git: skeleton of a new extension to _directly_ operate on git repos
This is based in part of work I did years ago in hgit, but it's mostly
new code since I'm using pygit2 instead of dulwich and the hg storage
interfaces have improved. Some cleanup of old hgit code by Pulkit,
which I greatly appreciate.
test-git-interop.t does not cover a whole lot of cases, but it
passes. It includes status, diff, making a new commit, and `hg annotate`
working on the git repository.
This is _not_ (yet) production quality code: this is an
experiment. Known technical debt lurking in this implementation:
* Writing bookmarks just totally ignores transactions.
* The way progress is threaded down into the gitstore is awful.
* Ideally we'd find a way to incrementally reindex DAGs. I'm not sure
how to do that efficiently, so we might need a "known only fast-forwards"
mode on the DAG indexer for use on `hg commit` and friends.
* We don't even _try_ to do anything reasonable for `hg pull` or `hg push`.
* Mercurial need an interface for the changelog type.
Tests currently require git 2.24 as far as I'm aware: `git status` has
some changed output that I didn't try and handle in a compatible way.
This patch has produced some interesting cleanups, most recently on
the manifest type. I expect continuing down this road will produce
other meritorious cleanups throughout our code.
Differential Revision: https://phab.mercurial-scm.org/D6734
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
node|shortest works correctly
$ hg log -r tip --template "{node|shortest}\n"
6626
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