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init.sh
executable file
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init.sh
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#!/bin/hush
# Announce version
sed -n 's/PRETTY_NAME="\([^"]*\)"/\1/p' /etc/os-release
export HOME=/home
export PATH=/bin:/sbin
# Mount filesystems
mountpoint -q proc || mount -t proc proc proc
mountpoint -q sys || mount -t sysfs sys sys
mountpoint -q dev || mount -t devtmpfs dev dev || mdev -s
mkdir -p dev/pts
mountpoint -q dev/pts || mount -t devpts dev/pts dev/pts
# /tmp inherited from initmpfs
# If nobody said how many CPUS to use in builds, try to figure it out.
if [ -z "$CPUS" ]
then
export CPUS=$(echo /sys/devices/system/cpu/cpu[0-9]* | wc -w)
[ "$CPUS" -lt 1 ] && CPUS=1
fi
export PS1="($HOST:$CPUS) \w \$ "
# When running under qemu, do some more setup
if [ $$ -eq 1 ]
then
# Note that 10.0.2.2 forwards to 127.0.0.1 on the host.
# Setup networking for QEMU (needs /proc)
ifconfig eth0 10.0.2.15
route add default gw 10.0.2.2
# If we have no RTC, try rdate instead:
[ "$(date +%s)" -lt 1000 ] && rdate 10.0.2.2 # or time-b.nist.gov
# mount hda on /usr/overlay, hdb on /home, and hdc on /mnt, if available
[ -b /dev/[hsv]da ] &&
mkdir -p /usr/overlay && mount /dev/[hsv]da /usr/overlay
[ -b /dev/[hsv]db ] && mount -o noatime /dev/[hsv]db /home && cd /home
[ -b /dev/[hsv]dc ] && mount -o ro /dev/[hsv]dc /mnt
[ -z "$CONSOLE" ] &&
CONSOLE="$(sed -n 's@.* console=\(/dev/\)*\([^ ]*\).*@\2@p' /proc/cmdline)"
# Call overlay/init if available
[ -e /usr/overlay/init ] && . /usr/overlay/init
[ -z "$HANDOFF" ] && echo Type exit when done. && HANDOFF=/bin/hush
[ -z "$CONSOLE" ] && CONSOLE=console
exec /sbin/oneit -c /dev/"$CONSOLE" "$HANDOFF"
# If we're not PID 1, it's probably a chroot.
else
[ ! -z "$(grep "default for QEMU" /etc/resolv.conf)" ] &&
echo "nameserver 8.8.8.8" > /etc/resolv.conf
# If we have no RTC, try using ntp to set the clock
[ "$(date +%s)" -lt 10000000 ] && ntpd -nq -p north-america.pool.ntp.org
# Switch to a shell with command history.
echo Type exit when done.
/bin/hush
cd /
umount ./dev/pts
umount ./dev
umount ./sys
umount ./proc
sync
fi