view tests/test-revert.t @ 30155:b7a966ce89ed

changelog: disable delta chains

This patch disables delta chains on changelogs. After this patch, new
entries on changelogs - including existing changelogs - will be stored
as the fulltext of that data (likely compressed). No delta computation
will be performed.

An overview of delta chains and data justifying this change follows.

Revlogs try to store entries as a delta against a previous entry (either
a parent revision in the case of generaldelta or the previous physical
revision when not using generaldelta). Most of the time this is the
correct thing to do: it frequently results in less CPU usage and smaller
storage.

Delta chains are most effective when the base revision being deltad
against is similar to the current data. This tends to occur naturally
for manifests and file data, since only small parts of each tend to
change with each revision. Changelogs, however, are a different story.

Changelog entries represent changesets/commits. And unless commits in a
repository are homogonous (same author, changing same files, similar
commit messages, etc), a delta from one entry to the next tends to be
relatively large compared to the size of the entry. This means that
delta chains tend to be short. How short? Here is the full vs delta
revision breakdown on some real world repos:

Repo             % Full    % Delta   Max Length
hg                45.8       54.2        6
mozilla-central   42.4       57.6        8
mozilla-unified   42.5       57.5       17
pypy              46.1       53.9        6
python-zstandard  46.1       53.9        3

(I threw in python-zstandard as an example of a repo that is homogonous.
It contains a small Python project with changes all from the same
author.)

Contrast this with the manifest revlog for these repos, where 99+% of
revisions are deltas and delta chains run into the thousands.

So delta chains aren't as useful on changelogs. But even a short delta
chain may provide benefits. Let's measure that.

Delta chains may require less CPU to read revisions if the CPU time
spent reading smaller deltas is less than the CPU time used to
decompress larger individual entries. We can measure this via
`hg perfrevlog -c -d 1` to iterate a revlog to resolve each revision's
fulltext. Here are the results of that command on a repo using delta
chains in its changelog and on a repo without delta chains:

hg (forward)
! wall 0.407008 comb 0.410000 user 0.410000 sys 0.000000 (best of 25)
! wall 0.390061 comb 0.390000 user 0.390000 sys 0.000000 (best of 26)

hg (reverse)
! wall 0.515221 comb 0.520000 user 0.520000 sys 0.000000 (best of 19)
! wall 0.400018 comb 0.400000 user 0.390000 sys 0.010000 (best of 25)

mozilla-central (forward)
! wall 4.508296 comb 4.490000 user 4.490000 sys 0.000000 (best of 3)
! wall 4.370222 comb 4.370000 user 4.350000 sys 0.020000 (best of 3)

mozilla-central (reverse)
! wall 5.758995 comb 5.760000 user 5.720000 sys 0.040000 (best of 3)
! wall 4.346503 comb 4.340000 user 4.320000 sys 0.020000 (best of 3)

mozilla-unified (forward)
! wall 4.957088 comb 4.950000 user 4.940000 sys 0.010000 (best of 3)
! wall 4.660528 comb 4.650000 user 4.630000 sys 0.020000 (best of 3)

mozilla-unified (reverse)
! wall 6.119827 comb 6.110000 user 6.090000 sys 0.020000 (best of 3)
! wall 4.675136 comb 4.670000 user 4.670000 sys 0.000000 (best of 3)

pypy (forward)
! wall 1.231122 comb 1.240000 user 1.230000 sys 0.010000 (best of 8)
! wall 1.164896 comb 1.160000 user 1.160000 sys 0.000000 (best of 9)

pypy (reverse)
! wall 1.467049 comb 1.460000 user 1.460000 sys 0.000000 (best of 7)
! wall 1.160200 comb 1.170000 user 1.160000 sys 0.010000 (best of 9)

The data clearly shows that it takes less wall and CPU time to resolve
revisions when there are no delta chains in the changelogs, regardless
of the direction of traversal. Furthermore, not using a delta chain
means that fulltext resolution in reverse is as fast as iterating
forward. So not using delta chains on the changelog is a clear CPU win
for reading operations.

An example of a user-visible operation showing this speed-up is revset
evaluation. Here are results for
`hg perfrevset 'author(gps) or author(mpm)'`:

hg
! wall 1.655506 comb 1.660000 user 1.650000 sys 0.010000 (best of 6)
! wall 1.612723 comb 1.610000 user 1.600000 sys 0.010000 (best of 7)

mozilla-central
! wall 17.629826 comb 17.640000 user 17.600000 sys 0.040000 (best of 3)
! wall 17.311033 comb 17.300000 user 17.260000 sys 0.040000 (best of 3)

What about 00changelog.i size?

Repo                Delta Chains     No Delta Chains
hg                    7,033,250         6,976,771
mozilla-central      82,978,748        81,574,623
mozilla-unified      88,112,349        86,702,162
pypy                 20,740,699        20,659,741

The data shows that removing delta chains from the changelog makes the
changelog smaller.

