mdev.conf setting example for running with linux kernel's IMA/EVM

[趙翊廷]

Thank you for the suggestion using "stat" command  to get Major and Minor
number and can using one rule to do it.

so the setting will be the better one:
[hs]d[a-z]* 0:6 660 *ln -sf /dev/$MDEV /dev/block/$(printf "%d:%d" $(stat
-c "0x%t 0x%T" /dev/$MDEV))

I already tested this setting at my "qemu3.0.0 +busybox-1.29.3 +
linux-kernel-4.14.69" and could create the correct links for the device
nodes.

The attached file is the patch for the "busybox-1.29.3/example/mdev.conf"


Bernhard Reutner-Fischer <rep.dot.nop at gmail.com> 於 2018年10月18日 週四 下午3:47寫道：

> On Wed, 17 Oct 2018 at 11:02, 趙翊廷 <jackend at csie.io> wrote:
>
> > 2. in /etc/mdev.confg we need to add a symbol link something like
> /dev/block/3:0
> >     hd[a-z]* 0:6 660 *ln -sf /dev/$MDEV /dev/block/$(ls -l
> /dev/$MDEV|awk '{print $5}'|tr -d ','):$(ls -l /dev/$MDEV|awk '{print $6}')
> >     sd[a-z]* 0:6 660 *ln -sf /dev/$MDEV /dev/block/$(ls -l
> /dev/$MDEV|awk '{print $5}'|tr -d ','):$(ls -l /dev/$MDEV|awk '{print $6}')
>
> why two rules?
> [hs]d[a-z]*
> and yes, should fix examples/mdev.conf too.
>
> > if $MDEV is hda then will do the following things
> >
> > Get hda's Major=`ls -l /dev/hda | awk '{print $5} | tr -d ',''`
> > Get hda's Minor=`ls -l /dev/$MDEV|awk '{print $6}'`
> > create links: ln -sf /dev/hda /dev/block/$MAJOR:$MINOR
>
> printf "%d:%d" $(stat -c 0x%t\ 0x%T /dev/$MDEV)
>
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