annotate tests/test-commit-amend.t @ 18986:2f7186400a07

ancestor: a new algorithm that is faster for nodes near tip

Instead of walking all the way to the root of the DAG, we generate
a set of candidate GCA revs, then figure out which ones will win
the race to the root (usually without needing to traverse all the
way to the root).

In the common case of nodes that are close to each other in both
revision number and topology, this is usually a big win: it makes
"hg --time debugancestors" up to 9 times faster than the more general
ancestor function when measured on heads of the linux-2.6 hg repo.

Victory is not assured, however. The older function can still win
by a large margin if one node is much closer to the root than the
other, or by a much smaller amount if one is an ancestor of the
other.

For now, we've also got a small paranoid harness function that calls
both ancestor functions on every input and ensures that they give
equivalent answers.

Even without the checker function, the old ancestor function needs
to stay alive for the time being, as its generality is used by
context.filectx.merge.

  $ hg init

Setup:

  $ echo a >> a
  $ hg ci -Am 'base'
  adding a

Refuse to amend public csets:

  $ hg phase -r . -p
  $ hg ci --amend
  abort: cannot amend public changesets
  [255]
  $ hg phase -r . -f -d

  $ echo a >> a
  $ hg ci -Am 'base1'

Nothing to amend:

  $ hg ci --amend
  nothing changed
  [1]

  $ cat >> $HGRCPATH <<EOF
  > [hooks]
  > pretxncommit.foo = sh -c "echo \\"pretxncommit \$HG_NODE\\"; hg id -r \$HG_NODE"
  > EOF

Amending changeset with changes in working dir:
(and check that --message does not trigger an editor)

  $ echo a >> a
  $ HGEDITOR="\"sh\" \"`pwd`/editor.sh\"" hg commit --amend -m 'amend base1'
  pretxncommit 43f1ba15f28a50abf0aae529cf8a16bfced7b149
  43f1ba15f28a tip
  saved backup bundle to $TESTTMP/.hg/strip-backup/489edb5b847d-amend-backup.hg (glob)
  $ echo 'pretxncommit.foo = ' >> $HGRCPATH
  $ hg diff -c .
  diff -r ad120869acf0 -r 43f1ba15f28a a
  --- a/a	Thu Jan 01 00:00:00 1970 +0000
  +++ b/a	Thu Jan 01 00:00:00 1970 +0000
  @@ -1,1 +1,3 @@
   a
  +a
  +a
  $ hg log
  changeset:   1:43f1ba15f28a
  tag:         tip
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     amend base1
  
  changeset:   0:ad120869acf0
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     base
  

Check proper abort for empty message

  $ cat > editor.sh << '__EOF__'
  > #!/bin/sh
  > echo "" > "$1"
  > __EOF__
  $ echo b > b
  $ hg add b
  $ hg summary
  parent: 1:43f1ba15f28a tip
   amend base1
  branch: default
  commit: 1 added, 1 unknown
  update: (current)
  $ HGEDITOR="\"sh\" \"`pwd`/editor.sh\"" hg commit --amend
  transaction abort!
  rollback completed
  abort: empty commit message
  [255]
  $ hg summary
  parent: 1:43f1ba15f28a tip
   amend base1
  branch: default
  commit: 1 added, 1 unknown
  update: (current)

Add new file:
  $ hg ci --amend -m 'amend base1 new file'
  saved backup bundle to $TESTTMP/.hg/strip-backup/43f1ba15f28a-amend-backup.hg (glob)

Remove file that was added in amended commit:
(and test logfile option)
(and test that logfile option do not trigger an editor)

  $ hg rm b
  $ echo 'amend base1 remove new file' > ../logfile
  $ HGEDITOR="\"sh\" \"`pwd`/editor.sh\"" hg ci --amend --logfile ../logfile
  saved backup bundle to $TESTTMP/.hg/strip-backup/b8e3cb2b3882-amend-backup.hg (glob)

