view tests/test-histedit-fold.t @ 32697:19b9fc40cc51

revlog: skeleton support for version 2 revlogs

There are a number of improvements we want to make to revlogs
that will require a new version - version 2. It is unclear what the
full set of improvements will be or when we'll be done with them.
What I do know is that the process will likely take longer than a
single release, will require input from various stakeholders to
evaluate changes, and will have many contentious debates and
bikeshedding.

It is unrealistic to develop revlog version 2 up front: there
are just too many uncertainties that we won't know until things
are implemented and experiments are run. Some changes will also
be invasive and prone to bit rot, so sitting on dozens of patches
is not practical.

This commit introduces skeleton support for version 2 revlogs in
a way that is flexible and not bound by backwards compatibility
concerns.

An experimental repo requirement for denoting revlog v2 has been
added. The requirement string has a sub-version component to it.
This will allow us to declare multiple requirements in the course
of developing revlog v2. Whenever we change the in-development
revlog v2 format, we can tweak the string, creating a new
requirement and locking out old clients. This will allow us to
make as many backwards incompatible changes and experiments to
revlog v2 as we want. In other words, we can land code and make
meaningful progress towards revlog v2 while still maintaining
extreme format flexibility up until the point we freeze the
format and remove the experimental labels.

To enable the new repo requirement, you must supply an experimental
and undocumented config option. But not just any boolean flag
will do: you need to explicitly use a value that no sane person
should ever type. This is an additional guard against enabling
revlog v2 on an installation it shouldn't be enabled on. The
specific scenario I'm trying to prevent is say a user with a
4.4 client with a frozen format enabling the option but then
downgrading to 4.3 and accidentally creating repos with an
outdated and unsupported repo format. Requiring a "challenge"
string should prevent this.

Because the format is not yet finalized and I don't want to take
any chances, revlog v2's version is currently 0xDEAD. I figure
squatting on a value we're likely never to use as an actual revlog
version to mean "internal testing only" is acceptable. And
"dead" is easily recognized as something meaningful.

There is a bunch of cleanup that is needed before work on revlog
v2 begins in earnest. I plan on doing that work once this patch
is accepted and we're comfortable with the idea of starting down
this path.

Test histedit extension: Fold commands
======================================

This test file is dedicated to testing the fold command in non conflicting
case.

Initialization
---------------


  $ . "$TESTDIR/histedit-helpers.sh"

  $ cat >> $HGRCPATH <<EOF
  > [alias]
  > logt = log --template '{rev}:{node|short} {desc|firstline}\n'
  > [extensions]
  > histedit=
  > EOF


Simple folding
--------------------
  $ addwithdate ()
  > {
  >     echo $1 > $1
  >     hg add $1
  >     hg ci -m $1 -d "$2 0"
  > }

  $ initrepo ()
  > {
  >     hg init r
  >     cd r
  >     addwithdate a 1
  >     addwithdate b 2
  >     addwithdate c 3
  >     addwithdate d 4
  >     addwithdate e 5
  >     addwithdate f 6
  > }

  $ initrepo

log before edit
  $ hg logt --graph
  @  5:178e35e0ce73 f
  |
  o  4:1ddb6c90f2ee e
  |
  o  3:532247a8969b d
  |
  o  2:ff2c9fa2018b c
  |
  o  1:97d72e5f12c7 b
  |
  o  0:8580ff50825a a
  

  $ hg histedit ff2c9fa2018b --commands - 2>&1 <<EOF | fixbundle
  > pick 1ddb6c90f2ee e
  > pick 178e35e0ce73 f
  > fold ff2c9fa2018b c
  > pick 532247a8969b d
  > EOF

log after edit
  $ hg logt --graph
  @  4:c4d7f3def76d d
  |
  o  3:575228819b7e f
  |
  o  2:505a591af19e e
  |
  o  1:97d72e5f12c7 b
  |
  o  0:8580ff50825a a
  

post-fold manifest
  $ hg manifest
  a
  b
  c
  d
  e
  f


check histedit_source, including that it uses the later date, from the first changeset

