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SubjectRe: Universal method to start a script at boot
Date
On Monday 12 September 2005 07:17, Michael Clark wrote:
> >>Is there a standard way to start a script or program at boot that will work
> >>on any Linux kernel/distro no matter which init system is being used or how it
> >>has been configured? Probably not, but I thought someone here could possibly
> >>answer this.
>
> You could use the LSB conforming method of writing and installing
> an init script:
>
> http://refspecs.freestandards.org/LSB_3.0.0/LSB-Core-generic/LSB-Core-generic/iniscrptact.html
> http://refspecs.freestandards.org/LSB_3.0.0/LSB-Core-generic/LSB-Core-generic/iniscrptfunc.html
> http://refspecs.freestandards.org/LSB_3.0.0/LSB-Core-generic/LSB-Core-generic/initscrcomconv.html
> http://refspecs.freestandards.org/LSB_3.0.0/LSB-Core-generic/LSB-Core-generic/initsrcinstrm.html

Awful. This codifies ages-old Unix traditional SysV-like init
and its derivatives, which should be get rid of instead.

daemontools are absolutely wonderful way of controlling daemons.

This is how sane system may look instead:

# ps -AH e
PID TTY STAT TIME COMMAND
1 ? S 0:01 /bin/sh /init
539 ? S< 0:00 udevd UDEV_LOG=debug
593 ? S 0:00 rpc.portmap
702 ? S 0:00 svscan /var/service PATH=/bin:/usr/bin
720 ? S 0:00 supervise fw PATH=/bin:/usr/bin
721 ? S 0:00 supervise gpm PATH=/bin:/usr/bin
1597 ? S 0:00 gpm -D -2 -m /dev/psaux -t ps2
722 ? S 0:00 supervise nfs PATH=/bin:/usr/bin
743 ? S 0:00 /bin/sh ./run PATH=/bin:/usr/bin
1097 ? S 0:00 sleep 32000
723 ? S 0:00 supervise ntp PATH=/bin:/usr/bin
736 ? SL 0:00 ntpd -D 0 -c conf -f drift -s stat -l /proc/self/fd/2 -p /dev/null -k /dev/null -g -d -n
724 ? S 0:00 supervise log PATH=/bin:/usr/bin
737 ? S 0:00 multilog t /var/log/service/ntp
725 ? S 0:00 supervise smb PATH=/bin:/usr/bin
726 ? S 0:00 supervise log PATH=/bin:/usr/bin
730 ? S 0:00 multilog t /var/log/service/smb
727 ? S 0:00 supervise top PATH=/bin:/usr/bin
760 ? S 1:00 top c s TERM=linux
728 ? S 0:00 supervise dhcp PATH=/bin:/usr/bin
729 ? S 0:00 supervise log PATH=/bin:/usr/bin
755 ? S 0:00 multilog t /var/log/service/dhcp
744 ? S 0:00 supervise klog PATH=/bin:/usr/bin
784 ? S 0:00 socklog ucspi
745 ? S 0:00 supervise log PATH=/bin:/usr/bin
780 ? S 0:00 svlogd -tt /var/log/service/klog
746 ? S 0:00 supervise once PATH=/bin:/usr/bin
747 ? S 0:00 supervise sshd PATH=/bin:/usr/bin
748 ? S 0:00 /usr/bin/sshd -D -e -p22 -u0
775 ? S 0:00 supervise r_zebra PATH=/bin:/usr/bin
776 ? S 0:00 supervise log PATH=/bin:/usr/bin
797 ? S 0:00 multilog t /var/log/service/r_zebra
777 ? S 0:00 supervise httpd PATH=/bin:/usr/bin
792 ? S 0:00 tcpserver -v -R -H -l 0 -c 40 0.0.0.0 www setuidgid root httpd -X -f /.local/var/service/httpd/httpd.conf
778 ? S 0:00 supervise log PATH=/bin:/usr/bin
788 ? S 0:00 multilog t /var/log/service/httpd
786 ? S 0:00 supervise pgsql PATH=/bin:/usr/bin
787 ? S 0:00 supervise log PATH=/bin:/usr/bin
832 ? S 0:00 multilog t /var/log/service/pgsql