  $ hg cat b
  b: no such file in rev 74609c7f506e
  [1]

No changes, just a different message:

  $ hg ci -v --amend -m 'no changes, new message'
  amending changeset 74609c7f506e
  copying changeset 74609c7f506e to ad120869acf0
  a
  stripping amended changeset 74609c7f506e
  1 changesets found
  saved backup bundle to $TESTTMP/.hg/strip-backup/74609c7f506e-amend-backup.hg (glob)
  1 changesets found
  adding branch
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 1 changes to 1 files
  committed changeset 1:1cd866679df8
  $ hg diff -c .
  diff -r ad120869acf0 -r 1cd866679df8 a
  --- a/a	Thu Jan 01 00:00:00 1970 +0000
  +++ b/a	Thu Jan 01 00:00:00 1970 +0000
  @@ -1,1 +1,3 @@
   a
  +a
  +a
  $ hg log
  changeset:   1:1cd866679df8
  tag:         tip
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     no changes, new message
  
  changeset:   0:ad120869acf0
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     base
  

Disable default date on commit so when -d isn't given, the old date is preserved:

  $ echo '[defaults]' >> $HGRCPATH
  $ echo 'commit=' >> $HGRCPATH

Test -u/-d:

  $ hg ci --amend -u foo -d '1 0'
  saved backup bundle to $TESTTMP/.hg/strip-backup/1cd866679df8-amend-backup.hg (glob)
  $ echo a >> a
  $ hg ci --amend -u foo -d '1 0'
  saved backup bundle to $TESTTMP/.hg/strip-backup/780e6f23e03d-amend-backup.hg (glob)
  $ hg log -r .
  changeset:   1:5f357c7560ab
  tag:         tip
  user:        foo
  date:        Thu Jan 01 00:00:01 1970 +0000
  summary:     no changes, new message
  

Open editor with old commit message if a message isn't given otherwise:

  $ cat > editor.sh << '__EOF__'
  > #!/bin/sh
  > cat $1
  > echo "another precious commit message" > "$1"
  > __EOF__
  $ HGEDITOR="\"sh\" \"`pwd`/editor.sh\"" hg commit --amend -v
  amending changeset 5f357c7560ab
  copying changeset 5f357c7560ab to ad120869acf0
  no changes, new message
  
  
  HG: Enter commit message.  Lines beginning with 'HG:' are removed.
  HG: Leave message empty to abort commit.
  HG: --
  HG: user: foo
  HG: branch 'default'
  HG: changed a
  a
  stripping amended changeset 5f357c7560ab
  1 changesets found
  saved backup bundle to $TESTTMP/.hg/strip-backup/5f357c7560ab-amend-backup.hg (glob)
  1 changesets found
  adding branch
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 1 changes to 1 files
  committed changeset 1:7ab3bf440b54

Same, but with changes in working dir (different code path):

  $ echo a >> a
  $ HGEDITOR="\"sh\" \"`pwd`/editor.sh\"" hg commit --amend -v
  amending changeset 7ab3bf440b54
  a
  copying changeset a0ea9b1a4c8c to ad120869acf0
  another precious commit message
  
  
  HG: Enter commit message.  Lines beginning with 'HG:' are removed.
  HG: Leave message empty to abort commit.
  HG: --
  HG: user: foo
  HG: branch 'default'
  HG: changed a
  a
  stripping intermediate changeset a0ea9b1a4c8c
  stripping amended changeset 7ab3bf440b54
  2 changesets found
  saved backup bundle to $TESTTMP/.hg/strip-backup/7ab3bf440b54-amend-backup.hg (glob)
  1 changesets found
  adding branch
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 1 changes to 1 files
  committed changeset 1:ea22a388757c

  $ rm editor.sh
  $ hg log -r .
  changeset:   1:ea22a388757c
  tag:         tip
  user:        foo
  date:        Thu Jan 01 00:00:01 1970 +0000
  summary:     another precious commit message
  

