view tests/test-resolve.t @ 47010:76ae43d5b1db stable

repoview: fix memory leak of filtered repo classes

The leak occurs in long-running server processes with
extensions, and is measured at 110kB per request.

Before this change, the contents of the `_filteredrepotypes`
cache are not properly garbage collected, despite it begin
a `WeakKeyDictionary`.

Extensions have a tendency to generate a new repository class
for each `localrepo` instantiation. Server processes based
on `hgwebdir_mod` will instantiate a new `localrepo` for each
HTTP request that involves a repository.

As a result, with a testing process that repeatedly opens a
repository with several extensions activated
(`topic` notably among them), we see a steady increase in
resident memory of 110kB per repository instantiation before this
change. This is also true, if we call `gc.collect()` at each
instantiation, like `hgwebdir_mod` does, or not.

The cause of the leak is that the *values* aren't weak references.
This change uses `weakref.ref` for the values, and this makes
in our measurements the resident size increase drop to 5kB per
repository instantiation, with no explicit call of `gc.collect()`
at all.
There is currently no reason to believe that this remaining leak
of 5kB is related to or even due to Mercurial core.

We've also seen evidence that `ui.ui` instances weren't properly
garbage collected before the change (with the change, they are).
This could explain why the figures are relatively high.

In theory, the collection of weak references could lead to
much more misses in the cache, so we measured the impact on
the original case that was motivation for introducing that cache
in 7e89bd0cfb86 (see also issue5043): `hg convert` of the
mozilla-central repository. The bad news here is that there is a
major memory leak there, both with and without the present changeset.
There were no more cache misses, and we could see no
more memory leak with this change: the resident size after importing
roughly 100000 changesets was at 12.4GB before, and 12.5GB after.
The small increase is mentioned for completeness only, and we
believe that it should be ignored, at least as long as the main
leak isn't fixed. At less than 1% of the main leak, even finding out
whether it is merely noise would be wasteful.

Original context where this was spotted and first mitigated:
  https://foss.heptapod.net/heptapod/heptapod/-/issues/466

The leak reduction was also obtained in Heptapod inner HTTP server,
which amounts to the same as `hgwebdir_mod` for these questions.

The measurements done with Python 3.9, similar figures seen with 3.8.
More work on our side would be needed to give measurements with 2.7,
because of testing server process does not support it.

test that a commit clears the merge state.

  $ hg init repo
  $ cd repo

  $ echo foo > file1
  $ echo foo > file2
  $ hg commit -Am 'add files'
  adding file1
  adding file2

  $ echo bar >> file1
  $ echo bar >> file2
  $ hg commit -Am 'append bar to files'

create a second head with conflicting edits

  $ hg up -C 0
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ echo baz >> file1
  $ echo baz >> file2
  $ hg commit -Am 'append baz to files'
  created new head

create a third head with no conflicting edits
  $ hg up -qC 0
  $ echo foo > file3
  $ hg commit -Am 'add non-conflicting file'
  adding file3
  created new head

failing merge

  $ hg up -qC 2
  $ hg merge --tool=internal:fail 1
  0 files updated, 0 files merged, 0 files removed, 2 files unresolved
  use 'hg resolve' to retry unresolved file merges or 'hg merge --abort' to abandon
  [1]

resolve -l should contain unresolved entries

  $ hg resolve -l
  U file1
  U file2

  $ hg resolve -l --no-status
  file1
  file2

resolving an unknown path should emit a warning, but not for -l

  $ hg resolve -m does-not-exist
  arguments do not match paths that need resolving
  $ hg resolve -l does-not-exist

