[mythtv-users] mythfilldatabase autorun config file location error
Michael T. Dean
mtdean at thirdcontact.com
Wed Oct 18 01:53:18 UTC 2006
On 10/17/06 17:12, R. G. Newbury wrote:
>Michael T. Dean wrote:
>>On 10/17/06 09:56, Daniel Kristjansson wrote:
>>>On Sat, 2006-10-14 at 16:26 +0100, Neil Sedger wrote:
>>>>Michael T. Dean wrote:
>>>>>Because the environment from which this is being run doesn't have a HOME
>>>>>environment variable defined.
>>>>Indeed. How odd. I thought that Fedora initscripts would automatically pick up the user's (root) environment. A quick test shows it doesn't even have $USER!
>>>>I've edited the initscript to hardcode the HOME var as you suggested, thanks.
>>>>I'd have thought this problem would happen to more people though, I haven't seen it mentioned in the docs, install guide or FAQ.
>>>I would think very few people run mythfilldatabase as root..
>>>Too many people do something crazy like run mythbackend or mythfrontend
>>>as root, but I've never seen anyone recommend running mythfilldatabase
>>Of course, if running (the master) mythbackend as root and if MythTV is
>>set to automatically run mythfilldatabase, mythfilldatabase is run as
>>The most common reason to be lacking a HOME environment variable is
>>because an init script (which is not executed under a login shell)
>>starts mythbackend and doesn't go to the trouble of setting up the
>Verrrryyy interesting. Firstly, I always run mythfilldatabase as root
>and it runs fine!
>Under Fedora, at least, the $HOME variable is taken from the /etc/passwd
>file, and set by 'login' on logging in.
But, only when "logging in".
>I would think that the only way to get running without a $HOME
>environment variable set would be to bypass login somehow.
Right, like by having an init script--which is not executed under a
login shell--start mythbackend. TTBOMK, this is what the FC start
>If that works I suspect that chown and chgrp of mythfilldatabase may be
>sufficient to avoid the problem referred to above.
chown and chgrp won't do anything. Even chmod to set it setuid mythtv
won't do anything. You just need a HOME environment variable (which you
can set in the init script or by executing mythbackend/mythfilldatabase
from within a login shell).
>Although I still do not understand why 'running mythfilldatabase root is
>not a good idea'.
>This is a myth.
If you run a program as user mythtv, and it has a
bug/exploit/failure/whatever, it can destroy the mythtv user's data. If
you run a program as user root, and it has a
bug/exploit/failure/whatever, it can destroy the entire system (or even
do other more nefarious deeds). That is not a myth--I'd be happy to
provide you an example program if you'd like to test it. :D (I think
I'd call the program,
Or, come to think of it, there's a commonly available example program by
the name of Windows...
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