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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
author Gregory Szorc <gregory.szorc@gmail.com>
date Tue, 09 Oct 2018 08:50:13 -0700
parents 89630d0b3e23
children 09680349cc2d
line wrap: on
line source

  $ cat >> $HGRCPATH <<EOF
  > [extensions]
  > rebase=
  > drawdag=$TESTDIR/drawdag.py
  > 
  > [phases]
  > publish=False
  > 
  > [alias]
  > tglog = log -G --template "{rev}: {node|short} '{desc}' {branches}\n"
  > EOF


  $ hg init a
  $ cd a
  $ hg unbundle "$TESTDIR/bundles/rebase.hg"
  adding changesets
  adding manifests
  adding file changes
  added 8 changesets with 7 changes to 7 files (+2 heads)
  new changesets cd010b8cd998:02de42196ebe (8 drafts)
  (run 'hg heads' to see heads, 'hg merge' to merge)
  $ hg up tip
  3 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ cd ..


Rebasing
D onto H - simple rebase:
(this also tests that editor is invoked if '--edit' is specified, and that we
can abort or warn for colliding untracked files)

  $ hg clone -q -u . a a1
  $ cd a1

  $ hg tglog
  @  7: 02de42196ebe 'H'
  |
  | o  6: eea13746799a 'G'
  |/|
  o |  5: 24b6387c8c8c 'F'
  | |
  | o  4: 9520eea781bc 'E'
  |/
  | o  3: 32af7686d403 'D'
  | |
  | o  2: 5fddd98957c8 'C'
  | |
  | o  1: 42ccdea3bb16 'B'
  |/
  o  0: cd010b8cd998 'A'
  

  $ hg status --rev "3^1" --rev 3
  A D
  $ echo collide > D
  $ HGEDITOR=cat hg rebase -s 3 -d 7 --edit --config merge.checkunknown=warn
  rebasing 3:32af7686d403 "D"
  D: replacing untracked file
  D
  
  
  HG: Enter commit message.  Lines beginning with 'HG:' are removed.
  HG: Leave message empty to abort commit.
  HG: --
  HG: user: Nicolas Dumazet <nicdumz.commits@gmail.com>
  HG: branch 'default'
  HG: added D
  saved backup bundle to $TESTTMP/a1/.hg/strip-backup/32af7686d403-6f7dface-rebase.hg
  $ cat D.orig
  collide
  $ rm D.orig

  $ hg tglog
  o  7: 1619f02ff7dd 'D'
  |
  @  6: 02de42196ebe 'H'
  |
  | o  5: eea13746799a 'G'
  |/|
  o |  4: 24b6387c8c8c 'F'
  | |
  | o  3: 9520eea781bc 'E'
  |/
  | o  2: 5fddd98957c8 'C'
  | |
  | o  1: 42ccdea3bb16 'B'
  |/
  o  0: cd010b8cd998 'A'
  
  $ cd ..


D onto F - intermediate point:
(this also tests that editor is not invoked if '--edit' is not specified, and
that we can ignore for colliding untracked files)

  $ hg clone -q -u . a a2
  $ cd a2
  $ echo collide > D

  $ HGEDITOR=cat hg rebase -s 3 -d 5 --config merge.checkunknown=ignore
  rebasing 3:32af7686d403 "D"
  saved backup bundle to $TESTTMP/a2/.hg/strip-backup/32af7686d403-6f7dface-rebase.hg
  $ cat D.orig
  collide
  $ rm D.orig

  $ hg tglog
  o  7: 2107530e74ab 'D'
  |
  | @  6: 02de42196ebe 'H'
  |/
  | o  5: eea13746799a 'G'
  |/|
  o |  4: 24b6387c8c8c 'F'
  | |
  | o  3: 9520eea781bc 'E'
  |/
  | o  2: 5fddd98957c8 'C'
  | |
  | o  1: 42ccdea3bb16 'B'
  |/
  o  0: cd010b8cd998 'A'
  
  $ cd ..


