view tests/test-convert-filemap.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

  $ HGMERGE=true; export HGMERGE
  $ echo '[extensions]' >> $HGRCPATH
  $ echo 'convert =' >> $HGRCPATH
  $ glog()
  > {
  >     hg log -G --template '{rev} "{desc}" files: {files}\n' "$@"
  > }
  $ hg init source
  $ cd source
  $ echo foo > foo
  $ echo baz > baz
  $ mkdir -p dir/subdir
  $ echo dir/file >> dir/file
  $ echo dir/file2 >> dir/file2
  $ echo dir/file3 >> dir/file3 # to be corrupted in rev 0
  $ echo dir/subdir/file3 >> dir/subdir/file3
  $ echo dir/subdir/file4 >> dir/subdir/file4
  $ hg ci -d '0 0' -qAm '0: add foo baz dir/'
  $ echo bar > bar
  $ echo quux > quux
  $ echo dir/file4 >> dir/file4 # to be corrupted in rev 1
  $ hg copy foo copied
  $ hg ci -d '1 0' -qAm '1: add bar quux; copy foo to copied'
  $ echo >> foo
  $ hg ci -d '2 0' -m '2: change foo'
  $ hg up -qC 1
  $ echo >> bar
  $ echo >> quux
  $ hg ci -d '3 0' -m '3: change bar quux'
  created new head
  $ hg up -qC 2
  $ hg merge -qr 3
  $ echo >> bar
  $ echo >> baz
  $ hg ci -d '4 0' -m '4: first merge; change bar baz'
  $ echo >> bar
  $ echo 1 >> baz
  $ echo >> quux
  $ hg ci -d '5 0' -m '5: change bar baz quux'
  $ hg up -qC 4
  $ echo >> foo
  $ echo 2 >> baz
  $ hg ci -d '6 0' -m '6: change foo baz'
  created new head
  $ hg up -qC 5
  $ hg merge -qr 6
  $ echo >> bar
  $ hg ci -d '7 0' -m '7: second merge; change bar'
  $ echo >> foo
  $ hg ci -m '8: change foo'
  $ glog
  @  8 "8: change foo" files: foo
  |
  o    7 "7: second merge; change bar" files: bar baz
  |\
  | o  6 "6: change foo baz" files: baz foo
  | |
  o |  5 "5: change bar baz quux" files: bar baz quux
  |/
  o    4 "4: first merge; change bar baz" files: bar baz
  |\
  | o  3 "3: change bar quux" files: bar quux
  | |
  o |  2 "2: change foo" files: foo
  |/
  o  1 "1: add bar quux; copy foo to copied" files: bar copied dir/file4 quux
  |
  o  0 "0: add foo baz dir/" files: baz dir/file dir/file2 dir/file3 dir/subdir/file3 dir/subdir/file4 foo
  

final file versions in this repo:

  $ hg manifest --debug
  9463f52fe115e377cf2878d4fc548117211063f2 644   bar
  94c1be4dfde2ee8d78db8bbfcf81210813307c3d 644   baz
  7711d36246cc83e61fb29cd6d4ef394c63f1ceaf 644   copied
  3e20847584beff41d7cd16136b7331ab3d754be0 644   dir/file
  75e6d3f8328f5f6ace6bf10b98df793416a09dca 644   dir/file2
  e96dce0bc6a217656a3a410e5e6bec2c4f42bf7c 644   dir/file3
  6edd55f559cdce67132b12ca09e09cee08b60442 644   dir/file4
  5fe139720576e18e34bcc9f79174db8897c8afe9 644   dir/subdir/file3
  57a1c1511590f3de52874adfa04effe8a77d64af 644   dir/subdir/file4
  9a7b52012991e4873687192c3e17e61ba3e837a3 644   foo
  bc3eca3f47023a3e70ca0d8cc95a22a6827db19d 644   quux
  $ hg debugrename copied
  copied renamed from foo:2ed2a3912a0b24502043eae84ee4b279c18b90dd

  $ cd ..