tell users how they could have used resolve

  $ mkdir nested
  $ cd nested
  $ hg resolve -m file1
  arguments do not match paths that need resolving
  (try: hg resolve -m path:file1)
  $ hg resolve -m file1 filez
  arguments do not match paths that need resolving
  (try: hg resolve -m path:file1 path:filez)
  $ hg resolve -m path:file1 path:filez
  $ hg resolve -l
  R file1
  U file2
  $ hg resolve -l --config ui.relative-paths=yes
  R ../file1
  U ../file2
  $ hg resolve --re-merge filez file2
  arguments do not match paths that need resolving
  (try: hg resolve --re-merge path:filez path:file2)
  $ hg resolve -m filez file2
  arguments do not match paths that need resolving
  (try: hg resolve -m path:filez path:file2)
  $ hg resolve -m path:filez path:file2
  (no more unresolved files)
  $ hg resolve -l
  R file1
  R file2

cleanup
  $ hg resolve -u
  $ cd ..
  $ rmdir nested

resolve the failure

  $ echo resolved > file1
  $ hg resolve -m file1

resolve -l should show resolved file as resolved

  $ hg resolve -l
  R file1
  U file2

  $ hg resolve -l -Tjson
  [
   {
    "mergestatus": "R",
    "path": "file1"
   },
   {
    "mergestatus": "U",
    "path": "file2"
   }
  ]

  $ hg resolve -l -T '{path} {mergestatus} {status} {p1rev} {p2rev}\n'
  file1 R M 2 1
  file2 U M 2 1

resolve -m without paths should mark all resolved

  $ hg resolve -m
  (no more unresolved files)
  $ hg commit -m 'resolved'

resolve -l should be empty after commit

  $ hg resolve -l

  $ hg resolve -l -Tjson
  [
  ]

resolve --all should abort when no merge in progress

  $ hg resolve --all
  abort: resolve command not applicable when not merging
  [20]

resolve -m should abort when no merge in progress

  $ hg resolve -m
  abort: resolve command not applicable when not merging
  [20]

can not update or merge when there are unresolved conflicts

  $ hg up -qC 0
  $ echo quux >> file1
  $ hg up 1
  merging file1
  warning: conflicts while merging file1! (edit, then use 'hg resolve --mark')
  1 files updated, 0 files merged, 0 files removed, 1 files unresolved
  use 'hg resolve' to retry unresolved file merges
  [1]
  $ hg up 0
  abort: outstanding merge conflicts
  (use 'hg resolve' to resolve)
  [20]
  $ hg merge 2
  abort: outstanding merge conflicts
  (use 'hg resolve' to resolve)
  [20]
  $ hg merge --force 2
  abort: outstanding merge conflicts
  (use 'hg resolve' to resolve)
  [20]

set up conflict-free merge

  $ hg up -qC 3
  $ hg merge 1
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  (branch merge, don't forget to commit)

resolve --all should do nothing in merge without conflicts
  $ hg resolve --all
  (no more unresolved files)

resolve -m should do nothing in merge without conflicts

  $ hg resolve -m
  (no more unresolved files)

get back to conflicting state

  $ hg up -qC 2
  $ hg merge --tool=internal:fail 1
  0 files updated, 0 files merged, 0 files removed, 2 files unresolved
  use 'hg resolve' to retry unresolved file merges or 'hg merge --abort' to abandon
  [1]

resolve without arguments should suggest --all
  $ hg resolve
  abort: no files or directories specified
  (use --all to re-merge all unresolved files)
  [10]

resolve --all should re-merge all unresolved files
  $ hg resolve --all
  merging file1
  merging file2
  warning: conflicts while merging file1! (edit, then use 'hg resolve --mark')
  warning: conflicts while merging file2! (edit, then use 'hg resolve --mark')
  [1]
  $ cat file1.orig
  foo
  baz
  $ cat file2.orig
  foo
  baz