E onto H - skip of G:
(this also tests that we can overwrite untracked files and don't create backups
if they have the same contents)

  $ hg clone -q -u . a a3
  $ cd a3
  $ hg cat -r 4 E | tee E
  E

  $ hg rebase -s 4 -d 7
  rebasing 4:9520eea781bc "E"
  rebasing 6:eea13746799a "G"
  note: rebase of 6:eea13746799a created no changes to commit
  saved backup bundle to $TESTTMP/a3/.hg/strip-backup/9520eea781bc-fcd8edd4-rebase.hg
  $ f E.orig
  E.orig: file not found

  $ hg tglog
  o  6: 9f8b8ec77260 'E'
  |
  @  5: 02de42196ebe 'H'
  |
  o  4: 24b6387c8c8c 'F'
  |
  | o  3: 32af7686d403 'D'
  | |
  | o  2: 5fddd98957c8 'C'
  | |
  | o  1: 42ccdea3bb16 'B'
  |/
  o  0: cd010b8cd998 'A'
  
  $ cd ..


F onto E - rebase of a branching point (skip G):

  $ hg clone -q -u . a a4
  $ cd a4

  $ hg rebase -s 5 -d 4
  rebasing 5:24b6387c8c8c "F"
  rebasing 6:eea13746799a "G"
  note: rebase of 6:eea13746799a created no changes to commit
  rebasing 7:02de42196ebe "H" (tip)
  saved backup bundle to $TESTTMP/a4/.hg/strip-backup/24b6387c8c8c-c3fe765d-rebase.hg

  $ hg tglog
  @  6: e9240aeaa6ad 'H'
  |
  o  5: 5d0ccadb6e3e 'F'
  |
  o  4: 9520eea781bc 'E'
  |
  | o  3: 32af7686d403 'D'
  | |
  | o  2: 5fddd98957c8 'C'
  | |
  | o  1: 42ccdea3bb16 'B'
  |/
  o  0: cd010b8cd998 'A'
  
  $ cd ..


G onto H - merged revision having a parent in ancestors of target:

  $ hg clone -q -u . a a5
  $ cd a5

  $ hg rebase -s 6 -d 7
  rebasing 6:eea13746799a "G"
  saved backup bundle to $TESTTMP/a5/.hg/strip-backup/eea13746799a-883828ed-rebase.hg

  $ hg tglog
  o    7: 397834907a90 'G'
  |\
  | @  6: 02de42196ebe 'H'
  | |
  | o  5: 24b6387c8c8c 'F'
  | |
  o |  4: 9520eea781bc 'E'
  |/
  | o  3: 32af7686d403 'D'
  | |
  | o  2: 5fddd98957c8 'C'
  | |
  | o  1: 42ccdea3bb16 'B'
  |/
  o  0: cd010b8cd998 'A'
  
  $ cd ..


F onto B - G maintains E as parent:

  $ hg clone -q -u . a a6
  $ cd a6

  $ hg rebase -s 5 -d 1
  rebasing 5:24b6387c8c8c "F"
  rebasing 6:eea13746799a "G"
  rebasing 7:02de42196ebe "H" (tip)
  saved backup bundle to $TESTTMP/a6/.hg/strip-backup/24b6387c8c8c-c3fe765d-rebase.hg

  $ hg tglog
  @  7: c87be72f9641 'H'
  |
  | o  6: 17badd73d4f1 'G'
  |/|
  o |  5: 74fb9ed646c4 'F'
  | |
  | o  4: 9520eea781bc 'E'
  | |
  | | o  3: 32af7686d403 'D'
  | | |
  +---o  2: 5fddd98957c8 'C'
  | |
  o |  1: 42ccdea3bb16 'B'
  |/
  o  0: cd010b8cd998 'A'
  
  $ cd ..


These will fail (using --source):

G onto F - rebase onto an ancestor:

  $ hg clone -q -u . a a7
  $ cd a7

  $ hg rebase -s 6 -d 5
  nothing to rebase
  [1]

F onto G - rebase onto a descendant:

  $ hg rebase -s 5 -d 6
  abort: source and destination form a cycle
  [255]

G onto B - merge revision with both parents not in ancestors of target:

  $ hg rebase -s 6 -d 1
  rebasing 6:eea13746799a "G"
  abort: cannot rebase 6:eea13746799a without moving at least one of its parents
  [255]
  $ hg rebase --abort
  rebase aborted

These will abort gracefully (using --base):

G onto G - rebase onto same changeset:

  $ hg rebase -b 6 -d 6
  nothing to rebase - eea13746799a is both "base" and destination
  [1]

G onto F - rebase onto an ancestor:

  $ hg rebase -b 6 -d 5
  nothing to rebase
  [1]

F onto G - rebase onto a descendant:

  $ hg rebase -b 5 -d 6
  nothing to rebase - "base" 24b6387c8c8c is already an ancestor of destination eea13746799a
  [1]

