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From: Thomas Gummerer <t.gummerer@gmail.com>
To: Duy Nguyen <pclouds@gmail.com>
Cc: Git Mailing List <git@vger.kernel.org>,
	Eric Sunshine <sunshine@sunshineco.com>
Subject: Re: [PATCH] worktree: teach "add" to check out existing branches
Date: Mon, 22 Jan 2018 20:17:28 +0000
Message-ID: <20180122201728.GA2130@hank> (raw)
In-Reply-To: <CACsJy8D9LS7e=cVE3Fq2qOnxK5++nFg2vjuhkNtRO-Bx0X1j6w@mail.gmail.com>

On 01/22, Duy Nguyen wrote:
> On Sun, Jan 21, 2018 at 7:02 PM, Thomas Gummerer <t.gummerer@gmail.com> wrote:
> > [...]
> >  +
> >  If `<commit-ish>` is omitted and neither `-b` nor `-B` nor `--detach` used,
> > -then, as a convenience, a new branch based at HEAD is created automatically,
> > -as if `-b $(basename <path>)` was specified.
> > +then, as a convenience, a worktree with a branch named after
> > +`$(basename <path>)` (call it `<branch>`) is created.  If `<branch>`
> > +doesn't exist, a new branch based on HEAD is automatically created as
> > +if `-b <branch>` was given.  If `<branch>` exists in the repository,
> > +it will be checked out in the new worktree, if it's not checked out
> > +anywhere else, otherwise the command will refuse to create the
> > +worktree.
> 
> It starts getting a bit too magical to me. We probably should print
> something "switching to branch..." or "creating new branch ..."  to
> let people know what decision was taken, unless --quiet is given. Yeah
> I know --quiet does not exist. You don't need to add it now either
> since nobody has asked for it.

I think that's a good idea.  I'll add that, thanks.

> More or less related to this, there was a question [1] whether we
> could do better than $(basename <path>) for determining branch name.
> Since you're doing start to check if a branch exists, people may start
> asking to check for branch "foo/bar" from the path abc/foo/bar instead
> of just branch "bar".

Thanks for pointing me at this.  I feel like we might get ourselves
some backwards compatibility worries when doing that.  Lets say
someone has a branch 'feature/a', using 'git worktree feature/a' would
currently create a new branch 'a', and does not die.

I'd guess most users would want 'feature/a' checked out in that case,
but we can't exactly be sure we won't break anyones workflow here.
With your suggestion I guess that would be mitigated somehow as it
shows which action is taken, but dunno.

Should we hide this behaviour behind a flag, and plan for it
eventually becoming the default?

> [1] https://github.com/git-for-windows/git/issues/1390
> 
> >
> >  list::
> >
> > diff --git a/builtin/worktree.c b/builtin/worktree.c
> > index 7cef5b120b..148a864bb9 100644
> > --- a/builtin/worktree.c
> > +++ b/builtin/worktree.c
> > @@ -411,13 +411,21 @@ static int add(int ac, const char **av, const char *prefix)
> >         if (ac < 2 && !opts.new_branch && !opts.detach) {
> >                 int n;
> >                 const char *s = worktree_basename(path, &n);
> > -               opts.new_branch = xstrndup(s, n);
> > -               if (guess_remote) {
> > -                       struct object_id oid;
> > -                       const char *remote =
> > -                               unique_tracking_name(opts.new_branch, &oid);
> > -                       if (remote)
> > -                               branch = remote;
> > +               const char *branchname = xstrndup(s, n);
> > +               struct strbuf ref = STRBUF_INIT;
> 
> Perhaps a blank line after this to separate var declarations and the rest.

Will add. 

> > +               if (!strbuf_check_branch_ref(&ref, branchname) &&
> > +                   ref_exists(ref.buf)) {
> > +                       branch = branchname;
> 
> Hmm.. do we need UNLEAK(branch);? Maybe you should try valgrind, I'm not sure.

Good question, I'll have a look, thanks.

> > +                       opts.checkout = 1;
> > +               } else {
> > +                       opts.new_branch = branchname;
> > +                       if (guess_remote) {
> > +                               struct object_id oid;
> > +                               const char *remote =
> > +                                       unique_tracking_name(opts.new_branch, &oid);
> > +                               if (remote)
> > +                                       branch = remote;
> > +                       }
> >                 }
> >         }
> >
> > diff --git a/t/t2025-worktree-add.sh b/t/t2025-worktree-add.sh
> > index 2b95944973..721b0e4c26 100755
> > --- a/t/t2025-worktree-add.sh
> > +++ b/t/t2025-worktree-add.sh
> > @@ -198,13 +198,22 @@ test_expect_success '"add" with <branch> omitted' '
> >         test_cmp_rev HEAD bat
> >  '
> >
> > -test_expect_success '"add" auto-vivify does not clobber existing branch' '
> > +test_expect_success '"add" auto-vivify checks out existing branch' '
> >         test_commit c1 &&
> >         test_commit c2 &&
> >         git branch precious HEAD~1 &&
> > -       test_must_fail git worktree add precious &&
> > +       git worktree add precious &&
> >         test_cmp_rev HEAD~1 precious &&
> > -       test_path_is_missing precious
> > +       (
> > +               cd precious &&
> > +               test_cmp_rev precious HEAD
> > +       )
> > +'
> > +
> > +test_expect_success '"add" auto-vivify fails with checked out branch' '
> > +       git checkout -b test-branch &&
> > +       test_must_fail git worktree add test-branch &&
> > +       test_path_is_missing test-branch
> >  '
> >
> >  test_expect_success '"add" no auto-vivify with --detach and <branch> omitted' '
> > --
> > 2.16.0.312.g896df04e46
> >
> 
> 
> 
> -- 
> Duy

