[mythtv-users] Permissions and HD3000 QAM_256 setup

[Mark Johannessen]

This is probably a basic persmissions question.  I am now working on
getting a channel lineup for an HD3000 card.  Per the
Adding_QAM_Channels_For_HDTV_Tuner_Cards wiki:

$ ./atscscan atsc/us-Cable-Standard-center-frequencies-QAM256
scanning atsc/us-Cable-Standard-center-frequencies-QAM256
using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
main:2232: FATAL: failed to open '/dev/dvb/adapter0/frontend0': 13
Permission denied

However, when I run atscscan as root, I can get a channel listing that
I then put in a file /home/mythtv/.azap/channels.conf such as ....

# ./atscscan atsc/us-Cable-Standard-center-frequencies-QAM256
....
[0007]:573000000:QAM_256:1031:1639:7
[0006]:573000000:QAM_256:1026:1027:6
[0005]:573000000:QAM_256:1021:1022:5
[0001]:573000000:QAM_256:1001:1002:1
....

Now I try to get a channel lock by ...

$ /usr/local/bin/azap -r [0007]
using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
ERROR: failed opening '/dev/dvb/adapter0/frontend0' (Permission denied)

I try this as root:
# /usr/local/bin/azap -r [0007]
using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
ERROR: could not open file '/root/.azap/channels.conf' (No such file
or directory)
No such file or directory

I then checked permissions:

$ ls -la -R /dev/dvb
/dev/dvb:
total 0
?---------  ? ? ? ?           ? .
?---------  ? ? ? ?           ? ..
?---------  ? ? ? ?           ? adapter0
ls: /dev/dvb/adapter0: Permission denied

and ...

# ls -la -R /dev/dvb
/dev/dvb:
total 0
drw-rw-rw-   3 root mythtv   60 Mar 27 10:55 .
drwxr-xr-x  13 root root   4320 Mar 27 10:55 ..
drw-rw-rw-   2 root mythtv  120 Mar 27 10:55 adapter0

/dev/dvb/adapter0:
total 0
drw-rw-rw-  2 root mythtv    120 Mar 27 10:55 .
drw-rw-rw-  3 root mythtv     60 Mar 27 10:55 ..
crw-rw-rw-  1 root mythtv 212, 4 Mar 27 10:55 demux0
crw-rw-rw-  1 root mythtv 212, 5 Mar 27 10:55 dvr0
crw-rw-rw-  1 root mythtv 212, 3 Mar 27 10:55 frontend0
crw-------  1 root root   212, 7 Mar 27 10:55 net0

In order to get the above permissions to stick on reboot, I added the
following to /etc/rc.d/rc.local:

chmod -R 666 /dev/dvb
chgrp -R mythtv /dev/dvb

The basic question is, should azap, atscscan, etc be run as root or
should I be working as the mythtv user?

Mark