view tests/test-strip.t @ 40326:fed697fa1734

sqlitestore: file storage backend using SQLite

This commit provides an extension which uses SQLite to store file
data (as opposed to revlogs).

As the inline documentation describes, there are still several
aspects to the extension that are incomplete. But it's a start.
The extension does support basic clone, checkout, and commit
workflows, which makes it suitable for simple use cases.

One notable missing feature is support for "bundlerepos." This is
probably responsible for the most test failures when the extension
is activated as part of the test suite.

All revision data is stored in SQLite. Data is stored as zstd
compressed chunks (default if zstd is available), zlib compressed
chunks (default if zstd is not available), or raw chunks (if
configured or if a compressed delta is not smaller than the raw
delta). This makes things very similar to revlogs.

Unlike revlogs, the extension doesn't yet enforce a limit on delta
chain length. This is an obvious limitation and should be addressed.
This is somewhat mitigated by the use of zstd, which is much faster
than zlib to decompress.

There is a dedicated table for storing deltas. Deltas are stored
by the SHA-1 hash of their uncompressed content. The "fileindex" table
has columns that reference the delta for each revision and the base
delta that delta should be applied against. A recursive SQL query
is used to resolve the delta chain along with the delta data.

By storing deltas by hash, we are able to de-duplicate delta storage!
With revlogs, the same deltas in different revlogs would result in
duplicate storage of that delta. In this scheme, inserting the
duplicate delta is a no-op and delta chains simply reference the
existing delta.

When initially implementing this extension, I did not have
content-indexed deltas and deltas could be duplicated across files
(just like revlogs). When I implemented content-indexed deltas, the
size of the SQLite database for a full clone of mozilla-unified
dropped:

before: 2,554,261,504 bytes
after:  2,488,754,176 bytes

Surprisingly, this is still larger than the bytes size of revlog
files:

revlog files: 2,104,861,230 bytes
du -b:        2,254,381,614

I would have expected storage to be smaller since we're not limiting
delta chain length and since we're using zstd instead of zlib. I
suspect the SQLite indexes and per-column overhead account for the
bulk of the differences. (Keep in mind that revlog uses a 64-byte
packed struct for revision index data and deltas are stored without
padding. Aside from the 12 unused bytes in the 32 byte node field,
revlogs are pretty efficient.) Another source of overhead is file
name storage. With revlogs, file names are stored in the filesystem.
But with SQLite, we need to store file names in the database. This is
roughly equivalent to the size of the fncache file, which for the
mozilla-unified repository is ~34MB.

Since the SQLite database isn't append-only and since delta chains
can reference any delta, this opens some interesting possibilities.
For example, we could store deltas in reverse, such that fulltexts
are stored for newer revisions and deltas are applied to reconstruct
older revisions. This is likely a more optimal storage strategy for
version control, as new data tends to be more frequently accessed
than old data. We would obviously need wire protocol support for
transferring revision data from newest to oldest. And we would
probably need some kind of mechanism for "re-encoding" stores. But
it should be doable.

This extension is very much experimental quality. There are a handful
of features that don't work. It probably isn't suitable for day-to-day
use. But it could be used in limited cases (e.g. read-only checkouts
like in CI). And it is also a good proving ground for alternate
storage backends. As we continue to define interfaces for all things
storage, it will be useful to have a viable alternate storage backend
to see how things shake out in practice.

test-storage.py passes on Python 2 and introduces no new test failures on
Python 3. Having the storage-level unit tests has proved to be insanely
useful when developing this extension. Those tests caught numerous bugs
during development and I'm convinced this style of testing is the way
forward for ensuring alternate storage backends work as intended. Of
course, test coverage isn't close to what it needs to be. But it is
a start. And what coverage we have gives me confidence that basic store
functionality is implemented properly.

Differential Revision: https://phab.mercurial-scm.org/D4928

  $ echo "[extensions]" >> $HGRCPATH
  $ echo "strip=" >> $HGRCPATH
  $ echo "drawdag=$TESTDIR/drawdag.py" >> $HGRCPATH

  $ restore() {
  >     hg unbundle -q .hg/strip-backup/*
  >     rm .hg/strip-backup/*
  > }
  $ teststrip() {
  >     hg up -C $1
  >     echo % before update $1, strip $2
  >     hg parents
  >     hg --traceback strip $2
  >     echo % after update $1, strip $2
  >     hg parents
  >     restore
  > }

  $ hg init test
  $ cd test

  $ echo foo > bar
  $ hg ci -Ama
  adding bar

  $ echo more >> bar
  $ hg ci -Amb

  $ echo blah >> bar
  $ hg ci -Amc

  $ hg up 1
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ echo blah >> bar
  $ hg ci -Amd
  created new head

  $ echo final >> bar
  $ hg ci -Ame

  $ hg log
  changeset:   4:443431ffac4f
  tag:         tip
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     e
  
  changeset:   3:65bd5f99a4a3
  parent:      1:ef3a871183d7
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     d
  
  changeset:   2:264128213d29
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     c
  
  changeset:   1:ef3a871183d7
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     b
  
  changeset:   0:9ab35a2d17cb
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     a
  

  $ teststrip 4 4
  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
  % before update 4, strip 4
  changeset:   4:443431ffac4f
  tag:         tip
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     e
  
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  saved backup bundle to $TESTTMP/test/.hg/strip-backup/*-backup.hg (glob)
  % after update 4, strip 4
  changeset:   3:65bd5f99a4a3
  tag:         tip
  parent:      1:ef3a871183d7
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     d
  