  reply index

Thread overview: 112+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-01-21 12:02 Thomas Gummerer
2018-01-21 12:02 ` Robert P. J. Day
2018-01-22 11:18 ` Duy Nguyen
2018-01-22 20:17   ` Thomas Gummerer [this message]
2018-02-04 22:13 ` [PATCH v2 0/3] " Thomas Gummerer
2018-02-04 22:13   ` [PATCH v2 1/3] worktree: improve message when creating a new worktree Thomas Gummerer
2018-02-05  2:12     ` Duy Nguyen
2018-02-05 20:13       ` Thomas Gummerer
2018-02-05 20:15       ` Junio C Hamano
2018-02-07  8:51       ` Eric Sunshine
2018-02-09 11:27         ` Thomas Gummerer
2018-02-09 12:08           ` Duy Nguyen
2018-02-10 11:20             ` Duy Nguyen
2018-02-04 22:13   ` [PATCH v2 2/3] worktree: be clearer when "add" dwim-ery kicks in Thomas Gummerer
2018-02-04 22:13   ` [PATCH v2 3/3] worktree: teach "add" to check out existing branches Thomas Gummerer
2018-02-05  2:18     ` Duy Nguyen
2018-02-05 20:20       ` Junio C Hamano
2018-02-05 20:23       ` Thomas Gummerer
2018-02-06 11:53         ` Duy Nguyen
2018-02-09 11:04           ` Thomas Gummerer
2018-03-17 22:08   ` [PATCH v3 0/4] " Thomas Gummerer
2018-03-17 22:08     ` [PATCH v3 1/4] worktree: improve message when creating a new worktree Thomas Gummerer
2018-03-17 22:08     ` [PATCH v3 2/4] worktree: be clearer when "add" dwim-ery kicks in Thomas Gummerer
2018-03-17 22:08     ` [PATCH v3 3/4] worktree: factor out dwim_branch function Thomas Gummerer
2018-03-17 22:08     ` [PATCH v3 4/4] worktree: teach "add" to check out existing branches Thomas Gummerer
2018-03-17 22:22     ` [PATCH v4 0/4] " Thomas Gummerer
2018-03-17 22:22       ` [PATCH v4 1/4] worktree: improve message when creating a new worktree Thomas Gummerer
2018-03-19 17:11         ` Duy Nguyen
2018-03-19 18:09           ` Junio C Hamano
2018-03-20  6:37         ` Eric Sunshine
2018-03-24 20:34           ` Thomas Gummerer
2018-03-17 22:22       ` [PATCH v4 2/4] worktree: be clearer when "add" dwim-ery kicks in Thomas Gummerer
2018-03-20  6:40         ` Eric Sunshine
2018-03-20  7:26         ` Eric Sunshine
2018-03-20  7:32           ` Eric Sunshine
2018-03-24 20:35             ` Thomas Gummerer
2018-03-17 22:22       ` [PATCH v4 3/4] worktree: factor out dwim_branch function Thomas Gummerer
2018-03-17 22:22       ` [PATCH v4 4/4] worktree: teach "add" to check out existing branches Thomas Gummerer
2018-03-20  8:02         ` Eric Sunshine
2018-03-24 21:00           ` Thomas Gummerer
2018-03-25 13:49       ` [PATCH v5 0/6] " Thomas Gummerer
2018-03-25 13:49         ` [PATCH v5 1/6] worktree: improve message when creating a new worktree Thomas Gummerer
2018-03-25 13:49         ` [PATCH v5 2/6] worktree: be clearer when "add" dwim-ery kicks in Thomas Gummerer
2018-03-27  8:59           ` Eric Sunshine
2018-03-30 13:53             ` Thomas Gummerer
2018-03-25 13:49         ` [PATCH v5 3/6] worktree: remove force_new_branch from struct add_opts Thomas Gummerer
2018-03-27  9:00           ` Eric Sunshine
2018-03-30 13:55             ` Thomas Gummerer
2018-03-25 13:49         ` [PATCH v5 4/6] worktree: factor out dwim_branch function Thomas Gummerer
2018-03-27  9:01           ` Eric Sunshine
2018-03-25 13:49         ` [PATCH v5 5/6] worktree: teach "add" to check out existing branches Thomas Gummerer
2018-03-27  9:04           ` Eric Sunshine
2018-03-30 14:04             ` Thomas Gummerer
2018-03-25 13:49         ` [PATCH v5 6/6] t2025: rename now outdated branch name Thomas Gummerer
2018-03-27  8:58         ` [PATCH v5 0/6] worktree: teach "add" to check out existing branches Eric Sunshine
2018-03-30 14:08           ` Thomas Gummerer
2018-03-31 15:17         ` [PATCH v6 " Thomas Gummerer
2018-03-31 15:17           ` [PATCH v6 1/6] worktree: remove extra members from struct add_opts Thomas Gummerer
2018-03-31 15:18           ` [PATCH v6 2/6] reset: introduce show-new-head-line option Thomas Gummerer
