annotate tests/test-amend-patch.t @ 5926:aca07ac01167

divergence-resolution: use last evolution date to choose p1 when merging

Before this patch, we choose the minimum revision as p1 while merging the
two divergent csets which had a drawback that if independent user resolve
the same divergence, their final resolved cset would have different hashes
(because of 'divergence_source_local' and 'divergence_source_other' extras).

Now, we decide the p1 on the basis of which of the two divergent cset
was rewritten more recently. This new logic removes the "different hash"
problem.

To save us from big output changes in the tests due to this change, I also
added the second factor i.e revision_number while sorting the csets wrt dates
(as date is same for all the csets in tests) to fallback to the old way of
picking the revision i.e choosing the minimum rev number.

And to demonstrate that now divergence resolution is independent of which
side user run the `hg evolve --content-div` resolved cset id won't change,
I have added a separate test file.
Flag --config devel.default-date='...' is being used here to record a
custom date in the obsmarkers.

** Test for the `--patch` flag for `hg amend` command **

Setup

  $ cat >> $HGRCPATH << EOF
  > [alias]
  > glog = log -GT "{rev}:{node|short} {desc}\n ({bookmarks}) {phase}"
  > [diff]
  > git = 1
  > [extensions]
  > EOF
  $ echo "evolve=$(echo $(dirname $TESTDIR))/hgext3rd/evolve/" >> $HGRCPATH

Reposetup

  $ hg init repo
  $ cd repo
  $ echo foo > a
  $ hg ci -Aqm "added a"
  $ hg exp
  # HG changeset patch
  # User test
  # Date 0 0
  #      Thu Jan 01 00:00:00 1970 +0000
  # Node ID f7ad4196431346de3c33c52e75374fba45e04313
  # Parent  0000000000000000000000000000000000000000
  added a
  
  diff --git a/a b/a
  new file mode 100644
  --- /dev/null
  +++ b/a
  @@ -0,0 +1,1 @@
  +foo

Testing of just changing the diff, not the patch metadata
==========================================================

Testing the normal case
-----------------------

  $ cat > editor.sh <<EOF
  > #!/bin/sh
  > cat > \$1 <<ENDOF
  > # HG changeset patch
  > # User test
  > # Date 0 0
  > #      Thu Jan 01 00:00:00 1970 +0000
  > # Node ID f7ad4196431346de3c33c52e75374fba45e04313
  > # Parent  0000000000000000000000000000000000000000
  > added a
  > diff --git a/a b/a
  > new file mode 100644
  > --- /dev/null
  > +++ b/a
  > @@ -0,0 +1,1 @@
  > +Gello
  > ENDOF
  > EOF

  $ HGEDITOR="sh ./editor.sh" hg amend --patch

Making sure the amended commit is correct

  $ hg exp
  # HG changeset patch
  # User test
  # Date 0 0
  #      Thu Jan 01 00:00:00 1970 +0000
  # Node ID af624b221c0c0bec5d74e2650180dd3eddcb7c42
  # Parent  0000000000000000000000000000000000000000
  added a
  
  diff --git a/a b/a
  new file mode 100644
  --- /dev/null
  +++ b/a
  @@ -0,0 +1,1 @@
  +Gello

  $ hg glog
  @  1:af624b221c0c added a
      () draft

Obsolsence history is fine

  $ hg debugobsolete
  f7ad4196431346de3c33c52e75374fba45e04313 af624b221c0c0bec5d74e2650180dd3eddcb7c42 0 (Thu Jan 01 00:00:00 1970 +0000) {'ef1': '8', 'operation': 'amend', 'user': 'test'}
  $ hg obslog -p -r .
  @  af624b221c0c (1) added a
  |    amended(content) from f7ad41964313 using amend by test (Thu Jan 01 00:00:00 1970 +0000)
  |      diff --git a/a b/a
  |      --- a/a
  |      +++ b/a
  |      @@ -1,1 +1,1 @@
  |      -foo
  |      +Gello
  |
  |
  x  f7ad41964313 (0) added a
  
Diff and status are good too
  $ hg diff
  $ hg status
  ? editor.sh
  $ cat a
  Gello

Dirstate parents should be correctly set
  $ hg parents
  changeset:   1:af624b221c0c
  tag:         tip
  parent:      -1:000000000000
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     added a
  
