crypttab precheck & tmp options not working on 16.04

[Tom H]

On Mon, May 9, 2016 at 3:08 PM, Adam Funk <a24061 at ducksburg.com> wrote:
>
> I did a successful clean installation of 16.04 & left a few partitions
> free for encrypted swap and /tmp. Swap is working fine, but this line
> in /etc/crypttab
>
> etmp  /dev/disk/by-id/blah-blah-part6  /dev/urandom  precheck=/bin/true,tmp=ext4
>
> is throwing these errors at boot
>
> systemd-cryptsetup ... Encountered unknown /etc/crypttab option 'precheck=/bin/true', ignoring.
> systemd-cryptsetup ... Encountered unknown /etc/crypttab option 'tmp=ext4', ignoring.
>
> so /dev/mapper/etmp doesn't get set up & the boot fails. Both of
> these options are listed in 'man crypttab' --- what's wrong?

>From https://github.com/systemd/systemd/blob/master/src/cryptsetup/cryptsetup.c#L60
:

/* Options Debian's crypttab knows we don't:
    precheck=
    check=
    checkargs=
    noearly=
    loud=
    keyscript=
*/

'man crypttab' is probably the man page provided by Ubuntu's cryptsetup package.

The systemd crypttab man page is:

https://www.freedesktop.org/software/systemd/man/crypttab.html