view tests/test-merge-criss-cross.t @ 36534:5faeabb07cf5

debugcommands: support for triggering push protocol

The mechanism for pushing to a remote is a bit more complicated
than other commands. On SSH, we wait for a positive reply from
the server before we start sending the bundle payload.

This commit adds a mechanism to the "command" action in
`hg debugwireproto` to trigger the "push protocol" and to
specify a file whose contents should be submitted as the command
payload.

With this new feature, we implement a handful of tests for the
"unbundle" command. We try to cover various server failures and
hook/output scenarios so protocol behavior is as comprehensively
tested as possible. Even with so much test output, we only cover
bundle1 with Python hooks. There's still a lot of test coverage
that needs to be implemented. But this is certainly a good start.

Because there are so many new tests, we split these tests into their
own test file.

In order to make output deterministic, we need to disable the
doublepipe primitive. We add an option to `hg debugwireproto`
to do that. Because something in the bowels of the peer does a
read of stderr, we still capture read I/O from stderr. So there
is test coverage of what the server emits.

The tests around I/O capture some wonkiness. For example,
interleaved ui.write() and ui.write_err() calls are emitted in
order. However, (presumably due to buffering), print() to
sys.stdout and sys.stderr aren't in order.

We currently only test bundle1 because bundle2 is substantially
harder to test because it is more complicated (the server responds
with a stream containing a bundle2 instead of a frame).

Differential Revision: https://phab.mercurial-scm.org/D2471

Criss cross merging

  $ hg init criss-cross
  $ cd criss-cross
  $ echo '0 base' > f1
  $ echo '0 base' > f2
  $ hg ci -Aqm '0 base'

  $ echo '1 first change' > f1
  $ hg ci -m '1 first change f1'

  $ hg up -qr0
  $ echo '2 first change' > f2
  $ mkdir d1
  $ echo '0 base' > d1/f3
  $ echo '0 base' > d1/f4
  $ hg add -q d1
  $ hg ci -qm '2 first change f2'

  $ hg merge -qr 1
  $ hg rm d1/f3
  $ hg mv -q d1 d2
  $ hg ci -m '3 merge'

  $ hg up -qr2
  $ hg merge -qr1
  $ hg ci -qm '4 merge'

  $ echo '5 second change' > f1
  $ hg ci -m '5 second change f1'

  $ hg up -r3
  2 files updated, 0 files merged, 2 files removed, 0 files unresolved
  $ echo '6 second change' > f2
  $ hg ci -m '6 second change f2'

  $ hg log -G
  @  changeset:   6:6373bbfdae1d
  |  tag:         tip
  |  parent:      3:c202c8af058d
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     6 second change f2
  |
  | o  changeset:   5:e673248094b1
  | |  user:        test
  | |  date:        Thu Jan 01 00:00:00 1970 +0000
  | |  summary:     5 second change f1
  | |
  | o    changeset:   4:177f58377c06
  | |\   parent:      2:d1d156401c1b
  | | |  parent:      1:0f6b37dbe527
  | | |  user:        test
  | | |  date:        Thu Jan 01 00:00:00 1970 +0000
  | | |  summary:     4 merge
  | | |
  o---+  changeset:   3:c202c8af058d
  | | |  parent:      2:d1d156401c1b
  |/ /   parent:      1:0f6b37dbe527
  | |    user:        test
  | |    date:        Thu Jan 01 00:00:00 1970 +0000
  | |    summary:     3 merge
  | |
  | o  changeset:   2:d1d156401c1b
  | |  parent:      0:40494bf2444c
  | |  user:        test
  | |  date:        Thu Jan 01 00:00:00 1970 +0000
  | |  summary:     2 first change f2
  | |
  o |  changeset:   1:0f6b37dbe527
  |/   user:        test
  |    date:        Thu Jan 01 00:00:00 1970 +0000
  |    summary:     1 first change f1
  |
  o  changeset:   0:40494bf2444c
     user:        test
     date:        Thu Jan 01 00:00:00 1970 +0000
     summary:     0 base
  