Moving bookmarks, preserve active bookmark:

  $ hg book book1
  $ hg book book2
  $ hg ci --amend -m 'move bookmarks'
  saved backup bundle to $TESTTMP/.hg/strip-backup/ea22a388757c-amend-backup.hg (glob)
  $ hg book
     book1                     1:6cec5aa930e2
   * book2                     1:6cec5aa930e2
  $ echo a >> a
  $ hg ci --amend -m 'move bookmarks'
  saved backup bundle to $TESTTMP/.hg/strip-backup/6cec5aa930e2-amend-backup.hg (glob)
  $ hg book
     book1                     1:48bb6e53a15f
   * book2                     1:48bb6e53a15f

abort does not loose bookmarks

  $ cat > editor.sh << '__EOF__'
  > #!/bin/sh
  > echo "" > "$1"
  > __EOF__
  $ echo a >> a
  $ HGEDITOR="\"sh\" \"`pwd`/editor.sh\"" hg commit --amend
  transaction abort!
  rollback completed
  abort: empty commit message
  [255]
  $ hg book
     book1                     1:48bb6e53a15f
   * book2                     1:48bb6e53a15f
  $ hg revert -Caq
  $ rm editor.sh

  $ echo '[defaults]' >> $HGRCPATH
  $ echo "commit=-d '0 0'" >> $HGRCPATH

Moving branches:

  $ hg branch foo
  marked working directory as branch foo
  (branches are permanent and global, did you want a bookmark?)
  $ echo a >> a
  $ hg ci -m 'branch foo'
  $ hg branch default -f
  marked working directory as branch default
  (branches are permanent and global, did you want a bookmark?)
  $ hg ci --amend -m 'back to default'
  saved backup bundle to $TESTTMP/.hg/strip-backup/8ac881fbf49d-amend-backup.hg (glob)
  $ hg branches
  default                        2:ce12b0b57d46

Close branch:

  $ hg up -q 0
  $ echo b >> b
  $ hg branch foo
  marked working directory as branch foo
  (branches are permanent and global, did you want a bookmark?)
  $ hg ci -Am 'fork'
  adding b
  $ echo b >> b
  $ hg ci -mb
  $ hg ci --amend --close-branch -m 'closing branch foo'
  saved backup bundle to $TESTTMP/.hg/strip-backup/c962248fa264-amend-backup.hg (glob)

Same thing, different code path:

  $ echo b >> b
  $ hg ci -m 'reopen branch'
  reopening closed branch head 4
  $ echo b >> b
  $ hg ci --amend --close-branch
  saved backup bundle to $TESTTMP/.hg/strip-backup/027371728205-amend-backup.hg (glob)
  $ hg branches
  default                        2:ce12b0b57d46

Refuse to amend during a merge:

  $ hg up -q default
  $ hg merge foo
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  (branch merge, don't forget to commit)
  $ hg ci --amend
  abort: cannot amend while merging
  [255]
  $ hg ci -m 'merge'

Follow copies/renames:

  $ hg mv b c
  $ hg ci -m 'b -> c'
  $ hg mv c d
  $ hg ci --amend -m 'b -> d'
  saved backup bundle to $TESTTMP/.hg/strip-backup/b8c6eac7f12e-amend-backup.hg (glob)
  $ hg st --rev '.^' --copies d
  A d
    b
  $ hg cp d e
  $ hg ci -m 'e = d'
  $ hg cp e f
  $ hg ci --amend -m 'f = d'
  saved backup bundle to $TESTTMP/.hg/strip-backup/7f9761d65613-amend-backup.hg (glob)
  $ hg st --rev '.^' --copies f
  A f
    d