Delta chains are also used during changegroup generation. This
operation essentially converts a series of revisions to one large
delta chain. And changegroup generation is smart: if the delta in
the revlog matches what the changegroup is emitting, it will reuse
the delta instead of recalculating it. We can measure the impact
removing changelog delta chains has on changegroup generation via
`hg perfchangegroupchangelog`:

hg
! wall 1.589245 comb 1.590000 user 1.590000 sys 0.000000 (best of 7)
! wall 1.788060 comb 1.790000 user 1.790000 sys 0.000000 (best of 6)

mozilla-central
! wall 17.382585 comb 17.380000 user 17.340000 sys 0.040000 (best of 3)
! wall 20.161357 comb 20.160000 user 20.120000 sys 0.040000 (best of 3)

mozilla-unified
! wall 18.722839 comb 18.720000 user 18.680000 sys 0.040000 (best of 3)
! wall 21.168075 comb 21.170000 user 21.130000 sys 0.040000 (best of 3)

pypy
! wall 4.828317 comb 4.830000 user 4.820000 sys 0.010000 (best of 3)
! wall 5.415455 comb 5.420000 user 5.410000 sys 0.010000 (best of 3)

The data shows eliminating delta chains makes the changelog part of
changegroup generation slower. This is expected since we now have to
compute deltas for revisions where we could recycle the delta before.

It is worth putting this regression into context of overall changegroup
times. Here is the rough total CPU time spent in changegroup generation
for various repos while using delta chains on the changelog:

Repo              CPU Time (s)    CPU Time w/ compression
hg                  4.50              7.05
mozilla-central   111.1             222.0
pypy               28.68             75.5

Before compression, removing delta chains from the changegroup adds
~4.4% overhead to hg changegroup generation, 1.3% to mozilla-central,
and 2.0% to pypy. When you factor in zlib compression, these percentages
are roughly divided by 2.

While the increased CPU usage for changegroup generation is unfortunate,
I think it is acceptable because the percentage is small, server
operators (those likely impacted most by this) have other mechanisms
to mitigate CPU consumption (namely reducing zlib compression level and
pre-generated clone bundles), and because there is room to optimize this
in the future. For example, we could use the nullid as the base revision,
effectively encoding the full revision for each entry in the changegroup.
When doing this, `hg perfchangegroupchangelog` nearly halves:

mozilla-unified
! wall 21.168075 comb 21.170000 user 21.130000 sys 0.040000 (best of 3)
! wall 11.196461 comb 11.200000 user 11.190000 sys 0.010000 (best of 3)

This looks very promising as a future optimization opportunity.

It's worth that the changes in test-acl.t to the changegroup part size.
This is because revision 6 in the changegroup had a delta chain of
length 2 before and after this patch the base revision is nullrev.
When the base revision is nullrev, cg2packer.deltaparent() hardcodes
the *previous* revision from the changegroup as the delta parent.
This caused the delta in the changegroup to switch base revisions,
the delta to change, and the size to change accordingly. While the
size increased in this case, I think sizes will remain the same
on average, as the delta base for changelog revisions doesn't matter
too much (as this patch shows). So, I don't consider this a regression.

  $ hg init repo
  $ cd repo
  $ echo 123 > a
  $ echo 123 > c
  $ echo 123 > e
  $ hg add a c e
  $ hg commit -m "first" a c e

nothing changed

  $ hg revert
  abort: no files or directories specified
  (use --all to revert all files)
  [255]
  $ hg revert --all

Introduce some changes and revert them
--------------------------------------

  $ echo 123 > b

  $ hg status
  ? b
  $ echo 12 > c

  $ hg status
  M c
  ? b
  $ hg add b

  $ hg status
  M c
  A b
  $ hg rm a

  $ hg status
  M c
  A b
  R a

revert removal of a file

  $ hg revert a
  $ hg status
  M c
  A b

revert addition of a file

  $ hg revert b
  $ hg status
  M c
  ? b

revert modification of a file (--no-backup)

  $ hg revert --no-backup c
  $ hg status
  ? b

revert deletion (! status) of a added file
------------------------------------------

  $ hg add b

  $ hg status b
  A b
  $ rm b
  $ hg status b
  ! b
  $ hg revert -v b
  forgetting b
  $ hg status b
  b: * (glob)

  $ ls
  a
  c
  e

Test creation of backup (.orig) files
-------------------------------------

  $ echo z > e
  $ hg revert --all -v
  saving current version of e as e.orig
  reverting e

Test creation of backup (.orig) file in configured file location
----------------------------------------------------------------

