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|
#!/bin/sh
################################################################################
#
# Init script to boot over network through NBD
#
# Contact: Stéphane Desneux <stephane.desneux@iot.bzh>
#
################################################################################
# banner generator: echo "AGL - Netboot" | figlet -f slant -w 80 -c
cat <<'EOF' >&2
________________________________________________________________________________
___ ________ _ __ __ __ __
/ | / ____/ / / | / /__ / /_/ /_ ____ ____ / /_
/ /| |/ / __/ / ______ / |/ / _ \/ __/ __ \/ __ \/ __ \/ __/
/ ___ / /_/ / /___ /_____/ / /| / __/ /_/ /_/ / /_/ / /_/ / /_
/_/ |_\____/_____/ /_/ |_/\___/\__/_.___/\____/\____/\__/
________________________________________________________________________________
EOF
# global variables
SMACK=n
NBD_SERVER=
NBD_PORT=10809
NBD_DEV=/dev/nbd0
DEBUG=n
# -------------------------------------------
log_info() { echo "$0[$$]: $@" >&2; }
log_error() { echo "$0[$$]: ERROR $@" >&2; }
do_mount_fs() {
log_info "mounting FS: $@"
[[ -e /proc/filesystems ]] && { grep -q "$1" /proc/filesystems || { log_error "Unknown filesystem"; return 1; } }
[[ -d "$2" ]] || mkdir -p "$2"
[[ -e /proc/mounts ]] && { grep -q -e "^$1 $2 $1" /proc/mounts && { log_info "$2 ($1) already mounted"; return 0; } }
mount -t "$1" "$1" "$2"
}
bail_out() {
log_error "$@"
check_debug "Reboot will occur after exiting this shell."
log_info "Rebooting..."
exec reboot -f
}
check_debug() {
case $DEBUG in
Y|y|yes|1|true)
log_info "$@"
/bin/sh -i
;;
esac
}
# -------------------------------------------
export PATH=/sbin:/usr/sbin:/bin:/usr/bin
log_info "starting initrd script"
do_mount_fs proc /proc
do_mount_fs sysfs /sys
do_mount_fs devtmpfs /dev
do_mount_fs devpts /dev/pts
do_mount_fs tmpfs /dev/shm
do_mount_fs tmpfs /tmp
do_mount_fs tmpfs /run
# parse kernel commandline to get NBD server
for x in $(cat /proc/cmdline); do
case $x in
nbd.server=*) NBD_SERVER=${x/*=/};;
nbd.port=*) NBD_PORT=${x/*=/};;
nbd.dev=*) NBD_DEV=/dev/${x/*=/};;
nbd.debug=*) DEBUG=${x/*=/};;
esac
done
check_debug "Debug point 1. Exit to continue initrd script (mount NBD device)."
log_info "NBD parameters: device $NBD_DEV, server $NBD_SERVER:$NBD_PORT"
# check if smack is active (and if so, mount smackfs)
grep -q smackfs /proc/filesystems && {
SMACK=y
do_mount_fs smackfs /sys/fs/smackfs
# adjust current label and network label
echo System >/proc/self/attr/current
echo System >/sys/fs/smackfs/ambient
}
# start nbd client
try=5
while :;do
log_info "Starting NBD client"
nbd-client $NBD_SERVER $NBD_PORT $NBD_DEV && { log_info "NBD client successfully started"; break; }
log_info "NBD client failed"
[[ $try -gt 0 ]] && { log_info "Retrying ($try trie(s) left)..."; sleep 3; try=$(( try - 1 )); continue; }
bail_out "Unable to mount NBD device $NBD_DEV using server $NBD_SERVER:$NBD_PORT"
done
# mount NBD device
mkdir -p /sysroot
mount $NBD_DEV -o noatime /sysroot || bail_out "Unable to mount root NBD device"
# move mounted devices to new root
cd /sysroot
for x in dev proc sys tmp run; do
log_info "Moving /$x to new rootfs"
mount -o move /$x $x
done
# switch to new rootfs
log_info "Switching to new rootfs"
mkdir -p run/initramfs
pivot_root . run/initramfs || bail_out "pivot_root failed."
# workaround for connman (avoid bringing down the network interface used for booting, disable DNS proxy)
if [[ -f /lib/systemd/system/connman.service ]]; then
log_info "Adjusting Connman configuration"
iface=$(ip -o link show up | tr ':' ' ' | awk '{print $2}' | grep -v -e "^lo$" | head -1)
sed -i "s|connmand -n\$|connmand -r -n -I $iface|g" /lib/systemd/system/connman.service
fi
# also use /proc/net/pnp to generate /etc/resolv.conf
grep -v bootserver /proc/net/pnp | sed 's/^domain/search/g' >/etc/resolv.conf
# finally, run systemd
check_debug "Debug point 2. Exit to continue initrd script (run systemd)."
log_info "Exec'ing systemd"
# banner generator: echo "AGL Booting . . ." | figlet -f slant -w 80 -c
cat <<'EOF' >&2
________________________________________________________________________________
___ ________ ____ __ _
/ | / ____/ / / __ )____ ____ / /_(_)___ ____ _
/ /| |/ / __/ / / __ / __ \/ __ \/ __/ / __ \/ __ `/
/ ___ / /_/ / /___ / /_/ / /_/ / /_/ / /_/ / / / / /_/ / _ _ _
/_/ |_\____/_____/ /_____/\____/\____/\__/_/_/ /_/\__, / (_) (_) (_)
_____________________________________________________/____/_____________________
EOF
exec /lib/systemd/systemd </dev/console >/dev/console 2>&1
bail_out
|
