Re: Mystery empty file

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On Thu, 2019-06-06 at 11:15 -0600, Chris Murphy wrote:
> On Thu, Jun 6, 2019 at 9:49 AM Richard Ryniker <ryniker@xxxxxxxxxxxx> wrote:
> > I think you will find the file is not truly empty.  /sys is not an actual
> > file system, merely an interface to kernel information.  There is no
> > directory structure that records the length or other attributes of a file,
> > as is the case for data on real media such as disks.
> > 
> > If you read the /sys/kernel/debug/usb/devices file, you should find the
> > data you seek.
> 
> [root@fmac ~]# ls -l /sys/kernel/debug/usb/devices
> -r--r--r--. 1 root root 0 Jun  6 10:11 /sys/kernel/debug/usb/devices
> [root@fmac ~]# cat /sys/kernel/debug/usb/devices
> cat: /sys/kernel/debug/usb/devices: Operation not permitted
> [root@fmac ~]#
> 
> 5.2.0-0.rc3.git1.1.fc31.x86_64

Try it with enforcing=0 ?
-- 
Adam Williamson
Fedora QA Community Monkey
IRC: adamw | Twitter: AdamW_Fedora | XMPP: adamw AT happyassassin . net
http://www.happyassassin.net
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