Test interaction with startrev and verify that changing it is handled properly:

  $ > empty
  $ hg convert --filemap empty source movingstart --config convert.hg.startrev=3 -r4
  initializing destination movingstart repository
  scanning source...
  sorting...
  converting...
  1 3: change bar quux
  0 4: first merge; change bar baz
  $ hg convert --filemap empty source movingstart
  scanning source...
  sorting...
  converting...
  3 5: change bar baz quux
  2 6: change foo baz
  1 7: second merge; change bar
  warning: af455ce4166b3c9c88e6309c2b9332171dcea595 parent 61e22ca76c3b3e93df20338c4e02ce286898e825 is missing
  warning: cf908b3eeedc301c9272ebae931da966d5b326c7 parent 59e1ab45c888289513b7354484dac8a88217beab is missing
  0 8: change foo


splitrepo tests

  $ splitrepo()
  > {
  >     msg="$1"
  >     files="$2"
  >     opts=$3
  >     echo "% $files: $msg"
  >     prefix=`echo "$files" | sed -e 's/ /-/g'`
  >     fmap="$prefix.fmap"
  >     repo="$prefix.repo"
  >     for i in $files; do
  >         echo "include $i" >> "$fmap"
  >     done
  >     hg -q convert $opts --filemap "$fmap" --datesort source "$repo"
  >     hg up -q -R "$repo"
  >     glog -R "$repo"
  >     hg -R "$repo" manifest --debug
  > }
  $ splitrepo 'skip unwanted merges; use 1st parent in 1st merge, 2nd in 2nd' foo
  % foo: skip unwanted merges; use 1st parent in 1st merge, 2nd in 2nd
  @  3 "8: change foo" files: foo
  |
  o  2 "6: change foo baz" files: foo
  |
  o  1 "2: change foo" files: foo
  |
  o  0 "0: add foo baz dir/" files: foo
  
  9a7b52012991e4873687192c3e17e61ba3e837a3 644   foo
  $ splitrepo 'merges are not merges anymore' bar
  % bar: merges are not merges anymore
  @  4 "7: second merge; change bar" files: bar
  |
  o  3 "5: change bar baz quux" files: bar
  |
  o  2 "4: first merge; change bar baz" files: bar
  |
  o  1 "3: change bar quux" files: bar
  |
  o  0 "1: add bar quux; copy foo to copied" files: bar
  
  9463f52fe115e377cf2878d4fc548117211063f2 644   bar
  $ splitrepo '1st merge is not a merge anymore; 2nd still is' baz
  % baz: 1st merge is not a merge anymore; 2nd still is
  @    4 "7: second merge; change bar" files: baz
  |\
  | o  3 "6: change foo baz" files: baz
  | |
  o |  2 "5: change bar baz quux" files: baz
  |/
  o  1 "4: first merge; change bar baz" files: baz
  |
  o  0 "0: add foo baz dir/" files: baz
  
  94c1be4dfde2ee8d78db8bbfcf81210813307c3d 644   baz
  $ splitrepo 'we add additional merges when they are interesting' 'foo quux'
  % foo quux: we add additional merges when they are interesting
  @  8 "8: change foo" files: foo
  |
  o    7 "7: second merge; change bar" files:
  |\
  | o  6 "6: change foo baz" files: foo
  | |
  o |  5 "5: change bar baz quux" files: quux
  |/
  o    4 "4: first merge; change bar baz" files:
  |\
  | o  3 "3: change bar quux" files: quux
  | |
  o |  2 "2: change foo" files: foo
  |/
  o  1 "1: add bar quux; copy foo to copied" files: quux
  |
  o  0 "0: add foo baz dir/" files: foo
  