  $ teststrip 4 3
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  % before update 4, strip 3
  changeset:   4:443431ffac4f
  tag:         tip
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     e
  
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  saved backup bundle to $TESTTMP/test/.hg/strip-backup/*-backup.hg (glob)
  % after update 4, strip 3
  changeset:   1:ef3a871183d7
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     b
  
  $ teststrip 1 4
  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
  % before update 1, strip 4
  changeset:   1:ef3a871183d7
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     b
  
  saved backup bundle to $TESTTMP/test/.hg/strip-backup/*-backup.hg (glob)
  % after update 1, strip 4
  changeset:   1:ef3a871183d7
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     b
  
  $ teststrip 4 2
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  % before update 4, strip 2
  changeset:   4:443431ffac4f
  tag:         tip
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     e
  
  saved backup bundle to $TESTTMP/test/.hg/strip-backup/*-backup.hg (glob)
  % after update 4, strip 2
  changeset:   3:443431ffac4f
  tag:         tip
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     e
  
  $ teststrip 4 1
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  % before update 4, strip 1
  changeset:   4:264128213d29
  tag:         tip
  parent:      1:ef3a871183d7
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     c
  
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  saved backup bundle to $TESTTMP/test/.hg/strip-backup/*-backup.hg (glob)
  % after update 4, strip 1
  changeset:   0:9ab35a2d17cb
  tag:         tip
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     a
  
  $ teststrip null 4
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  % before update null, strip 4
  saved backup bundle to $TESTTMP/test/.hg/strip-backup/*-backup.hg (glob)
  % after update null, strip 4

  $ hg log
  changeset:   4:264128213d29
  tag:         tip
  parent:      1:ef3a871183d7
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     c
  
  changeset:   3:443431ffac4f
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     e
  
  changeset:   2:65bd5f99a4a3
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     d
  
  changeset:   1:ef3a871183d7
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     b
  
  changeset:   0:9ab35a2d17cb
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     a
  
  $ hg up -C 4
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg parents
  changeset:   4:264128213d29
  tag:         tip
  parent:      1:ef3a871183d7
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     c
  

  $ hg --traceback strip 4
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  saved backup bundle to $TESTTMP/test/.hg/strip-backup/264128213d29-0b39d6bf-backup.hg
  $ hg parents
  changeset:   1:ef3a871183d7
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     b
  
  $ hg debugbundle .hg/strip-backup/*
  Stream params: {Compression: BZ}
  changegroup -- {nbchanges: 1, version: 02} (mandatory: True)
      264128213d290d868c54642d13aeaa3675551a78
  cache:rev-branch-cache -- {} (mandatory: False)
  phase-heads -- {} (mandatory: True)
      264128213d290d868c54642d13aeaa3675551a78 draft
  $ hg unbundle .hg/strip-backup/*
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 0 changes to 1 files (+1 heads)
  new changesets 264128213d29 (1 drafts)
  (run 'hg heads' to see heads, 'hg merge' to merge)
  $ rm .hg/strip-backup/*
  $ hg log --graph
  o  changeset:   4:264128213d29
  |  tag:         tip
  |  parent:      1:ef3a871183d7
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     c
  |
  | o  changeset:   3:443431ffac4f
  | |  user:        test
  | |  date:        Thu Jan 01 00:00:00 1970 +0000
  | |  summary:     e
  | |
  | o  changeset:   2:65bd5f99a4a3
  |/   user:        test
  |    date:        Thu Jan 01 00:00:00 1970 +0000
  |    summary:     d
  |
  @  changeset:   1:ef3a871183d7
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     b
  |
  o  changeset:   0:9ab35a2d17cb
     user:        test
     date:        Thu Jan 01 00:00:00 1970 +0000
     summary:     a
  
  $ hg up -C 2
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg merge 4
  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
  (branch merge, don't forget to commit)

before strip of merge parent

  $ hg parents
  changeset:   2:65bd5f99a4a3
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     d
  
  changeset:   4:264128213d29
  tag:         tip
  parent:      1:ef3a871183d7
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     c
  
  $ hg strip 4
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  saved backup bundle to $TESTTMP/test/.hg/strip-backup/*-backup.hg (glob)

after strip of merge parent

  $ hg parents
  changeset:   1:ef3a871183d7
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     b
  
  $ restore

  $ hg up
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  updated to "264128213d29: c"
  1 other heads for branch "default"
  $ hg log -G
  @  changeset:   4:264128213d29
  |  tag:         tip
  |  parent:      1:ef3a871183d7
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     c
  |
  | o  changeset:   3:443431ffac4f
  | |  user:        test
  | |  date:        Thu Jan 01 00:00:00 1970 +0000
  | |  summary:     e
  | |
  | o  changeset:   2:65bd5f99a4a3
  |/   user:        test
  |    date:        Thu Jan 01 00:00:00 1970 +0000
  |    summary:     d
  |
  o  changeset:   1:ef3a871183d7
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     b
  |
  o  changeset:   0:9ab35a2d17cb
     user:        test
     date:        Thu Jan 01 00:00:00 1970 +0000
     summary:     a
  

2 is parent of 3, only one strip should happen

  $ hg strip "roots(2)" 3
  saved backup bundle to $TESTTMP/test/.hg/strip-backup/*-backup.hg (glob)
  $ hg log -G
  @  changeset:   2:264128213d29
  |  tag:         tip
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     c
  |
  o  changeset:   1:ef3a871183d7
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     b
  |
  o  changeset:   0:9ab35a2d17cb
     user:        test
     date:        Thu Jan 01 00:00:00 1970 +0000
     summary:     a
  
  $ restore
  $ hg log -G
  o  changeset:   4:443431ffac4f
  |  tag:         tip
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     e
  |
  o  changeset:   3:65bd5f99a4a3
  |  parent:      1:ef3a871183d7
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     d
  |
  | @  changeset:   2:264128213d29
  |/   user:        test
  |    date:        Thu Jan 01 00:00:00 1970 +0000
  |    summary:     c
  |
  o  changeset:   1:ef3a871183d7
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     b
  |
  o  changeset:   0:9ab35a2d17cb
     user:        test
     date:        Thu Jan 01 00:00:00 1970 +0000
     summary:     a
  
Failed hook while applying "saveheads" bundle.

