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📁 ..	-	2026-03-21 15:44
📄 module-setup.sh #!/usr/bin/bash # called by dracut check() { local _rootdev # if an nbd device is not somewhere in the chain of devices root is # mounted on, fail the hostonly check. [[ $hostonly ]] \|\| [[ $mount_needs ]] && { _rootdev=$(find_root_block_device) [[ -b /dev/block/$_rootdev ]] \|\| return 1 check_block_and_slaves block_is_nbd "$_rootdev" \|\| return 255 } require_binaries nbd-client \|\| return 1 return 0 } # called by dracut depends() { # We depend on network modules being loaded echo network rootfs-block } # called by dracut installkernel() { instmods nbd } # called by dracut install() { inst nbd-client inst_hook cmdline 90 "$moddir/parse-nbdroot.sh" inst_script "$moddir/nbdroot.sh" "/sbin/nbdroot" if dracut_module_included "systemd-initrd"; then inst_script "$moddir/nbd-generator.sh" "$systemdutildir"/system-generators/dracut-nbd-generator fi dracut_need_initqueue }	975 B	2022-06-19 22:35
📄 nbd-generator.sh #!/usr/bin/sh type getarg > /dev/null 2>&1 \|\| . /lib/dracut-lib.sh [ -z "$root" ] && root=$(getarg root=) [ "${root%%:}" = "nbd" ] \|\| exit 0 GENERATOR_DIR="$2" [ -z "$GENERATOR_DIR" ] && exit 1 [ -d "$GENERATOR_DIR" ] \|\| mkdir -p "$GENERATOR_DIR" ROOTFLAGS="$(getarg rootflags)" nroot=${root#nbd:} nbdserver=${nroot%%:} if [ "${nbdserver%"${nbdserver#?}"}" = "[" ]; then nbdserver=${nroot#[} nbdserver=${nbdserver%%]:}\] nroot=${nroot#]:} else nroot=${nroot#:} fi nbdport=${nroot%%:} nroot=${nroot#:} nbdfstype=${nroot%%:} nroot=${nroot#:} nbdflags=${nroot%%:} if [ "$nbdflags" = "$nbdfstype" ]; then unset nbdflags fi if [ "$nbdfstype" = "$nbdport" ]; then unset nbdfstype fi [ -n "$nbdflags" ] && ROOTFLAGS="$nbdflags" if getarg "ro"; then if [ -n "$ROOTFLAGS" ]; then ROOTFLAGS="$ROOTFLAGS,ro" else ROOTFLAGS="ro" fi fi if [ -n "$nbdfstype" ]; then ROOTFSTYPE="$nbdfstype" else ROOTFSTYPE=$(getarg rootfstype=) \|\| unset ROOTFSTYPE fi { echo "[Unit]" echo "Before=initrd-root-fs.target" echo "[Mount]" echo "Where=/sysroot" echo "What=/dev/root" [ -n "$ROOTFSTYPE" ] && echo "Type=${ROOTFSTYPE}" [ -n "$ROOTFLAGS" ] && echo "Options=${ROOTFLAGS}" } > "$GENERATOR_DIR"/sysroot.mount exit 0	1.27 KB	2022-06-19 22:35
📄 nbdroot.sh #!/usr/bin/sh type getarg > /dev/null 2>&1 \|\| . /lib/dracut-lib.sh PATH=/usr/sbin:/usr/bin:/sbin:/bin # Huh? Empty $1? [ -z "$1" ] && exit 1 # Huh? Empty $2? [ -z "$2" ] && exit 1 # Huh? Empty $3? [ -z "$3" ] && exit 1 # root is in the form root=nbd:srv:port[:fstype[:rootflags[:nbdopts]]] # shellcheck disable=SC2034 netif="$1" nroot="$2" NEWROOT="$3" # If it's not nbd we don't continue [ "${nroot%%:}" = "nbd" ] \|\| return nroot=${nroot#nbd:} nbdserver=${nroot%%:} if [ "${nbdserver%"${nbdserver#?