.orig files should exists where specified
  $ hg resolve --all --verbose --config 'ui.origbackuppath=.hg/origbackups'
  merging file1
  creating directory: $TESTTMP/repo/.hg/origbackups
  merging file2
  warning: conflicts while merging file1! (edit, then use 'hg resolve --mark')
  warning: conflicts while merging file2! (edit, then use 'hg resolve --mark')
  [1]
  $ ls .hg/origbackups
  file1
  file2
  $ grep '<<<' file1 > /dev/null
  $ grep '<<<' file2 > /dev/null

resolve <file> should re-merge file
  $ echo resolved > file1
  $ hg resolve -q file1
  warning: conflicts while merging file1! (edit, then use 'hg resolve --mark')
  [1]
  $ grep '<<<' file1 > /dev/null

test .orig behavior with resolve

  $ hg resolve -q file1 --tool "sh -c 'f --dump \"$TESTTMP/repo/file1.orig\"'"
  $TESTTMP/repo/file1.orig:
  >>>
  foo
  baz
  <<<

resolve <file> should do nothing if 'file' was marked resolved
  $ echo resolved > file1
  $ hg resolve -m file1
  $ hg resolve -q file1
  $ cat file1
  resolved

insert unsupported advisory merge record

  $ hg --config extensions.fakemergerecord=$TESTDIR/fakemergerecord.py fakemergerecord -x
  $ hg debugmergestate
  local (working copy): 57653b9f834a4493f7240b0681efcb9ae7cab745
  other (merge rev): dc77451844e37f03f5c559e3b8529b2b48d381d1
  file: file1 (state "r")
    local path: file1 (hash 60b27f004e454aca81b0480209cce5081ec52390, flags "")
    ancestor path: file1 (node 2ed2a3912a0b24502043eae84ee4b279c18b90dd)
    other path: file1 (node 6f4310b00b9a147241b071a60c28a650827fb03d)
    extra: ancestorlinknode = 99726c03216e233810a2564cbc0adfe395007eac
    extra: merged = yes
  file: file2 (state "u")
    local path: file2 (hash cb99b709a1978bd205ab9dfd4c5aaa1fc91c7523, flags "")
    ancestor path: file2 (node 2ed2a3912a0b24502043eae84ee4b279c18b90dd)
    other path: file2 (node 6f4310b00b9a147241b071a60c28a650827fb03d)
    extra: ancestorlinknode = 99726c03216e233810a2564cbc0adfe395007eac
    extra: merged = yes
  $ hg resolve -l
  R file1
  U file2

test json output

  $ hg debugmergestate -T json
  [
   {
    "commits": [{"label": "working copy", "name": "local", "node": "57653b9f834a4493f7240b0681efcb9ae7cab745"}, {"label": "merge rev", "name": "other", "node": "dc77451844e37f03f5c559e3b8529b2b48d381d1"}],
    "extras": [],
    "files": [{"ancestor_node": "2ed2a3912a0b24502043eae84ee4b279c18b90dd", "ancestor_path": "file1", "extras": [{"key": "ancestorlinknode", "value": "99726c03216e233810a2564cbc0adfe395007eac"}, {"key": "merged", "value": "yes"}], "local_flags": "", "local_key": "60b27f004e454aca81b0480209cce5081ec52390", "local_path": "file1", "other_node": "6f4310b00b9a147241b071a60c28a650827fb03d", "other_path": "file1", "path": "file1", "state": "r"}, {"ancestor_node": "2ed2a3912a0b24502043eae84ee4b279c18b90dd", "ancestor_path": "file2", "extras": [{"key": "ancestorlinknode", "value": "99726c03216e233810a2564cbc0adfe395007eac"}, {"key": "merged", "value": "yes"}], "local_flags": "", "local_key": "cb99b709a1978bd205ab9dfd4c5aaa1fc91c7523", "local_path": "file2", "other_node": "6f4310b00b9a147241b071a60c28a650827fb03d", "other_path": "file2", "path": "file2", "state": "u"}]
   }
  ]