  $ echo z > e
  $ hg revert --all -v --config 'ui.origbackuppath=.hg/origbackups'
  creating directory: $TESTTMP/repo/.hg/origbackups (glob)
  saving current version of e as $TESTTMP/repo/.hg/origbackups/e.orig (glob)
  reverting e
  $ rm -rf .hg/origbackups

revert on clean file (no change)
--------------------------------

  $ hg revert a
  no changes needed to a

revert on an untracked file
---------------------------

  $ echo q > q
  $ hg revert q
  file not managed: q
  $ rm q

revert on file that does not exists
-----------------------------------

  $ hg revert notfound
  notfound: no such file in rev 334a9e57682c
  $ touch d
  $ hg add d
  $ hg rm a
  $ hg commit -m "second"
  $ echo z > z
  $ hg add z
  $ hg st
  A z
  ? e.orig

revert to another revision (--rev)
----------------------------------

  $ hg revert --all -r0
  adding a
  removing d
  forgetting z

revert explicitly to parent (--rev)
-----------------------------------

  $ hg revert --all -rtip
  forgetting a
  undeleting d
  $ rm a *.orig

revert to another revision (--rev) and exact match
--------------------------------------------------

exact match are more silent

  $ hg revert -r0 a
  $ hg st a
  A a
  $ hg rm d
  $ hg st d
  R d

should keep d removed

  $ hg revert -r0 d
  no changes needed to d
  $ hg st d
  R d

  $ hg update -C
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved

revert of exec bit
------------------

#if execbit
  $ chmod +x c
  $ hg revert --all
  reverting c

  $ test -x c || echo non-executable
  non-executable

  $ chmod +x c
  $ hg commit -m exe

  $ chmod -x c
  $ hg revert --all
  reverting c

  $ test -x c && echo executable
  executable
#endif

Test that files reverted to other than the parent are treated as
"modified", even if none of mode, size and timestamp of it isn't
changed on the filesystem (see also issue4583).

  $ echo 321 > e
  $ hg diff --git
  diff --git a/e b/e
  --- a/e
  +++ b/e
  @@ -1,1 +1,1 @@
  -123
  +321
  $ hg commit -m 'ambiguity from size'

  $ cat e
  321
  $ touch -t 200001010000 e
  $ hg debugrebuildstate

  $ cat >> .hg/hgrc <<EOF
  > [fakedirstatewritetime]
  > # emulate invoking dirstate.write() via repo.status()
  > # at 2000-01-01 00:00
  > fakenow = 200001010000
  > 
  > [extensions]
  > fakedirstatewritetime = $TESTDIR/fakedirstatewritetime.py
  > EOF
  $ hg revert -r 0 e
  $ cat >> .hg/hgrc <<EOF
  > [extensions]
  > fakedirstatewritetime = !
  > EOF

  $ cat e
  123
  $ touch -t 200001010000 e
  $ hg status -A e
  M e

  $ cd ..


Issue241: update and revert produces inconsistent repositories
--------------------------------------------------------------

  $ hg init a
  $ cd a
  $ echo a >> a
  $ hg commit -A -d '1 0' -m a
  adding a
  $ echo a >> a
  $ hg commit -d '2 0' -m a
  $ hg update 0
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ mkdir b
  $ echo b > b/b

call `hg revert` with no file specified
---------------------------------------

  $ hg revert -rtip
  abort: no files or directories specified
  (use --all to revert all files, or 'hg update 1' to update)
  [255]

call `hg revert` with -I
---------------------------

  $ echo a >> a
  $ hg revert -I a
  reverting a

call `hg revert` with -X
---------------------------

  $ echo a >> a
  $ hg revert -X d
  reverting a

call `hg revert` with --all
---------------------------

  $ hg revert --all -rtip
  reverting a
  $ rm *.orig

Issue332: confusing message when reverting directory
----------------------------------------------------

  $ hg ci -A -m b
  adding b/b
  created new head
  $ echo foobar > b/b
  $ mkdir newdir
  $ echo foo > newdir/newfile
  $ hg add newdir/newfile
  $ hg revert b newdir
  reverting b/b (glob)
  forgetting newdir/newfile (glob)
  $ echo foobar > b/b
  $ hg revert .
  reverting b/b (glob)


reverting a rename target should revert the source
--------------------------------------------------

  $ hg mv a newa
  $ hg revert newa
  $ hg st a newa
  ? newa

Also true for move overwriting an existing file

  $ hg mv --force a b/b
  $ hg revert b/b
  $ hg status a b/b

  $ cd ..

  $ hg init ignored
  $ cd ignored
  $ echo '^ignored$' > .hgignore
  $ echo '^ignoreddir$' >> .hgignore
  $ echo '^removed$' >> .hgignore

  $ mkdir ignoreddir
  $ touch ignoreddir/file
  $ touch ignoreddir/removed
  $ touch ignored
  $ touch removed

4 ignored files (we will add/commit everything)

  $ hg st -A -X .hgignore
  I ignored
  I ignoreddir/file
  I ignoreddir/removed
  I removed
  $ hg ci -qAm 'add files' ignored ignoreddir/file ignoreddir/removed removed

  $ echo >> ignored
  $ echo >> ignoreddir/file
  $ hg rm removed ignoreddir/removed

should revert ignored* and undelete *removed
--------------------------------------------

  $ hg revert -a --no-backup
  reverting ignored
  reverting ignoreddir/file (glob)
  undeleting ignoreddir/removed (glob)
  undeleting removed
  $ hg st -mardi

