Ronnie Sahlberg wrote:

> --- a/builtin/tag.c
> +++ b/builtin/tag.c
> @@ -701,11 +702,12 @@ int cmd_tag(int argc, const char **argv, const char 
> *prefix)
>       if (annotate)
>               create_tag(object, tag, &buf, &opt, prev, object);
>  
> -     lock = lock_any_ref_for_update(ref.buf, prev, 0, NULL);
> -     if (!lock)
> -             die(_("%s: cannot lock the ref"), ref.buf);
> -     if (write_ref_sha1(lock, object, NULL) < 0)
> -             die(_("%s: cannot update the ref"), ref.buf);
> +     transaction = ref_transaction_begin();
> +     if (!transaction ||
> +         ref_transaction_update(transaction, ref.buf, object, prev,
> +                                0, !is_null_sha1(prev)) ||
> +         ref_transaction_commit(transaction, NULL, &err))
> +             die(_("%s: cannot update the ref: %s"), ref.buf, err.buf);

The error string says what ref it was trying to update, so

                die("%s", err.buf);

should be enough.  (E.g.,

        fatal: refs/tags/v1.0: cannot lock the ref

would become

        fatal: Cannot lock the ref 'refs/tags/v1.0'.

instead of

        fatal: refs/tags/v1.0: cannot update the ref: Cannot lock the ref 
'refs/tags/v1.0'.

.)

Thanks,
Jonathan
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