  $ hg merge -v --debug --tool internal:dump 5 --config merge.preferancestor='!'
  note: using 0f6b37dbe527 as ancestor of 6373bbfdae1d and e673248094b1
        alternatively, use --config merge.preferancestor=d1d156401c1b
    searching for copies back to rev 3
    unmatched files in local:
     d2/f4
    unmatched files in other:
     d1/f3
     d1/f4
    all copies found (* = to merge, ! = divergent, % = renamed and deleted):
     src: 'd1/f4' -> dst: 'd2/f4' 
    checking for directory renames
     discovered dir src: 'd1/' -> dst: 'd2/'
     pending file src: 'd1/f3' -> dst: 'd2/f3'
     pending file src: 'd1/f4' -> dst: 'd2/f4'
  resolving manifests
   branchmerge: True, force: False, partial: False
   ancestor: 0f6b37dbe527, local: 6373bbfdae1d+, remote: e673248094b1
   preserving d2/f4 for resolve of d2/f4
   preserving f2 for resolve of f2
   f1: remote is newer -> g
  getting f1
   d2/f3: local directory rename - get from d1/f3 -> dg
  getting d1/f3 to d2/f3
   d2/f4: local directory rename, both created -> m (premerge)
   f2: versions differ -> m (premerge)
  picked tool ':dump' for f2 (binary False symlink False changedelete False)
  merging f2
  my f2@6373bbfdae1d+ other f2@e673248094b1 ancestor f2@0f6b37dbe527
   f2: versions differ -> m (merge)
  picked tool ':dump' for f2 (binary False symlink False changedelete False)
  my f2@6373bbfdae1d+ other f2@e673248094b1 ancestor f2@0f6b37dbe527
  3 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]

  $ f --dump --recurse *
  d2: directory with 2 files
  d2/f3:
  >>>
  0 base
  <<<
  d2/f4:
  >>>
  0 base
  <<<
  f1:
  >>>
  5 second change
  <<<
  f2:
  >>>
  6 second change
  <<<
  f2.base:
  >>>
  0 base
  <<<
  f2.local:
  >>>
  6 second change
  <<<
  f2.orig:
  >>>
  6 second change
  <<<
  f2.other:
  >>>
  2 first change
  <<<

  $ hg up -qC .
  $ hg merge -v --tool internal:dump 5 --config merge.preferancestor="null 40663881 3b08d"
  note: using 0f6b37dbe527 as ancestor of 6373bbfdae1d and e673248094b1
        alternatively, use --config merge.preferancestor=d1d156401c1b
  resolving manifests
  getting f1
  getting d1/f3 to d2/f3
  merging f2
  3 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]

Redo merge with merge.preferancestor="*" to enable bid merge

  $ rm f*
  $ hg up -qC .
  $ hg merge -v --debug --tool internal:dump 5 --config merge.preferancestor="*"
  note: merging 6373bbfdae1d+ and e673248094b1 using bids from ancestors 0f6b37dbe527 and d1d156401c1b
  
  calculating bids for ancestor 0f6b37dbe527
    searching for copies back to rev 3
    unmatched files in local:
     d2/f4
    unmatched files in other:
     d1/f3
     d1/f4
    all copies found (* = to merge, ! = divergent, % = renamed and deleted):
     src: 'd1/f4' -> dst: 'd2/f4' 
    checking for directory renames
     discovered dir src: 'd1/' -> dst: 'd2/'
     pending file src: 'd1/f3' -> dst: 'd2/f3'
     pending file src: 'd1/f4' -> dst: 'd2/f4'
  resolving manifests
   branchmerge: True, force: False, partial: False
   ancestor: 0f6b37dbe527, local: 6373bbfdae1d+, remote: e673248094b1
   d2/f3: local directory rename - get from d1/f3 -> dg
   d2/f4: local directory rename, both created -> m
   f1: remote is newer -> g
   f2: versions differ -> m
  
  calculating bids for ancestor d1d156401c1b
    searching for copies back to rev 3
    unmatched files in local:
     d2/f4
    all copies found (* = to merge, ! = divergent, % = renamed and deleted):
     src: 'd1/f4' -> dst: 'd2/f4' 
    checking for directory renames
     discovered dir src: 'd1/' -> dst: 'd2/'
  resolving manifests
   branchmerge: True, force: False, partial: False
   ancestor: d1d156401c1b, local: 6373bbfdae1d+, remote: e673248094b1
   f1: versions differ -> m
   f2: remote unchanged -> k
  
  auction for merging merge bids
   d2/f3: consensus for dg
   d2/f4: consensus for m
   f1: picking 'get' action
   f2: picking 'keep' action
  end of auction
  
   preserving d2/f4 for resolve of d2/f4
   f1: remote is newer -> g
  getting f1
   f2: remote unchanged -> k
   d2/f3: local directory rename - get from d1/f3 -> dg
  getting d1/f3 to d2/f3
   d2/f4: local directory rename, both created -> m (premerge)
  3 files updated, 0 files merged, 0 files removed, 0 files unresolved
  (branch merge, don't forget to commit)