  $ hg up -qC
  $ echo >> ignored
  $ hg rm removed

should silently revert the named files
--------------------------------------

  $ hg revert --no-backup ignored removed
  $ hg st -mardi

Reverting copy (issue3920)
--------------------------

someone set up us the copies

  $ rm .hgignore
  $ hg update -C
  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg mv ignored allyour
  $ hg copy removed base
  $ hg commit -m rename

copies and renames, you have no chance to survive make your time (issue3920)

  $ hg update '.^'
  1 files updated, 0 files merged, 2 files removed, 0 files unresolved
  $ hg revert -rtip -a
  adding allyour
  adding base
  removing ignored
  $ hg status -C
  A allyour
    ignored
  A base
    removed
  R ignored

Test revert of a file added by one side of the merge
====================================================

remove any pending change

  $ hg revert --all
  forgetting allyour
  forgetting base
  undeleting ignored
  $ hg purge --all --config extensions.purge=

Adds a new commit

  $ echo foo > newadd
  $ hg add newadd
  $ hg commit -m 'other adds'
  created new head


merge it with the other head

  $ hg merge # merge 1 into 2
  2 files updated, 0 files merged, 1 files removed, 0 files unresolved
  (branch merge, don't forget to commit)
  $ hg summary
  parent: 2:b8ec310b2d4e tip
   other adds
  parent: 1:f6180deb8fbe 
   rename
  branch: default
  commit: 2 modified, 1 removed (merge)
  update: (current)
  phases: 3 draft

clarifies who added what

  $ hg status
  M allyour
  M base
  R ignored
  $ hg status --change 'p1()'
  A newadd
  $ hg status --change 'p2()'
  A allyour
  A base
  R ignored

revert file added by p1() to p1() state
-----------------------------------------

  $ hg revert -r 'p1()' 'glob:newad?'
  $ hg status
  M allyour
  M base
  R ignored

revert file added by p1() to p2() state
------------------------------------------

  $ hg revert -r 'p2()' 'glob:newad?'
  removing newadd
  $ hg status
  M allyour
  M base
  R ignored
  R newadd

revert file added by p2() to p2() state
------------------------------------------

  $ hg revert -r 'p2()' 'glob:allyou?'
  $ hg status
  M allyour
  M base
  R ignored
  R newadd

revert file added by p2() to p1() state
------------------------------------------

  $ hg revert -r 'p1()' 'glob:allyou?'
  removing allyour
  $ hg status
  M base
  R allyour
  R ignored
  R newadd

Systematic behavior validation of most possible cases
=====================================================

This section tests most of the possible combinations of revision states and
working directory states. The number of possible cases is significant but they
but they all have a slightly different handling. So this section commits to
and testing all of them to allow safe refactoring of the revert code.

A python script is used to generate a file history for each combination of
states, on one side the content (or lack thereof) in two revisions, and
on the other side, the content and "tracked-ness" of the working directory. The
three states generated are:

- a "base" revision
- a "parent" revision
- the working directory (based on "parent")

The files generated have names of the form:

 <rev1-content>_<rev2-content>_<working-copy-content>-<tracked-ness>

All known states are not tested yet. See inline documentation for details.
Special cases from merge and rename are not tested by this section.

Write the python script to disk
-------------------------------

check list of planned files

  $ python $TESTDIR/generate-working-copy-states.py filelist 2
  content1_content1_content1-tracked
  content1_content1_content1-untracked
  content1_content1_content3-tracked
  content1_content1_content3-untracked
  content1_content1_missing-tracked
  content1_content1_missing-untracked
  content1_content2_content1-tracked
  content1_content2_content1-untracked
  content1_content2_content2-tracked
  content1_content2_content2-untracked
  content1_content2_content3-tracked
  content1_content2_content3-untracked
  content1_content2_missing-tracked
  content1_content2_missing-untracked
  content1_missing_content1-tracked
  content1_missing_content1-untracked
  content1_missing_content3-tracked
  content1_missing_content3-untracked
  content1_missing_missing-tracked
  content1_missing_missing-untracked
  missing_content2_content2-tracked
  missing_content2_content2-untracked
  missing_content2_content3-tracked
  missing_content2_content3-untracked
  missing_content2_missing-tracked
  missing_content2_missing-untracked
  missing_missing_content3-tracked
  missing_missing_content3-untracked
  missing_missing_missing-tracked
  missing_missing_missing-untracked

Script to make a simple text version of the content
---------------------------------------------------

  $ cat << EOF >> dircontent.py
  > # generate a simple text view of the directory for easy comparison
  > import os
  > files = os.listdir('.')
  > files.sort()
  > for filename in files:
  >     if os.path.isdir(filename):
  >         continue
  >     content = open(filename).read()
  >     print '%-6s %s' % (content.strip(), filename)
  > EOF