815 ? S 0:00 supervise smb_s PATH=/bin:/usr/bin
816 ? S 0:00 supervise log PATH=/bin:/usr/bin
840 ? S 0:00 multilog t /var/log/service/smb_s
817 ? S 0:00 supervise nfs_mountd PATH=/bin:/usr/bin
846 ? S 0:00 rpc.mountd --foreground --debug all
827 ? S 0:00 supervise log PATH=/bin:/usr/bin
857 ? S 0:00 multilog t /var/log/service/nfs_mountd
828 ? S 0:00 supervise getty_ttyM0 PATH=/bin:/usr/bin
829 ? S 0:00 supervise getty_ttyS0 PATH=/bin:/usr/bin
830 ? S 0:00 supervise nmeter PATH=/bin:/usr/bin
1011 ? S 0:00 nmeter t c i x p b nif
881 ? S 0:00 supervise ovpn-1 PATH=/bin:/usr/bin
882 ? S 0:00 supervise log PATH=/bin:/usr/bin
954 ? S 0:00 multilog /var/log/service/ovpn-1
884 ? S 0:00 supervise r_ospf PATH=/bin:/usr/bin
885 ? S 0:00 supervise log PATH=/bin:/usr/bin
886 ? S 0:00 multilog /var/log/service/r_ospf
889 ? S 0:00 supervise getty_tty1 PATH=/bin:/usr/bin
890 ? S 0:00 supervise getty_tty2 PATH=/bin:/usr/bin
970 ? S 0:00 login -- vda
1676 tty2 S 0:00 -bash HOME=/home/vda PATH=/sbin:/bin:/usr/sbin:/usr/bin SHELL=/bin/bash TERM=linux MAIL=/var/mail/vda LOGNAME=vda
891 ? S 0:00 supervise getty_tty3 PATH=/bin:/usr/bin
975 tty3 S 0:00 agetty 38400 /dev/tty3 linux TERM=linux
892 ? S 0:00 supervise getty_tty4 PATH=/bin:/usr/bin
969 tty4 S 0:00 agetty 38400 /dev/tty4 linux TERM=linux
893 ? S 0:00 supervise getty_tty5 PATH=/bin:/usr/bin
964 tty5 S 0:00 agetty 38400 /dev/tty5 linux TERM=linux
894 ? S 0:00 supervise getty_tty6 PATH=/bin:/usr/bin
960 tty6 S 0:00 agetty 38400 /dev/tty6 linux TERM=linux
895 ? S 0:00 supervise getty_tty7 PATH=/bin:/usr/bin
912 tty7 S 0:00 agetty 38400 /dev/tty7 linux TERM=linux
896 ? S 0:00 supervise getty_tty8 PATH=/bin:/usr/bin
915 tty8 S 0:00 agetty 38400 /dev/tty8 linux TERM=linux
897 ? S 0:00 supervise syslog PATH=/bin:/usr/bin
898 ? S 0:00 socklog unix /dev/log PATH=/bin:/usr/bin PWD=/.local/var/service/syslog SHLVL=0 GID=50 UID=58
899 ? S 0:00 supervise log PATH=/bin:/usr/bin
903 ? S 0:00 svlogd /var/log/service/syslog
900 ? S 0:00 supervise nfs_statd PATH=/bin:/usr/bin
934 ? S 0:00 rpc.statd -F -d
910 ? S 0:00 supervise log PATH=/bin:/usr/bin
911 ? S 0:00 multilog t /var/log/service/nfs_statd
924 ? S 0:00 supervise automount PATH=/bin:/usr/bin
951 ? S 0:00 automount -f -s -v -d --timeout 15 /.local/mnt/auto program /root/bin/mapper.sh
925 ? S 0:00 supervise log PATH=/bin:/usr/bin
926 ? S 0:02 multilog t n5 /var/log/service/automount
928 ? S 0:00 supervise watcher PATH=/bin:/usr/bin
929 ? S 0:00 supervise udhcpd_eth0 PATH=/bin:/usr/bin
719 ? S 0:00 sleep 32000

And /init is:

#!/bin/sh

# Clean up env
unset HOSTNAME
unset devfs
unset MACHTYPE
unset SHLVL
unset SHELL
unset HOSTTYPE
unset OSTYPE
unset HOME
unset TERM
PATH=/bin:/usr/bin

exec >/dev/console
exec 2>&1
exec </dev/null
env - PATH="$PATH" /etc/some_startup_script_which_also_starts_svscan

# Close all descriptors
exec >&-
exec 2>&-
exec <&-
while true; do env - sleep 32000; done
--
vda
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