  9a7b52012991e4873687192c3e17e61ba3e837a3 644   foo
  bc3eca3f47023a3e70ca0d8cc95a22a6827db19d 644   quux
  $ splitrepo 'partial conversion' 'bar quux' '-r 3'
  % bar quux: partial conversion
  @  1 "3: change bar quux" files: bar quux
  |
  o  0 "1: add bar quux; copy foo to copied" files: bar quux
  
  b79105bedc55102f394e90a789c9c380117c1b4a 644   bar
  db0421cc6b685a458c8d86c7d5c004f94429ea23 644   quux
  $ splitrepo 'complete the partial conversion' 'bar quux'
  % bar quux: complete the partial conversion
  @  4 "7: second merge; change bar" files: bar
  |
  o  3 "5: change bar baz quux" files: bar quux
  |
  o  2 "4: first merge; change bar baz" files: bar
  |
  o  1 "3: change bar quux" files: bar quux
  |
  o  0 "1: add bar quux; copy foo to copied" files: bar quux
  
  9463f52fe115e377cf2878d4fc548117211063f2 644   bar
  bc3eca3f47023a3e70ca0d8cc95a22a6827db19d 644   quux
  $ rm -r foo.repo
  $ splitrepo 'partial conversion' 'foo' '-r 3'
  % foo: partial conversion
  @  0 "0: add foo baz dir/" files: foo
  
  2ed2a3912a0b24502043eae84ee4b279c18b90dd 644   foo
  $ splitrepo 'complete the partial conversion' 'foo'
  % foo: complete the partial conversion
  @  3 "8: change foo" files: foo
  |
  o  2 "6: change foo baz" files: foo
  |
  o  1 "2: change foo" files: foo
  |
  o  0 "0: add foo baz dir/" files: foo
  
  9a7b52012991e4873687192c3e17e61ba3e837a3 644   foo
  $ splitrepo 'copied file; source not included in new repo' copied
  % copied: copied file; source not included in new repo
  @  0 "1: add bar quux; copy foo to copied" files: copied
  
  2ed2a3912a0b24502043eae84ee4b279c18b90dd 644   copied
  $ hg --cwd copied.repo debugrename copied
  copied not renamed
  $ splitrepo 'copied file; source included in new repo' 'foo copied'
  % foo copied: copied file; source included in new repo
  @  4 "8: change foo" files: foo
  |
  o  3 "6: change foo baz" files: foo
  |
  o  2 "2: change foo" files: foo
  |
  o  1 "1: add bar quux; copy foo to copied" files: copied
  |
  o  0 "0: add foo baz dir/" files: foo
  
  7711d36246cc83e61fb29cd6d4ef394c63f1ceaf 644   copied
  9a7b52012991e4873687192c3e17e61ba3e837a3 644   foo
  $ hg --cwd foo-copied.repo debugrename copied
  copied renamed from foo:2ed2a3912a0b24502043eae84ee4b279c18b90dd

verify the top level 'include .' if there is no other includes:

  $ echo "exclude something" > default.fmap
  $ hg convert -q --filemap default.fmap -r1 source dummydest2
  $ hg -R dummydest2 log --template '{rev} {node|short} {desc|firstline}\n'
  1 61e22ca76c3b 1: add bar quux; copy foo to copied
  0 c085cf2ee7fe 0: add foo baz dir/

  $ echo "include somethingelse" >> default.fmap
  $ hg convert -q --filemap default.fmap -r1 source dummydest3
  $ hg -R dummydest3 log --template '{rev} {node|short} {desc|firstline}\n'

  $ echo "include ." >> default.fmap
  $ hg convert -q --filemap default.fmap -r1 source dummydest4
  $ hg -R dummydest4 log --template '{rev} {node|short} {desc|firstline}\n'
  1 61e22ca76c3b 1: add bar quux; copy foo to copied
  0 c085cf2ee7fe 0: add foo baz dir/

ensure that the filemap contains duplicated slashes (issue3612)