Generate appropriate repo state
-------------------------------

  $ hg init revert-ref
  $ cd revert-ref

Generate base changeset

  $ python $TESTDIR/generate-working-copy-states.py state 2 1
  $ hg addremove --similarity 0
  adding content1_content1_content1-tracked
  adding content1_content1_content1-untracked
  adding content1_content1_content3-tracked
  adding content1_content1_content3-untracked
  adding content1_content1_missing-tracked
  adding content1_content1_missing-untracked
  adding content1_content2_content1-tracked
  adding content1_content2_content1-untracked
  adding content1_content2_content2-tracked
  adding content1_content2_content2-untracked
  adding content1_content2_content3-tracked
  adding content1_content2_content3-untracked
  adding content1_content2_missing-tracked
  adding content1_content2_missing-untracked
  adding content1_missing_content1-tracked
  adding content1_missing_content1-untracked
  adding content1_missing_content3-tracked
  adding content1_missing_content3-untracked
  adding content1_missing_missing-tracked
  adding content1_missing_missing-untracked
  $ hg status
  A content1_content1_content1-tracked
  A content1_content1_content1-untracked
  A content1_content1_content3-tracked
  A content1_content1_content3-untracked
  A content1_content1_missing-tracked
  A content1_content1_missing-untracked
  A content1_content2_content1-tracked
  A content1_content2_content1-untracked
  A content1_content2_content2-tracked
  A content1_content2_content2-untracked
  A content1_content2_content3-tracked
  A content1_content2_content3-untracked
  A content1_content2_missing-tracked
  A content1_content2_missing-untracked
  A content1_missing_content1-tracked
  A content1_missing_content1-untracked
  A content1_missing_content3-tracked
  A content1_missing_content3-untracked
  A content1_missing_missing-tracked
  A content1_missing_missing-untracked
  $ hg commit -m 'base'

(create a simple text version of the content)

  $ python ../dircontent.py > ../content-base.txt
  $ cat ../content-base.txt
  content1 content1_content1_content1-tracked
  content1 content1_content1_content1-untracked
  content1 content1_content1_content3-tracked
  content1 content1_content1_content3-untracked
  content1 content1_content1_missing-tracked
  content1 content1_content1_missing-untracked
  content1 content1_content2_content1-tracked
  content1 content1_content2_content1-untracked
  content1 content1_content2_content2-tracked
  content1 content1_content2_content2-untracked
  content1 content1_content2_content3-tracked
  content1 content1_content2_content3-untracked
  content1 content1_content2_missing-tracked
  content1 content1_content2_missing-untracked
  content1 content1_missing_content1-tracked
  content1 content1_missing_content1-untracked
  content1 content1_missing_content3-tracked
  content1 content1_missing_content3-untracked
  content1 content1_missing_missing-tracked
  content1 content1_missing_missing-untracked

Create parent changeset

  $ python $TESTDIR/generate-working-copy-states.py state 2 2
  $ hg addremove --similarity 0
  removing content1_missing_content1-tracked
  removing content1_missing_content1-untracked
  removing content1_missing_content3-tracked
  removing content1_missing_content3-untracked
  removing content1_missing_missing-tracked
  removing content1_missing_missing-untracked
  adding missing_content2_content2-tracked
  adding missing_content2_content2-untracked
  adding missing_content2_content3-tracked
  adding missing_content2_content3-untracked
  adding missing_content2_missing-tracked
  adding missing_content2_missing-untracked
  $ hg status
  M content1_content2_content1-tracked
  M content1_content2_content1-untracked
  M content1_content2_content2-tracked
  M content1_content2_content2-untracked
  M content1_content2_content3-tracked
  M content1_content2_content3-untracked
  M content1_content2_missing-tracked
  M content1_content2_missing-untracked
  A missing_content2_content2-tracked
  A missing_content2_content2-untracked
  A missing_content2_content3-tracked
  A missing_content2_content3-untracked
  A missing_content2_missing-tracked
  A missing_content2_missing-untracked
  R content1_missing_content1-tracked
  R content1_missing_content1-untracked
  R content1_missing_content3-tracked
  R content1_missing_content3-untracked
  R content1_missing_missing-tracked
  R content1_missing_missing-untracked
  $ hg commit -m 'parent'

(create a simple text version of the content)

  $ python ../dircontent.py > ../content-parent.txt
  $ cat ../content-parent.txt
  content1 content1_content1_content1-tracked
  content1 content1_content1_content1-untracked
  content1 content1_content1_content3-tracked
  content1 content1_content1_content3-untracked
  content1 content1_content1_missing-tracked
  content1 content1_content1_missing-untracked
  content2 content1_content2_content1-tracked
  content2 content1_content2_content1-untracked
  content2 content1_content2_content2-tracked
  content2 content1_content2_content2-untracked
  content2 content1_content2_content3-tracked
  content2 content1_content2_content3-untracked
  content2 content1_content2_missing-tracked
  content2 content1_content2_missing-untracked
  content2 missing_content2_content2-tracked
  content2 missing_content2_content2-untracked
  content2 missing_content2_content3-tracked
  content2 missing_content2_content3-untracked
  content2 missing_content2_missing-tracked
  content2 missing_content2_missing-untracked