C onto A - rebase onto an ancestor:

  $ hg rebase -d 0 -s 2
  rebasing 2:5fddd98957c8 "C"
  rebasing 3:32af7686d403 "D"
  saved backup bundle to $TESTTMP/a7/.hg/strip-backup/5fddd98957c8-f9244fa1-rebase.hg
  $ hg tglog
  o  7: c9659aac0000 'D'
  |
  o  6: e1c4361dd923 'C'
  |
  | @  5: 02de42196ebe 'H'
  | |
  | | o  4: eea13746799a 'G'
  | |/|
  | o |  3: 24b6387c8c8c 'F'
  |/ /
  | o  2: 9520eea781bc 'E'
  |/
  | o  1: 42ccdea3bb16 'B'
  |/
  o  0: cd010b8cd998 'A'
  

Check rebasing public changeset

  $ hg pull --config phases.publish=True -q -r 6 . # update phase of 6
  $ hg rebase -d 0 -b 6
  nothing to rebase
  [1]
  $ hg rebase -d 5 -b 6
  abort: can't rebase public changeset e1c4361dd923
  (see 'hg help phases' for details)
  [255]
  $ hg rebase -d 5 -r '1 + (6::)'
  abort: can't rebase public changeset e1c4361dd923
  (see 'hg help phases' for details)
  [255]

  $ hg rebase -d 5 -b 6 --keep
  rebasing 6:e1c4361dd923 "C"
  rebasing 7:c9659aac0000 "D" (tip)

Check rebasing mutable changeset
Source phase greater or equal to destination phase: new changeset get the phase of source:
  $ hg id -n
  5
  $ hg rebase -s9 -d0
  rebasing 9:2b23e52411f4 "D" (tip)
  saved backup bundle to $TESTTMP/a7/.hg/strip-backup/2b23e52411f4-f942decf-rebase.hg
  $ hg id -n # check we updated back to parent
  5
  $ hg log --template "{phase}\n" -r 9
  draft
  $ hg rebase -s9 -d1
  rebasing 9:2cb10d0cfc6c "D" (tip)
  saved backup bundle to $TESTTMP/a7/.hg/strip-backup/2cb10d0cfc6c-ddb0f256-rebase.hg
  $ hg log --template "{phase}\n" -r 9
  draft
  $ hg phase --force --secret 9
  $ hg rebase -s9 -d0
  rebasing 9:c5b12b67163a "D" (tip)
  saved backup bundle to $TESTTMP/a7/.hg/strip-backup/c5b12b67163a-4e372053-rebase.hg
  $ hg log --template "{phase}\n" -r 9
  secret
  $ hg rebase -s9 -d1
  rebasing 9:2a0524f868ac "D" (tip)
  saved backup bundle to $TESTTMP/a7/.hg/strip-backup/2a0524f868ac-cefd8574-rebase.hg
  $ hg log --template "{phase}\n" -r 9
  secret
Source phase lower than destination phase: new changeset get the phase of destination:
  $ hg rebase -s8 -d9
  rebasing 8:6d4f22462821 "C"
  saved backup bundle to $TESTTMP/a7/.hg/strip-backup/6d4f22462821-3441f70b-rebase.hg
  $ hg log --template "{phase}\n" -r 'rev(9)'
  secret

  $ cd ..

Check that temporary bundle doesn't lose phase when not using generaldelta

  $ hg --config format.usegeneraldelta=no init issue5678
  $ cd issue5678
  $ grep generaldelta .hg/requires
  [1]
  $ echo a > a
  $ hg ci -Aqm a
  $ echo b > b
  $ hg ci -Aqm b
  $ hg co -q '.^'
  $ echo c > c
  $ hg ci -Aqm c
  $ hg phase --public
  $ hg log -G -T '{rev}:{node|shortest} {phase} {desc}\n'
  @  2:d36c public c
  |
  | o  1:d2ae draft b
  |/
  o  0:cb9a public a
  
  $ hg rebase -s 1 -d 2
  rebasing 1:d2ae7f538514 "b"
  saved backup bundle to $TESTTMP/issue5678/.hg/strip-backup/d2ae7f538514-2953539b-rebase.hg
  $ hg log -G -T '{rev}:{node|shortest} {phase} {desc}\n'
  o  2:c882 draft b
  |
  @  1:d36c public c
  |
  o  0:cb9a public a
  
  $ cd ..