insert unsupported mandatory merge record

  $ hg --config extensions.fakemergerecord=$TESTDIR/fakemergerecord.py fakemergerecord -X
  $ hg debugmergestate
  abort: unsupported merge state records: X
  (see https://mercurial-scm.org/wiki/MergeStateRecords for more information)
  [255]
  $ hg resolve -l
  abort: unsupported merge state records: X
  (see https://mercurial-scm.org/wiki/MergeStateRecords for more information)
  [255]
  $ hg resolve -ma
  abort: unsupported merge state records: X
  (see https://mercurial-scm.org/wiki/MergeStateRecords for more information)
  [255]
  $ hg summary
  warning: merge state has unsupported record types: X
  parent: 2:57653b9f834a 
   append baz to files
  parent: 1:dc77451844e3 
   append bar to files
  branch: default
  commit: 2 modified, 2 unknown (merge)
  update: 2 new changesets (update)
  phases: 5 draft

update --clean shouldn't abort on unsupported records

  $ hg up -qC 1
  $ hg debugmergestate
  no merge state found

test crashed merge with empty mergestate

  $ mkdir .hg/merge
  $ touch .hg/merge/state

resolve -l should be empty

  $ hg resolve -l

resolve -m can be configured to look for remaining conflict markers
  $ hg up -qC 2
  $ hg merge -q --tool=internal:merge 1
  warning: conflicts while merging file1! (edit, then use 'hg resolve --mark')
  warning: conflicts while merging file2! (edit, then use 'hg resolve --mark')
  [1]
  $ hg resolve -l
  U file1
  U file2
  $ echo 'remove markers' > file1
  $ hg --config commands.resolve.mark-check=abort resolve -m
  warning: the following files still have conflict markers:
    file2
  abort: conflict markers detected
  (use --all to mark anyway)
  [20]
  $ hg resolve -l
  U file1
  U file2
Try with --all from the hint
  $ hg --config commands.resolve.mark-check=abort resolve -m --all
  warning: the following files still have conflict markers:
    file2
  (no more unresolved files)
  $ hg resolve -l
  R file1
  R file2
Test with :mergediff conflict markers
  $ hg resolve --unmark
  $ hg resolve --re-merge -t :mergediff file2
  merging file2
  warning: conflicts while merging file2! (edit, then use 'hg resolve --mark')
  [1]
  $ hg resolve -l
  U file1
  U file2
  $ hg --config commands.resolve.mark-check=abort resolve -m
  warning: the following files still have conflict markers:
    file2
  abort: conflict markers detected
  (use --all to mark anyway)
  [20]
  $ hg resolve -l
  U file1
  U file2
Test option value 'warn'
  $ hg resolve --unmark
  $ hg resolve -l
  U file1
  U file2
  $ hg --config commands.resolve.mark-check=warn resolve -m
  warning: the following files still have conflict markers:
    file2
  (no more unresolved files)
  $ hg resolve -l
  R file1
  R file2
If the file is already marked as resolved, we don't warn about it
  $ hg resolve --unmark file1
  $ hg resolve -l
  U file1
  R file2
  $ hg --config commands.resolve.mark-check=warn resolve -m
  (no more unresolved files)
  $ hg resolve -l
  R file1
  R file2
If the user passes an invalid value, we treat it as 'none'.
  $ hg resolve --unmark
  $ hg resolve -l
  U file1
  U file2
  $ hg --config commands.resolve.mark-check=nope resolve -m
  (no more unresolved files)
  $ hg resolve -l
  R file1
  R file2
Test explicitly setting the option to 'none'
  $ hg resolve --unmark
  $ hg resolve -l
  U file1
  U file2
  $ hg --config commands.resolve.mark-check=none resolve -m
  (no more unresolved files)
  $ hg resolve -l
  R file1
  R file2
Test with marking an explicit file as resolved, this should not abort (since
there's no --force flag, we have no way of combining --all with a filename)
  $ hg resolve --unmark
  $ hg resolve -l
  U file1
  U file2
(This downgrades to a warning since an explicit file was specified).
  $ hg --config commands.resolve.mark-check=abort resolve -m file2
  warning: the following files still have conflict markers:
    file2
  $ hg resolve -l
  U file1
  R file2
Testing the --re-merge flag
  $ hg resolve --unmark file1
  $ hg resolve -l
  U file1
  R file2
  $ hg resolve --mark --re-merge
  abort: too many actions specified
  [10]
  $ hg resolve --re-merge --all
  merging file1
  warning: conflicts while merging file1! (edit, then use 'hg resolve --mark')
  [1]
Explicit re-merge
  $ hg resolve --unmark file1
  $ hg resolve --config commands.resolve.explicit-re-merge=1 --all
  abort: no action specified
  (use --mark, --unmark, --list or --re-merge)
  [10]
  $ hg resolve --config commands.resolve.explicit-re-merge=1 --re-merge --all
  merging file1
  warning: conflicts while merging file1! (edit, then use 'hg resolve --mark')
  [1]

