Trying to halt a root process from a desktop icon

AlanSecker · 07-11-2013, 05:19 AM

I am trying to turn off the mythtv backend,
run kaffeine and then turn it back on again.
Just a three line script.

I assume that this is possible but that I am going about it in my usual A about F fashion.

I have changed the script settings from regular user to root etc but nothing works.

Each line of the script has been tested from a root terminal, so there is something fundamental that I am missing.

Of course I do not want a password request every time it is run either.

Firerat · 07-11-2013, 06:33 AM

Yes,

the way I see it you need to change line 2 from

Code:

to

Code:

This might solve it

AlanSecker · 07-11-2013, 10:32 AM

Forgive me but was that meant to represent a serious answer, a time waste, evidence of a psychological disorder or an attempt to introduce disarray into a serious forum?

Firerat · 07-11-2013, 10:41 AM

None of the above.

The intention was for you to see that what you were missing was posting your 3 line script.
So that we might see what the real problem is.

Good Luck.

szboardstretcher · 07-11-2013, 10:49 AM

In other words: Please post the script in question.

AlanSecker · 07-11-2013, 02:45 PM

OK but I assumed the principles would remain the same regardless.

Here is the script:

#!/bin/bash
#
# Script: kaffstart
#
# Purpose: Start script to ensure that the MythTV backend is OFF so that
# kaffeine can access the TV tuners and to start kasffeine.
# Also to restore MythTV backend when it terminates.
#

/etc/init.d/mythbackend stop

/usr/bin/kaffeine

/etc/init.d/mythbackend start

Firerat · 07-12-2013, 10:39 AM

Quote:

Originally Posted by AlanSecker

OK but I assumed the principles would remain the same regardless.

Here is the script:

assuming you have sudo installed

Code:

#!/bin/bash
#
# Script:  kaffstart
#
# Purpose: Start script to ensure that the MythTV  backend is OFF so that 
# kaffeine can access the TV tuners and to start kasffeine.
# Also to restore MythTV backend when it terminates.
#

sudo /etc/init.d/mythbackend stop
  
/usr/bin/kaffeine

sudo /etc/init.d/mythbackend start

and then edit your sudoers file ( important to use visudo )

as root

Code:

visudo

assuming your username is alan, add the 'alan' line

Code:

# User privilege specification
root    ALL=(ALL:ALL) ALL
alan    ALL=(root:root) NOPASSWD: /etc/init.d/mythbackend

via sudo alan will be able to run /etc/init.d/mythbackend as root, without the need for password.

Code:

chown alan:alan /path/to/YourScript.sh
chmod 0700 /path/to/YourScript.sh

and point your desktop link at that script like it was a command.

choronozon · 07-15-2013, 08:27 PM

Quote:

Originally Posted by Firerat

assuming you have sudo installed

Code:

#!/bin/bash
#
# Script:  kaffstart
#
# Purpose: Start script to ensure that the MythTV  backend is OFF so that 
# kaffeine can access the TV tuners and to start kasffeine.
# Also to restore MythTV backend when it terminates.
#

sudo /etc/init.d/mythbackend stop
  
/usr/bin/kaffeine

sudo /etc/init.d/mythbackend start

and then edit your sudoers file ( important to use visudo )

as root

Code:

visudo

assuming your username is alan, add the 'alan' line

Code:

# User privilege specification
root    ALL=(ALL:ALL) ALL
alan    ALL=(root:root) NOPASSWD: /etc/init.d/mythbackend

via sudo alan will be able to run /etc/init.d/mythbackend as root, without the need for password.

Code:

chown alan:alan /path/to/YourScript.sh
chmod 0700 /path/to/YourScript.sh

and point your desktop link at that script like it was a command.

I wish I'd thought of that before I wrote a C program to su itself to root, and execute my script...

AlanSecker · 07-18-2013, 12:16 PM

I was delighted to receive that solution and it certainly made sense and taught me something about the sudoers file. I had some other issues to clear up before I could test it but so far it has not worked.

Firerat · 07-18-2013, 01:38 PM

Sorry, this was my fault
in the sudoers file, the last rule wins

you probably have a rule for the group sudo

Code:

%sudo   ALL=(ALL:ALL) ALL

so if you are a member of sudo group, the old rule was 'over written'

put your rule below that ( and any others that would overrule ) , and it should work