  $ hg log --debug --rev 3
  changeset:   3:575228819b7e6ed69e8c0a6a383ee59a80db7358
  phase:       draft
  parent:      2:505a591af19eed18f560af827b9e03d2076773dc
  parent:      -1:0000000000000000000000000000000000000000
  manifest:    3:81eede616954057198ead0b2c73b41d1f392829a
  user:        test
  date:        Thu Jan 01 00:00:06 1970 +0000
  files+:      c f
  extra:       branch=default
  extra:       histedit_source=7cad1d7030207872dfd1c3a7cb430f24f2884086,ff2c9fa2018b15fa74b33363bda9527323e2a99f
  description:
  f
  ***
  c
  
  

rollup will fold without preserving the folded commit's message or date

  $ OLDHGEDITOR=$HGEDITOR
  $ HGEDITOR=false
  $ hg histedit 97d72e5f12c7 --commands - 2>&1 <<EOF | fixbundle
  > pick 97d72e5f12c7 b
  > roll 505a591af19e e
  > pick 575228819b7e f
  > pick c4d7f3def76d d
  > EOF

  $ HGEDITOR=$OLDHGEDITOR

log after edit
  $ hg logt --graph
  @  3:bab801520cec d
  |
  o  2:58c8f2bfc151 f
  |
  o  1:5d939c56c72e b
  |
  o  0:8580ff50825a a
  

description is taken from rollup target commit

  $ hg log --debug --rev 1
  changeset:   1:5d939c56c72e77e29f5167696218e2131a40f5cf
  phase:       draft
  parent:      0:8580ff50825a50c8f716709acdf8de0deddcd6ab
  parent:      -1:0000000000000000000000000000000000000000
  manifest:    1:b5e112a3a8354e269b1524729f0918662d847c38
  user:        test
  date:        Thu Jan 01 00:00:02 1970 +0000
  files+:      b e
  extra:       branch=default
  extra:       histedit_source=97d72e5f12c7e84f85064aa72e5a297142c36ed9,505a591af19eed18f560af827b9e03d2076773dc
  description:
  b
  
  

check saving last-message.txt

  $ cat > $TESTTMP/abortfolding.py <<EOF
  > from mercurial import util
  > def abortfolding(ui, repo, hooktype, **kwargs):
  >     ctx = repo[kwargs.get('node')]
  >     if set(ctx.files()) == {'c', 'd', 'f'}:
  >         return True # abort folding commit only
  >     ui.warn('allow non-folding commit\\n')
  > EOF
  $ cat > .hg/hgrc <<EOF
  > [hooks]
  > pretxncommit.abortfolding = python:$TESTTMP/abortfolding.py:abortfolding
  > EOF

  $ cat > $TESTTMP/editor.sh << EOF
  > echo "==== before editing"
  > cat \$1
  > echo "===="
  > echo "check saving last-message.txt" >> \$1
  > EOF

  $ rm -f .hg/last-message.txt
  $ hg status --rev '58c8f2bfc151^1::bab801520cec'
  A c
  A d
  A f
  $ HGEDITOR="sh $TESTTMP/editor.sh" hg histedit 58c8f2bfc151 --commands - 2>&1 <<EOF
  > pick 58c8f2bfc151 f
  > fold bab801520cec d
  > EOF
  allow non-folding commit
  ==== before editing
  f
  ***
  c
  ***
  d
  
  
  
  HG: Enter commit message.  Lines beginning with 'HG:' are removed.
  HG: Leave message empty to abort commit.
  HG: --
  HG: user: test
  HG: branch 'default'
  HG: added c
  HG: added d
  HG: added f
  ====
  transaction abort!
  rollback completed
  abort: pretxncommit.abortfolding hook failed
  [255]

  $ cat .hg/last-message.txt
  f
  ***
  c
  ***
  d
  
  
  
  check saving last-message.txt

  $ cd ..
  $ rm -r r

folding preserves initial author but uses later date
----------------------------------------------------

  $ initrepo

  $ hg ci -d '7 0' --user "someone else" --amend --quiet

tip before edit
  $ hg log --rev .
  changeset:   5:10c36dd37515
  tag:         tip
  user:        someone else
  date:        Thu Jan 01 00:00:07 1970 +0000
  summary:     f
  

  $ hg --config progress.debug=1 --debug \
  > histedit 1ddb6c90f2ee --commands - 2>&1 <<EOF | \
  > egrep 'editing|unresolved'
  > pick 1ddb6c90f2ee e
  > fold 10c36dd37515 f
  > EOF
  editing: pick 1ddb6c90f2ee 4 e 1/2 changes (50.00%)
  editing: fold 10c36dd37515 5 f 2/2 changes (100.00%)

tip after edit, which should use the later date, from the second changeset
  $ hg log --rev .
  changeset:   4:e4f3ec5d0b40
  tag:         tip
  user:        test
  date:        Thu Jan 01 00:00:07 1970 +0000
  summary:     e
  

  $ cd ..
  $ rm -r r

folding and creating no new change doesn't break:
-------------------------------------------------

folded content is dropped during a merge. The folded commit should properly disappear.