  $ hg strip 2 --config hooks.pretxnchangegroup.bad=false
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  saved backup bundle to $TESTTMP/test/.hg/strip-backup/*-backup.hg (glob)
  transaction abort!
  rollback completed
  strip failed, backup bundle stored in '$TESTTMP/test/.hg/strip-backup/*-backup.hg' (glob)
  strip failed, unrecovered changes stored in '$TESTTMP/test/.hg/strip-backup/*-temp.hg' (glob)
  (fix the problem, then recover the changesets with "hg unbundle '$TESTTMP/test/.hg/strip-backup/*-temp.hg'") (glob)
  abort: pretxnchangegroup.bad hook exited with status 1
  [255]
  $ restore
  $ hg log -G
  o  changeset:   4:443431ffac4f
  |  tag:         tip
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     e
  |
  o  changeset:   3:65bd5f99a4a3
  |  parent:      1:ef3a871183d7
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     d
  |
  | o  changeset:   2:264128213d29
  |/   user:        test
  |    date:        Thu Jan 01 00:00:00 1970 +0000
  |    summary:     c
  |
  @  changeset:   1:ef3a871183d7
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     b
  |
  o  changeset:   0:9ab35a2d17cb
     user:        test
     date:        Thu Jan 01 00:00:00 1970 +0000
     summary:     a
  

2 different branches: 2 strips

  $ hg strip 2 4
  saved backup bundle to $TESTTMP/test/.hg/strip-backup/*-backup.hg (glob)
  $ hg log -G
  o  changeset:   2:65bd5f99a4a3
  |  tag:         tip
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     d
  |
  @  changeset:   1:ef3a871183d7
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     b
  |
  o  changeset:   0:9ab35a2d17cb
     user:        test
     date:        Thu Jan 01 00:00:00 1970 +0000
     summary:     a
  
  $ restore

2 different branches and a common ancestor: 1 strip

  $ hg strip 1 "2|4"
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  saved backup bundle to $TESTTMP/test/.hg/strip-backup/*-backup.hg (glob)
  $ restore

verify fncache is kept up-to-date

  $ touch a
  $ hg ci -qAm a
#if repofncache
  $ cat .hg/store/fncache | sort
  data/a.i
  data/bar.i
#endif

  $ hg strip tip
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  saved backup bundle to $TESTTMP/test/.hg/strip-backup/*-backup.hg (glob)
#if repofncache
  $ cat .hg/store/fncache
  data/bar.i
#endif

stripping an empty revset

  $ hg strip "1 and not 1"
  abort: empty revision set
  [255]

remove branchy history for qimport tests

  $ hg strip 3
  saved backup bundle to $TESTTMP/test/.hg/strip-backup/*-backup.hg (glob)


strip of applied mq should cleanup status file

  $ echo "mq=" >> $HGRCPATH
  $ hg up -C 3
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ echo fooagain >> bar
  $ hg ci -mf
  $ hg qimport -r tip:2

applied patches before strip

  $ hg qapplied
  d
  e
  f

stripping revision in queue

  $ hg strip 3
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  saved backup bundle to $TESTTMP/test/.hg/strip-backup/*-backup.hg (glob)

applied patches after stripping rev in queue

  $ hg qapplied
  d

stripping ancestor of queue

  $ hg strip 1
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  saved backup bundle to $TESTTMP/test/.hg/strip-backup/*-backup.hg (glob)

applied patches after stripping ancestor of queue

  $ hg qapplied

Verify strip protects against stripping wc parent when there are uncommitted mods

  $ echo b > b
  $ echo bb > bar
  $ hg add b
  $ hg ci -m 'b'
  $ hg log --graph
  @  changeset:   1:76dcf9fab855
  |  tag:         tip
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     b
  |
  o  changeset:   0:9ab35a2d17cb
     user:        test
     date:        Thu Jan 01 00:00:00 1970 +0000
     summary:     a
  
  $ hg up 0
  1 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ echo c > bar
  $ hg up -t false
  merging bar
  merging bar failed!
  1 files updated, 0 files merged, 0 files removed, 1 files unresolved
  use 'hg resolve' to retry unresolved file merges
  [1]
  $ hg sum
  parent: 1:76dcf9fab855 tip
   b
  branch: default
  commit: 1 modified, 1 unknown, 1 unresolved
  update: (current)
  phases: 2 draft
  mq:     3 unapplied

  $ echo c > b
  $ hg strip tip
  abort: local changes found
  [255]
  $ hg strip tip --keep
  saved backup bundle to $TESTTMP/test/.hg/strip-backup/*-backup.hg (glob)
  $ hg log --graph
  @  changeset:   0:9ab35a2d17cb
     tag:         tip
     user:        test
     date:        Thu Jan 01 00:00:00 1970 +0000
     summary:     a
  
  $ hg status
  M bar
  ? b
  ? bar.orig

  $ rm bar.orig
  $ hg sum
  parent: 0:9ab35a2d17cb tip
   a
  branch: default
  commit: 1 modified, 1 unknown
  update: (current)
  phases: 1 draft
  mq:     3 unapplied