  $ cd ..

======================================================
Test 'hg resolve' confirm config option functionality |
======================================================
  $ cat >> $HGRCPATH << EOF
  > [extensions]
  > rebase=
  > EOF

  $ hg init repo2
  $ cd repo2

  $ echo boss > boss
  $ hg ci -Am "add boss"
  adding boss

  $ for emp in emp1 emp2 emp3; do echo work > $emp; done;
  $ hg ci -Aqm "added emp1 emp2 emp3"

  $ hg up 0
  0 files updated, 0 files merged, 3 files removed, 0 files unresolved

  $ for emp in emp1 emp2 emp3; do echo nowork > $emp; done;
  $ hg ci -Aqm "added lazy emp1 emp2 emp3"

  $ hg log -GT "{rev} {node|short} {firstline(desc)}\n"
  @  2 0acfd4a49af0 added lazy emp1 emp2 emp3
  |
  | o  1 f30f98a8181f added emp1 emp2 emp3
  |/
  o  0 88660038d466 add boss
  
  $ hg rebase -s 1 -d 2
  rebasing 1:f30f98a8181f "added emp1 emp2 emp3"
  merging emp1
  merging emp2
  merging emp3
  warning: conflicts while merging emp1! (edit, then use 'hg resolve --mark')
  warning: conflicts while merging emp2! (edit, then use 'hg resolve --mark')
  warning: conflicts while merging emp3! (edit, then use 'hg resolve --mark')
  unresolved conflicts (see 'hg resolve', then 'hg rebase --continue')
  [240]

Test when commands.resolve.confirm config option is not set:
===========================================================
  $ hg resolve --all
  merging emp1
  merging emp2
  merging emp3
  warning: conflicts while merging emp1! (edit, then use 'hg resolve --mark')
  warning: conflicts while merging emp2! (edit, then use 'hg resolve --mark')
  warning: conflicts while merging emp3! (edit, then use 'hg resolve --mark')
  [1]

Test when config option is set:
==============================
  $ cat >> .hg/hgrc << EOF
  > [ui]
  > interactive = True
  > [commands]
  > resolve.confirm = True
  > EOF

  $ hg resolve
  abort: no files or directories specified
  (use --all to re-merge all unresolved files)
  [10]
  $ hg resolve --all << EOF
  > n
  > EOF
  re-merge all unresolved files (yn)? n
  abort: user quit
  [250]

  $ hg resolve --all << EOF
  > y
  > EOF
  re-merge all unresolved files (yn)? y
  merging emp1
  merging emp2
  merging emp3
  warning: conflicts while merging emp1! (edit, then use 'hg resolve --mark')
  warning: conflicts while merging emp2! (edit, then use 'hg resolve --mark')
  warning: conflicts while merging emp3! (edit, then use 'hg resolve --mark')
  [1]

Test that commands.resolve.confirm respect --mark option (only when no patterns args are given):
===============================================================================================