Setup working directory

  $ python $TESTDIR/generate-working-copy-states.py state 2 wc
  $ hg addremove --similarity 0
  adding content1_missing_content1-tracked
  adding content1_missing_content1-untracked
  adding content1_missing_content3-tracked
  adding content1_missing_content3-untracked
  adding content1_missing_missing-tracked
  adding content1_missing_missing-untracked
  adding missing_missing_content3-tracked
  adding missing_missing_content3-untracked
  adding missing_missing_missing-tracked
  adding missing_missing_missing-untracked
  $ hg forget *_*_*-untracked
  $ rm *_*_missing-*
  $ hg status
  M content1_content1_content3-tracked
  M content1_content2_content1-tracked
  M content1_content2_content3-tracked
  M missing_content2_content3-tracked
  A content1_missing_content1-tracked
  A content1_missing_content3-tracked
  A missing_missing_content3-tracked
  R content1_content1_content1-untracked
  R content1_content1_content3-untracked
  R content1_content1_missing-untracked
  R content1_content2_content1-untracked
  R content1_content2_content2-untracked
  R content1_content2_content3-untracked
  R content1_content2_missing-untracked
  R missing_content2_content2-untracked
  R missing_content2_content3-untracked
  R missing_content2_missing-untracked
  ! content1_content1_missing-tracked
  ! content1_content2_missing-tracked
  ! content1_missing_missing-tracked
  ! missing_content2_missing-tracked
  ! missing_missing_missing-tracked
  ? content1_missing_content1-untracked
  ? content1_missing_content3-untracked
  ? missing_missing_content3-untracked

  $ hg status --rev 'desc("base")'
  M content1_content1_content3-tracked
  M content1_content2_content2-tracked
  M content1_content2_content3-tracked
  M content1_missing_content3-tracked
  A missing_content2_content2-tracked
  A missing_content2_content3-tracked
  A missing_missing_content3-tracked
  R content1_content1_content1-untracked
  R content1_content1_content3-untracked
  R content1_content1_missing-untracked
  R content1_content2_content1-untracked
  R content1_content2_content2-untracked
  R content1_content2_content3-untracked
  R content1_content2_missing-untracked
  R content1_missing_content1-untracked
  R content1_missing_content3-untracked
  R content1_missing_missing-untracked
  ! content1_content1_missing-tracked
  ! content1_content2_missing-tracked
  ! content1_missing_missing-tracked
  ! missing_content2_missing-tracked
  ! missing_missing_missing-tracked
  ? missing_missing_content3-untracked

(create a simple text version of the content)

  $ python ../dircontent.py > ../content-wc.txt
  $ cat ../content-wc.txt
  content1 content1_content1_content1-tracked
  content1 content1_content1_content1-untracked
  content3 content1_content1_content3-tracked
  content3 content1_content1_content3-untracked
  content1 content1_content2_content1-tracked
  content1 content1_content2_content1-untracked
  content2 content1_content2_content2-tracked
  content2 content1_content2_content2-untracked
  content3 content1_content2_content3-tracked
  content3 content1_content2_content3-untracked
  content1 content1_missing_content1-tracked
  content1 content1_missing_content1-untracked
  content3 content1_missing_content3-tracked
  content3 content1_missing_content3-untracked
  content2 missing_content2_content2-tracked
  content2 missing_content2_content2-untracked
  content3 missing_content2_content3-tracked
  content3 missing_content2_content3-untracked
  content3 missing_missing_content3-tracked
  content3 missing_missing_content3-untracked

  $ cd ..

Test revert --all to parent content
-----------------------------------

(setup from reference repo)

  $ cp -r revert-ref revert-parent-all
  $ cd revert-parent-all

check revert output

  $ hg revert --all
  undeleting content1_content1_content1-untracked
  reverting content1_content1_content3-tracked
  undeleting content1_content1_content3-untracked
  reverting content1_content1_missing-tracked
  undeleting content1_content1_missing-untracked
  reverting content1_content2_content1-tracked
  undeleting content1_content2_content1-untracked
  undeleting content1_content2_content2-untracked
  reverting content1_content2_content3-tracked
  undeleting content1_content2_content3-untracked
  reverting content1_content2_missing-tracked
  undeleting content1_content2_missing-untracked
  forgetting content1_missing_content1-tracked
  forgetting content1_missing_content3-tracked
  forgetting content1_missing_missing-tracked
  undeleting missing_content2_content2-untracked
  reverting missing_content2_content3-tracked
  undeleting missing_content2_content3-untracked
  reverting missing_content2_missing-tracked
  undeleting missing_content2_missing-untracked
  forgetting missing_missing_content3-tracked
  forgetting missing_missing_missing-tracked

Compare resulting directory with revert target.

The diff is filtered to include change only. The only difference should be
additional `.orig` backup file when applicable.