  $ mkdir fold-to-empty-test
  $ cd fold-to-empty-test
  $ hg init
  $ printf "1\n2\n3\n" > file
  $ hg add file
  $ hg commit -m '1+2+3'
  $ echo 4 >> file
  $ hg commit -m '+4'
  $ echo 5 >> file
  $ hg commit -m '+5'
  $ echo 6 >> file
  $ hg commit -m '+6'
  $ hg logt --graph
  @  3:251d831eeec5 +6
  |
  o  2:888f9082bf99 +5
  |
  o  1:617f94f13c0f +4
  |
  o  0:0189ba417d34 1+2+3
  

  $ hg histedit 1 --commands - << EOF
  > pick 617f94f13c0f 1 +4
  > drop 888f9082bf99 2 +5
  > fold 251d831eeec5 3 +6
  > EOF
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  merging file
  warning: conflicts while merging file! (edit, then use 'hg resolve --mark')
  Fix up the change (fold 251d831eeec5)
  (hg histedit --continue to resume)
  [1]
There were conflicts, we keep P1 content. This
should effectively drop the changes from +6.
  $ hg status
  M file
  ? file.orig
  $ hg resolve -l
  U file
  $ hg revert -r 'p1()' file
  $ hg resolve --mark file
  (no more unresolved files)
  continue: hg histedit --continue
  $ hg histedit --continue
  251d831eeec5: empty changeset
  saved backup bundle to $TESTTMP/*-backup.hg (glob)
  $ hg logt --graph
  @  1:617f94f13c0f +4
  |
  o  0:0189ba417d34 1+2+3
  

  $ cd ..


Test fold through dropped
-------------------------


Test corner case where folded revision is separated from its parent by a
dropped revision.


  $ hg init fold-with-dropped
  $ cd fold-with-dropped
  $ printf "1\n2\n3\n" > file
  $ hg commit -Am '1+2+3'
  adding file
  $ echo 4 >> file
  $ hg commit -m '+4'
  $ echo 5 >> file
  $ hg commit -m '+5'
  $ echo 6 >> file
  $ hg commit -m '+6'
  $ hg logt -G
  @  3:251d831eeec5 +6
  |
  o  2:888f9082bf99 +5
  |
  o  1:617f94f13c0f +4
  |
  o  0:0189ba417d34 1+2+3
  
  $ hg histedit 1 --commands -  << EOF
  > pick 617f94f13c0f 1 +4
  > drop 888f9082bf99 2 +5
  > fold 251d831eeec5 3 +6
  > EOF
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  merging file
  warning: conflicts while merging file! (edit, then use 'hg resolve --mark')
  Fix up the change (fold 251d831eeec5)
  (hg histedit --continue to resume)
  [1]
  $ cat > file << EOF
  > 1
  > 2
  > 3
  > 4
  > 5
  > EOF
  $ hg resolve --mark file
  (no more unresolved files)
  continue: hg histedit --continue
  $ hg commit -m '+5.2'
  created new head
  $ echo 6 >> file
  $ HGEDITOR=cat hg histedit --continue
  +4
  ***
  +5.2
  ***
  +6
  
  
  
  HG: Enter commit message.  Lines beginning with 'HG:' are removed.
  HG: Leave message empty to abort commit.
  HG: --
  HG: user: test
  HG: branch 'default'
  HG: changed file
  saved backup bundle to $TESTTMP/fold-with-dropped/.hg/strip-backup/55c8d8dc79ce-4066cd98-backup.hg (glob)
  saved backup bundle to $TESTTMP/fold-with-dropped/.hg/strip-backup/617f94f13c0f-a35700fc-backup.hg (glob)
  $ hg logt -G
  @  1:10c647b2cdd5 +4
  |
  o  0:0189ba417d34 1+2+3
  
  $ hg export tip
  # HG changeset patch
  # User test
  # Date 0 0
  #      Thu Jan 01 00:00:00 1970 +0000
  # Node ID 10c647b2cdd54db0603ecb99b2ff5ce66d5a5323
  # Parent  0189ba417d34df9dda55f88b637dcae9917b5964
  +4
  ***
  +5.2
  ***
  +6
  
  diff -r 0189ba417d34 -r 10c647b2cdd5 file
  --- a/file	Thu Jan 01 00:00:00 1970 +0000
  +++ b/file	Thu Jan 01 00:00:00 1970 +0000
  @@ -1,3 +1,6 @@
   1
   2
   3
  +4
  +5
  +6
  $ cd ..


