Nguyễn Thái Ngọc Duy  <pclo...@gmail.com> writes:

> Current code does not update "symref" when -B is used. This string
> contains the new HEAD. Because it's empty "git worktree add -B" fails at
> symbolic-ref step.
>
> Because branch creation is already done before calling add_worktree(),
> -B is equivalent to -b from add_worktree() point of view. We do not need
> the special case for -B.
>
> Signed-off-by: Nguyễn Thái Ngọc Duy <pclo...@gmail.com>
> ---
>  Complete patch.
>
>  builtin/worktree.c      | 4 +---
>  t/t2025-worktree-add.sh | 8 ++++++++
>  2 files changed, 9 insertions(+), 3 deletions(-)
>
> diff --git a/builtin/worktree.c b/builtin/worktree.c
> index 475b958..6b9c946 100644
> --- a/builtin/worktree.c
> +++ b/builtin/worktree.c
> @@ -201,9 +201,7 @@ static int add_worktree(const char *path, const char 
> *refname,
>               die(_("'%s' already exists"), path);
>  
>       /* is 'refname' a branch or commit? */
> -     if (opts->force_new_branch) /* definitely a branch */
> -             ;
> -     else if (!opts->detach && !strbuf_check_branch_ref(&symref, refname) &&
> +     if (!opts->detach && !strbuf_check_branch_ref(&symref, refname) &&
>                ref_exists(symref.buf)) { /* it's a branch */

Makes a reader wonder why the original thought it was OK to do
nothing when -B is given here.

What does symref.buf have at this point in the codeflow?  Will it
always an existing branch?  In what case can it be the name of a
branch that does not yet exist?

Thanks.

>               if (!opts->force)
>                       die_if_checked_out(symref.buf);
> diff --git a/t/t2025-worktree-add.sh b/t/t2025-worktree-add.sh
> index 0a804da..a4d36c0 100755
> --- a/t/t2025-worktree-add.sh
> +++ b/t/t2025-worktree-add.sh
> @@ -193,6 +193,14 @@ test_expect_success '"add" -B/--detach mutually 
> exclusive' '
>       test_must_fail git worktree add -B poodle --detach bamboo master
>  '
>  
> +test_expect_success 'add -B' '
> +     git worktree add -B poodle bamboo2 master^ &&
> +     git -C bamboo2 symbolic-ref HEAD >actual &&
> +     echo refs/heads/poodle >expected &&
> +     test_cmp expected actual &&
> +     test_cmp_rev master^ poodle
> +'
> +
>  test_expect_success 'local clone from linked checkout' '
>       git clone --local here here-clone &&
>       ( cd here-clone && git fsck )
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