Trying to amend with a wrong patch
----------------------------------

Having context which was is not present

  $ cat > editor.sh <<EOF
  > #!/bin/sh
  > cat > \$1 <<ENDOF
  > # HG changeset patch
  > # User test
  > # Date 0 0
  > #      Thu Jan 01 00:00:00 1970 +0000
  > # Node ID c6ba250efbf73e671f2ca24b79db2c178ccbfff9
  > # Parent  0000000000000000000000000000000000000000
  > added a
  > diff --git a/a b/a
  > new file mode 100644
  > --- /dev/null
  > +++ b/a
  > @@ -0,0 +1,1 @@
  > I was not there before!
  > +Gello
  > ENDOF
  > EOF

  $ HGEDITOR="sh ./editor.sh" hg amend --patch
  failed to apply edited patch: bad hunk #1 @@ -0,0 +1,1 @@
   (1 0 1 1)
  try to fix the patch (yn)? y
  abort: patch unchanged
  [255]

Having deletions which dont exists

  $ cat > editor.sh <<EOF
  > #!/bin/sh
  > cat > \$1 <<ENDOF
  > # HG changeset patch
  > # User test
  > # Date 0 0
  > #      Thu Jan 01 00:00:00 1970 +0000
  > # Node ID af624b221c0c0bec5d74e2650180dd3eddcb7c42
  > # Parent  0000000000000000000000000000000000000000
  > added a
  > diff --git a/a b/a
  > new file mode 100644
  > --- /dev/null
  > +++ b/a
  > @@ -0,0 +1,1 @@
  > -I was not deleted before!
  > +Gello
  > ENDOF
  > EOF

  $ HGEDITOR="sh ./editor.sh" hg amend --patch
  failed to apply edited patch: bad hunk #1 @@ -0,0 +1,1 @@
   (1 0 1 1)
  try to fix the patch (yn)? y
  abort: patch unchanged
  [255]

Changing the file mode using amend --patch
------------------------------------------

  $ cat > editor.sh <<EOF
  > #!/bin/sh
  > cat > \$1 <<ENDOF
  > # HG changeset patch
  > # User test
  > # Date 0 0
  > #      Thu Jan 01 00:00:00 1970 +0000
  > # Node ID af624b221c0c0bec5d74e2650180dd3eddcb7c42
  > # Parent  0000000000000000000000000000000000000000
  > added a
  > diff --git a/a b/a
  > new file mode 100755
  > --- /dev/null
  > +++ b/a
  > @@ -0,0 +1,1 @@
  > +Gello
  > ENDOF
  > EOF

  $ HGEDITOR="sh ./editor.sh" hg amend --patch

  $ hg exp --git
  # HG changeset patch
  # User test
  # Date 0 0
  #      Thu Jan 01 00:00:00 1970 +0000
  # Node ID 3a99e4b7ac73da799e20ae56914e3dd5b1a22d4d
  # Parent  0000000000000000000000000000000000000000
  added a
  
  diff --git a/a b/a
  new file mode 100755
  --- /dev/null
  +++ b/a
  @@ -0,0 +1,1 @@
  +Gello

Changing the file using amend --patch
-------------------------------------

  $ cat > editor.sh <<EOF
  > #!/bin/sh
  > cat > \$1 <<ENDOF
  > # HG changeset patch
  > # User test
  > # Date 0 0
  > #      Thu Jan 01 00:00:00 1970 +0000
  > # Node ID 3a99e4b7ac73da799e20ae56914e3dd5b1a22d4d
  > # Parent  0000000000000000000000000000000000000000
  > added a
  > diff --git a/changedfile b/changedfile
  > new file mode 100755
  > --- /dev/null
  > +++ b/changedfile
  > @@ -0,0 +1,1 @@
  > +Gello
  > ENDOF
  > EOF

  $ HGEDITOR="sh ./editor.sh" hg amend --patch

  $ hg exp
  # HG changeset patch
  # User test
  # Date 0 0
  #      Thu Jan 01 00:00:00 1970 +0000
  # Node ID fc57c20be380f2878f4db139dad66d6cfb42ec62
  # Parent  0000000000000000000000000000000000000000
  added a
  
  diff --git a/changedfile b/changedfile
  new file mode 100755
  --- /dev/null
  +++ b/changedfile
  @@ -0,0 +1,1 @@
  +Gello

  $ hg status -A
  ? editor.sh
  C changedfile

Handling both deletions and additions
-------------------------------------

  $ echo foobar > changedfile
  $ hg ci -m "foobar to changedfile"
  $ hg exp
  # HG changeset patch
  # User test
  # Date 0 0
  #      Thu Jan 01 00:00:00 1970 +0000
  # Node ID 7969f70ffb81c3a6eee2d4f2f7032b694ce05349
  # Parent  fc57c20be380f2878f4db139dad66d6cfb42ec62
  foobar to changedfile
  
  diff --git a/changedfile b/changedfile
  --- a/changedfile
  +++ b/changedfile
  @@ -1,1 +1,1 @@
  -Gello
  +foobar