  $ hg resolve -m emp1
  $ hg resolve -l
  R emp1
  U emp2
  U emp3

  $ hg resolve -m << EOF
  > n
  > EOF
  mark all unresolved files as resolved (yn)? n
  abort: user quit
  [250]

  $ hg resolve -m << EOF
  > y
  > EOF
  mark all unresolved files as resolved (yn)? y
  (no more unresolved files)
  continue: hg rebase --continue
  $ hg resolve -l
  R emp1
  R emp2
  R emp3

Test that commands.resolve.confirm respect --unmark option (only when no patterns args are given):
=================================================================================================

  $ hg resolve -u emp1

  $ hg resolve -l
  U emp1
  R emp2
  R emp3

  $ hg resolve -u << EOF
  > n
  > EOF
  mark all resolved files as unresolved (yn)? n
  abort: user quit
  [250]

  $ hg resolve -m << EOF
  > y
  > EOF
  mark all unresolved files as resolved (yn)? y
  (no more unresolved files)
  continue: hg rebase --continue

  $ hg resolve -l
  R emp1
  R emp2
  R emp3

  $ hg rebase --abort
  rebase aborted

Done with commands.resolve.confirm tests:
  $ cd ..

Test that commands.resolve.mark-check works even if there are deleted files:
  $ hg init resolve-deleted
  $ cd resolve-deleted
  $ echo r0 > file1
  $ hg ci -qAm r0
  $ echo r1 > file1
  $ hg ci -qm r1
  $ hg co -qr 0
  $ hg rm file1
  $ hg ci -qm "r2 (delete file1)"

(At this point we have r0 creating file1, and sibling commits r1 and r2, which
 modify and delete file1, respectively)

  $ hg merge -r 1
  file 'file1' was deleted in local [working copy] but was modified in other [merge rev].
  You can use (c)hanged version, leave (d)eleted, or leave (u)nresolved.
  What do you want to do? u
  0 files updated, 0 files merged, 0 files removed, 1 files unresolved
  use 'hg resolve' to retry unresolved file merges or 'hg merge --abort' to abandon
  [1]
  $ hg resolve --list
  U file1
Because we left it as 'unresolved' the file should still exist.
  $ [ -f file1 ] || echo "File does not exist?"
BC behavior: `hg resolve --mark` accepts that the file is still there, and
doesn't have a problem with this situation.
  $ hg resolve --mark --config commands.resolve.mark-check=abort
  (no more unresolved files)
  $ hg resolve --list
  R file1
The file is still there:
  $ [ -f file1 ] || echo "File does not exist?"
Let's check mark-check=warn:
  $ hg resolve --unmark file1
  $ hg resolve --mark --config commands.resolve.mark-check=warn
  (no more unresolved files)
  $ hg resolve --list
  R file1
The file is still there:
  $ [ -f file1 ] || echo "File does not exist?"
Let's resolve the issue by deleting the file via `hg resolve`
  $ hg resolve --unmark file1
  $ echo 'd' | hg resolve file1 --config ui.interactive=1
  file 'file1' was deleted in local [working copy] but was modified in other [merge rev].
  You can use (c)hanged version, leave (d)eleted, or leave (u)nresolved.
  What do you want to do? d
  (no more unresolved files)
  $ hg resolve --list
  R file1
The file is deleted:
  $ [ -f file1 ] && echo "File still exists?" || true
Doing `hg resolve --mark` doesn't break now that the file is missing:
  $ hg resolve --mark --config commands.resolve.mark-check=abort
  (no more unresolved files)
  $ hg resolve --mark --config commands.resolve.mark-check=warn
  (no more unresolved files)
Resurrect the file, and delete it outside of hg:
  $ hg resolve --unmark file1
  $ hg resolve file1
  file 'file1' was deleted in local [working copy] but was modified in other [merge rev].
  You can use (c)hanged version, leave (d)eleted, or leave (u)nresolved.
  What do you want to do? u
  [1]
  $ [ -f file1 ] || echo "File does not exist?"
  $ hg resolve --list
  U file1
  $ rm file1
  $ hg resolve --mark --config commands.resolve.mark-check=abort
  (no more unresolved files)
  $ hg resolve --list
  R file1
  $ hg resolve --unmark file1
  $ hg resolve file1
  file 'file1' was deleted in local [working copy] but was modified in other [merge rev].
  You can use (c)hanged version, leave (d)eleted, or leave (u)nresolved.
  What do you want to do? u
  [1]
  $ [ -f file1 ] || echo "File does not exist?"
  $ hg resolve --list
  U file1
  $ rm file1
  $ hg resolve --mark --config commands.resolve.mark-check=warn
  (no more unresolved files)
  $ hg resolve --list
  R file1