  $ python ../dircontent.py > ../content-parent-all.txt
  $ cd ..
  $ diff -U 0 -- content-parent.txt content-parent-all.txt | grep _
  +content3 content1_content1_content3-tracked.orig
  +content3 content1_content1_content3-untracked.orig
  +content1 content1_content2_content1-tracked.orig
  +content1 content1_content2_content1-untracked.orig
  +content3 content1_content2_content3-tracked.orig
  +content3 content1_content2_content3-untracked.orig
  +content1 content1_missing_content1-tracked
  +content1 content1_missing_content1-untracked
  +content3 content1_missing_content3-tracked
  +content3 content1_missing_content3-untracked
  +content3 missing_content2_content3-tracked.orig
  +content3 missing_content2_content3-untracked.orig
  +content3 missing_missing_content3-tracked
  +content3 missing_missing_content3-untracked

Test revert --all to "base" content
-----------------------------------

(setup from reference repo)

  $ cp -r revert-ref revert-base-all
  $ cd revert-base-all

check revert output

  $ hg revert --all --rev 'desc(base)'
  undeleting content1_content1_content1-untracked
  reverting content1_content1_content3-tracked
  undeleting content1_content1_content3-untracked
  reverting content1_content1_missing-tracked
  undeleting content1_content1_missing-untracked
  undeleting content1_content2_content1-untracked
  reverting content1_content2_content2-tracked
  undeleting content1_content2_content2-untracked
  reverting content1_content2_content3-tracked
  undeleting content1_content2_content3-untracked
  reverting content1_content2_missing-tracked
  undeleting content1_content2_missing-untracked
  adding content1_missing_content1-untracked
  reverting content1_missing_content3-tracked
  adding content1_missing_content3-untracked
  reverting content1_missing_missing-tracked
  adding content1_missing_missing-untracked
  removing missing_content2_content2-tracked
  removing missing_content2_content3-tracked
  removing missing_content2_missing-tracked
  forgetting missing_missing_content3-tracked
  forgetting missing_missing_missing-tracked

Compare resulting directory with revert target.

The diff is filtered to include change only. The only difference should be
additional `.orig` backup file when applicable.

  $ python ../dircontent.py > ../content-base-all.txt
  $ cd ..
  $ diff -U 0 -- content-base.txt content-base-all.txt | grep _
  +content3 content1_content1_content3-tracked.orig
  +content3 content1_content1_content3-untracked.orig
  +content2 content1_content2_content2-untracked.orig
  +content3 content1_content2_content3-tracked.orig
  +content3 content1_content2_content3-untracked.orig
  +content3 content1_missing_content3-tracked.orig
  +content3 content1_missing_content3-untracked.orig
  +content2 missing_content2_content2-untracked
  +content3 missing_content2_content3-tracked.orig
  +content3 missing_content2_content3-untracked
  +content3 missing_missing_content3-tracked
  +content3 missing_missing_content3-untracked

Test revert to parent content with explicit file name
-----------------------------------------------------

(setup from reference repo)

  $ cp -r revert-ref revert-parent-explicit
  $ cd revert-parent-explicit

revert all files individually and check the output
(output is expected to be different than in the --all case)

  $ for file in `python $TESTDIR/generate-working-copy-states.py filelist 2`; do
  >   echo '### revert for:' $file;
  >   hg revert $file;
  >   echo
  > done
  ### revert for: content1_content1_content1-tracked
  no changes needed to content1_content1_content1-tracked
  
  ### revert for: content1_content1_content1-untracked
  
  ### revert for: content1_content1_content3-tracked
  
  ### revert for: content1_content1_content3-untracked
  
  ### revert for: content1_content1_missing-tracked
  
  ### revert for: content1_content1_missing-untracked
  
  ### revert for: content1_content2_content1-tracked
  
  ### revert for: content1_content2_content1-untracked
  
  ### revert for: content1_content2_content2-tracked
  no changes needed to content1_content2_content2-tracked
  
  ### revert for: content1_content2_content2-untracked
  
  ### revert for: content1_content2_content3-tracked
  
  ### revert for: content1_content2_content3-untracked
  
  ### revert for: content1_content2_missing-tracked
  
  ### revert for: content1_content2_missing-untracked
  
  ### revert for: content1_missing_content1-tracked
  
  ### revert for: content1_missing_content1-untracked
  file not managed: content1_missing_content1-untracked
  
  ### revert for: content1_missing_content3-tracked
  
  ### revert for: content1_missing_content3-untracked
  file not managed: content1_missing_content3-untracked
  
  ### revert for: content1_missing_missing-tracked
  
  ### revert for: content1_missing_missing-untracked
  content1_missing_missing-untracked: no such file in rev * (glob)
  
  ### revert for: missing_content2_content2-tracked
  no changes needed to missing_content2_content2-tracked
  
  ### revert for: missing_content2_content2-untracked
  
  ### revert for: missing_content2_content3-tracked
  
  ### revert for: missing_content2_content3-untracked
  
  ### revert for: missing_content2_missing-tracked
  
  ### revert for: missing_content2_missing-untracked
  
  ### revert for: missing_missing_content3-tracked
  
  ### revert for: missing_missing_content3-untracked
  file not managed: missing_missing_content3-untracked
  
  ### revert for: missing_missing_missing-tracked
  
  ### revert for: missing_missing_missing-untracked
  missing_missing_missing-untracked: no such file in rev * (glob)
  

check resulting directory against the --all run
(There should be no difference)

