quiet
  $ hg showsort --rev 'all()' > ../multiple.random.order
  $ "$PYTHON" "$RUNTESTDIR/md5sum.py" ../multiple.*.order
  6ff802a0a5f0a3ddd82b25f860238fbd  ../multiple.random.order
  6ff802a0a5f0a3ddd82b25f860238fbd  ../multiple.source.order
  $ hg showsort --rev 'all()'
  1ea73414a91b
  66f7d451a68b
  01241442b3c2
  2dc09a01254d
  abf57d94268b
  529dfc5bb875
  e7bd5218ca15
  3a367db1fabc
  a2f58e9c1e56
  5f18015f9110
  9fff0871d230
  4dbf739dd63f
  d64d500024d1
  6ee532b68cfa
  001194dd78d5
  0496f0a6a143
  1c645e73dbc6
  160a7a0adbf4
  a66b68853635
  013b27f11536
  4bbfc6078919
  $ cd ..


Test behavior with oedipus merges
=================================

  $ hg init recursion_oedipus
  $ cd recursion_oedipus
  $ echo base > base
  $ hg add base
  $ hg ci -m base
  $ hg branch foo
  marked working directory as branch foo
  (branches are permanent and global, did you want a bookmark?)
  $ echo foo1 > foo1
  $ hg add foo1
  $ hg ci -m foo1
  $ echo foo2 > foo2
  $ hg add foo2
  $ hg ci -m foo2
  $ hg up default
  0 files updated, 0 files merged, 2 files removed, 0 files unresolved
  $ hg merge foo
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  (branch merge, don't forget to commit)
  $ hg ci -m oedipus_merge
  $ echo default1 > default1
  $ hg add default1
  $ hg ci -m default1
  $ hg log -G 
  @  4 7f2454f6b04f default1 tip
  |
  o    3 ed776db7ed63 oedipus_merge
  |\
  | o  2 0dedbcd995b6 foo2
  | |
  | o  1 47da0f2c25e2 foo1
  |/
  o  0 d20a80d4def3 base
  
  $ hg debugdepth -r 'all()'
  d20a80d4def3 1
  47da0f2c25e2 2
  0dedbcd995b6 3
  ed776db7ed63 4
  7f2454f6b04f 5
  $ hg showsort --rev '.'
  d20a80d4def3
  47da0f2c25e2
  0dedbcd995b6
  ed776db7ed63
  7f2454f6b04f

Merge two branches with their own independant internal merge.
-------------------------------------------------------------

  $ hg init subbranch
  $ cd subbranch
  $ hg debugbuilddag '
  > .:base
  > +3:leftBranch
  > +2:leftA
  > <leftBranch.+2:leftB
  > /leftA:leftMerge
  > <base+2:rightBranch
  > +4:rightA
  > <rightBranch.+1:rightB
  > /rightA:rightMerge
  > +3/leftMerge
  > '
  $ hg log -G
  o    22 56526aefbff4 r22 tip
  |\
  | o  21 d4422659bc40 r21
  | |
  | o  20 6a97ef856f90 r20
  | |
  | o  19 5648bbf0e38b r19
  | |
  | o    18 4442c125b80d r18 rightMerge
  | |\
  | | o  17 65e683dd6db4 r17 rightB
  | | |
  | | o  16 5188cf52b7b7 r16
  | | |
  | o |  15 191bac7bf37c r15 rightA
  | | |
  | o |  14 5cb8e6902ff3 r14
  | | |
  | o |  13 448a7ac3ab1f r13
  | | |
  | o |  12 ee222cc71ce6 r12
  | |/
  | o  11 e5c0d969abc4 r11 rightBranch
  | |
  | o  10 7cc044fdf4a7 r10
  | |
  o |    9 9f6c364a3574 r9 leftMerge
  |\ \
  | o |  8 588f0bc87ecd r8 leftB
  | | |
  | o |  7 e2317cea05f7 r7
  | | |
  | o |  6 c2c595bcd4c6 r6
  | | |
  o | |  5 c8d03c1b5e94 r5 leftA
  | | |
  o | |  4 bebd167eb94d r4
  |/ /
  o |  3 2dc09a01254d r3 leftBranch
  | |
  o |  2 01241442b3c2 r2
  | |
  o |  1 66f7d451a68b r1
  |/
  o  0 1ea73414a91b r0 base
  
  $ hg debugdepth -r 'all()'
  1ea73414a91b 1
  66f7d451a68b 2
  01241442b3c2 3
  2dc09a01254d 4
  bebd167eb94d 5
  c8d03c1b5e94 6
  c2c595bcd4c6 5
  e2317cea05f7 6
  588f0bc87ecd 7
  9f6c364a3574 10
  7cc044fdf4a7 2
  e5c0d969abc4 3
  ee222cc71ce6 4
  448a7ac3ab1f 5
  5cb8e6902ff3 6
  191bac7bf37c 7
  5188cf52b7b7 4
  65e683dd6db4 5
  4442c125b80d 10
  5648bbf0e38b 11
  6a97ef856f90 12
  d4422659bc40 13
  56526aefbff4 23
  $ hg showsort --rev 'tip'
  1ea73414a91b
  66f7d451a68b
  01241442b3c2
  2dc09a01254d
  bebd167eb94d
  c8d03c1b5e94
  c2c595bcd4c6
  e2317cea05f7
  588f0bc87ecd
  9f6c364a3574
  7cc044fdf4a7
  e5c0d969abc4
  5188cf52b7b7
  65e683dd6db4
  ee222cc71ce6
  448a7ac3ab1f
  5cb8e6902ff3
  191bac7bf37c
  4442c125b80d
  5648bbf0e38b
  6a97ef856f90
  d4422659bc40
  56526aefbff4
  $ cd ..