Re: [PATCH] worktree add: improve message for ambiguous remote branch name

[Junio C Hamano <gitster@pobox.com>]

Yoichi Nakayama <yoichi.nakayama@gmail.com> writes:

> Before the change, it calles lookup_commit_reference_by_name() again
> in the if condition and die() at:
>
>     if (!opts.orphan && !lookup_commit_reference_by_name(branch)) {
>         /* snip */
>         die(_("invalid reference: %s"), branch);
>     }
>
> The motivation for the fix was that this error message did not
> accurately reflect the situation.

The location of this die() is a tad away from the places that the
patch touched.  The proposed log message could be made a bit more
helpful by mentioning it.  What was posted reads:

    Display a descriptive message when DWIM fails.

    Add advice on how to work around this by specifying the fully
    qualified name or by setting checkout.defaultRemote.

but telling the readers what they will see instead of a descriptive
message and how that happens would be very helpful to understand why
it is a good idea to die early.  Perhaps

    When the user runs 'git worktree add x y z' command that does
    not exactly say which remote they want to work with, we try to
    guess which remote by passing y.  If there are multiple remotes
    that have branch named y, we silently gave up, leaving remote
    still NULL.  This later causes A and B not happen, and we end up
    with passing an non-existing branch to
    lookup_commit_reference_by_name(), triggering "invalid
    reference" error and die.

or something like that that describes the issue to a similar degree
as above mock-up message.

Thanks.