  $ cat > renames.fmap <<EOF
  > include dir
  > exclude dir/file2
  > rename dir dir2//dir3
  > include foo
  > include copied
  > rename foo foo2/
  > rename copied ./copied2
  > exclude dir/subdir
  > include dir/subdir/file3
  > EOF
  $ rm source/.hg/store/data/dir/file3.i
  $ rm source/.hg/store/data/dir/file4.i
  $ hg -q convert --filemap renames.fmap --datesort source dummydest
  abort: data/dir/file3.i@e96dce0bc6a2: no match found!
  [255]
  $ hg -q convert --filemap renames.fmap --datesort --config convert.hg.ignoreerrors=1 source renames.repo
  ignoring: data/dir/file3.i@e96dce0bc6a2: no match found
  ignoring: data/dir/file4.i@6edd55f559cd: no match found
  $ hg up -q -R renames.repo
  $ glog -R renames.repo
  @  4 "8: change foo" files: foo2
  |
  o  3 "6: change foo baz" files: foo2
  |
  o  2 "2: change foo" files: foo2
  |
  o  1 "1: add bar quux; copy foo to copied" files: copied2
  |
  o  0 "0: add foo baz dir/" files: dir2/dir3/file dir2/dir3/subdir/file3 foo2
  
  $ hg -R renames.repo verify
  checking changesets
  checking manifests
  crosschecking files in changesets and manifests
  checking files
  4 files, 5 changesets, 7 total revisions

  $ hg -R renames.repo manifest --debug
  d43feacba7a4f1f2080dde4a4b985bd8a0236d46 644   copied2
  3e20847584beff41d7cd16136b7331ab3d754be0 644   dir2/dir3/file
  5fe139720576e18e34bcc9f79174db8897c8afe9 644   dir2/dir3/subdir/file3
  9a7b52012991e4873687192c3e17e61ba3e837a3 644   foo2
  $ hg --cwd renames.repo debugrename copied2
  copied2 renamed from foo2:2ed2a3912a0b24502043eae84ee4b279c18b90dd

copied:

  $ hg --cwd source cat copied
  foo

copied2:

  $ hg --cwd renames.repo cat copied2
  foo

filemap errors

  $ cat > errors.fmap <<EOF
  > include dir/ # beware that comments changes error line numbers!
  > exclude /dir
  > rename dir//dir /dir//dir/ "out of sync"
  > include
  > EOF
  $ hg -q convert --filemap errors.fmap source errors.repo
  errors.fmap:3: superfluous / in include '/dir'
  errors.fmap:3: superfluous / in rename '/dir'
  errors.fmap:4: unknown directive 'out of sync'
  errors.fmap:5: path to exclude is missing
  abort: errors in filemap
  [255]

test branch closing revision pruning if branch is pruned

  $ hg init branchpruning
  $ cd branchpruning
  $ hg branch foo
  marked working directory as branch foo
  (branches are permanent and global, did you want a bookmark?)
  $ echo a > a
  $ hg ci -Am adda
  adding a
  $ hg ci --close-branch -m closefoo
  $ hg up 0
  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg branch empty
  marked working directory as branch empty
  (branches are permanent and global, did you want a bookmark?)
  $ hg ci -m emptybranch
  $ hg ci --close-branch -m closeempty
  $ hg up 0
  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg branch default
  marked working directory as branch default
  (branches are permanent and global, did you want a bookmark?)
  $ echo b > b
  $ hg ci -Am addb
  adding b
  $ hg ci --close-branch -m closedefault
  $ cat > filemap <<EOF
  > include b
  > EOF
  $ cd ..
  $ hg convert branchpruning branchpruning-hg1
  initializing destination branchpruning-hg1 repository
  scanning source...
  sorting...
  converting...
  5 adda
  4 closefoo
  3 emptybranch
  2 closeempty
  1 addb
  0 closedefault
  $ glog -R branchpruning-hg1
  _  5 "closedefault" files:
  |
  o  4 "addb" files: b
  |
  | _  3 "closeempty" files:
  | |
  | o  2 "emptybranch" files:
  |/
  | _  1 "closefoo" files:
  |/
  o  0 "adda" files: a
  