Test for revset

We need a bit different graph
All destination are B

  $ hg init ah
  $ cd ah
  $ hg unbundle "$TESTDIR/bundles/rebase-revset.hg"
  adding changesets
  adding manifests
  adding file changes
  added 9 changesets with 9 changes to 9 files (+2 heads)
  new changesets 9ae2ed22e576:479ddb54a924 (9 drafts)
  (run 'hg heads' to see heads, 'hg merge' to merge)
  $ hg tglog
  o  8: 479ddb54a924 'I'
  |
  o  7: 72434a4e60b0 'H'
  |
  o  6: 3d8a618087a7 'G'
  |
  | o  5: 41bfcc75ed73 'F'
  | |
  | o  4: c01897464e7f 'E'
  |/
  o  3: ffd453c31098 'D'
  |
  o  2: c9e50f6cdc55 'C'
  |
  | o  1: 8fd0f7e49f53 'B'
  |/
  o  0: 9ae2ed22e576 'A'
  
  $ cd ..


Simple case with keep:

Source on have two descendant heads but ask for one

  $ hg clone -q -u . ah ah1
  $ cd ah1
  $ hg rebase -r '2::8' -d 1
  abort: can't remove original changesets with unrebased descendants
  (use --keep to keep original changesets)
  [255]
  $ hg rebase -r '2::8' -d 1 -k
  rebasing 2:c9e50f6cdc55 "C"
  rebasing 3:ffd453c31098 "D"
  rebasing 6:3d8a618087a7 "G"
  rebasing 7:72434a4e60b0 "H"
  rebasing 8:479ddb54a924 "I" (tip)
  $ hg tglog
  o  13: 9bf1d9358a90 'I'
  |
  o  12: 274623a778d4 'H'
  |
  o  11: ab8c8617c8e8 'G'
  |
  o  10: c8cbf59f70da 'D'
  |
  o  9: 563e4faab485 'C'
  |
  | o  8: 479ddb54a924 'I'
  | |
  | o  7: 72434a4e60b0 'H'
  | |
  | o  6: 3d8a618087a7 'G'
  | |
  | | o  5: 41bfcc75ed73 'F'
  | | |
  | | o  4: c01897464e7f 'E'
  | |/
  | o  3: ffd453c31098 'D'
  | |
  | o  2: c9e50f6cdc55 'C'
  | |
  o |  1: 8fd0f7e49f53 'B'
  |/
  o  0: 9ae2ed22e576 'A'
  

  $ cd ..

Base on have one descendant heads we ask for but common ancestor have two

  $ hg clone -q -u . ah ah2
  $ cd ah2
  $ hg rebase -r '3::8' -d 1
  abort: can't remove original changesets with unrebased descendants
  (use --keep to keep original changesets)
  [255]
  $ hg rebase -r '3::8' -d 1 --keep
  rebasing 3:ffd453c31098 "D"
  rebasing 6:3d8a618087a7 "G"
  rebasing 7:72434a4e60b0 "H"
  rebasing 8:479ddb54a924 "I" (tip)
  $ hg tglog
  o  12: 9d7da0053b1c 'I'
  |
  o  11: 8fbd00952cbc 'H'
  |
  o  10: 51d434a615ee 'G'
  |
  o  9: a9c125634b0b 'D'
  |
  | o  8: 479ddb54a924 'I'
  | |
  | o  7: 72434a4e60b0 'H'
  | |
  | o  6: 3d8a618087a7 'G'
  | |
  | | o  5: 41bfcc75ed73 'F'
  | | |
  | | o  4: c01897464e7f 'E'
  | |/
  | o  3: ffd453c31098 'D'
  | |
  | o  2: c9e50f6cdc55 'C'
  | |
  o |  1: 8fd0f7e49f53 'B'
  |/
  o  0: 9ae2ed22e576 'A'
  

  $ cd ..

