Test that extra metadata (renames, copies, and other extra metadata) roundtrips
across from hg to git
  $ . "$TESTDIR/testutil"

  $ git init -q gitrepo
  $ cd gitrepo
  $ touch a
  $ git add a
  $ fn_git_commit -ma
  $ git checkout -b not-master 2>&1 | sed s/\'/\"/g
  Switched to a new branch "not-master"

  $ cd ..
  $ hg clone -q gitrepo hgrepo
  $ cd hgrepo
  $ hg mv a b
  $ fn_hg_commit -mb
  $ hg up 0 | egrep -v '^\(leaving bookmark master\)$'
  1 files updated, 0 files merged, 1 files removed, 0 files unresolved
  $ touch c
  $ hg add c
  $ fn_hg_commit -mc

Rebase will add a rebase_source
  $ hg --config extensions.rebase= rebase -s 1 -d 2
  saved backup bundle to $TESTTMP/*.hg (glob)
  $ hg up 2
  1 files updated, 0 files merged, 1 files removed, 0 files unresolved

Add a commit with multiple extra fields
  $ hg bookmark b1
  $ touch d
  $ hg add d
  $ fn_hg_commitextra --field zzzzzzz=datazzz --field aaaaaaa=dataaaa
  $ hg log --graph --template "{rev} {node} {desc|firstline}\n{join(extras, ' ')}\n\n"
  @  3 f15e01c73845392d86a5ed10fb0753d09bca13d3
  |  aaaaaaa=dataaaa branch=default zzzzzzz=datazzz
  |
  o  2 dcec77c6ae3cff594c4435e5820bec4ec9e57440 b
  |  branch=default rebase_source=bb8ddb1031b5d9afd7caa5aa9d24c735222e3636
  |
  o  1 003b36e9c3993ac4319eeebd5f77a1d5306ba706 c
  |  branch=default
  |
  o  0 ab83abcbf5717f738191aa2d42f52a7100ce06a8 a
     branch=default
  
Make sure legacy extra (in commit message, after '--HG--') doesn't break
  $ hg push -r b1 --config git.debugextrainmessage=1
  pushing to $TESTTMP/gitrepo
  searching for changes
  adding objects
  added 3 commits with 3 trees and 0 blobs
  adding reference refs/heads/b1

  $ hg bookmark b2
  $ hg mv c c2
  $ hg mv d d2
  $ fn_hg_commitextra --field yyyyyyy=datayyy --field bbbbbbb=databbb
  $ hg log --graph --template "{rev} {node} {desc|firstline}\n{join(extras, ' ')}\n\n" -l 1
  @  4 71a7f7cc00a30dde4a0d5da37f119e51ded1820a
  |  bbbbbbb=databbb branch=default yyyyyyy=datayyy
  |
  $ hg push -r b2
  pushing to $TESTTMP/gitrepo
  searching for changes
  adding objects
  added 1 commits with 1 trees and 0 blobs
  adding reference refs/heads/b2

  $ cd ../gitrepo
  $ git cat-file commit b1
  tree 1b773a2eb70f29397356f8069c285394835ff85a
  parent 99316cce06b9b5aa9e5a3f4df124939583791dda
  author test <none@none> 1167609613 +0000
  committer test <none@none> 1167609613 +0000
  
  
  
  --HG--
  extra : aaaaaaa : dataaaa
  extra : zzzzzzz : datazzz

  $ git cat-file commit b2
  tree 34ad62c6d6ad9464bfe62db5b3d2fa16aaa9fa9e
  parent ca11864bb2a84c3996929d42cf38bae3d0f7aae0
  author test <none@none> 1167609614 +0000
  committer test <none@none> 1167609614 +0000
  HG:rename c:c2
  HG:rename d:d2
  HG:extra bbbbbbb:databbb
  HG:extra yyyyyyy:datayyy
  
  

  $ cd ../gitrepo
  $ git checkout b1
  Switched to branch 'b1'
  $ commit_sha=$(git rev-parse HEAD)
  $ tree_sha=$(git rev-parse HEAD^{tree})

There's no way to create a Git repo with extra metadata via the CLI. Dulwich
lets you do that, though.

  >>> from dulwich.objects import Commit
  >>> from dulwich.porcelain import open_repo
  >>> repo = open_repo('.')
  >>> c = Commit()
  >>> c.author = 'test <test@example.org>'
  >>> c.author_time = 0
  >>> c.author_timezone = 0
  >>> c.committer = c.author
  >>> c.commit_time = 0
  >>> c.commit_timezone = 0
  >>> c.parents = ['$commit_sha']
  >>> c.tree = '$tree_sha'
  >>> c.message = 'extra commit\n'
  >>> c.extra.extend([('zzz:zzz', 'data:zzz'), ('aaa:aaa', 'data:aaa'),
  ...                 ('HG:extra', 'hgaaa:dataaaa'),
  ...                 ('HG:extra', 'hgzzz:datazzz')])
  >>> repo.object_store.add_object(c)
  >>> repo.refs.set_if_equals('refs/heads/master', None, c.id)
  True

  $ git cat-file commit master
  tree 1b773a2eb70f29397356f8069c285394835ff85a
  parent ca11864bb2a84c3996929d42cf38bae3d0f7aae0
  author test <test@example.org> 0 +0000
  committer test <test@example.org> 0 +0000
  zzz:zzz data:zzz
  aaa:aaa data:aaa
  HG:extra hgaaa:dataaaa
  HG:extra hgzzz:datazzz
  
  extra commit

  $ cd ..
  $ hg clone -q gitrepo hgrepo2
  $ cd hgrepo2
  $ hg log --graph --template "{rev} {node} {desc|firstline}\n{join(extras, ' ')}\n\n"
  @  5 71a7f7cc00a30dde4a0d5da37f119e51ded1820a
  |  bbbbbbb=databbb branch=default yyyyyyy=datayyy
  |
  | o  4 f5fddc070b0648a5cddb98b43bbd527e98f4b4d2 extra commit
  |/   GIT0-zzz%3Azzz=data%3Azzz GIT1-aaa%3Aaaa=data%3Aaaa branch=default hgaaa=dataaaa hgzzz=datazzz
  |
  o  3 f15e01c73845392d86a5ed10fb0753d09bca13d3
  |  aaaaaaa=dataaaa branch=default zzzzzzz=datazzz
  |
  o  2 dcec77c6ae3cff594c4435e5820bec4ec9e57440 b
  |  branch=default rebase_source=bb8ddb1031b5d9afd7caa5aa9d24c735222e3636
  |
  o  1 003b36e9c3993ac4319eeebd5f77a1d5306ba706 c
  |  branch=default
  |
  o  0 ab83abcbf5717f738191aa2d42f52a7100ce06a8 a
     branch=default