  $ python ../dircontent.py > ../content-parent-explicit.txt
  $ cd ..
  $ diff -U 0 -- content-parent-all.txt content-parent-explicit.txt | grep _
  [1]

Test revert to "base" content with explicit file name
-----------------------------------------------------

(setup from reference repo)

  $ cp -r revert-ref revert-base-explicit
  $ cd revert-base-explicit

revert all files individually and check the output
(output is expected to be different than in the --all case)

  $ for file in `python $TESTDIR/generate-working-copy-states.py filelist 2`; do
  >   echo '### revert for:' $file;
  >   hg revert $file --rev 'desc(base)';
  >   echo
  > done
  ### revert for: content1_content1_content1-tracked
  no changes needed to content1_content1_content1-tracked
  
  ### revert for: content1_content1_content1-untracked
  
  ### revert for: content1_content1_content3-tracked
  
  ### revert for: content1_content1_content3-untracked
  
  ### revert for: content1_content1_missing-tracked
  
  ### revert for: content1_content1_missing-untracked
  
  ### revert for: content1_content2_content1-tracked
  no changes needed to content1_content2_content1-tracked
  
  ### revert for: content1_content2_content1-untracked
  
  ### revert for: content1_content2_content2-tracked
  
  ### revert for: content1_content2_content2-untracked
  
  ### revert for: content1_content2_content3-tracked
  
  ### revert for: content1_content2_content3-untracked
  
  ### revert for: content1_content2_missing-tracked
  
  ### revert for: content1_content2_missing-untracked
  
  ### revert for: content1_missing_content1-tracked
  no changes needed to content1_missing_content1-tracked
  
  ### revert for: content1_missing_content1-untracked
  
  ### revert for: content1_missing_content3-tracked
  
  ### revert for: content1_missing_content3-untracked
  
  ### revert for: content1_missing_missing-tracked
  
  ### revert for: content1_missing_missing-untracked
  
  ### revert for: missing_content2_content2-tracked
  
  ### revert for: missing_content2_content2-untracked
  no changes needed to missing_content2_content2-untracked
  
  ### revert for: missing_content2_content3-tracked
  
  ### revert for: missing_content2_content3-untracked
  no changes needed to missing_content2_content3-untracked
  
  ### revert for: missing_content2_missing-tracked
  
  ### revert for: missing_content2_missing-untracked
  no changes needed to missing_content2_missing-untracked
  
  ### revert for: missing_missing_content3-tracked
  
  ### revert for: missing_missing_content3-untracked
  file not managed: missing_missing_content3-untracked
  
  ### revert for: missing_missing_missing-tracked
  
  ### revert for: missing_missing_missing-untracked
  missing_missing_missing-untracked: no such file in rev * (glob)
  

check resulting directory against the --all run
(There should be no difference)

  $ python ../dircontent.py > ../content-base-explicit.txt
  $ cd ..
  $ diff -U 0 -- content-base-all.txt content-base-explicit.txt | grep _
  [1]

Revert to an ancestor of P2 during a merge (issue5052)
-----------------------------------------------------

(prepare the repository)

  $ hg init issue5052
  $ cd issue5052
  $ echo '.\.orig' > .hgignore
  $ echo 0 > root
  $ hg ci -qAm C0
  $ echo 0 > A
  $ hg ci -qAm C1
  $ echo 1 >> A
  $ hg ci -qm C2
  $ hg up -q 0
  $ echo 1 > B
  $ hg ci -qAm C3
  $ hg status --rev 'ancestor(.,2)' --rev 2
  A A
  $ hg log -G -T '{rev} ({files})\n'
  @  3 (B)
  |
  | o  2 (A)
  | |
  | o  1 (A)
  |/
  o  0 (.hgignore root)
  

actual tests: reverting to something else than a merge parent

  $ hg merge
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  (branch merge, don't forget to commit)

  $ hg status --rev 'p1()'
  M A
  $ hg status --rev 'p2()'
  A B
  $ hg status --rev '1'
  M A
  A B
  $ hg revert --rev 1 --all
  reverting A
  removing B
  $ hg status --rev 1

From the other parents

  $ hg up -C 'p2()'
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg merge
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  (branch merge, don't forget to commit)

  $ hg status --rev 'p1()'
  M B
  $ hg status --rev 'p2()'
  A A
  $ hg status --rev '1'
  M A
  A B
  $ hg revert --rev 1 --all
  reverting A
  removing B
  $ hg status --rev 1

  $ cd ..