view tests/test-rebase-scenario-global.t @ 35569:964212780daf

rust: implementation of `hg`

This commit provides a mostly-working implementation of the
`hg` script in Rust along with scaffolding to support Rust in
the repository.

If you are familiar with Rust, the contents of the added rust/
directory should be pretty straightforward. We create an "hgcli"
package that implements a binary application to run Mercurial.
The output of this package is an "hg" binary.

Our Rust `hg` (henceforth "rhg") essentially is a port of the existing
`hg` Python script. The main difference is the creation of the embedded
CPython interpreter is handled by the binary itself instead of relying
on the shebang. In that sense, rhg is more similar to the "exe wrapper"
we currently use on Windows. However, unlike the exe wrapper, rhg does
not call the `hg` Python script. Instead, it uses the CPython APIs to
import mercurial modules and call appropriate functions. The amount of
code here is surprisingly small.

It is my intent to replace the existing C-based exe wrapper with rhg.
Preferably in the next Mercurial release. This should be achievable -
at least for some Mercurial distributions. The future/timeline for
rhg on other platforms is less clear. We already ship a hg.exe on
Windows. So if we get the quirks with Rust worked out, shipping a
Rust-based hg.exe should hopefully not be too contentious.

Now onto the implementation.

We're using python27-sys and the cpython crates for talking to the
CPython API. We currently don't use too much functionality of the
cpython crate and could have probably cut it out. However, it does
provide a reasonable abstraction over unsafe {} CPython function
calls. While we still have our fair share of those, at least we're
not dealing with too much refcounting, error checking, etc. So I
think the use of the cpython crate is justified. Plus, there is
not-yet-implemented functionality that could benefit from cpython. I
see our use of this crate only increasing.

The cpython and python27-sys crates are not without their issues.
The cpython crate didn't seem to account for the embedding use case
in its design. Instead, it seems to assume that you are building
a Python extension. It is making some questionable decisions around
certain CPython APIs. For example, it insists that
PyEval_ThreadsInitialized() is called and that the Python code
likely isn't the main thread in the underlying application. It
is also missing some functionality that is important for embedded
use cases (such as exporting the path to the Python interpreter
from its build script). After spending several hours trying to
wrangle python27-sys and cpython, I gave up and forked the project
on GitHub. Our Cargo.toml tracks this fork. I'm optimistic that
the upstream project will accept our contributions and we can
eventually unfork.

There is a non-trivial amount of code in our custom Cargo build
script. Our build.rs (which is called as part of building the hgcli
crate):

* Validates that the Python interpreter that was detected by the
  python27-sys crate provides a shared library (we only support
  shared library linking at this time - although this restriction
  could be loosened).
* Validates that the Python is built with UCS-4 support. This ensures
  maximum Unicode compatibility.
* Exports variables to the crate build allowing the built crate to e.g.
  find the path to the Python interpreter.

The produced rhg should be considered alpha quality. There are several
known deficiencies. Many of these are documented with inline TODOs.

Probably the biggest limitation of rhg is that it assumes it is
running from the ./rust/target/<target> directory of a source
distribution. So, rhg is currently not very practical for real-world
use. But, if you can `cargo build` it, running the binary *should*
yield a working Mercurial CLI.

In order to support using rhg with the test harness, we needed to hack
up run-tests.py so the path to Mercurial's Python files is set properly.
The change is extremely hacky and is only intended to be a stop-gap
until the test harness gains first-class support for installing rhg.
This will likely occur after we support running rhg outside the
source directory.

Despite its officially alpha quality, rhg copes extremely well with
the test harness (at least on Linux). Using
`run-tests.py --with-hg ../rust/target/debug/hg`, I only encounter
the following failures:

* test-run-tests.t -- Warnings emitted about using an unexpected
  Mercurial library. This is due to the hacky nature of setting the
  Python directory when run-tests.py detected rhg.
* test-devel-warnings.t -- Expected stack trace missing frame for `hg`
  (This is expected since we no longer have an `hg` script!)
* test-convert.t -- Test running `$PYTHON "$BINDIR"/hg`, which obviously
  assumes `hg` is a Python script.
* test-merge-tools.t -- Same assumption about `hg` being executable with
  Python.
* test-http-bad-server.t -- Seeing exit code 255 instead of 1 around
  line 358.
* test-blackbox.t -- Exit code 255 instead of 1.
* test-basic.t -- Exit code 255 instead of 1.

It certainly looks like we have a bug around exit code handling. I
don't think it is severe enough to hold up review and landing of this
initial implementation. Perfect is the enemy of good.

Differential Revision: https://phab.mercurial-scm.org/D1581

  $ 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
  (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 <[e-mail]>
  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
  (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('wrappedrebase'):
  >                 return orig(ui, repo, *args, **kwargs)
  > def wraprebase(loaded):
  >     assert loaded
  >     rebasemod = extensions.find('rebase')
  >     extensions.wrapcommand(rebasemod.cmdtable, 'rebase', _rebase)
  > def extsetup(ui):
  >     extensions.afterloaded('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]