exercise incremental conversion at the same time

  $ hg convert -r0 --filemap branchpruning/filemap branchpruning branchpruning-hg2
  initializing destination branchpruning-hg2 repository
  scanning source...
  sorting...
  converting...
  0 adda
  $ hg convert -r4 --filemap branchpruning/filemap branchpruning branchpruning-hg2
  scanning source...
  sorting...
  converting...
  0 addb
  $ hg convert --filemap branchpruning/filemap branchpruning branchpruning-hg2
  scanning source...
  sorting...
  converting...
  3 closefoo
  2 emptybranch
  1 closeempty
  0 closedefault
  $ glog -R branchpruning-hg2
  _  1 "closedefault" files:
  |
  o  0 "addb" files: b
  

Test rebuilding of map with unknown revisions in shamap - it used to crash

  $ cd branchpruning
  $ hg up -r 2
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ hg merge 4
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  (branch merge, don't forget to commit)
  $ hg ci -m 'merging something'
  $ cd ..
  $ echo "53792d18237d2b64971fa571936869156655338d 6d955580116e82c4b029bd30f321323bae71a7f0" >> branchpruning-hg2/.hg/shamap
  $ hg convert --filemap branchpruning/filemap branchpruning branchpruning-hg2 --debug --config progress.debug=true
  run hg source pre-conversion action
  run hg sink pre-conversion action
  scanning source...
  scanning: 1 revisions
  sorting...
  converting...
  0 merging something
  source: 2503605b178fe50e8fbbb0e77b97939540aa8c87
  converting: 0/1 revisions (0.00%)
  unknown revmap source: 53792d18237d2b64971fa571936869156655338d
  run hg sink post-conversion action
  run hg source post-conversion action


filemap rename undoing revision rename

  $ hg init renameundo
  $ cd renameundo
  $ echo 1 > a
  $ echo 1 > c
  $ hg ci -qAm add
  $ hg mv -q a b/a
  $ hg mv -q c b/c
  $ hg ci -qm rename
  $ echo 2 > b/a
  $ echo 2 > b/c
  $ hg ci -qm modify
  $ cd ..

  $ echo "rename b ." > renameundo.fmap
  $ hg convert --filemap renameundo.fmap renameundo renameundo2
  initializing destination renameundo2 repository
  scanning source...
  sorting...
  converting...
  2 add
  1 rename
  filtering out empty revision
  repository tip rolled back to revision 0 (undo convert)
  0 modify
  $ glog -R renameundo2
  o  1 "modify" files: a c
  |
  o  0 "add" files: a c
  


test merge parents/empty merges pruning

  $ glog()
  > {
  >     hg log -G --template '{rev}:{node|short}@{branch} "{desc}" files: {files}\n' "$@"
  > }

test anonymous branch pruning

  $ hg init anonymousbranch
  $ cd anonymousbranch
  $ echo a > a
  $ echo b > b
  $ hg ci -Am add
  adding a
  adding b
  $ echo a >> a
  $ hg ci -m changea
  $ hg up 0
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ echo b >> b
  $ hg ci -m changeb
  created new head
  $ hg up 1
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg merge
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  (branch merge, don't forget to commit)
  $ hg ci -m merge
  $ cd ..

  $ cat > filemap <<EOF
  > include a
  > EOF
  $ hg convert --filemap filemap anonymousbranch anonymousbranch-hg
  initializing destination anonymousbranch-hg repository
  scanning source...
  sorting...
  converting...
  3 add
  2 changea
  1 changeb
  0 merge
  $ glog -R anonymousbranch
  @    3:c71d5201a498@default "merge" files:
  |\
  | o  2:607eb44b17f9@default "changeb" files: b
  | |
  o |  1:1f60ea617824@default "changea" files: a
  |/
  o  0:0146e6129113@default "add" files: a b
  
  $ glog -R anonymousbranch-hg
  o  1:cda818e7219b@default "changea" files: a
  |
  o  0:c334dc3be0da@default "add" files: a
  