  $ cat > editor.sh <<EOF
  > #!/bin/sh
  > cat > \$1 <<ENDOF
  > # HG changeset patch
  > # User test
  > # Date 0 0
  > #      Thu Jan 01 00:00:00 1970 +0000
  > # Node ID 7969f70ffb81c3a6eee2d4f2f7032b694ce05349
  > # Parent  fc57c20be380f2878f4db139dad66d6cfb42ec62
  > foobar to changedfile
  > diff --git a/changedfile b/changedfile
  > --- a/changedfile
  > +++ b/changedfile
  > @@ -1,1 +1,1 @@
  > -Gello
  > +foobar
  > ENDOF
  > EOF

  $ HGEDITOR="sh ./editor.sh" hg amend --patch
  abort: nothing changed
  [255]

Cannot change lines which are deleted

  $ cat > editor.sh <<EOF
  > #!/bin/sh
  > cat > \$1 <<ENDOF
  > # HG changeset patch
  > # User test
  > # Date 0 0
  > #      Thu Jan 01 00:00:00 1970 +0000
  > # Node ID 7969f70ffb81c3a6eee2d4f2f7032b694ce05349
  > # Parent  fc57c20be380f2878f4db139dad66d6cfb42ec62
  > foobar to changedfile
  > diff --git a/changedfile b/changedfile
  > --- a/changedfile
  > +++ b/changedfile
  > @@ -1,1 +1,1 @@
  > -Hello
  > +foobar
  > ENDOF
  > EOF

  $ HGEDITOR="sh ./editor.sh" hg amend --patch
  patching file changedfile
  Hunk #1 FAILED at 0
  failed to apply edited patch: patch failed to apply
  try to fix the patch (yn)? y
  abort: patch unchanged
  [255]

Add more addition to the patch

  $ cat > editor.sh <<EOF
  > #!/bin/sh
  > cat > \$1 <<ENDOF
  > # HG changeset patch
  > # User test
  > # Date 0 0
  > #      Thu Jan 01 00:00:00 1970 +0000
  > # Node ID 7969f70ffb81c3a6eee2d4f2f7032b694ce05349
  > # Parent  fc57c20be380f2878f4db139dad66d6cfb42ec62
  > foobar to changedfile
  > diff --git a/changedfile b/changedfile
  > --- a/changedfile
  > +++ b/changedfile
  > @@ -1,1 +1,2 @@
  > -Gello
  > +foobar
  > +babar
  > ENDOF
  > EOF

  $ HGEDITOR="sh ./editor.sh" hg amend --patch

  $ hg exp
  # HG changeset patch
  # User test
  # Date 0 0
  #      Thu Jan 01 00:00:00 1970 +0000
  # Node ID 5d54400acb70b88f07128a1df497ed794b0b177b
  # Parent  fc57c20be380f2878f4db139dad66d6cfb42ec62
  foobar to changedfile
  
  diff --git a/changedfile b/changedfile
  --- a/changedfile
  +++ b/changedfile
  @@ -1,1 +1,2 @@
  -Gello
  +foobar
  +babar

  $ cat changedfile
  foobar
  babar

Introduce files which were not there
------------------------------------

  $ cat > editor.sh <<EOF
  > #!/bin/sh
  > cat > \$1 <<ENDOF
  > # HG changeset patch
  > # User test
  > # Date 0 0
  > #      Thu Jan 01 00:00:00 1970 +0000
  > # Node ID 5d54400acb70b88f07128a1df497ed794b0b177b
  > # Parent  fc57c20be380f2878f4db139dad66d6cfb42ec62
  > foobar to changedfile
  > diff --git a/changedfile b/changedfile
  > --- a/changedfile
  > +++ b/changedfile
  > @@ -1,1 +1,2 @@
  > -Gello
  > +foobar
  > +babar
  > diff --git a/a b/a
  > new file mode 100755
  > --- /dev/null
  > +++ b/a
  > @@ -0,0 +1,1 @@
  > +Gello
  > ENDOF
  > EOF

