This test requires pygit2:

  > $PYTHON -c 'import pygit2' || exit 80

Setup:

  > GIT_AUTHOR_NAME='test'; export GIT_AUTHOR_NAME

  > GIT_AUTHOR_EMAIL='test@example.org'; export GIT_AUTHOR_EMAIL

  > GIT_AUTHOR_DATE="2007-01-01 00:00:00 +0000"; export GIT_AUTHOR_DATE

  > GIT_COMMITTER_NAME="$GIT_AUTHOR_NAME"; export GIT_COMMITTER_NAME

  > GIT_COMMITTER_EMAIL="$GIT_AUTHOR_EMAIL"; export GIT_COMMITTER_EMAIL

  > GIT_COMMITTER_DATE="$GIT_AUTHOR_DATE"; export GIT_COMMITTER_DATE

  > count=10

  > gitcommit() {

  >    GIT_AUTHOR_DATE="2007-01-01 00:00:$count +0000";

  >    GIT_COMMITTER_DATE="$GIT_AUTHOR_DATE"

  >    git commit "$@" >/dev/null 2>/dev/null || echo "git commit error"

  >    count=`expr $count + 1`

  >  }

  > echo "[extensions]" >> $HGRCPATH

  > echo "git=" >> $HGRCPATH

Make a new repo with git:

  $ mkdir foo

  $ cd foo

  $ git init

  Initialized empty Git repository in $TESTTMP/foo/.git/

Ignore the .hg directory within git:

  $ echo .hg >> .git/info/exclude

  $ echo alpha > alpha

  $ git add alpha

  $ gitcommit -am 'Add alpha'

  $ echo beta > beta

  $ git add beta

  $ gitcommit -am 'Add beta'

  $ echo gamma > gamma

  $ git status

  On branch master

  Untracked files:

    (use "git add <file>..." to include in what will be committed)

  	gamma

  nothing added to commit but untracked files present (use "git add" to track)

Without creating the .hg, hg status fails:

  $ hg status

  abort: no repository found in '$TESTTMP/foo' (.hg not found)!

  [255]

But if you run hg init --git, it works:

  $ hg init --git

  $ hg id --traceback

  3d9be8deba43 tip master

  $ hg status

  ? gamma

Log works too:

  $ hg log

  changeset:   1:3d9be8deba43

  bookmark:    master

  tag:         tip

  user:        test <test@example.org>

  date:        Mon Jan 01 00:00:11 2007 +0000

  summary:     Add beta

  changeset:   0:c5864c9d16fb

  user:        test <test@example.org>

  date:        Mon Jan 01 00:00:10 2007 +0000

  summary:     Add alpha

and bookmarks:

  $ hg bookmarks

   * master                    1:3d9be8deba43

diff even works transparently in both systems:

  $ echo blah >> alpha

  $ git diff

  diff --git a/alpha b/alpha

  index 4a58007..faed1b7 100644

  --- a/alpha

  +++ b/alpha

  @@ -1* +1,2 @@ (glob)

   alpha

  +blah

  $ hg diff --git

  diff --git a/alpha b/alpha

  --- a/alpha

  +++ b/alpha

  @@ -1,1 +1,2 @@

   alpha

  +blah

Remove a file, it shows as such:

  $ rm alpha

  $ hg status

  ! alpha

  ? gamma

Revert works:

  $ hg revert alpha --traceback

  $ hg status

  ? gamma

  $ git status

  On branch master

  Untracked files:

    (use "git add <file>..." to include in what will be committed)

  	gamma

  nothing added to commit but untracked files present (use "git add" to track)

Add shows sanely in both:

  $ hg add gamma

  $ hg status

  A gamma

  $ hg files

  alpha

  beta

  gamma

  $ git ls-files

  alpha

  beta

  gamma

  $ git status

  On branch master

  Changes to be committed:

    (use "git restore --staged <file>..." to unstage)

  	new file:   gamma

forget does what it should as well:

  $ hg forget gamma

  $ hg status

  ? gamma

  $ git status

  On branch master

  Untracked files:

    (use "git add <file>..." to include in what will be committed)

  	gamma

  nothing added to commit but untracked files present (use "git add" to track)

clean up untracked file

  $ rm gamma

hg log FILE

  $ echo a >> alpha

  $ hg ci -m 'more alpha' --traceback --date '1583522787 18000'

  $ echo b >> beta

  $ hg ci -m 'more beta'

  $ echo a >> alpha

  $ hg ci -m 'even more alpha'

  $ hg log -G alpha

  @  changeset:   4:6626247b7dc8

  :  bookmark:    master

  :  tag:         tip

  :  user:        test <test>

  :  date:        Thu Jan 01 00:00:00 1970 +0000

  :  summary:     even more alpha

  :

  o  changeset:   2:a1983dd7fb19

  :  user:        test <test>

  :  date:        Fri Mar 06 14:26:27 2020 -0500

  :  summary:     more alpha

  :

  o  changeset:   0:c5864c9d16fb

     user:        test <test@example.org>

     date:        Mon Jan 01 00:00:10 2007 +0000

     summary:     Add alpha

  $ hg log -G beta

  o  changeset:   3:d8ee22687733

  :  user:        test <test>

  :  date:        Thu Jan 01 00:00:00 1970 +0000

  :  summary:     more beta

  :

  o  changeset:   1:3d9be8deba43

  |  user:        test <test@example.org>

  ~  date:        Mon Jan 01 00:00:11 2007 +0000

     summary:     Add beta

hg annotate

  $ hg annotate alpha

  0: alpha

  2: a

  4: a

  $ hg annotate beta

  1: beta

  3: b

Files in subdirectories. TODO: case-folding support, make this `A`

instead of `a`.

  $ mkdir a

  $ echo "This is file mu." > a/mu

  $ hg ci -A -m 'Introduce file a/mu'

  adding a/mu

Both hg and git agree a/mu is part of the repo

  $ git ls-files

  a/mu

  alpha

  beta

  $ hg files

  a/mu

  alpha

  beta

hg and git status both clean

  $ git status

  On branch master

  nothing to commit, working tree clean

  $ hg status