By the way, according to the blkid(8):
-l Look up only one device that matches the search
parameter specified with the -t option. If there are multiple devices
that match the specified search parameter, then the device with
the
highest priority is returned, and/or the first
device found at a given priority...
However, as you can see in my last email, blkid_evaluate_tag() doesn't
seem to return the first device. Only `blkid -lt PARTLABEL="EFI
System" -o device`, which doesn't use the function, output the
"/dev/sda1".
On 10 June 2015 at 14:38, Tom Yan <tom.ty89@xxxxxxxxx> wrote:
> In commit c48508c2, findfs was given ability to work with PARTUUID and
> PARTLABEL. It works on all four types with blkid_evaluate_tag().
>
> When blkid is run in form of `blkid -lt NAME=value -o device` for UUID
> and LABEL, it works the same way as findfs:
>
> /* convert LABEL/UUID lookup to evaluate request */
> if (lookup && output_format == OUTPUT_DEVICE_ONLY && search_type &&
> (!strcmp(search_type, "LABEL") || !strcmp(search_type, "UUID"))) {
> eval++;
> lookup = 0;
> }
>
> but not always for PARTUUID and PARTLABEL.
>
> Would it be a good idea to add them in the test as well, so that
> `findfs` can be considered an equivalence/shortcut as blkid in that
> form?
>
> [tom@localhost ~]$ blkid -t PARTLABEL="EFI System" -o device
> /dev/sda1
> /dev/sdb1
> [tom@localhost ~]$ blkid -t LABEL=TEST -o device
> /dev/sda1
> /dev/sdb1
> [tom@localhost ~]$ blkid -lt PARTLABEL="EFI System" -o device
> /dev/sda1
> [tom@localhost ~]$ findfs PARTLABEL="EFI System"
> /dev/sdb1
> [tom@localhost ~]$ blkid -lt LABEL=TEST -o device
> /dev/sdb1
> [tom@localhost ~]$ findfs LABEL=TEST
> /dev/sdb1
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