[mythtv] unprivileged user?

Matt Zimmerman mdz at debian.org
Wed Aug 13 00:22:45 EDT 2003

On Tue, Aug 12, 2003 at 06:44:21PM -0700, Gregorio Gervasio, Jr. wrote:

> >>>>> Matt Zimmerman writes:
> m> There is no reason whatsoever to run any part of mythtv as root in the first
> m> place (the debs don't), so I don't think it's necessary to have myth itself
> m> try to switch to another user.  Just start it as the user that you want to
> m> run it as.
>         I think there's code in NuppelVideo* that tries to renice to a
> high priority so that will only work if it's running as root.  I
> haven't noticed if that really makes a difference though.

In the experimental sync code, yes (I don't know why).  Anyway, it ignores
any error return, so it continues happily on even if you enable that as

>         Slightly related -- shouldn't disk free space be calculated
> using f_bavail rather than f_bfree since mythbackend doesn't have to
> run as root?  It'll make a difference for people who forgot to change
> from the 5% default reserved space on their giant partitions.  It
> should head off some questions ("Why did my disk fill up even with
> auto-expire?  Why does MythTV think there is more space than is
> reported by df?").
> ./programs/mythbackend/encoderlink.cpp:175:            freeSpace = statbuf.f_bfree / (1024*1024/statbuf.f_bsize);
> ./programs/mythbackend/encoderlink.cpp:194:                freeSpace = statbuf.f_bfree / (1024*1024/statbuf.f_bsize);
> ./programs/mythbackend/mainserver.cpp:897:        usedspace = (statbuf.f_blocks - statbuf.f_bfree) / 
> ./programs/mythbackend/autoexpire.cpp:60:            freespace = statbuf.f_bfree / (1024*1024*1024/statbuf.f_bsize);
> ./programs/mythbackend/autoexpire.cpp:98:                        statbuf.f_bfree / (1024*1024*1024/statbuf.f_bsize);

Hmm, maybe it should.  I never came across this issue because I don't use
ext2 for my mythtv data.  I believe the HOWTO also recommends that users
create the filesystem without any reserved space when dedicating a
filesystem to mythtv.

 - mdz

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