Strip adds, removes, modifies with --keep

  $ touch b
  $ hg add b
  $ hg commit -mb
  $ touch c

... with a clean working dir

  $ hg add c
  $ hg rm bar
  $ hg commit -mc
  $ hg status
  $ hg strip --keep tip
  saved backup bundle to $TESTTMP/test/.hg/strip-backup/*-backup.hg (glob)
  $ hg status
  ! bar
  ? c

... with a dirty working dir

  $ hg add c
  $ hg rm bar
  $ hg commit -mc
  $ hg status
  $ echo b > b
  $ echo d > d
  $ hg strip --keep tip
  saved backup bundle to $TESTTMP/test/.hg/strip-backup/*-backup.hg (glob)
  $ hg status
  M b
  ! bar
  ? c
  ? d

... after updating the dirstate
  $ hg add c
  $ hg commit -mc
  $ hg rm c
  $ hg commit -mc
  $ hg strip --keep '.^' -q
  $ cd ..

stripping many nodes on a complex graph (issue3299)

  $ hg init issue3299
  $ cd issue3299
  $ hg debugbuilddag '@a.:a@b.:b.:x<a@a.:a<b@b.:b<a@a.:a'
  $ hg strip 'not ancestors(x)'
  saved backup bundle to $TESTTMP/issue3299/.hg/strip-backup/*-backup.hg (glob)

test hg strip -B bookmark

  $ cd ..
  $ hg init bookmarks
  $ cd bookmarks
  $ hg debugbuilddag '..<2.*1/2:m<2+3:c<m+3:a<2.:b<m+2:d<2.:e<m+1:f'
  $ hg bookmark -r 'a' 'todelete'
  $ hg bookmark -r 'b' 'B'
  $ hg bookmark -r 'b' 'nostrip'
  $ hg bookmark -r 'c' 'delete'
  $ hg bookmark -r 'd' 'multipledelete1'
  $ hg bookmark -r 'e' 'multipledelete2'
  $ hg bookmark -r 'f' 'singlenode1'
  $ hg bookmark -r 'f' 'singlenode2'
  $ hg up -C todelete
  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
  (activating bookmark todelete)
  $ hg strip -B nostrip
  bookmark 'nostrip' deleted
  abort: empty revision set
  [255]
  $ hg strip -B todelete
  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
  saved backup bundle to $TESTTMP/bookmarks/.hg/strip-backup/*-backup.hg (glob)
  bookmark 'todelete' deleted
  $ hg id -ir dcbb326fdec2
  abort: unknown revision 'dcbb326fdec2'!
  [255]
  $ hg id -ir d62d843c9a01
  d62d843c9a01
  $ hg bookmarks
     B                         9:ff43616e5d0f
     delete                    6:2702dd0c91e7
     multipledelete1           11:e46a4836065c
     multipledelete2           12:b4594d867745
     singlenode1               13:43227190fef8
     singlenode2               13:43227190fef8
  $ hg strip -B multipledelete1 -B multipledelete2
  saved backup bundle to $TESTTMP/bookmarks/.hg/strip-backup/e46a4836065c-89ec65c2-backup.hg
  bookmark 'multipledelete1' deleted
  bookmark 'multipledelete2' deleted
  $ hg id -ir e46a4836065c
  abort: unknown revision 'e46a4836065c'!
  [255]
  $ hg id -ir b4594d867745
  abort: unknown revision 'b4594d867745'!
  [255]
  $ hg strip -B singlenode1 -B singlenode2
  saved backup bundle to $TESTTMP/bookmarks/.hg/strip-backup/43227190fef8-8da858f2-backup.hg
  bookmark 'singlenode1' deleted
  bookmark 'singlenode2' deleted
  $ hg id -ir 43227190fef8
  abort: unknown revision '43227190fef8'!
  [255]
  $ hg strip -B unknownbookmark
  abort: bookmark 'unknownbookmark' not found
  [255]
  $ hg strip -B unknownbookmark1 -B unknownbookmark2
  abort: bookmark 'unknownbookmark1,unknownbookmark2' not found
  [255]
  $ hg strip -B delete -B unknownbookmark
  abort: bookmark 'unknownbookmark' not found
  [255]
  $ hg strip -B delete
  saved backup bundle to $TESTTMP/bookmarks/.hg/strip-backup/*-backup.hg (glob)
  bookmark 'delete' deleted
  $ hg id -ir 6:2702dd0c91e7
  abort: unknown revision '2702dd0c91e7'!
  [255]
  $ hg update B
  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
  (activating bookmark B)
  $ echo a > a
  $ hg add a
  $ hg strip -B B
  abort: local changes found
  [255]
  $ hg bookmarks
   * B                         6:ff43616e5d0f

Make sure no one adds back a -b option:

  $ hg strip -b tip
  hg strip: option -b not recognized
  hg strip [-k] [-f] [-B bookmark] [-r] REV...
  
  strip changesets and all their descendants from the repository
  
  (use 'hg help -e strip' to show help for the strip extension)
  
  options ([+] can be repeated):
  
   -r --rev REV [+]        strip specified revision (optional, can specify
                           revisions without this option)
   -f --force              force removal of changesets, discard uncommitted
                           changes (no backup)
      --no-backup          do not save backup bundle
   -k --keep               do not modify working directory during strip
   -B --bookmark VALUE [+] remove revs only reachable from given bookmark
      --mq                 operate on patch repository
  
  (use 'hg strip -h' to show more help)
  [255]

  $ cd ..