Folding with initial rename (issue3729)
---------------------------------------

  $ hg init fold-rename
  $ cd fold-rename
  $ echo a > a.txt
  $ hg add a.txt
  $ hg commit -m a
  $ hg rename a.txt b.txt
  $ hg commit -m rename
  $ echo b >> b.txt
  $ hg commit -m b

  $ hg logt --follow b.txt
  2:e0371e0426bc b
  1:1c4f440a8085 rename
  0:6c795aa153cb a

  $ hg histedit 1c4f440a8085 --commands - 2>&1 << EOF | fixbundle
  > pick 1c4f440a8085 rename
  > fold e0371e0426bc b
  > EOF

  $ hg logt --follow b.txt
  1:cf858d235c76 rename
  0:6c795aa153cb a

  $ cd ..

Folding with swapping
---------------------

This is an excuse to test hook with histedit temporary commit (issue4422)


  $ hg init issue4422
  $ cd issue4422
  $ echo a > a.txt
  $ hg add a.txt
  $ hg commit -m a
  $ echo b > b.txt
  $ hg add b.txt
  $ hg commit -m b
  $ echo c > c.txt
  $ hg add c.txt
  $ hg commit -m c

  $ hg logt
  2:a1a953ffb4b0 c
  1:199b6bb90248 b
  0:6c795aa153cb a

Setup the proper environment variable symbol for the platform, to be subbed
into the hook command.
#if windows
  $ NODE="%HG_NODE%"
#else
  $ NODE="\$HG_NODE"
#endif
  $ hg histedit 6c795aa153cb --config hooks.commit="echo commit $NODE" --commands - 2>&1 << EOF | fixbundle
  > pick 199b6bb90248 b
  > fold a1a953ffb4b0 c
  > pick 6c795aa153cb a
  > EOF
  commit 9599899f62c05f4377548c32bf1c9f1a39634b0c

  $ hg logt
  1:9599899f62c0 a
  0:79b99e9c8e49 b

  $ echo "foo" > amended.txt
  $ hg add amended.txt
  $ hg ci -q --config extensions.largefiles= --amend -I amended.txt

Test that folding multiple changes in a row doesn't show multiple
editors.

  $ echo foo >> foo
  $ hg add foo
  $ hg ci -m foo1
  $ echo foo >> foo
  $ hg ci -m foo2
  $ echo foo >> foo
  $ hg ci -m foo3
  $ hg logt
  4:21679ff7675c foo3
  3:b7389cc4d66e foo2
  2:0e01aeef5fa8 foo1
  1:578c7455730c a
  0:79b99e9c8e49 b
  $ cat > "$TESTTMP/editor.sh" <<EOF
  > echo ran editor >> "$TESTTMP/editorlog.txt"
  > cat \$1 >> "$TESTTMP/editorlog.txt"
  > echo END >> "$TESTTMP/editorlog.txt"
  > echo merged foos > \$1
  > EOF
  $ HGEDITOR="sh \"$TESTTMP/editor.sh\"" hg histedit 1 --commands - 2>&1 <<EOF | fixbundle
  > pick 578c7455730c 1 a
  > pick 0e01aeef5fa8 2 foo1
  > fold b7389cc4d66e 3 foo2
  > fold 21679ff7675c 4 foo3
  > EOF
  $ hg logt
  2:e8bedbda72c1 merged foos
  1:578c7455730c a
  0:79b99e9c8e49 b
Editor should have run only once
  $ cat $TESTTMP/editorlog.txt
  ran editor
  foo1
  ***
  foo2
  ***
  foo3
  
  
  
  HG: Enter commit message.  Lines beginning with 'HG:' are removed.
  HG: Leave message empty to abort commit.
  HG: --
  HG: user: test
  HG: branch 'default'
  HG: added foo
  END

  $ cd ..