  $ mv f f.orig
  $ hg rm -A f
  $ hg ci -m removef
  $ hg cp a f
  $ mv f.orig f
  $ hg ci --amend -m replacef
  saved backup bundle to $TESTTMP/.hg/strip-backup/9e8c5f7e3d95-amend-backup.hg (glob)
  $ hg st --change . --copies
  $ hg log -r . --template "{file_copies}\n"
  

Move added file (issue3410):

  $ echo g >> g
  $ hg ci -Am g
  adding g
  $ hg mv g h
  $ hg ci --amend
  saved backup bundle to $TESTTMP/.hg/strip-backup/24aa8eacce2b-amend-backup.hg (glob)
  $ hg st --change . --copies h
  A h
  $ hg log -r . --template "{file_copies}\n"
  

Can't rollback an amend:

  $ hg rollback
  no rollback information available
  [1]

Preserve extra dict (issue3430):

  $ hg branch a
  marked working directory as branch a
  (branches are permanent and global, did you want a bookmark?)
  $ echo a >> a
  $ hg ci -ma
  $ hg ci --amend -m "a'"
  saved backup bundle to $TESTTMP/.hg/strip-backup/3837aa2a2fdb-amend-backup.hg (glob)
  $ hg log -r . --template "{branch}\n"
  a
  $ hg ci --amend -m "a''"
  saved backup bundle to $TESTTMP/.hg/strip-backup/c05c06be7514-amend-backup.hg (glob)
  $ hg log -r . --template "{branch}\n"
  a

Also preserve other entries in the dict that are in the old commit,
first graft something so there's an additional entry:

  $ hg up 0 -q
  $ echo z > z
  $ hg ci -Am 'fork'
  adding z
  created new head
  $ hg up 11
  5 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ hg graft 12
  grafting revision 12
  $ hg ci --amend -m 'graft amend'
  saved backup bundle to $TESTTMP/.hg/strip-backup/bd010aea3f39-amend-backup.hg (glob)
  $ hg log -r . --debug | grep extra
  extra:       amend_source=bd010aea3f39f3fb2a2f884b9ccb0471cd77398e
  extra:       branch=a
  extra:       source=2647734878ef0236dda712fae9c1651cf694ea8a

Preserve phase

  $ hg phase '.^::.'
  11: draft
  13: draft
  $ hg phase --secret --force .
  $ hg phase '.^::.'
  11: draft
  13: secret
  $ hg commit --amend -m 'amend for phase' -q
  $ hg phase '.^::.'
  11: draft
  13: secret

Test amend with obsolete
---------------------------

Enable obsolete

  $ cat > ${TESTTMP}/obs.py << EOF
  > import mercurial.obsolete
  > mercurial.obsolete._enabled = True
  > EOF
  $ echo '[extensions]' >> $HGRCPATH
  $ echo "obs=${TESTTMP}/obs.py" >> $HGRCPATH


Amend with no files changes

  $ hg id -n
  13
  $ hg ci --amend -m 'babar'
  $ hg id -n
  14
  $ hg log -Gl 3 --style=compact
  @  14[tip]:11   b650e6ee8614   1970-01-01 00:00 +0000   test
  |    babar
  |
  | o  12:0   2647734878ef   1970-01-01 00:00 +0000   test
  | |    fork
  | |
  o |  11   3334b7925910   1970-01-01 00:00 +0000   test
  | |    a''
  | |
  $ hg log -Gl 4 --hidden --style=compact
  @  14[tip]:11   b650e6ee8614   1970-01-01 00:00 +0000   test
  |    babar
  |
  | x  13:11   68ff8ff97044   1970-01-01 00:00 +0000   test
  |/     amend for phase
  |
  | o  12:0   2647734878ef   1970-01-01 00:00 +0000   test
  | |    fork
  | |
  o |  11   3334b7925910   1970-01-01 00:00 +0000   test
  | |    a''
  | |

Amend with files changes

(note: the extra commit over 15 is a temporary junk I would be happy to get
ride of)