Verify bundles don't get overwritten:

  $ hg init doublebundle
  $ cd doublebundle
  $ touch a
  $ hg commit -Aqm a
  $ touch b
  $ hg commit -Aqm b
  $ hg strip -r 0
  0 files updated, 0 files merged, 2 files removed, 0 files unresolved
  saved backup bundle to $TESTTMP/doublebundle/.hg/strip-backup/3903775176ed-e68910bd-backup.hg
  $ ls .hg/strip-backup
  3903775176ed-e68910bd-backup.hg
#if repobundlerepo
  $ hg pull -q -r 3903775176ed .hg/strip-backup/3903775176ed-e68910bd-backup.hg
  $ hg strip -r 0
  saved backup bundle to $TESTTMP/doublebundle/.hg/strip-backup/3903775176ed-54390173-backup.hg
  $ ls .hg/strip-backup
  3903775176ed-54390173-backup.hg
  3903775176ed-e68910bd-backup.hg
#endif
  $ cd ..

Test that we only bundle the stripped changesets (issue4736)
------------------------------------------------------------

initialization (previous repo is empty anyway)

  $ hg init issue4736
  $ cd issue4736
  $ echo a > a
  $ hg add a
  $ hg commit -m commitA
  $ echo b > b
  $ hg add b
  $ hg commit -m commitB
  $ echo c > c
  $ hg add c
  $ hg commit -m commitC
  $ hg up 'desc(commitB)'
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ echo d > d
  $ hg add d
  $ hg commit -m commitD
  created new head
  $ hg up 'desc(commitC)'
  1 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ hg merge 'desc(commitD)'
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  (branch merge, don't forget to commit)
  $ hg ci -m 'mergeCD'
  $ hg log -G
  @    changeset:   4:d8db9d137221
  |\   tag:         tip
  | |  parent:      2:5c51d8d6557d
  | |  parent:      3:6625a5168474
  | |  user:        test
  | |  date:        Thu Jan 01 00:00:00 1970 +0000
  | |  summary:     mergeCD
  | |
  | o  changeset:   3:6625a5168474
  | |  parent:      1:eca11cf91c71
  | |  user:        test
  | |  date:        Thu Jan 01 00:00:00 1970 +0000
  | |  summary:     commitD
  | |
  o |  changeset:   2:5c51d8d6557d
  |/   user:        test
  |    date:        Thu Jan 01 00:00:00 1970 +0000
  |    summary:     commitC
  |
  o  changeset:   1:eca11cf91c71
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     commitB
  |
  o  changeset:   0:105141ef12d0
     user:        test
     date:        Thu Jan 01 00:00:00 1970 +0000
     summary:     commitA
  

Check bundle behavior:

  $ hg bundle -r 'desc(mergeCD)' --base 'desc(commitC)' ../issue4736.hg
  2 changesets found
#if repobundlerepo
  $ hg log -r 'bundle()' -R ../issue4736.hg
  changeset:   3:6625a5168474
  parent:      1:eca11cf91c71
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     commitD
  
  changeset:   4:d8db9d137221
  tag:         tip
  parent:      2:5c51d8d6557d
  parent:      3:6625a5168474
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     mergeCD
  
#endif

check strip behavior

  $ hg --config extensions.strip= strip 'desc(commitD)' --debug
  resolving manifests
   branchmerge: False, force: True, partial: False
   ancestor: d8db9d137221+, local: d8db9d137221+, remote: eca11cf91c71
   c: other deleted -> r
  removing c
   d: other deleted -> r
  removing d
  starting 4 threads for background file closing (?)
  0 files updated, 0 files merged, 2 files removed, 0 files unresolved
  2 changesets found
  list of changesets:
  6625a516847449b6f0fa3737b9ba56e9f0f3032c
  d8db9d1372214336d2b5570f20ee468d2c72fa8b
  bundle2-output-bundle: "HG20", (1 params) 3 parts total
  bundle2-output-part: "changegroup" (params: 1 mandatory 1 advisory) streamed payload
  bundle2-output-part: "cache:rev-branch-cache" (advisory) streamed payload
  bundle2-output-part: "phase-heads" 24 bytes payload
  saved backup bundle to $TESTTMP/issue4736/.hg/strip-backup/6625a5168474-345bb43d-backup.hg
  updating the branch cache
  invalid branchheads cache (served): tip differs
  $ hg log -G
  o  changeset:   2:5c51d8d6557d
  |  tag:         tip
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     commitC
  |
  @  changeset:   1:eca11cf91c71
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     commitB
  |
  o  changeset:   0:105141ef12d0
     user:        test
     date:        Thu Jan 01 00:00:00 1970 +0000
     summary:     commitA
  

strip backup content

#if repobundlerepo
  $ hg log -r 'bundle()' -R .hg/strip-backup/6625a5168474-*-backup.hg
  changeset:   3:6625a5168474
  parent:      1:eca11cf91c71
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     commitD
  
  changeset:   4:d8db9d137221
  tag:         tip
  parent:      2:5c51d8d6557d
  parent:      3:6625a5168474
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     mergeCD
  

#endif

Check that the phase cache is properly invalidated after a strip with bookmark.