  $ HGEDITOR="sh ./editor.sh" hg amend --patch

  $ hg exp
  # HG changeset patch
  # User test
  # Date 0 0
  #      Thu Jan 01 00:00:00 1970 +0000
  # Node ID c3e29c061982c94418ce141d521434d6da76cd46
  # Parent  fc57c20be380f2878f4db139dad66d6cfb42ec62
  foobar to changedfile
  
  diff --git a/a b/a
  new file mode 100755
  --- /dev/null
  +++ b/a
  @@ -0,0 +1,1 @@
  +Gello
  diff --git a/changedfile b/changedfile
  --- a/changedfile
  +++ b/changedfile
  @@ -1,1 +1,2 @@
  -Gello
  +foobar
  +babar

Delete files which were not deleted in the first place
------------------------------------------------------

  $ echo Hello >> a
  $ hg ci -m "hello to a"
  $ hg glog
  @  7:3d62c45a1699 hello to a
  |   () draft
  o  6:c3e29c061982 foobar to changedfile
  |   () draft
  o  3:fc57c20be380 added a
      () draft

  $ cat > editor.sh <<EOF
  > #!/bin/sh
  > cat > \$1 <<ENDOF
  > # HG changeset patch
  > # User test
  > # Date 0 0
  > #      Thu Jan 01 00:00:00 1970 +0000
  > # Node ID 3d62c45a1699b11c7ecae573f013601712f2cc5f
  > # Parent  c3e29c061982c94418ce141d521434d6da76cd46
  > hello to a
  > diff --git a/a b/a
  > --- a/a
  > +++ b/a
  > @@ -1,1 +1,2 @@
  >  Gello
  > +Hello
  > diff --git a/changedfile b/changedfile
  > deleted file mode 100755
  > --- a/changedfile
  > +++ /dev/null
  > @@ -1,2 +0,0 @@
  > -foobar
  > -babar
  > ENDOF
  > EOF

  $ HGEDITOR="sh ./editor.sh" hg amend --patch

  $ hg exp
  # HG changeset patch
  # User test
  # Date 0 0
  #      Thu Jan 01 00:00:00 1970 +0000
  # Node ID c9875799c53fb862c0dbaf01500459c9397373a4
  # Parent  c3e29c061982c94418ce141d521434d6da76cd46
  hello to a
  
  diff --git a/a b/a
  --- a/a
  +++ b/a
  @@ -1,1 +1,2 @@
   Gello
  +Hello
  diff --git a/changedfile b/changedfile
  deleted file mode 100755
  --- a/changedfile
  +++ /dev/null
  @@ -1,2 +0,0 @@
  -foobar
  -babar

  $ hg status
  ? editor.sh

  $ cat changedfile
  cat: changedfile: No such file or directory
  [1]

Testing sercret phase preservation during `hg amend --patch`
------------------------------------------------------------

  $ hg phase -r . --secret --force

  $ hg phase -r .
  8: secret

  $ cat > editor.sh <<EOF
  > #!/bin/sh
  > cat > \$1 <<ENDOF
  > # HG changeset patch
  > # User test
  > # Date 0 0
  > #      Thu Jan 01 00:00:00 1970 +0000
  > # Node ID c9875799c53fb862c0dbaf01500459c9397373a4
  > # Parent  c3e29c061982c94418ce141d521434d6da76cd46
  > hello to a
  > diff --git a/a b/a
  > --- a/a
  > +++ b/a
  > @@ -1,1 +1,3 @@
  >  Gello
  > +Hello
  > +mello
  > diff --git a/changedfile b/changedfile
  > deleted file mode 100755
  > --- a/changedfile
  > +++ /dev/null
  > @@ -1,2 +0,0 @@
  > -foobar
  > -babar
  > ENDOF
  > EOF

  $ HGEDITOR="sh ./editor.sh" hg amend --patch

  $ hg exp
  # HG changeset patch
  # User test
  # Date 0 0
  #      Thu Jan 01 00:00:00 1970 +0000
  # Node ID 4414485658e719a1f3d5e58bc8b2412385aa1592
  # Parent  c3e29c061982c94418ce141d521434d6da76cd46
  hello to a
  
  diff --git a/a b/a
  --- a/a
  +++ b/a
  @@ -1,1 +1,3 @@
   Gello
  +Hello
  +mello
  diff --git a/changedfile b/changedfile
  deleted file mode 100755
  --- a/changedfile
  +++ /dev/null
  @@ -1,2 +0,0 @@
  -foobar
  -babar

  $ hg phase -r .
  9: secret

Testing bookmark movement on amend --patch
------------------------------------------