For completeness, let's try that in the opposite direction (merging r2 into r1,
instead of r1 into r2):
  $ hg update -qCr 1
  $ hg merge -r 2
  file 'file1' was deleted in other [merge rev] but was modified in local [working copy].
  You can use (c)hanged version, (d)elete, or leave (u)nresolved.
  What do you want to do? u
  0 files updated, 0 files merged, 0 files removed, 1 files unresolved
  use 'hg resolve' to retry unresolved file merges or 'hg merge --abort' to abandon
  [1]
  $ hg resolve --list
  U file1
Because we left it as 'unresolved' the file should still exist.
  $ [ -f file1 ] || echo "File does not exist?"
BC behavior: `hg resolve --mark` accepts that the file is still there, and
doesn't have a problem with this situation.
  $ hg resolve --mark --config commands.resolve.mark-check=abort
  (no more unresolved files)
  $ hg resolve --list
  R file1
The file is still there:
  $ [ -f file1 ] || echo "File does not exist?"
Let's check mark-check=warn:
  $ hg resolve --unmark file1
  $ hg resolve --mark --config commands.resolve.mark-check=warn
  (no more unresolved files)
  $ hg resolve --list
  R file1
The file is still there:
  $ [ -f file1 ] || echo "File does not exist?"
Let's resolve the issue by deleting the file via `hg resolve`
  $ hg resolve --unmark file1
  $ echo 'd' | hg resolve file1 --config ui.interactive=1
  file 'file1' was deleted in other [merge rev] but was modified in local [working copy].
  You can use (c)hanged version, (d)elete, or leave (u)nresolved.
  What do you want to do? d
  (no more unresolved files)
  $ hg resolve --list
  R file1
The file is deleted:
  $ [ -f file1 ] && echo "File still exists?" || true
Doing `hg resolve --mark` doesn't break now that the file is missing:
  $ hg resolve --mark --config commands.resolve.mark-check=abort
  (no more unresolved files)
  $ hg resolve --mark --config commands.resolve.mark-check=warn
  (no more unresolved files)
Resurrect the file, and delete it outside of hg:
  $ hg resolve --unmark file1
  $ hg resolve file1
  file 'file1' was deleted in other [merge rev] but was modified in local [working copy].
  You can use (c)hanged version, (d)elete, or leave (u)nresolved.
  What do you want to do? u
  [1]
  $ [ -f file1 ] || echo "File does not exist?"
  $ hg resolve --list
  U file1
  $ rm file1
  $ hg resolve --mark --config commands.resolve.mark-check=abort
  (no more unresolved files)
  $ hg resolve --list
  R file1
  $ hg resolve --unmark file1
  $ hg resolve file1
  file 'file1' was deleted in other [merge rev] but was modified in local [working copy].
  You can use (c)hanged version, (d)elete, or leave (u)nresolved.
  What do you want to do? u
  [1]
  $ [ -f file1 ] || echo "File does not exist?"
  $ hg resolve --list
  U file1
  $ rm file1
  $ hg resolve --mark --config commands.resolve.mark-check=warn
  (no more unresolved files)
  $ hg resolve --list
  R file1

  $ cd ..