rebase subset

  $ hg clone -q -u . ah ah3
  $ cd ah3
  $ hg rebase -r '3::7' -d 1
  abort: can't remove original changesets with unrebased descendants
  (use --keep to keep original changesets)
  [255]
  $ hg rebase -r '3::7' -d 1 --keep
  rebasing 3:ffd453c31098 "D"
  rebasing 6:3d8a618087a7 "G"
  rebasing 7:72434a4e60b0 "H"
  $ hg tglog
  o  11: 8fbd00952cbc 'H'
  |
  o  10: 51d434a615ee 'G'
  |
  o  9: a9c125634b0b 'D'
  |
  | o  8: 479ddb54a924 'I'
  | |
  | o  7: 72434a4e60b0 'H'
  | |
  | o  6: 3d8a618087a7 'G'
  | |
  | | o  5: 41bfcc75ed73 'F'
  | | |
  | | o  4: c01897464e7f 'E'
  | |/
  | o  3: ffd453c31098 'D'
  | |
  | o  2: c9e50f6cdc55 'C'
  | |
  o |  1: 8fd0f7e49f53 'B'
  |/
  o  0: 9ae2ed22e576 'A'
  

  $ cd ..

rebase subset with multiple head

  $ hg clone -q -u . ah ah4
  $ cd ah4
  $ hg rebase -r '3::(7+5)' -d 1
  abort: can't remove original changesets with unrebased descendants
  (use --keep to keep original changesets)
  [255]
  $ hg rebase -r '3::(7+5)' -d 1 --keep
  rebasing 3:ffd453c31098 "D"
  rebasing 4:c01897464e7f "E"
  rebasing 5:41bfcc75ed73 "F"
  rebasing 6:3d8a618087a7 "G"
  rebasing 7:72434a4e60b0 "H"
  $ hg tglog
  o  13: 8fbd00952cbc 'H'
  |
  o  12: 51d434a615ee 'G'
  |
  | o  11: df23d8bda0b7 'F'
  | |
  | o  10: 47b7889448ff 'E'
  |/
  o  9: a9c125634b0b 'D'
  |
  | o  8: 479ddb54a924 'I'
  | |
  | o  7: 72434a4e60b0 'H'
  | |
  | o  6: 3d8a618087a7 'G'
  | |
  | | o  5: 41bfcc75ed73 'F'
  | | |
  | | o  4: c01897464e7f 'E'
  | |/
  | o  3: ffd453c31098 'D'
  | |
  | o  2: c9e50f6cdc55 'C'
  | |
  o |  1: 8fd0f7e49f53 'B'
  |/
  o  0: 9ae2ed22e576 'A'
  

  $ cd ..

More advanced tests

rebase on ancestor with revset

  $ hg clone -q -u . ah ah5
  $ cd ah5
  $ hg rebase -r '6::' -d 2
  rebasing 6:3d8a618087a7 "G"
  rebasing 7:72434a4e60b0 "H"
  rebasing 8:479ddb54a924 "I" (tip)
  saved backup bundle to $TESTTMP/ah5/.hg/strip-backup/3d8a618087a7-b4f73f31-rebase.hg
  $ hg tglog
  o  8: fcb52e68a694 'I'
  |
  o  7: 77bd65cd7600 'H'
  |
  o  6: 12d0e738fb18 'G'
  |
  | o  5: 41bfcc75ed73 'F'
  | |
  | o  4: c01897464e7f 'E'
  | |
  | o  3: ffd453c31098 'D'
  |/
  o  2: c9e50f6cdc55 'C'
  |
  | o  1: 8fd0f7e49f53 'B'
  |/
  o  0: 9ae2ed22e576 'A'
  
  $ cd ..


rebase with multiple root.
We rebase E and G on B
We would expect heads are I, F if it was supported

  $ hg clone -q -u . ah ah6
  $ cd ah6
  $ hg rebase -r '(4+6)::' -d 1
  rebasing 4:c01897464e7f "E"
  rebasing 5:41bfcc75ed73 "F"
  rebasing 6:3d8a618087a7 "G"
  rebasing 7:72434a4e60b0 "H"
  rebasing 8:479ddb54a924 "I" (tip)
  saved backup bundle to $TESTTMP/ah6/.hg/strip-backup/3d8a618087a7-aae93a24-rebase.hg
  $ hg tglog
  o  8: 9136df9a87cf 'I'
  |
  o  7: 23e8f30da832 'H'
  |
  o  6: b0efe8534e8b 'G'
  |
  | o  5: 6eb5b496ab79 'F'
  | |
  | o  4: d15eade9b0b1 'E'
  |/
  | o  3: ffd453c31098 'D'
  | |
  | o  2: c9e50f6cdc55 'C'
  | |
  o |  1: 8fd0f7e49f53 'B'
  |/
  o  0: 9ae2ed22e576 'A'
  
  $ cd ..

