Re: [PATCH v3 2/3] builtin/tag.c: add --trailer arg

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

John Passaro <john.a.passaro@gmail.com> writes:

> There's also project-specific trailers. For example, on my team,
> we use "Deploy-Strategy: ..." to tell CICD what deployment routines to run. This
> is pretty specific to us but worth calling out. Maybe could translate to a
> documentation example with something like "<Project-specific-trailer>: foo"

The last one that uses placeholders for both trailer tag and value
may be generic enough.

> However, in service of helping users find workarounds, shouldn't we tell them
> --trailer may be the culprit?
>
>> Failed to read '%s'. Try again without --trailer (use -e or -F to add trailers manually).

I dunno.  

If -m/-F that wrote the original using the open/write_or_die/close
sequence succeeded, the "amend_file" thing successfully spawned
"interpret-trailers --in-place" and got control back, yet we fail
to read that message back, it does not smell like a failure with
that "--trailer" option to me.  A failure with "--trailer" that
could be worked around would have been caught in "amend_file" thing,
before the control reaches this point, no?