  $ echo 'babar' >> a
  $ hg commit --amend
  $ hg log -Gl 6 --hidden --style=compact
  @  16[tip]:11   9f9e9bccf56c   1970-01-01 00:00 +0000   test
  |    babar
  |
  | x  15   90fef497c56f   1970-01-01 00:00 +0000   test
  | |    temporary amend commit for b650e6ee8614
  | |
  | x  14:11   b650e6ee8614   1970-01-01 00:00 +0000   test
  |/     babar
  |
  | x  13:11   68ff8ff97044   1970-01-01 00:00 +0000   test
  |/     amend for phase
  |
  | o  12:0   2647734878ef   1970-01-01 00:00 +0000   test
  | |    fork
  | |
  o |  11   3334b7925910   1970-01-01 00:00 +0000   test
  | |    a''
  | |


Test that amend does not make it easy to create obsolescence cycle
---------------------------------------------------------------------

  $ hg id -r 14 --hidden
  b650e6ee8614 (a)
  $ hg revert -ar 14 --hidden
  reverting a
  $ hg commit --amend
  $ hg id
  b99e5df575f7 (a) tip

Test that rewriting leaving instability behind is allowed
---------------------------------------------------------------------

  $ hg up '.^'
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ echo 'b' >> a
  $ hg log --style compact -r 'children(.)'
  18[tip]:11   b99e5df575f7   1970-01-01 00:00 +0000   test
    babar
  
  $ hg commit --amend
  $ hg log -r 'unstable()'
  changeset:   18:b99e5df575f7
  branch:      a
  parent:      11:3334b7925910
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     babar
  

Amend a merge changeset (with renames and conflicts from the second parent):

  $ hg up -q default
  $ hg branch -q bar
  $ hg cp a aa
  $ hg mv z zz
  $ echo cc > cc
  $ hg add cc
  $ hg ci -m aazzcc
  $ hg up -q default
  $ echo a >> a
  $ echo dd > cc
  $ hg add cc
  $ hg ci -m aa
  $ hg merge -q bar
  warning: conflicts during merge.
  merging cc incomplete! (edit conflicts, then use 'hg resolve --mark')
  [1]
  $ hg resolve -m cc
  $ hg ci -m 'merge bar'
  $ hg log --config diff.git=1 -pr .
  changeset:   23:d51446492733
  tag:         tip
  parent:      22:30d96aeaf27b
  parent:      21:1aa437659d19
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     merge bar
  
  diff --git a/a b/aa
  copy from a
  copy to aa
  diff --git a/cc b/cc
  --- a/cc
  +++ b/cc
  @@ -1,1 +1,5 @@
  +<<<<<<< local
   dd
  +=======
  +cc
  +>>>>>>> other
  diff --git a/z b/zz
  rename from z
  rename to zz
  
  $ hg debugrename aa
  aa renamed from a:a80d06849b333b8a3d5c445f8ba3142010dcdc9e
  $ hg debugrename zz
  zz renamed from z:69a1b67522704ec122181c0890bd16e9d3e7516a
  $ hg debugrename cc
  cc not renamed
  $ hg ci --amend -m 'merge bar (amend message)'
  $ hg log --config diff.git=1 -pr .
  changeset:   24:59de3dce7a79
  tag:         tip
  parent:      22:30d96aeaf27b
  parent:      21:1aa437659d19
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     merge bar (amend message)
  
  diff --git a/a b/aa
  copy from a
  copy to aa
  diff --git a/cc b/cc
  --- a/cc
  +++ b/cc
  @@ -1,1 +1,5 @@
  +<<<<<<< local
   dd
  +=======
  +cc
  +>>>>>>> other
  diff --git a/z b/zz
  rename from z
  rename to zz
  
