Runvdr

Version vom 22. Februar 2005, 09:52 Uhr

Runvdr aus den VDR Sourcen

#!/bin/sh

# runvdr: Loads the DVB driver and runs VDR
#
# If VDR exits abnormally, the driver will be reloaded
# and VDR restarted.
#
# Set the environment variable VDRUSR to the user id you
# want VDR to run with. If VDRUSR is not set, VDR will run
# as 'root', which is not necessarily advisable.
#
# Since this script loads the DVB driver, it must be started
# as user 'root'.
#
# Any command line parameters will be passed on to the
# actual 'vdr' program.
#
# See the main source file 'vdr.c' for copyright information and
# how to reach the author.
#
# $Id: runvdr 1.14 2004/11/21 11:30:00 kls Exp $

DVBDIR="../DVB/driver"
VDRPRG="./vdr"
VDRCMD="$VDRPRG -w 60 $*"

LSMOD="`/sbin/lsmod | grep -w '^dvb' | wc -l`"
KILL="/usr/bin/killall -q -TERM"

# Load driver if it hasn't been loaded already:
if [ $LSMOD -eq 0 ] ; then
   (cd $DVBDIR; make insmod)
   fi

while (true) do
      su $VDRUSR -p -c "$VDRCMD"
      if test $? -eq 0 -o $? -eq 2; then exit; fi
      date
      echo "restarting VDR"
      $KILL $VDRPRG
      sleep 10
      (cd $DVBDIR; make rmmod; make insmod)
      date
      done

Tipps

Programme und libs werden nach dem ausführen der runvdr nicht gefunden?

Die Lösung ist ziehmlich einfach, die Orginal runvdr (siehe oben) setzt die Environment auf Null.

while (true) do
      su $VDRUSR -c "$VDRCMD"
      ^^^^^^^^^^^^^^^^^^^^^^^
      if test $? -eq 0 -o $? -eq 2; then exit; fi

Im Detail.

bash> echo $PATH
/sbin:/usr/sbin:/usr/local/sbin:/root/bin:/usr/local/bin:/usr/bin:/usr/X11R6/bin:/bin:/usr/games:/opt/gnome/bin:/opt/kde3/bin:/usr/lib/java/jre/bin

bash> su
bash> echo $PATH
/usr/sbin:/bin:/usr/bin:/sbin:/usr/X11R6/bin

bash> su --help
Usage: su [OPTION]... [-] [USER [ARG]...]
Change the effective user id and group id to that of USER.

  -, -l, --login               make the shell a login shell
                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  -c, --commmand=COMMAND       pass a single COMMAND to the shell with -c
  -f, --fast                   pass -f to the shell (for csh or tcsh)
  -m, --preserve-environment   do not reset environment variables
                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  -p                           same as -m
                               ^^^^^^^^^^
  -s, --shell=SHELL            run SHELL if /etc/shells allows it
      --help     display this help and exit
      --version  output version information and exit

A mere - implies -l.   If USER not given, assume root.

Report bugs to <bug-coreutils@gnu.org>.

Man braucht su lediglich mitzuteilen, die Environment nicht zu löschen, das wäre in der runvdr, eines folgender Möglichkeiten.

su - $VDRUSR -c "$VDRCMD"
su $VDRUSR -m -c "$VDRCMD"
su $VDRUSR -p -c "$VDRCMD"

Startest Du das ganze als "root", ist sh die bessere Wahl.

sh -c "$VDRCMD"

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