  $ cat anonymousbranch-hg/.hg/shamap
  0146e6129113dba9ac90207cfdf2d7ed35257ae5 c334dc3be0daa2a4e9ce4d2e2bdcba40c09d4916
  1f60ea61782421edf8d051ff4fcb61b330f26a4a cda818e7219b5f7f3fb9f49780054ed6a1905ec3
  607eb44b17f9348cd5cbd26e16af87ba77b0b037 c334dc3be0daa2a4e9ce4d2e2bdcba40c09d4916
  c71d5201a498b2658d105a6bf69d7a0df2649aea cda818e7219b5f7f3fb9f49780054ed6a1905ec3

  $ cat > filemap <<EOF
  > include b
  > EOF
  $ hg convert --filemap filemap anonymousbranch anonymousbranch-hg2
  initializing destination anonymousbranch-hg2 repository
  scanning source...
  sorting...
  converting...
  3 add
  2 changea
  1 changeb
  0 merge
  $ glog -R anonymousbranch
  @    3:c71d5201a498@default "merge" files:
  |\
  | o  2:607eb44b17f9@default "changeb" files: b
  | |
  o |  1:1f60ea617824@default "changea" files: a
  |/
  o  0:0146e6129113@default "add" files: a b
  
  $ glog -R anonymousbranch-hg2
  o  1:62dd350b0df6@default "changeb" files: b
  |
  o  0:4b9ced861657@default "add" files: b
  
  $ cat anonymousbranch-hg2/.hg/shamap
  0146e6129113dba9ac90207cfdf2d7ed35257ae5 4b9ced86165703791653059a1db6ed864630a523
  1f60ea61782421edf8d051ff4fcb61b330f26a4a 4b9ced86165703791653059a1db6ed864630a523
  607eb44b17f9348cd5cbd26e16af87ba77b0b037 62dd350b0df695f7d2c82a02e0499b16fd790f22
  c71d5201a498b2658d105a6bf69d7a0df2649aea 62dd350b0df695f7d2c82a02e0499b16fd790f22

test named branch pruning

  $ hg init namedbranch
  $ cd namedbranch
  $ echo a > a
  $ echo b > b
  $ hg ci -Am add
  adding a
  adding b
  $ echo a >> a
  $ hg ci -m changea
  $ hg up 0
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg branch foo
  marked working directory as branch foo
  (branches are permanent and global, did you want a bookmark?)
  $ echo b >> b
  $ hg ci -m changeb
  $ hg up default
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg merge foo
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  (branch merge, don't forget to commit)
  $ hg ci -m merge
  $ cd ..

  $ cat > filemap <<EOF
  > include a
  > EOF
  $ hg convert --filemap filemap namedbranch namedbranch-hg
  initializing destination namedbranch-hg repository
  scanning source...
  sorting...
  converting...
  3 add
  2 changea
  1 changeb
  0 merge
  $ glog -R namedbranch
  @    3:73899bcbe45c@default "merge" files:
  |\
  | o  2:8097982d19fc@foo "changeb" files: b
  | |
  o |  1:1f60ea617824@default "changea" files: a
  |/
  o  0:0146e6129113@default "add" files: a b
  
  $ glog -R namedbranch-hg
  o  1:cda818e7219b@default "changea" files: a
  |
  o  0:c334dc3be0da@default "add" files: a
  

  $ cd namedbranch
  $ hg --config extensions.mq= strip tip
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  saved backup bundle to $TESTTMP/namedbranch/.hg/strip-backup/73899bcbe45c-92adf160-backup.hg
  $ hg up foo
  2 files updated, 0 files merged, 0 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
  $ cd ..