  $ cat > ../stripstalephasecache.py << EOF
  > from mercurial import extensions, localrepo
  > def transactioncallback(orig, repo, desc, *args, **kwargs):
  >     def test(transaction):
  >         # observe cache inconsistency
  >         try:
  >             [repo.changelog.node(r) for r in repo.revs(b"not public()")]
  >         except IndexError:
  >             repo.ui.status(b"Index error!\n")
  >     transaction = orig(repo, desc, *args, **kwargs)
  >     # warm up the phase cache
  >     list(repo.revs(b"not public()"))
  >     if desc != b'strip':
  >          transaction.addpostclose(b"phase invalidation test", test)
  >     return transaction
  > def extsetup(ui):
  >     extensions.wrapfunction(localrepo.localrepository, b"transaction",
  >                             transactioncallback)
  > EOF
  $ hg up -C 2
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ echo k > k
  $ hg add k
  $ hg commit -m commitK
  $ echo l > l
  $ hg add l
  $ hg commit -m commitL
  $ hg book -r tip blah
  $ hg strip ".^" --config extensions.crash=$TESTTMP/stripstalephasecache.py
  0 files updated, 0 files merged, 2 files removed, 0 files unresolved
  saved backup bundle to $TESTTMP/issue4736/.hg/strip-backup/8f0b4384875c-4fa10deb-backup.hg
  $ hg up -C 1
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved

Error during post-close callback of the strip transaction
(They should be gracefully handled and reported)

  $ cat > ../crashstrip.py << EOF
  > from mercurial import error
  > def reposetup(ui, repo):
  >     class crashstriprepo(repo.__class__):
  >         def transaction(self, desc, *args, **kwargs):
  >             tr = super(crashstriprepo, self).transaction(desc, *args, **kwargs)
  >             if desc == b'strip':
  >                 def crash(tra): raise error.Abort(b'boom')
  >                 tr.addpostclose(b'crash', crash)
  >             return tr
  >     repo.__class__ = crashstriprepo
  > EOF
  $ hg strip tip --config extensions.crash=$TESTTMP/crashstrip.py
  saved backup bundle to $TESTTMP/issue4736/.hg/strip-backup/5c51d8d6557d-70daef06-backup.hg
  strip failed, backup bundle stored in '$TESTTMP/issue4736/.hg/strip-backup/5c51d8d6557d-70daef06-backup.hg'
  abort: boom
  [255]

test stripping a working directory parent doesn't switch named branches

  $ hg log -G
  @  changeset:   1:eca11cf91c71
  |  tag:         tip
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     commitB
  |
  o  changeset:   0:105141ef12d0
     user:        test
     date:        Thu Jan 01 00:00:00 1970 +0000
     summary:     commitA
  

  $ hg branch new-branch
  marked working directory as branch new-branch
  (branches are permanent and global, did you want a bookmark?)
  $ hg ci -m "start new branch"
  $ echo 'foo' > foo.txt
  $ hg ci -Aqm foo
  $ hg up default
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ echo 'bar' > bar.txt
  $ hg ci -Aqm bar
  $ hg up new-branch
  1 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ hg merge default
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  (branch merge, don't forget to commit)
  $ hg log -G
  @  changeset:   4:35358f982181
  |  tag:         tip
  |  parent:      1:eca11cf91c71
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     bar
  |
  | @  changeset:   3:f62c6c09b707
  | |  branch:      new-branch
  | |  user:        test
  | |  date:        Thu Jan 01 00:00:00 1970 +0000
  | |  summary:     foo
  | |
  | o  changeset:   2:b1d33a8cadd9
  |/   branch:      new-branch
  |    user:        test
  |    date:        Thu Jan 01 00:00:00 1970 +0000
  |    summary:     start new branch
  |
  o  changeset:   1:eca11cf91c71
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     commitB
  |
  o  changeset:   0:105141ef12d0
     user:        test
     date:        Thu Jan 01 00:00:00 1970 +0000
     summary:     commitA
  

  $ hg strip --force -r 35358f982181
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  saved backup bundle to $TESTTMP/issue4736/.hg/strip-backup/35358f982181-50d992d4-backup.hg
  $ hg log -G
  @  changeset:   3:f62c6c09b707
  |  branch:      new-branch
  |  tag:         tip
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     foo
  |
  o  changeset:   2:b1d33a8cadd9
  |  branch:      new-branch
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     start new branch
  |
  o  changeset:   1:eca11cf91c71
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     commitB
  |
  o  changeset:   0:105141ef12d0
     user:        test
     date:        Thu Jan 01 00:00:00 1970 +0000
     summary:     commitA
  

  $ hg up default
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ echo 'bar' > bar.txt
  $ hg ci -Aqm bar
  $ hg up new-branch
  1 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ hg merge default
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  (branch merge, don't forget to commit)
  $ hg ci -m merge
  $ hg log -G
  @    changeset:   5:4cf5e92caec2
  |\   branch:      new-branch
  | |  tag:         tip
  | |  parent:      3:f62c6c09b707
  | |  parent:      4:35358f982181
  | |  user:        test
  | |  date:        Thu Jan 01 00:00:00 1970 +0000
  | |  summary:     merge
  | |
  | o  changeset:   4:35358f982181
  | |  parent:      1:eca11cf91c71
  | |  user:        test
  | |  date:        Thu Jan 01 00:00:00 1970 +0000
  | |  summary:     bar
  | |
  o |  changeset:   3:f62c6c09b707
  | |  branch:      new-branch
  | |  user:        test
  | |  date:        Thu Jan 01 00:00:00 1970 +0000
  | |  summary:     foo
  | |
  o |  changeset:   2:b1d33a8cadd9
  |/   branch:      new-branch
  |    user:        test
  |    date:        Thu Jan 01 00:00:00 1970 +0000
  |    summary:     start new branch
  |
  o  changeset:   1:eca11cf91c71
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     commitB
  |
  o  changeset:   0:105141ef12d0
     user:        test
     date:        Thu Jan 01 00:00:00 1970 +0000
     summary:     commitA
  

