minix/etc/rc
Thomas Veerman b47483433c Added a hack to start binaries from the boot image only. In particular, setting
bin_img=1 in the boot monitor will make sure that during the boot procedure the
mfs binary that is part of the boot image is the only binary that is used to
mount partitions. This is useful when for some reason the mfs binary on disk 
malfunctions, rendering Minix unable to boot. By setting bin_img=1, the binary
on disk is ignored and the binary in the boot image is used instead.

- 'service' now accepts an additional flag -r. -r implies -c. -r instructs RS
  to first look in memory if the binary has already been copied to memory and
  execute that version, instead of loading the binary from disk. For example,
  the first time a MFS is being started it is copied (-c) to memory and
  executed from there. The second time MFS is being started this way, RS will
  look in memory for a previously copied MFS binary and reuse it if it exists.
- The mount and newroot commands now accept an additional flag -i, which
  instructs them to set the MS_REUSE flag in the mount flags.
- The mount system call now supports the MS_REUSE flag and invokes 'service'
  with the -r flag when MS_REUSE is set.
- /etc/rc and the rc script that's included in the boot image check for the
  existence of the bin_img flag in the boot monitor, and invoke mount and 
  newroot with the -i flag accordingly.
2009-08-18 11:36:01 +00:00

187 lines
4 KiB
Text
Executable file

# /etc/rc - System startup script run by init before going multiuser.
exec >/dev/log
exec 2>/dev/log
exec </dev/null
umask 022
TERM="${TERM-minix}"
PATH=/usr/local/bin:/bin:/usr/bin:/usr/sbin
RC_TZ=/etc/rc.timezone
export TERM PATH
usage()
{
echo >&2 "Usage: $0 [-saf] start|stop|down"
exec intr sh
}
up()
{
service=$1
shift
# Function to dynamically start a system service
echo -n " $service"
service up /sbin/$service "$@"
}
while getopts 'saf' opt
do
case $opt in
s) sflag=t ;; # Single user
a) aflag=t ;; # Ask for /usr
f) fflag=t ;; # Force a full file system check
*) usage
esac
done
shift `expr $OPTIND - 1`
case "$#:$1" in
1:start|1:stop|1:down)
action=$1
;;
*) usage
esac
case $action in
start)
echo -n "Multiuser startup in progress ...:"
# National keyboard?
test -f /etc/keymap && loadkeys /etc/keymap
up is -period 5HZ
echo .
# Set timezone.
export TZ=GMT0
if [ -f "$RC_TZ" ]
then . "$RC_TZ"
fi
# Try to read the hardware real-time clock, otherwise do it manually.
readclock || intr date -q
# Initialize files.
printroot >/etc/mtab # /etc/mtab keeps track of mounts
>/etc/utmp # /etc/utmp keeps track of logins
# /etc/fstab lists the root, tmp and usr devices.
. /etc/fstab
# Any swapspace on a device?
test "$swap" : '/dev/' && mount -s $swap
# Use MFS binary only from kernel image?
if [ "`sysenv bin_img`" = 1 ]
then
bin_img="-i "
fi
# Are we booting from CD?
bootcd="`/bin/sysenv bootcd`"
# If booting from CD, /usr has to be mounted readonly.
# Also, $usr won't be specified correctly in the
# fstab (the CD could be anywhere), so we decide
# where it is based on sysenv (set by FS when probing for CD).
if [ "$bootcd" = 1 ]
then
#imagedev="`/bin/sysenv cdproberoot`"
#usrdev="`expr $imagedev + 1`"
usr_roflag="-r"
usr="$cddev"p2
echo "Setting /usr on cd is $usr"
fi
# Mount the /usr partition unless this is a single floppy Minix.
if [ ! -d /usr/bin ]
then
if [ "$aflag" -o "$usr" = unknown ]
then
# We need to ask what the /usr du jour is.
intr sh -c '
echo -n "Finish the name of device to mount as /usr: /dev/"
read usr
echo "usr=/dev/$usr" >/tmp/usr'
. /tmp/usr
fi
mount $bin_img $usr_roflag $usr /usr || {
echo "\
Please try to mount something else as /usr, then hit CTRL-D to continue startup.
Mount $usr /usr failed -- Single user."
intr sh
}
rm -f /tmp/usr
fi
# Check if the system crashed.
if shutdown -C
then
echo
echo "The system was not properly shut down. Checking file systems."
fflag=t
fi
if [ "$fflag" ]
then
umount $usr
echo "fsck / - $root"
intr fsck -r $root
echo "fsck /usr - $usr"
intr fsck -r $usr
if [ ! -z "$home" ]
then echo "fsck /home - $home"
intr fsck -r $home
fi
mount $bin_img $usr /usr
fi
if [ ! -z "$home" ]
then mount $bin_img $home /home || echo "WARNING: couldn't mount $home on /home"
fi
# This file is necessary for above 'shutdown -C' check.
# (Silence stderr in case of running from cd.)
touch /usr/adm/wtmp 2>/dev/null
if [ "$sflag" ]
then
echo "Single user."
intr sh
fi
# Any swapspace on a file?
test -n "$swap" -a ! "$swap" : '/dev/' && mount -s $swap
case "`printroot -r`":$bootcd in
/dev/ram:)
# Remove boot-only things to make space,
# unless booting from CD, in which case we need them.
rm -rf /boot
# put the compiler on ram
cp /usr/lib/em* /usr/lib/cpp* /lib
esac
# Things should be alright now.
;;
down|stop)
sync
# Tell RS server we're going down.
service shutdown
;;
esac
# Further initialization.
test -f /usr/etc/rc && sh /usr/etc/rc $action
test -f /usr/local/etc/rc && sh /usr/local/etc/rc $action
#test -f /etc/rc.rescue && sh /etc/rc.rescue $action
# Any messages?
test "$action" = start -a -f /etc/issue && cat /etc/issue
exit 0