  $ hg convert --filemap filemap namedbranch namedbranch-hg2
  initializing destination namedbranch-hg2 repository
  scanning source...
  sorting...
  converting...
  3 add
  2 changea
  1 changeb
  0 merge
  $ glog -R namedbranch
  @    3:e1959de76e1b@foo "merge" files:
  |\
  | o  2:8097982d19fc@foo "changeb" files: b
  | |
  o |  1:1f60ea617824@default "changea" files: a
  |/
  o  0:0146e6129113@default "add" files: a b
  
  $ glog -R namedbranch-hg2
  o    2:dcf314454667@foo "merge" files:
  |\
  | o  1:cda818e7219b@default "changea" files: a
  |/
  o  0:c334dc3be0da@default "add" files: a
  
  $ cd ..

test converting merges into a repo that contains other files

  $ hg init merge-test1
  $ cd merge-test1
  $ touch a && hg commit -Aqm 'add a'
  $ echo a > a && hg commit -Aqm 'edit a'
  $ hg up -q 0
  $ touch b && hg commit -Aqm 'add b'
  $ hg merge -q 1 && hg commit -qm 'merge a & b'

  $ cd ..
  $ hg init merge-test2
  $ cd merge-test2
  $ mkdir converted
  $ touch converted/a toberemoved && hg commit -Aqm 'add converted/a & toberemoved'
  $ touch x && rm toberemoved && hg commit -Aqm 'add x & remove tobremoved'
  $ cd ..
  $ hg log -G -T '{shortest(node)} {desc}' -R merge-test1
  @    1191 merge a & b
  |\
  | o  9077 add b
  | |
  o |  d19f edit a
  |/
  o  ac82 add a
  
  $ hg log -G -T '{shortest(node)} {desc}' -R merge-test2
  @  150e add x & remove tobremoved
  |
  o  bbac add converted/a & toberemoved
  
- Build a shamap where the target converted/a is in on top of an unrelated
- change to 'x'. This simulates using convert to merge several repositories
- together.
  $ cat >> merge-test2/.hg/shamap <<EOF
  > $(hg -R merge-test1 log -r 0 -T '{node}') $(hg -R merge-test2 log -r 0 -T '{node}')
  > $(hg -R merge-test1 log -r 1 -T '{node}') $(hg -R merge-test2 log -r 1 -T '{node}')
  > EOF
  $ cat >> merge-test-filemap <<EOF
  > rename . converted/
  > EOF
  $ hg convert --filemap merge-test-filemap merge-test1 merge-test2 --traceback
  scanning source...
  sorting...
  converting...
  1 add b
  0 merge a & b
  $ hg -R merge-test2 manifest -r tip
  converted/a
  converted/b
  x
  $ hg -R merge-test2 log -G -T '{shortest(node)} {desc}\n{files % "- {file}\n"}\n'
  o    6eaa merge a & b
  |\   - converted/a
  | |  - toberemoved
  | |
  | o  2995 add b
  | |  - converted/b
  | |
  @ |  150e add x & remove tobremoved
  |/   - toberemoved
  |    - x
  |
  o  bbac add converted/a & toberemoved
     - converted/a
     - toberemoved
  
  $ cd ..

Test case where cleanp2 contains a file that doesn't exist in p2 - for
example because filemap changed.

  $ hg init cleanp2
  $ cd cleanp2
  $ touch f f1 f2 && hg ci -Aqm '0'
  $ echo f1 > f1 && echo >> f && hg ci -m '1'
  $ hg up -qr0 && echo f2 > f2 && echo >> f && hg ci -qm '2'
  $ echo "include f" > filemap
  $ hg convert --filemap filemap .
  assuming destination .-hg
  initializing destination .-hg repository
  scanning source...
  sorting...
  converting...
  2 0
  1 1
  0 2
  $ hg merge && hg ci -qm '3'
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  (branch merge, don't forget to commit)
  $ echo "include ." > filemap
  $ hg convert --filemap filemap .
  assuming destination .-hg
  scanning source...
  sorting...
  converting...
  0 3
  $ hg -R .-hg log -G -T '{shortest(node)} {desc}\n{files % "- {file}\n"}\n'
  o    e9ed 3
  |\
  | o  33a0 2
  | |  - f
  | |
  o |  f73e 1
  |/   - f
  |
  o  d681 0
     - f
  
  $ hg -R .-hg mani -r tip
  f
  $ cd ..