2018-04-02 20:29             ` Junio C Hamano
2018-04-02 22:07               ` Thomas Gummerer
2018-04-02 22:20               ` Thomas Gummerer
2018-04-02 20:34             ` Junio C Hamano
2018-04-02 22:09               ` Thomas Gummerer
2018-03-31 15:18           ` [PATCH v6 3/6] worktree: improve message when creating a new worktree Thomas Gummerer
2018-04-08  9:27             ` Eric Sunshine
2018-03-31 15:18           ` [PATCH v6 4/6] worktree: be clearer when "add" dwim-ery kicks in Thomas Gummerer
2018-03-31 15:18           ` [PATCH v6 5/6] worktree: factor out dwim_branch function Thomas Gummerer
2018-03-31 15:18           ` [PATCH v6 6/6] worktree: teach "add" to check out existing branches Thomas Gummerer
2018-04-01 13:11             ` [PATCH v6 6.5/6] fixup! " Thomas Gummerer
2018-04-09  0:23               ` Eric Sunshine
2018-04-09 19:44                 ` Thomas Gummerer
2018-04-09 21:35                   ` Eric Sunshine
2018-04-08 10:09             ` [PATCH v6 6/6] " Eric Sunshine
2018-04-08 14:30               ` Thomas Gummerer
2018-04-08  9:08           ` [PATCH v6 0/6] " Eric Sunshine
2018-04-08 14:24             ` Thomas Gummerer
2018-04-09  0:38               ` Eric Sunshine
2018-04-09 19:47                 ` Thomas Gummerer
2018-04-09 19:30             ` Thomas Gummerer
2018-04-09 22:06               ` Eric Sunshine
2018-04-11 20:09                 ` Thomas Gummerer
2018-04-11 20:48                   ` Eric Sunshine
2018-04-11 20:50                   ` Thomas Gummerer
2018-04-11 21:14                     ` Eric Sunshine
2018-04-15 20:29           ` [PATCH v7 0/4] " Thomas Gummerer
2018-04-15 20:29             ` [PATCH v7 1/4] worktree: remove extra members from struct add_opts Thomas Gummerer
2018-04-15 20:29             ` [PATCH v7 2/4] worktree: improve message when creating a new worktree Thomas Gummerer
2018-04-16  2:09               ` Junio C Hamano
2018-04-23 18:55                 ` Thomas Gummerer
2018-04-23  4:27               ` Eric Sunshine
2018-04-23 18:50                 ` Thomas Gummerer
2018-04-15 20:29             ` [PATCH v7 3/4] worktree: factor out dwim_branch function Thomas Gummerer
2018-04-15 20:29             ` [PATCH v7 4/4] worktree: teach "add" to check out existing branches Thomas Gummerer
2018-04-23  4:52             ` [PATCH v7 0/4] " Eric Sunshine
2018-04-23 19:38             ` [PATCH v8 " Thomas Gummerer
2018-04-23 19:38               ` [PATCH v8 1/4] worktree: remove extra members from struct add_opts Thomas Gummerer
2018-04-24  3:26                 ` Eric Sunshine
2018-04-23 19:38               ` [PATCH v8 2/4] worktree: improve message when creating a new worktree Thomas Gummerer
2018-04-24  3:58                 ` Eric Sunshine
2018-04-23 19:38               ` [PATCH v8 3/4] worktree: factor out dwim_branch function Thomas Gummerer
2018-04-23 19:38               ` [PATCH v8 4/4] worktree: teach "add" to check out existing branches Thomas Gummerer
2018-04-24  4:25                 ` Eric Sunshine
2018-04-24 21:56               ` [PATCH v9 0/4] " Thomas Gummerer
2018-04-24 21:56                 ` [PATCH v9 1/4] worktree: remove extra members from struct add_opts Thomas Gummerer
2018-04-24 21:56                 ` [PATCH v9 2/4] worktree: improve message when creating a new worktree Thomas Gummerer
2018-04-24 21:56                 ` [PATCH v9 3/4] worktree: factor out dwim_branch function Thomas Gummerer
2018-04-24 21:56                 ` [PATCH v9 4/4] worktree: teach "add" to check out existing branches Thomas Gummerer
2018-04-27  7:36                 ` [PATCH v9 0/4] " Eric Sunshine
2018-04-28 16:09                   ` Thomas Gummerer
2018-04-30  0:07                     ` Junio C Hamano
2018-03-18  0:24     ` [PATCH v3 " Junio C Hamano

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