I think something along those lines would work.  I'd suggest using the term
"delimiter" like the other error message, e.g.: "empty component or
misplaced '@' or '#' delimiter".

--matt

On Mon, Jan 28, 2019 at 2:20 AM Damian Wojslaw <[email protected]> wrote:

> I'm looking at tissue 8155:
>
> https://github.com/zfsonlinux/zfs/issues/8155
> zfs create - error message for @ or # in name improvement
>
> The issue raised is that if dataset name starts with @ or # zfs create
> returns error message "empty component in name" while the same characters
> in the middle of dataset name return "delimiter not expected here" error
> message.
>
> I was wondering if simply expanding the original message to read "empty
> component or illegal character in name" would be sufficient. It's the least
> cost way to implement it.
>
> The check happens in
> https://github.com/zfsonlinux/zfs/blob/master/module/zcommon/zfs_namecheck.c
> in entity_namecheck().
>
> With zfs create tank/@test the check falls through to check in line 248:
> /* Zero-length components are not allowed */
>
> if (start == end) {
>
> if (why)
>
> *why = NAME_ERR_EMPTY_COMPONENT;
>
> return (-1);
>
> }
>
>
> and this is the error returned to calling function zfs_validate_name() in
> libzfs_dataset.c
>
> At the same time I think reworking the check so that both zfs create
> tank/te@st and tank/@test would be caught by the same if in
> zfs_validate_name().
>
> What are your thought?
>
>
> Regards
>
> Damian Wojsław
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