  $ hg bookmark foo
  $ hg glog
  @  9:4414485658e7 hello to a
  |   (foo) secret
  o  6:c3e29c061982 foobar to changedfile
  |   () draft
  o  3:fc57c20be380 added a
      () draft

  $ cat > editor.sh <<EOF
  > #!/bin/sh
  > cat > \$1 <<ENDOF
  > # HG changeset patch
  > # User test
  > # Date 0 0
  > #      Thu Jan 01 00:00:00 1970 +0000
  > # Node ID 4414485658e719a1f3d5e58bc8b2412385aa1592
  > # Parent  c3e29c061982c94418ce141d521434d6da76cd46
  > hello to a
  > diff --git a/a b/a
  > --- a/a
  > +++ b/a
  > @@ -1,1 +1,3 @@
  >  Gello
  > +Hello
  > +bello
  > diff --git a/changedfile b/changedfile
  > deleted file mode 100755
  > --- a/changedfile
  > +++ /dev/null
  > @@ -1,2 +0,0 @@
  > -foobar
  > -babar
  > ENDOF
  > EOF

  $ HGEDITOR="sh ./editor.sh" hg amend --patch

  $ hg exp
  # HG changeset patch
  # User test
  # Date 0 0
  #      Thu Jan 01 00:00:00 1970 +0000
  # Node ID 36454bda1fdb8e2e4fe07bb084eef378e29cba74
  # Parent  c3e29c061982c94418ce141d521434d6da76cd46
  hello to a
  
  diff --git a/a b/a
  --- a/a
  +++ b/a
  @@ -1,1 +1,3 @@
   Gello
  +Hello
  +bello
  diff --git a/changedfile b/changedfile
  deleted file mode 100755
  --- a/changedfile
  +++ /dev/null
  @@ -1,2 +0,0 @@
  -foobar
  -babar

  $ hg glog
  @  10:36454bda1fdb hello to a
  |   (foo) secret
  o  6:c3e29c061982 foobar to changedfile
  |   () draft
  o  3:fc57c20be380 added a
      () draft

Trying to amend --patch a public changeset
------------------------------------------

  $ hg phase -r . --public
  $ hg glog
  @  10:36454bda1fdb hello to a
  |   (foo) public
  o  6:c3e29c061982 foobar to changedfile
  |   () public
  o  3:fc57c20be380 added a
      () public

  $ HGEDITOR=cat hg amend --patch
  abort: cannot amend public changesets: 36454bda1fdb
  (see 'hg help phases' for details)
  [255]

  $ hg phase -r . --draft --force

Trying on a dirty working directory
-------------------------------------

  $ echo bar > bar
  $ hg add bar
  $ HGEDITOR=cat hg amend --patch
  abort: uncommitted changes
  [20]

  $ hg revert --all
  forgetting bar

Trying to pass filenames, only mentioned file names should be popped up in
editor and rest should stay in the commit as they were
--------------------------------------------------------------------------

Checking the we pop-up with the files which were mentioned

  $ HGEDITOR=cat hg amend --patch changedfile
  # HG changeset patch
  # User test
  # Date 0 0
  #      Thu Jan 01 00:00:00 1970 +0000
  # Node ID 36454bda1fdb8e2e4fe07bb084eef378e29cba74
  # Parent  c3e29c061982c94418ce141d521434d6da76cd46
  hello to a
  
  diff --git a/changedfile b/changedfile
  deleted file mode 100755
  --- a/changedfile
  +++ /dev/null
  @@ -1,2 +0,0 @@
  -foobar
  -babar
  abort: nothing changed
  [255]

  $ HGEDITOR=cat hg amend --patch a
  # HG changeset patch
  # User test
  # Date 0 0
  #      Thu Jan 01 00:00:00 1970 +0000
  # Node ID 36454bda1fdb8e2e4fe07bb084eef378e29cba74
  # Parent  c3e29c061982c94418ce141d521434d6da76cd46
  hello to a
  
  diff --git a/a b/a
  --- a/a
  +++ b/a
  @@ -1,1 +1,3 @@
   Gello
  +Hello
  +bello
  abort: nothing changed
  [255]

  $ HGEDITOR=cat hg amend --patch changedfile a
  # HG changeset patch
  # User test
  # Date 0 0
  #      Thu Jan 01 00:00:00 1970 +0000
  # Node ID 36454bda1fdb8e2e4fe07bb084eef378e29cba74
  # Parent  c3e29c061982c94418ce141d521434d6da76cd46
  hello to a
  
  diff --git a/a b/a
  --- a/a
  +++ b/a
  @@ -1,1 +1,3 @@
   Gello
  +Hello
  +bello
  diff --git a/changedfile b/changedfile
  deleted file mode 100755
  --- a/changedfile
  +++ /dev/null
  @@ -1,2 +0,0 @@
  -foobar
  -babar
  abort: patch unchanged
  [255]