  $ f --dump --recurse *
  d2: directory with 2 files
  d2/f3:
  >>>
  0 base
  <<<
  d2/f4:
  >>>
  0 base
  <<<
  f1:
  >>>
  5 second change
  <<<
  f2:
  >>>
  6 second change
  <<<


The other way around:

  $ hg up -C -r5
  4 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ hg merge -v --debug --config merge.preferancestor="*"
  note: merging e673248094b1+ and 6373bbfdae1d using bids from ancestors 0f6b37dbe527 and d1d156401c1b
  
  calculating bids for ancestor 0f6b37dbe527
    searching for copies back to rev 3
    unmatched files in local:
     d1/f3
     d1/f4
    unmatched files in other:
     d2/f4
    all copies found (* = to merge, ! = divergent, % = renamed and deleted):
     src: 'd1/f4' -> dst: 'd2/f4' 
    checking for directory renames
     discovered dir src: 'd1/' -> dst: 'd2/'
     pending file src: 'd1/f3' -> dst: 'd2/f3'
     pending file src: 'd1/f4' -> dst: 'd2/f4'
  resolving manifests
   branchmerge: True, force: False, partial: False
   ancestor: 0f6b37dbe527, local: e673248094b1+, remote: 6373bbfdae1d
   d2/f3: remote directory rename - move from d1/f3 -> dm
   d2/f4: remote directory rename, both created -> m
   f1: remote unchanged -> k
   f2: versions differ -> m
  
  calculating bids for ancestor d1d156401c1b
    searching for copies back to rev 3
    unmatched files in other:
     d2/f4
    all copies found (* = to merge, ! = divergent, % = renamed and deleted):
     src: 'd1/f4' -> dst: 'd2/f4' 
    checking for directory renames
     discovered dir src: 'd1/' -> dst: 'd2/'
  resolving manifests
   branchmerge: True, force: False, partial: False
   ancestor: d1d156401c1b, local: e673248094b1+, remote: 6373bbfdae1d
   d1/f3: other deleted -> r
   d1/f4: other deleted -> r
   d2/f4: remote created -> g
   f1: versions differ -> m
   f2: remote is newer -> g
  
  auction for merging merge bids
   d1/f3: consensus for r
   d1/f4: consensus for r
   d2/f3: consensus for dm
   d2/f4: picking 'get' action
   f1: picking 'keep' action
   f2: picking 'get' action
  end of auction
  
   d1/f3: other deleted -> r
  removing d1/f3
   d1/f4: other deleted -> r
  removing d1/f4
   d2/f4: remote created -> g
  getting d2/f4
   f2: remote is newer -> g
  getting f2
   f1: remote unchanged -> k
  2 files updated, 0 files merged, 2 files removed, 0 files unresolved
  (branch merge, don't forget to commit)

  $ f --dump --recurse *
  d2: directory with 2 files
  d2/f3:
  >>>
  0 base
  <<<
  d2/f4:
  >>>
  0 base
  <<<
  f1:
  >>>
  5 second change
  <<<
  f2:
  >>>
  6 second change
  <<<

Verify how the output looks and and how verbose it is:

  $ hg up -qC
  $ hg merge
  2 files updated, 0 files merged, 2 files removed, 0 files unresolved
  (branch merge, don't forget to commit)

  $ hg up -qC tip
  $ hg merge -v
  note: merging 6373bbfdae1d+ and e673248094b1 using bids from ancestors 0f6b37dbe527 and d1d156401c1b
  
  calculating bids for ancestor 0f6b37dbe527
  resolving manifests
  
  calculating bids for ancestor d1d156401c1b
  resolving manifests
  
  auction for merging merge bids
   d2/f3: consensus for dg
   d2/f4: consensus for m
   f1: picking 'get' action
   f2: picking 'keep' action
  end of auction
  
  getting f1
  getting d1/f3 to d2/f3
  3 files updated, 0 files merged, 0 files removed, 0 files unresolved
  (branch merge, don't forget to commit)