  $ hg debugrename aa
  aa renamed from a:a80d06849b333b8a3d5c445f8ba3142010dcdc9e
  $ hg debugrename zz
  zz renamed from z:69a1b67522704ec122181c0890bd16e9d3e7516a
  $ hg debugrename cc
  cc not renamed
  $ hg mv zz z
  $ hg ci --amend -m 'merge bar (undo rename)'
  $ hg log --config diff.git=1 -pr .
  changeset:   26:7fb89c461f81
  tag:         tip
  parent:      22:30d96aeaf27b
  parent:      21:1aa437659d19
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     merge bar (undo rename)
  
  diff --git a/a b/aa
  copy from a
  copy to aa
  diff --git a/cc b/cc
  --- a/cc
  +++ b/cc
  @@ -1,1 +1,5 @@
  +<<<<<<< local
   dd
  +=======
  +cc
  +>>>>>>> other
  
  $ hg debugrename z
  z not renamed

Amend a merge changeset (with renames during the merge):

  $ hg up -q bar
  $ echo x > x
  $ hg add x
  $ hg ci -m x
  $ hg up -q default
  $ hg merge -q bar
  $ hg mv aa aaa
  $ echo aa >> aaa
  $ hg ci -m 'merge bar again'
  $ hg log --config diff.git=1 -pr .
  changeset:   28:982d7a34ffee
  tag:         tip
  parent:      26:7fb89c461f81
  parent:      27:4c94d5bc65f5
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     merge bar again
  
  diff --git a/aa b/aa
  deleted file mode 100644
  --- a/aa
  +++ /dev/null
  @@ -1,2 +0,0 @@
  -a
  -a
  diff --git a/aaa b/aaa
  new file mode 100644
  --- /dev/null
  +++ b/aaa
  @@ -0,0 +1,3 @@
  +a
  +a
  +aa
  diff --git a/x b/x
  new file mode 100644
  --- /dev/null
  +++ b/x
  @@ -0,0 +1,1 @@
  +x
  
  $ hg debugrename aaa
  aaa renamed from aa:37d9b5d994eab34eda9c16b195ace52c7b129980
  $ hg mv aaa aa
  $ hg ci --amend -m 'merge bar again (undo rename)'
  $ hg log --config diff.git=1 -pr .
  changeset:   30:522688c0e71b
  tag:         tip
  parent:      26:7fb89c461f81
  parent:      27:4c94d5bc65f5
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     merge bar again (undo rename)
  
  diff --git a/aa b/aa
  --- a/aa
  +++ b/aa
  @@ -1,2 +1,3 @@
   a
   a
  +aa
  diff --git a/x b/x
  new file mode 100644
  --- /dev/null
  +++ b/x
  @@ -0,0 +1,1 @@
  +x
  
  $ hg debugrename aa
  aa not renamed
  $ hg debugrename -r '.^' aa
  aa renamed from a:a80d06849b333b8a3d5c445f8ba3142010dcdc9e

Amend a merge changeset (with manifest-level conflicts):

  $ hg up -q bar
  $ hg rm aa
  $ hg ci -m 'rm aa'
  $ hg up -q default
  $ echo aa >> aa
  $ hg ci -m aa
  $ hg merge -q bar
  local changed aa which remote deleted
  use (c)hanged version or (d)elete? c
  $ hg ci -m 'merge bar (with conflicts)'
  $ hg log --config diff.git=1 -pr .
  changeset:   33:5f9904c491b8
  tag:         tip
  parent:      32:01780b896f58
  parent:      31:67db8847a540
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     merge bar (with conflicts)
  
  
  $ hg rm aa
  $ hg ci --amend -m 'merge bar (with conflicts, amended)'
  $ hg log --config diff.git=1 -pr .
  changeset:   35:6ce0c89781a3
  tag:         tip
  parent:      32:01780b896f58
  parent:      31:67db8847a540
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     merge bar (with conflicts, amended)
  
  diff --git a/aa b/aa
  deleted file mode 100644
  --- a/aa
  +++ /dev/null
  @@ -1,4 +0,0 @@
  -a
  -a
  -aa
  -aa