name : parse-nbdroot.sh #!/bin/sh # # Preferred format: # root=nbd:srv:port/exportname[:fstype[:rootflags[:nbdopts]]] # [root=*] netroot=nbd:srv:port/exportname[:fstype[:rootflags[:nbdopts]]] # # nbdopts is a comma separated list of options to give to nbd-client # # root= takes precedence over netroot= if root=nbd[...] # # Sadly there's no easy way to split ':' separated lines into variables netroot_to_var() { local v=${1}: set -- while [ -n "$v" ]; do set -- "$@" "${v%%:*}" v=${v#*:} done unset server port server=$2; port=$3; } # This script is sourced, so root should be set. But let's be paranoid [ -z "$root" ] && root=$(getarg root=) if [ -z "$netroot" ]; then for netroot in $(getargs netroot=); do [ "${netroot%%:*}" = "nbd" ] && break done [ "${netroot%%:*}" = "nbd" ] || unset netroot fi # Root takes precedence over netroot if [ "${root%%:*}" = "nbd" ] ; then if [ -n "$netroot" ] ; then warn "root takes precedence over netroot. Ignoring netroot" fi netroot=$root unset root fi # If it's not nbd we don't continue [ "${netroot%%:*}" = "nbd" ] || return if [ -n "${DRACUT_SYSTEMD}" ] && [ "$root" = "dhcp" ]; then echo "root=$netroot" > /etc/cmdline.d/root.conf systemctl --no-block daemon-reload fi # Check required arguments netroot_to_var $netroot [ -z "$server" ] && die "Argument server for nbdroot is missing" [ -z "$port" ] && die "Argument port for nbdroot is missing" # NBD actually supported? incol2 /proc/devices nbd || modprobe nbd || die "nbdroot requested but kernel/initrd does not support nbd" # Done, all good! rootok=1 # Shut up init error check if [ -z "$root" ]; then root=block:/dev/root wait_for_dev -n /dev/root fi