  $ hg strip -r 35358f982181
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  saved backup bundle to $TESTTMP/issue4736/.hg/strip-backup/35358f982181-a6f020aa-backup.hg
  $ hg log -G
  @  changeset:   3:f62c6c09b707
  |  branch:      new-branch
  |  tag:         tip
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     foo
  |
  o  changeset:   2:b1d33a8cadd9
  |  branch:      new-branch
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     start new branch
  |
  o  changeset:   1:eca11cf91c71
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     commitB
  |
  o  changeset:   0:105141ef12d0
     user:        test
     date:        Thu Jan 01 00:00:00 1970 +0000
     summary:     commitA
  

  $ hg unbundle -u $TESTTMP/issue4736/.hg/strip-backup/35358f982181-a6f020aa-backup.hg
  adding changesets
  adding manifests
  adding file changes
  added 2 changesets with 1 changes to 1 files
  new changesets 35358f982181:4cf5e92caec2 (2 drafts)
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved

  $ hg strip -k -r 35358f982181
  saved backup bundle to $TESTTMP/issue4736/.hg/strip-backup/35358f982181-a6f020aa-backup.hg
  $ hg log -G
  @  changeset:   3:f62c6c09b707
  |  branch:      new-branch
  |  tag:         tip
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     foo
  |
  o  changeset:   2:b1d33a8cadd9
  |  branch:      new-branch
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     start new branch
  |
  o  changeset:   1:eca11cf91c71
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     commitB
  |
  o  changeset:   0:105141ef12d0
     user:        test
     date:        Thu Jan 01 00:00:00 1970 +0000
     summary:     commitA
  
  $ hg diff
  diff -r f62c6c09b707 bar.txt
  --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
  +++ b/bar.txt	Thu Jan 01 00:00:00 1970 +0000
  @@ -0,0 +1,1 @@
  +bar

Use delayedstrip to strip inside a transaction

  $ cd $TESTTMP
  $ hg init delayedstrip
  $ cd delayedstrip
  $ hg debugdrawdag <<'EOS'
  >   D
  >   |
  >   C F H    # Commit on top of "I",
  >   | |/|    # Strip B+D+I+E+G+H+Z
  > I B E G
  >  \|/
  >   A   Z
  > EOS
  $ cp -R . ../scmutilcleanup

  $ hg up -C I
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ echo 3 >> I
  $ cat > $TESTTMP/delayedstrip.py <<EOF
  > from __future__ import absolute_import
  > from mercurial import commands, registrar, repair
  > cmdtable = {}
  > command = registrar.command(cmdtable)
  > @command(b'testdelayedstrip')
  > def testdelayedstrip(ui, repo):
  >     def getnodes(expr):
  >         return [repo.changelog.node(r) for r in repo.revs(expr)]
  >     with repo.wlock():
  >         with repo.lock():
  >             with repo.transaction(b'delayedstrip'):
  >                 repair.delayedstrip(ui, repo, getnodes(b'B+I+Z+D+E'), b'J')
  >                 repair.delayedstrip(ui, repo, getnodes(b'G+H+Z'), b'I')
  >                 commands.commit(ui, repo, message=b'J', date=b'0 0')
  > EOF
  $ hg testdelayedstrip --config extensions.t=$TESTTMP/delayedstrip.py
  warning: orphaned descendants detected, not stripping 08ebfeb61bac, 112478962961, 7fb047a69f22
  saved backup bundle to $TESTTMP/delayedstrip/.hg/strip-backup/f585351a92f8-17475721-I.hg

  $ hg log -G -T '{rev}:{node|short} {desc}' -r 'sort(all(), topo)'
  @  6:2f2d51af6205 J
  |
  o  3:08ebfeb61bac I
  |
  | o  5:64a8289d2492 F
  | |
  | o  2:7fb047a69f22 E
  |/
  | o  4:26805aba1e60 C
  | |
  | o  1:112478962961 B
  |/
  o  0:426bada5c675 A
  
Test high-level scmutil.cleanupnodes API

  $ cd $TESTTMP/scmutilcleanup
  $ hg debugdrawdag <<'EOS'
  >   D2  F2  G2   # D2, F2, G2 are replacements for D, F, G
  >   |   |   |
  >   C   H   G
  > EOS
  $ for i in B C D F G I Z; do
  >     hg bookmark -i -r $i b-$i
  > done
  $ hg bookmark -i -r E 'b-F@divergent1'
  $ hg bookmark -i -r H 'b-F@divergent2'
  $ hg bookmark -i -r G 'b-F@divergent3'
  $ cp -R . ../scmutilcleanup.obsstore

  $ cat > $TESTTMP/scmutilcleanup.py <<EOF
  > from mercurial import registrar, scmutil
  > cmdtable = {}
  > command = registrar.command(cmdtable)
  > @command(b'testnodescleanup')
  > def testnodescleanup(ui, repo):
  >     def nodes(expr):
  >         return [repo.changelog.node(r) for r in repo.revs(expr)]
  >     def node(expr):
  >         return nodes(expr)[0]
  >     with repo.wlock():
  >         with repo.lock():
  >             with repo.transaction(b'delayedstrip'):
  >                 mapping = {node(b'F'): [node(b'F2')],
  >                            node(b'D'): [node(b'D2')],
  >                            node(b'G'): [node(b'G2')]}
  >                 scmutil.cleanupnodes(repo, mapping, b'replace')
  >                 scmutil.cleanupnodes(repo, nodes(b'((B::)+I+Z)-D2-obsolete()'),
  >                                      b'replace')
  > EOF
  $ hg testnodescleanup --config extensions.t=$TESTTMP/scmutilcleanup.py
  warning: orphaned descendants detected, not stripping 112478962961, 1fc8102cda62, 26805aba1e60
  saved backup bundle to $TESTTMP/scmutilcleanup/.hg/strip-backup/f585351a92f8-73fb7c03-replace.hg