  $ HGEDITOR=cat hg amend --patch doesnotexists
  # HG changeset patch
  # User test
  # Date 0 0
  #      Thu Jan 01 00:00:00 1970 +0000
  # Node ID 36454bda1fdb8e2e4fe07bb084eef378e29cba74
  # Parent  c3e29c061982c94418ce141d521434d6da76cd46
  hello to a
  
  abort: nothing changed
  [255]

Changing only one file
  $ cat > editor.sh <<EOF
  > #!/bin/sh
  > cat > \$1 <<ENDOF
  > # HG changeset patch
  > # User test
  > # Date 0 0
  > #      Thu Jan 01 00:00:00 1970 +0000
  > # Node ID 36454bda1fdb8e2e4fe07bb084eef378e29cba74
  > # Parent  c3e29c061982c94418ce141d521434d6da76cd46
  > hello to a
  > diff --git a/a b/a
  > --- a/a
  > +++ b/a
  > @@ -1,1 +1,3 @@
  >  Gello
  > +Hello
  > +betto
  > ENDOF
  > EOF

  $ HGEDITOR="sh ./editor.sh" hg amend --patch a

file 'a' should be amended, rest of them should remain unchanged

  $ hg exp
  # HG changeset patch
  # User test
  # Date 0 0
  #      Thu Jan 01 00:00:00 1970 +0000
  # Node ID ea175dcc4ee38c106db157975e006b4092444c65
  # Parent  c3e29c061982c94418ce141d521434d6da76cd46
  hello to a
  
  diff --git a/a b/a
  --- a/a
  +++ b/a
  @@ -1,1 +1,3 @@
   Gello
  +Hello
  +betto
  diff --git a/changedfile b/changedfile
  deleted file mode 100755
  --- a/changedfile
  +++ /dev/null
  @@ -1,2 +0,0 @@
  -foobar
  -babar

  $ hg status
  ? bar
  ? editor.sh

  $ hg diff

Testing again with file 'changedfile'

  $ cat > editor.sh <<EOF
  > #!/bin/sh
  > cat > \$1 <<ENDOF
  > # HG changeset patch
  > # User test
  > # Date 0 0
  > #      Thu Jan 01 00:00:00 1970 +0000
  > # Node ID ea175dcc4ee38c106db157975e006b4092444c65
  > # Parent  c3e29c061982c94418ce141d521434d6da76cd46
  > hello to a
  > diff --git a/changedfile b/changedfile
  > --- a/changedfile
  > +++ b/changedfile
  > @@ -1,2 +1,1 @@
  >  foobar
  > -babar
  > ENDOF
  > EOF

  $ HGEDITOR="sh ./editor.sh" hg amend --patch changedfile

  $ hg exp
  # HG changeset patch
  # User test
  # Date 0 0
  #      Thu Jan 01 00:00:00 1970 +0000
  # Node ID 0e64d76c3519308c398a28192cb095d48b29aede
  # Parent  c3e29c061982c94418ce141d521434d6da76cd46
  hello to a
  
  diff --git a/a b/a
  --- a/a
  +++ b/a
  @@ -1,1 +1,3 @@
   Gello
  +Hello
  +betto
  diff --git a/changedfile b/changedfile
  --- a/changedfile
  +++ b/changedfile
  @@ -1,2 +1,1 @@
   foobar
  -babar

  $ hg diff
  $ hg status
  ? bar
  ? editor.sh

Dropping a file from commit by removing related hunks
------------------------------------------------------

  $ cat > editor.sh <<EOF
  > #!/bin/sh
  > cat > \$1 <<ENDOF
  > # HG changeset patch
  > # User test
  > # Date 0 0
  > #      Thu Jan 01 00:00:00 1970 +0000
  > # Node ID 0e64d76c3519308c398a28192cb095d48b29aede
  > # Parent  c3e29c061982c94418ce141d521434d6da76cd46
  > hello to a
  > diff --git a/a b/a
  > --- a/a
  > +++ b/a
  > @@ -1,1 +1,3 @@
  >  Gello
  > +Kello
  > +betto
  > ENDOF
  > EOF

