[dm-crypt] persistent naming: add ID in addition to UUID

Sven Eschenberg sven at whgl.uni-frankfurt.de
Mon Jul 27 23:53:53 CEST 2015

On Mon, July 27, 2015 21:49, Milan Broz wrote:
> On 07/27/2015 09:26 PM, ilf wrote:
>> Sven Eschenberg:
>>> Since you want to use crypttab anyway, is there any particular reason
>>> not
>>> to use /dev/disk/by-id/<identifier>?
>> You are comlpetely right, that works and I should probably use that.
>>> As UUID=<uuid> needs proper symlinks anyway, it is rather a handy
>>> shorthand at the commandline.
>> Well, the man-page for crypttab(5) in Debian and Derivatives sais, "the
>> UUID is supported as well, using UUID=<luks_uuid>". So adding an ID=
>> option would make this more consistent.
> Actually I added UUID=<..> to cryptsetup to mainly easily implement
> scripts doing the similar action as fstab/crypttab UUID= mount.
> (fstab allows LABEL and UUID but not ID; also LUKS has no label)

Sorry to correct you here, but fstab supports all libblkid properties,
which are amongst UUID and LABEL some more (PARTLABEL and PARTUUID for GPT
work quite well ;-) ). And even UUID and LABEL need libblkid support,
otherwise they won't work in fstab.

> Milan
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