More complex rebase with multiple roots
each root have a different common ancestor with the destination and this is a detach

(setup)

  $ hg clone -q -u . a a8
  $ cd a8
  $ echo I > I
  $ hg add I
  $ hg commit -m I
  $ hg up 4
  1 files updated, 0 files merged, 3 files removed, 0 files unresolved
  $ echo I > J
  $ hg add J
  $ hg commit -m J
  created new head
  $ echo I > K
  $ hg add K
  $ hg commit -m K
  $ hg tglog
  @  10: 23a4ace37988 'K'
  |
  o  9: 1301922eeb0c 'J'
  |
  | o  8: e7ec4e813ba6 'I'
  | |
  | o  7: 02de42196ebe 'H'
  | |
  +---o  6: eea13746799a 'G'
  | |/
  | o  5: 24b6387c8c8c 'F'
  | |
  o |  4: 9520eea781bc 'E'
  |/
  | o  3: 32af7686d403 'D'
  | |
  | o  2: 5fddd98957c8 'C'
  | |
  | o  1: 42ccdea3bb16 'B'
  |/
  o  0: cd010b8cd998 'A'
  
(actual test)

  $ hg rebase --dest 'desc(G)' --rev 'desc(K) + desc(I)'
  rebasing 8:e7ec4e813ba6 "I"
  rebasing 10:23a4ace37988 "K" (tip)
  saved backup bundle to $TESTTMP/a8/.hg/strip-backup/23a4ace37988-b06984b3-rebase.hg
  $ hg log --rev 'children(desc(G))'
  changeset:   9:adb617877056
  parent:      6:eea13746799a
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     I
  
  changeset:   10:882431a34a0e
  tag:         tip
  parent:      6:eea13746799a
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     K
  
  $ hg tglog
  @  10: 882431a34a0e 'K'
  |
  | o  9: adb617877056 'I'
  |/
  | o  8: 1301922eeb0c 'J'
  | |
  | | o  7: 02de42196ebe 'H'
  | | |
  o---+  6: eea13746799a 'G'
  |/ /
  | o  5: 24b6387c8c8c 'F'
  | |
  o |  4: 9520eea781bc 'E'
  |/
  | o  3: 32af7686d403 'D'
  | |
  | o  2: 5fddd98957c8 'C'
  | |
  | o  1: 42ccdea3bb16 'B'
  |/
  o  0: cd010b8cd998 'A'
  

Test that rebase is not confused by $CWD disappearing during rebase (issue4121)

  $ cd ..
  $ hg init cwd-vanish
  $ cd cwd-vanish
  $ touch initial-file
  $ hg add initial-file
  $ hg commit -m 'initial commit'
  $ touch dest-file
  $ hg add dest-file
  $ hg commit -m 'dest commit'
  $ hg up 0
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ touch other-file
  $ hg add other-file
  $ hg commit -m 'first source commit'
  created new head
  $ mkdir subdir
  $ cd subdir
  $ touch subfile
  $ hg add subfile
  $ hg commit -m 'second source with subdir'

  $ hg rebase -b . -d 1 --traceback
  rebasing 2:779a07b1b7a0 "first source commit"
  current directory was removed (rmcwd !)
  (consider changing to repo root: $TESTTMP/cwd-vanish) (rmcwd !)
  rebasing 3:a7d6f3a00bf3 "second source with subdir" (tip)
  saved backup bundle to $TESTTMP/cwd-vanish/.hg/strip-backup/779a07b1b7a0-853e0073-rebase.hg

Get back to the root of cwd-vanish. Note that even though `cd ..`
works on most systems, it does not work on FreeBSD 10, so we use an
absolute path to get back to the repository.
  $ cd $TESTTMP

Test that rebase is done in topo order (issue5370)

  $ hg init order
  $ cd order
  $ touch a && hg add a && hg ci -m A
  $ touch b && hg add b && hg ci -m B
  $ touch c && hg add c && hg ci -m C
  $ hg up 1
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ touch d && hg add d && hg ci -m D
  created new head
  $ hg up 2
  1 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ touch e && hg add e && hg ci -m E
  $ hg up 3
  1 files updated, 0 files merged, 2 files removed, 0 files unresolved
  $ touch f && hg add f && hg ci -m F
  $ hg up 0
  0 files updated, 0 files merged, 3 files removed, 0 files unresolved
  $ touch g && hg add g && hg ci -m G
  created new head