  $ hg log -G -T '{rev}:{node|short} {desc} {bookmarks}' -r 'sort(all(), topo)'
  o  8:1473d4b996d1 G2 b-F@divergent3 b-G
  |
  | o  7:d11b3456a873 F2 b-F
  | |
  | o  5:5cb05ba470a7 H
  |/|
  | o  3:7fb047a69f22 E b-F@divergent1
  | |
  | | o  6:7c78f703e465 D2 b-D
  | | |
  | | o  4:26805aba1e60 C
  | | |
  | | o  2:112478962961 B
  | |/
  o |  1:1fc8102cda62 G
   /
  o  0:426bada5c675 A b-B b-C b-I
  
  $ hg bookmark
     b-B                       0:426bada5c675
     b-C                       0:426bada5c675
     b-D                       6:7c78f703e465
     b-F                       7:d11b3456a873
     b-F@divergent1            3:7fb047a69f22
     b-F@divergent3            8:1473d4b996d1
     b-G                       8:1473d4b996d1
     b-I                       0:426bada5c675
     b-Z                       -1:000000000000

Test the above using obsstore "by the way". Not directly related to strip, but
we have reusable code here

  $ cd $TESTTMP/scmutilcleanup.obsstore
  $ cat >> .hg/hgrc <<EOF
  > [experimental]
  > evolution=true
  > evolution.track-operation=1
  > EOF

  $ hg testnodescleanup --config extensions.t=$TESTTMP/scmutilcleanup.py
  4 new orphan changesets

  $ rm .hg/localtags
  $ hg log -G -T '{rev}:{node|short} {desc} {bookmarks}' -r 'sort(all(), topo)'
  *  12:1473d4b996d1 G2 b-F@divergent3 b-G
  |
  | *  11:d11b3456a873 F2 b-F
  | |
  | *  8:5cb05ba470a7 H
  |/|
  | o  4:7fb047a69f22 E b-F@divergent1
  | |
  | | *  10:7c78f703e465 D2 b-D
  | | |
  | | x  6:26805aba1e60 C
  | | |
  | | x  3:112478962961 B
  | |/
  x |  1:1fc8102cda62 G
   /
  o  0:426bada5c675 A b-B b-C b-I
  
  $ hg debugobsolete
  1fc8102cda6204549f031015641606ccf5513ec3 1473d4b996d1d1b121de6b39fab6a04fbf9d873e 0 (Thu Jan 01 00:00:00 1970 +0000) {'ef1': '13', 'operation': 'replace', 'user': 'test'}
  64a8289d249234b9886244d379f15e6b650b28e3 d11b3456a873daec7c7bc53e5622e8df6d741bd2 0 (Thu Jan 01 00:00:00 1970 +0000) {'ef1': '13', 'operation': 'replace', 'user': 'test'}
  f585351a92f85104bff7c284233c338b10eb1df7 7c78f703e465d73102cc8780667ce269c5208a40 0 (Thu Jan 01 00:00:00 1970 +0000) {'ef1': '9', 'operation': 'replace', 'user': 'test'}
  48b9aae0607f43ff110d84e6883c151942add5ab 0 {0000000000000000000000000000000000000000} (Thu Jan 01 00:00:00 1970 +0000) {'ef1': '0', 'operation': 'replace', 'user': 'test'}
  112478962961147124edd43549aedd1a335e44bf 0 {426bada5c67598ca65036d57d9e4b64b0c1ce7a0} (Thu Jan 01 00:00:00 1970 +0000) {'ef1': '0', 'operation': 'replace', 'user': 'test'}
  08ebfeb61bac6e3f12079de774d285a0d6689eba 0 {426bada5c67598ca65036d57d9e4b64b0c1ce7a0} (Thu Jan 01 00:00:00 1970 +0000) {'ef1': '0', 'operation': 'replace', 'user': 'test'}
  26805aba1e600a82e93661149f2313866a221a7b 0 {112478962961147124edd43549aedd1a335e44bf} (Thu Jan 01 00:00:00 1970 +0000) {'ef1': '0', 'operation': 'replace', 'user': 'test'}
  $ cd ..

Test that obsmarkers are restored even when not using generaldelta

  $ hg --config format.usegeneraldelta=no init issue5678
  $ cd issue5678
  $ cat >> .hg/hgrc <<EOF
  > [experimental]
  > evolution=true
  > EOF
  $ echo a > a
  $ hg ci -Aqm a
  $ hg ci --amend -m a2
  $ hg debugobsolete
  cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b 489bac576828490c0bb8d45eac9e5e172e4ec0a8 0 (Thu Jan 01 00:00:00 1970 +0000) {'ef1': '1', 'operation': 'amend', 'user': 'test'}
  $ hg strip .
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  saved backup bundle to $TESTTMP/issue5678/.hg/strip-backup/489bac576828-bef27e14-backup.hg
  $ hg unbundle -q .hg/strip-backup/*
  $ hg debugobsolete
  cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b 489bac576828490c0bb8d45eac9e5e172e4ec0a8 0 (Thu Jan 01 00:00:00 1970 +0000) {'ef1': '1', 'operation': 'amend', 'user': 'test'}
  $ cd ..