Ronnie Sahlberg wrote:
> Update ref_transaction_update() do some basic error checking and return
> non-zero on error. Update all callers to check ref_transaction_update() for
> error. There are currently no conditions in _update that will return error but
> there will be in the future.
Probably worth passing a 'struct strbuf *err' argument. Then callers
can do
die("%s", err.buf);
and the error message can say which ref and whether we were trying to
create a ref, or delete one, or whatever.
> --- a/builtin/update-ref.c
> +++ b/builtin/update-ref.c
> @@ -197,8 +197,9 @@ static const char *parse_cmd_update(struct strbuf *input, const char *next)
> if (*next != line_termination)
> die("update %s: extra input: %s", refname, next);
>
> - ref_transaction_update(transaction, refname, new_sha1, old_sha1,
> - update_flags, have_old);
> + if (ref_transaction_update(transaction, refname, new_sha1, old_sha1,
> + update_flags, have_old))
> + die("update %s: failed", refname);
This could say
die("update %s: %s", refname, err.buf);
to give context about which command it was trying to execute.
[...]
> @@ -286,8 +287,9 @@ static const char *parse_cmd_verify(struct strbuf *input, const char *next)
> if (*next != line_termination)
> die("verify %s: extra input: %s", refname, next);
>
> - ref_transaction_update(transaction, refname, new_sha1, old_sha1,
> - update_flags, have_old);
> + if (ref_transaction_update(transaction, refname, new_sha1, old_sha1,
> + update_flags, have_old))
> + die("failed transaction update for %s", refname);
And this could say
die("verify %s: %s", refname, err.buf);
[...]
> --- a/refs.h
> +++ b/refs.h
> @@ -242,12 +242,15 @@ void ref_transaction_rollback(struct ref_transaction *transaction);
> * be deleted. If have_old is true, then old_sha1 holds the value
> * that the reference should have had before the update, or zeros if
> * it must not have existed beforehand.
> + * Function returns 0 on success and non-zero on failure. A failure to update
> + * means that the transaction as a whole has failed and will need to be
> + * rolled back.
> + */
Thanks for this documentation.
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