  $ HGEDITOR="sh ./editor.sh" hg amend --patch

  $ hg exp
  # HG changeset patch
  # User test
  # Date 0 0
  #      Thu Jan 01 00:00:00 1970 +0000
  # Node ID 944e9f65fa55fdb2de98577c9d8ab30de0927d8e
  # Parent  c3e29c061982c94418ce141d521434d6da76cd46
  hello to a
  
  diff --git a/a b/a
  --- a/a
  +++ b/a
  @@ -1,1 +1,3 @@
   Gello
  +Kello
  +betto

The part which was dropped from the patch will not be there in working directory
too
  $ hg diff

  $ hg status
  ? bar
  ? editor.sh

Changing metadata of a patch by editing patch content
======================================================

Changing user
-------------

  $ cat > editor.sh <<EOF
  > #!/bin/sh
  > cat > \$1 <<ENDOF
  > # HG changeset patch
  > # User RandomUser
  > # Date 0 0
  > #      Thu Jan 01 00:00:00 1970 +0000
  > # Node ID 944e9f65fa55fdb2de98577c9d8ab30de0927d8e
  > # Parent  c3e29c061982c94418ce141d521434d6da76cd46
  > hello to a
  > diff --git a/a b/a
  > --- a/a
  > +++ b/a
  > @@ -1,1 +1,3 @@
  >  Gello
  > +Kello
  > +betto
  > ENDOF
  > EOF

  $ HGEDITOR="sh ./editor.sh" hg amend --patch

  $ hg exp
  # HG changeset patch
  # User RandomUser
  # Date 0 0
  #      Thu Jan 01 00:00:00 1970 +0000
  # Node ID 5ded18a8c333a55da4b0e051162457cfe5d85558
  # Parent  c3e29c061982c94418ce141d521434d6da76cd46
  hello to a
  
  diff --git a/a b/a
  --- a/a
  +++ b/a
  @@ -1,1 +1,3 @@
   Gello
  +Kello
  +betto

Changing Date
-------------

  $ cat > editor.sh <<EOF
  > #!/bin/sh
  > cat > \$1 <<ENDOF
  > # HG changeset patch
  > # User RandomUser
  > # Date 123456 1200
  > #      Thu Jan 01 00:00:00 1970 +0000
  > # Node ID 944e9f65fa55fdb2de98577c9d8ab30de0927d8e
  > # Parent  c3e29c061982c94418ce141d521434d6da76cd46
  > hello to a
  > diff --git a/a b/a
  > --- a/a
  > +++ b/a
  > @@ -1,1 +1,3 @@
  >  Gello
  > +Kello
  > +betto
  > ENDOF
  > EOF

  $ HGEDITOR="sh ./editor.sh" hg amend --patch

  $ hg exp
  # HG changeset patch
  # User RandomUser
  # Date 123456 1200
  #      Fri Jan 02 09:57:36 1970 -0020
  # Node ID e2312ddcd8756665075a60bd05431ddca3c45050
  # Parent  c3e29c061982c94418ce141d521434d6da76cd46
  hello to a
  
  diff --git a/a b/a
  --- a/a
  +++ b/a
  @@ -1,1 +1,3 @@
   Gello
  +Kello
  +betto

Changing branch
---------------

  $ cat > editor.sh <<EOF
  > #!/bin/sh
  > cat > \$1 <<ENDOF
  > # HG changeset patch
  > # User RandomUser
  > # Date 123456 1200
  > #      Thu Jan 01 00:00:00 1970 +0000
  > # Branch stable
  > # Node ID 944e9f65fa55fdb2de98577c9d8ab30de0927d8e
  > # Parent  c3e29c061982c94418ce141d521434d6da76cd46
  > hello to a
  > diff --git a/a b/a
  > --- a/a
  > +++ b/a
  > @@ -1,1 +1,3 @@
  >  Gello
  > +Kello
  > +betto
  > ENDOF
  > EOF

  $ HGEDITOR="sh ./editor.sh" hg amend --patch

  $ hg exp
  # HG changeset patch
  # User RandomUser
  # Date 123456 1200
  #      Fri Jan 02 09:57:36 1970 -0020
  # Branch stable
  # Node ID ddc61a4058687b2dd4a316f4b5fe7d52a35b702a
  # Parent  c3e29c061982c94418ce141d521434d6da76cd46
  hello to a
  
  diff --git a/a b/a
  --- a/a
  +++ b/a
  @@ -1,1 +1,3 @@
   Gello
  +Kello
  +betto

Changing parent (this should be fun)
------------------------------------

  $ hg glog
  @  16:ddc61a405868 hello to a
  |   (foo) draft
  o  6:c3e29c061982 foobar to changedfile
  |   () public
  o  3:fc57c20be380 added a
      () public