  $ hg tglog
  @  6: 124bb27b6f28 'G'
  |
  | o  5: 412b391de760 'F'
  | |
  | | o  4: 82ae8dc7a9b7 'E'
  | | |
  | o |  3: ab709c9f7171 'D'
  | | |
  | | o  2: d84f5cfaaf14 'C'
  | |/
  | o  1: 76035bbd54bd 'B'
  |/
  o  0: 216878401574 'A'
  

  $ hg rebase -s 1 -d 6
  rebasing 1:76035bbd54bd "B"
  rebasing 2:d84f5cfaaf14 "C"
  rebasing 4:82ae8dc7a9b7 "E"
  rebasing 3:ab709c9f7171 "D"
  rebasing 5:412b391de760 "F"
  saved backup bundle to $TESTTMP/order/.hg/strip-backup/76035bbd54bd-e341bc99-rebase.hg

  $ hg tglog
  o  6: 31884cfb735e 'F'
  |
  o  5: 6d89fa5b0909 'D'
  |
  | o  4: de64d97c697b 'E'
  | |
  | o  3: b18e4d2d0aa1 'C'
  |/
  o  2: 0983daf9ff6a 'B'
  |
  @  1: 124bb27b6f28 'G'
  |
  o  0: 216878401574 'A'
  

Test experimental revset
========================

  $ cd ../cwd-vanish

Make the repo a bit more interesting

  $ hg up 1
  0 files updated, 0 files merged, 2 files removed, 0 files unresolved
  $ echo aaa > aaa
  $ hg add aaa
  $ hg commit -m aaa
  created new head
  $ hg log -G
  @  changeset:   4:5f7bc9025ed2
  |  tag:         tip
  |  parent:      1:58d79cc1cf43
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     aaa
  |
  | o  changeset:   3:1910d5ff34ea
  | |  user:        test
  | |  date:        Thu Jan 01 00:00:00 1970 +0000
  | |  summary:     second source with subdir
  | |
  | o  changeset:   2:82901330b6ef
  |/   user:        test
  |    date:        Thu Jan 01 00:00:00 1970 +0000
  |    summary:     first source commit
  |
  o  changeset:   1:58d79cc1cf43
  |  user:        test
  |  date:        Thu Jan 01 00:00:00 1970 +0000
  |  summary:     dest commit
  |
  o  changeset:   0:e94b687f7da3
     user:        test
     date:        Thu Jan 01 00:00:00 1970 +0000
     summary:     initial commit
  

Testing from lower head

  $ hg up 3
  2 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ hg log -r '_destrebase()'
  changeset:   4:5f7bc9025ed2
  tag:         tip
  parent:      1:58d79cc1cf43
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     aaa
  

Testing from upper head

  $ hg log -r '_destrebase(4)'
  changeset:   3:1910d5ff34ea
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     second source with subdir
  
  $ hg up 4
  1 files updated, 0 files merged, 2 files removed, 0 files unresolved
  $ hg log -r '_destrebase()'
  changeset:   3:1910d5ff34ea
  user:        test
  date:        Thu Jan 01 00:00:00 1970 +0000
  summary:     second source with subdir
  
Testing rebase being called inside another transaction

  $ cd $TESTTMP
  $ hg init tr-state
  $ cd tr-state
  $ cat > $TESTTMP/wraprebase.py <<EOF
  > from __future__ import absolute_import
  > from mercurial import extensions
  > def _rebase(orig, ui, repo, *args, **kwargs):
  >     with repo.wlock():
  >         with repo.lock():
  >             with repo.transaction(b'wrappedrebase'):
  >                 return orig(ui, repo, *args, **kwargs)
  > def wraprebase(loaded):
  >     assert loaded
  >     rebasemod = extensions.find(b'rebase')
  >     extensions.wrapcommand(rebasemod.cmdtable, b'rebase', _rebase)
  > def extsetup(ui):
  >     extensions.afterloaded(b'rebase', wraprebase)
  > EOF

  $ cat >> .hg/hgrc <<EOF
  > [extensions]
  > wraprebase=$TESTTMP/wraprebase.py
  > [experimental]
  > evolution=true
  > EOF

  $ hg debugdrawdag <<'EOS'
  > B C
  > |/
  > A
  > EOS

  $ hg rebase -s C -d B
  rebasing 2:dc0947a82db8 "C" (C tip)

  $ [ -f .hg/rebasestate ] && echo 'WRONG: rebasestate should not exist'
  [1]