3 ################################################################################
5 # Init script to boot over network through NBD
7 # Contact: Stéphane Desneux <stephane.desneux@iot.bzh>
9 ################################################################################
11 # banner generator: echo "AGL - Netboot" | figlet -f slant -w 80 -c
13 ________________________________________________________________________________
14 ___ ________ _ __ __ __ __
15 / | / ____/ / / | / /__ / /_/ /_ ____ ____ / /_
16 / /| |/ / __/ / ______ / |/ / _ \/ __/ __ \/ __ \/ __ \/ __/
17 / ___ / /_/ / /___ /_____/ / /| / __/ /_/ /_/ / /_/ / /_/ / /_
18 /_/ |_\____/_____/ /_/ |_/\___/\__/_.___/\____/\____/\__/
19 ________________________________________________________________________________
30 # -------------------------------------------
32 log_info() { echo "$0[$$]: $@" >&2; }
33 log_error() { echo "$0[$$]: ERROR $@" >&2; }
36 log_info "mounting FS: $@"
37 [[ -e /proc/filesystems ]] && { grep -q "$1" /proc/filesystems || { log_error "Unknown filesystem"; return 1; } }
38 [[ -d "$2" ]] || mkdir -p "$2"
39 [[ -e /proc/mounts ]] && { grep -q -e "^$1 $2 $1" /proc/mounts && { log_info "$2 ($1) already mounted"; return 0; } }
40 mount -t "$1" "$1" "$2"
45 check_debug "Reboot will occur after exiting this shell."
46 log_info "Rebooting..."
59 find_active_interface() {
60 [[ ! -d /sys/class/net ]] && { log_error "find_active_interface: /sys/class/net doesn't exist"; return 2; }
62 for x in $(ls -d /sys/class/net/* 2>/dev/null); do
64 # find interfaces with:
65 # - type == 1 (ethernet)
69 [[ $(cat $x/type) != 1 ]] && continue
70 [[ -d $x/wireless ]] && continue
71 [[ $(cat $x/operstate) != "up" ]] && continue
73 log_info "find_active_interface: first active interface is $iface"
78 log_error "Unable to find any active network interface."
82 # -------------------------------------------
84 export PATH=/sbin:/usr/sbin:/bin:/usr/bin
86 log_info "starting initrd script"
88 do_mount_fs proc /proc
89 do_mount_fs sysfs /sys
90 do_mount_fs devtmpfs /dev
91 do_mount_fs devpts /dev/pts
92 do_mount_fs tmpfs /dev/shm
93 do_mount_fs tmpfs /tmp
94 do_mount_fs tmpfs /run
96 # parse kernel commandline to get NBD server
97 for x in $(cat /proc/cmdline); do
99 nbd.server=*) NBD_SERVER=${x/*=/};;
100 nbd.port=*) NBD_PORT=${x/*=/};;
101 nbd.dev=*) NBD_DEV=/dev/${x/*=/};;
102 nbd.namev3=*) NBD_NAMEV3=${x/*=/};;
103 nbd.debug=*) DEBUG=${x/*=/};;
107 check_debug "Debug point 1. Exit to continue initrd script (mount NBD device)."
109 log_info "NBD parameters: device $NBD_DEV, server $NBD_SERVER:$NBD_PORT"
114 log_info "Starting NBD client"
115 if [ -z "${NBD_NAMEV3}" ]; then
116 nbd-client -persist $NBD_SERVER $NBD_PORT $NBD_DEV && { log_info "NBD client successfully started"; break; }
117 log_info "NBD client failed"
119 nbd3-client $NBD_SERVER $NBD_DEV --name $NBD_NAMEV3 && { log_info "NBD3 client successfully started"; break; }
120 log_info "NBDv3 client failed"
122 [[ $try -gt 0 ]] && { log_info "Retrying ($try trie(s) left)..."; sleep 3; try=$(( try - 1 )); continue; }
124 bail_out "Unable to mount NBD device $NBD_DEV using server $NBD_SERVER:$NBD_PORT"
129 mount $NBD_DEV -o noatime /sysroot || bail_out "Unable to mount root NBD device"
131 # move mounted devices to new root
133 for x in dev proc sys tmp run; do
134 log_info "Moving /$x to new rootfs"
138 # switch to new rootfs
139 log_info "Switching to new rootfs"
140 mkdir -p boot/initramfs
141 pivot_root . boot/initramfs || bail_out "pivot_root failed."
143 # workaround for connman (avoid bringing down the network interface used for booting, disable DNS proxy)
144 if [[ -f /lib/systemd/system/connman.service ]]; then
146 iface=$(find_active_interface)
147 [[ -n "$iface" ]] && newopts="$newopts -I $iface"
149 log_info "Adjusting Connman command line. Will be: 'connmand $newopts'"
150 sed -i "s|connmand -n\$|connmand $newopts|g" /lib/systemd/system/connman.service
153 # also use /proc/net/pnp to generate /etc/resolv.conf
154 rm -f /etc/resolv.conf
155 grep -v bootserver /proc/net/pnp | sed 's/^domain/search/g' >/etc/resolv.conf
157 # Do SELinux relabeling if required, to avoid a reboot that would complicate CI
158 if [ -f /.autorelabel ]; then
159 # Nothing SELinux related works w/o the fs mounted
160 do_mount_fs selinuxfs /sys/fs/selinux
162 # Labeling requires the policy to be loaded
163 log_info "Loading SELinux policy"
164 /usr/sbin/load_policy
166 /usr/bin/selinux-autorelabel.sh
168 # Will get remounted by systemd startup, unmount to keep that behavior
169 # more like the non-netboot case.
170 umount /sys/fs/selinux
173 # unmount tmp and run to let systemd remount them
174 log_info "Unmounting /tmp and /run"
178 # finally, run systemd
179 check_debug "Debug point 2. Exit to continue initrd script (run systemd)."
181 log_info "Exec'ing systemd"
182 # banner generator: echo "AGL Booting . . ." | figlet -f slant -w 80 -c
184 ________________________________________________________________________________
185 ___ ________ ____ __ _
186 / | / ____/ / / __ )____ ____ / /_(_)___ ____ _
187 / /| |/ / __/ / / __ / __ \/ __ \/ __/ / __ \/ __ `/
188 / ___ / /_/ / /___ / /_/ / /_/ / /_/ / /_/ / / / / /_/ / _ _ _
189 /_/ |_\____/_____/ /_____/\____/\____/\__/_/_/ /_/\__, / (_) (_) (_)
190 _____________________________________________________/____/_____________________
193 exec /lib/systemd/systemd </dev/console >/dev/console 2>&1