  $ hg log -r .^^ -T '{node}'
  fc57c20be380f2878f4db139dad66d6cfb42ec62 (no-eol)

  $ cat > editor.sh <<EOF
  > #!/bin/sh
  > cat > \$1 <<ENDOF
  > # HG changeset patch
  > # User RandomUser
  > # Date 123456 1200
  > #      Thu Jan 01 00:00:00 1970 +0000
  > # Branch stable
  > # Node ID 944e9f65fa55fdb2de98577c9d8ab30de0927d8e
  > # Parent  fc57c20be380f2878f4db139dad66d6cfb42ec62
  > hello to a
  > diff --git a/a b/a
  > --- a/a
  > +++ b/a
  > @@ -1,1 +1,3 @@
  >  Gello
  > +Kello
  > +betto
  > ENDOF
  > EOF

  $ HGEDITOR="sh ./editor.sh" hg amend --patch

  $ hg exp
  # HG changeset patch
  # User RandomUser
  # Date 123456 1200
  #      Fri Jan 02 09:57:36 1970 -0020
  # Branch stable
  # Node ID b763f7cb2302f2efa1275e2a9202655872c9567f
  # Parent  fc57c20be380f2878f4db139dad66d6cfb42ec62
  hello to a
  
  diff --git a/a b/a
  new file mode 100755
  --- /dev/null
  +++ b/a
  @@ -0,0 +1,3 @@
  +Gello
  +Kello
  +betto

  $ hg glog
  @  17:b763f7cb2302 hello to a
  |   (foo) draft
  | o  6:c3e29c061982 foobar to changedfile
  |/    () public
  o  3:fc57c20be380 added a
      () public

Changing the commit desciption
-------------------------------

  $ cat > editor.sh <<EOF
  > #!/bin/sh
  > cat > \$1 <<ENDOF
  > # HG changeset patch
  > # User RandomUser
  > # Date 123456 1200
  > #      Thu Jan 01 00:00:00 1970 +0000
  > # Branch stable
  > # Node ID 944e9f65fa55fdb2de98577c9d8ab30de0927d8e
  > # Parent  fc57c20be380f2878f4db139dad66d6cfb42ec62
  > I am a message which is testing change of message
  > diff --git a/a b/a
  > new file mode 100755
  > --- /dev/null
  > +++ b/a
  > @@ -0,0 +1,3 @@
  > +Gello
  > +Kello
  > +betto
  > ENDOF
  > EOF

  $ HGEDITOR="sh ./editor.sh" hg amend --patch

  $ hg exp
  # HG changeset patch
  # User RandomUser
  # Date 123456 1200
  #      Fri Jan 02 09:57:36 1970 -0020
  # Branch stable
  # Node ID f14ecd7121e63915ac93edbad7f60f605e62dd52
  # Parent  fc57c20be380f2878f4db139dad66d6cfb42ec62
  I am a message which is testing change of message
  
  diff --git a/a b/a
  new file mode 100755
  --- /dev/null
  +++ b/a
  @@ -0,0 +1,3 @@
  +Gello
  +Kello
  +betto

Changing the Node ID of the patch
---------------------------------

Nothing happens in that case we dont care about the node ID. Look the above 3-4
tests to realize I was testing that too.

Aborting by passing an empty patch file (issue5925)
---------------------------------------------------

  $ cat > editor.sh <<EOF
  > #!/bin/sh
  > cat > \$1 <<ENDOF
  > ENDOF
  > EOF

  $ HGEDITOR="sh ./editor.sh" hg amend --patch
  abort: empty patch file, amend aborted
  [255]

  $ hg exp
  # HG changeset patch
  # User RandomUser
  # Date 123456 1200
  #      Fri Jan 02 09:57:36 1970 -0020
  # Branch stable
  # Node ID f14ecd7121e63915ac93edbad7f60f605e62dd52
  # Parent  fc57c20be380f2878f4db139dad66d6cfb42ec62
  I am a message which is testing change of message
  
  diff --git a/a b/a
  new file mode 100755
  --- /dev/null
  +++ b/a
  @@ -0,0 +1,3 @@
  +Gello
  +Kello
  +betto

  $ hg parents
  changeset:   18:f14ecd7121e6
  branch:      stable
  bookmark:    foo
  tag:         tip
  parent:      3:fc57c20be380
  user:        RandomUser
  date:        Fri Jan 02 09:57:36 1970 -0020
  summary:     I am a message which is testing change of message