  $ hg up -qC
  $ hg merge -v --debug --config merge.preferancestor="*"
  note: merging 6373bbfdae1d+ and e673248094b1 using bids from ancestors 0f6b37dbe527 and d1d156401c1b
  
  calculating bids for ancestor 0f6b37dbe527
    searching for copies back to rev 3
    unmatched files in local:
     d2/f4
    unmatched files in other:
     d1/f3
     d1/f4
    all copies found (* = to merge, ! = divergent, % = renamed and deleted):
     src: 'd1/f4' -> dst: 'd2/f4' 
    checking for directory renames
     discovered dir src: 'd1/' -> dst: 'd2/'
     pending file src: 'd1/f3' -> dst: 'd2/f3'
     pending file src: 'd1/f4' -> dst: 'd2/f4'
  resolving manifests
   branchmerge: True, force: False, partial: False
   ancestor: 0f6b37dbe527, local: 6373bbfdae1d+, remote: e673248094b1
   d2/f3: local directory rename - get from d1/f3 -> dg
   d2/f4: local directory rename, both created -> m
   f1: remote is newer -> g
   f2: versions differ -> m
  
  calculating bids for ancestor d1d156401c1b
    searching for copies back to rev 3
    unmatched files in local:
     d2/f4
    all copies found (* = to merge, ! = divergent, % = renamed and deleted):
     src: 'd1/f4' -> dst: 'd2/f4' 
    checking for directory renames
     discovered dir src: 'd1/' -> dst: 'd2/'
  resolving manifests
   branchmerge: True, force: False, partial: False
   ancestor: d1d156401c1b, local: 6373bbfdae1d+, remote: e673248094b1
   f1: versions differ -> m
   f2: remote unchanged -> k
  
  auction for merging merge bids
   d2/f3: consensus for dg
   d2/f4: consensus for m
   f1: picking 'get' action
   f2: picking 'keep' action
  end of auction
  
   preserving d2/f4 for resolve of d2/f4
   f1: remote is newer -> g
  getting f1
   f2: remote unchanged -> k
   d2/f3: local directory rename - get from d1/f3 -> dg
  getting d1/f3 to d2/f3
   d2/f4: local directory rename, both created -> m (premerge)
  3 files updated, 0 files merged, 0 files removed, 0 files unresolved
  (branch merge, don't forget to commit)

  $ cd ..

http://stackoverflow.com/questions/9350005/how-do-i-specify-a-merge-base-to-use-in-a-hg-merge/9430810

  $ hg init ancestor-merging
  $ cd ancestor-merging
  $ echo a > x
  $ hg commit -A -m a x
  $ hg update -q 0
  $ echo b >> x
  $ hg commit -m b
  $ hg update -q 0
  $ echo c >> x
  $ hg commit -qm c
  $ hg update -q 1
  $ hg merge -q --tool internal:local 2
  $ echo c >> x
  $ hg commit -m bc
  $ hg update -q 2
  $ hg merge -q --tool internal:local 1
  $ echo b >> x
  $ hg commit -qm cb

  $ hg merge --config merge.preferancestor='!'
  note: using 70008a2163f6 as ancestor of 0d355fdef312 and 4b8b546a3eef
        alternatively, use --config merge.preferancestor=b211bbc6eb3c
  merging x
  0 files updated, 1 files merged, 0 files removed, 0 files unresolved
  (branch merge, don't forget to commit)
  $ cat x
  a
  c
  b
  c

  $ hg up -qC .

  $ hg merge --config merge.preferancestor=b211bbc6eb3c
  note: using b211bbc6eb3c as ancestor of 0d355fdef312 and 4b8b546a3eef
        alternatively, use --config merge.preferancestor=70008a2163f6
  merging x
  0 files updated, 1 files merged, 0 files removed, 0 files unresolved
  (branch merge, don't forget to commit)
  $ cat x
  a
  b
  c
  b

  $ hg up -qC .

  $ hg merge -v --config merge.preferancestor="*"
  note: merging 0d355fdef312+ and 4b8b546a3eef using bids from ancestors 70008a2163f6 and b211bbc6eb3c
  
  calculating bids for ancestor 70008a2163f6
  resolving manifests
  
  calculating bids for ancestor b211bbc6eb3c
  resolving manifests
  
  auction for merging merge bids
   x: multiple bids for merge action:
    versions differ -> m
    versions differ -> m
   x: ambiguous merge - picked m action
  end of auction
  
  merging x
  0 files updated, 1 files merged, 0 files removed, 0 files unresolved
  (branch merge, don't forget to commit)
  $ cat x
  a
  c
  b
  c

Verify that the old context ancestor works with / despite preferancestor:

  $ hg log -r 'ancestor(head())' --config merge.preferancestor=1 -T '{rev}\n'
  1
  $ hg log -r 'ancestor(head())' --config merge.preferancestor=2 -T '{rev}\n'
  2
  $ hg log -r 'ancestor(head())' --config merge.preferancestor=3 -T '{rev}\n'
  1
  $ hg log -r 'ancestor(head())' --config merge.preferancestor='1337 * - 2' -T '{rev}\n'
  2

  $ cd ..