}"}" = "[" ]; then nbdserver=${nroot#[} nbdserver=${nbdserver%%]:} nroot=${nroot#]:} else nroot=${nroot#:} fi nbdport=${nroot%%:} nroot=${nroot#:} nbdfstype=${nroot%%:} nroot=${nroot#:} nbdflags=${nroot%%:} nbdopts=${nroot#:} if [ "$nbdopts" = "$nbdflags" ]; then unset nbdopts fi if [ "$nbdflags" = "$nbdfstype" ]; then unset nbdflags fi if [ "$nbdfstype" = "$nbdport" ]; then unset nbdfstype fi if [ -z "$nbdfstype" ]; then nbdfstype=auto fi # look through the NBD options and pull out the ones that need to # go before the host etc. Append a ',' so we know we terminate the loop nbdopts=${nbdopts}, while [ -n "$nbdopts" ]; do f=${nbdopts%%,} nbdopts=${nbdopts#,} if [ -z "$f" ]; then break fi if [ -z "${f%bs=}" -o -z "${f%timeout=}" ]; then preopts="$preopts $f" continue fi opts="$opts $f" done # look through the flags and see if any are overridden by the command line nbdflags=${nbdflags}, while [ -n "$nbdflags" ]; do f=${nbdflags%%,} nbdflags=${nbdflags#,} if [ -z "$f" ]; then break fi if [ "$f" = "ro" -o "$f" = "rw" ]; then nbdrw=$f continue fi fsopts=${fsopts:+$fsopts,}$f done getarg ro && nbdrw=ro getarg rw && nbdrw=rw fsopts=${fsopts:+$fsopts,}${nbdrw} # XXX better way to wait for the device to be made? i=0 while [ ! -b /dev/nbd0 ]; do [ $i -ge 20 ] && exit 1 udevadm settle --exit-if-exists=/dev/nbd0 i=$((i + 1)) done # If we didn't get a root= on the command line, then we need to # add the udev rules for mounting the nbd0 device if [ "$root" = "block:/dev/root" -o "$root" = "dhcp" ]; then printf 'KERNEL=="nbd0", ENV{DEVTYPE}!="partition", ENV{ID_FS_TYPE}=="?", SYMLINK+="root"\n' > /etc/udev/rules.d/99-nbd-root.rules udevadm control --reload wait_for_dev -n /dev/root if [ -z "$DRACUT_SYSTEMD" ]; then type write_fs_tab > /dev/null 2>&1 \|\| . /lib/fs-lib.sh write_fs_tab /dev/root "$nbdfstype" "$fsopts" printf '/bin/mount %s\n' \ "$NEWROOT" \ > "$hookdir"/mount/01-$$-nbd.sh else mkdir -p /run/systemd/system/sysroot.mount.d cat << EOF > /run/systemd/system/sysroot.mount.d/dhcp.conf [Mount] Where=/sysroot What=/dev/root Type=$nbdfstype Options=$fsopts EOF systemctl --no-block daemon-reload fi # if we're on systemd, use the nbd-generator script # to create the /sysroot mount. fi if ! [ "$nbdport" -gt 0 ] 2> /dev/null; then nbdport="-name $nbdport" fi if ! nbd-client -check /dev/nbd0 > /dev/null; then # shellcheck disable=SC2086 nbd-client -p -systemd-mark "$nbdserver" $nbdport /dev/nbd0 $opts \|\| exit 1 fi need_shutdown exit 0	3.19 KB	2022-06-19 22:35
📄 parse-nbdroot.sh #!/usr/bin/sh # # Preferred format: # root=nbd:srv:port/exportname[:fstype[:rootflags[:nbdopts]]] # [root=] netroot=nbd:srv:port/exportname[:fstype[:rootflags[:nbdopts]]] # # nbdopts is a comma separated list of options to give to nbd-client # # root= takes precedence over netroot= if root=nbd[...] # # This script is sourced, so root should be set. But let's be paranoid [ -z "$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 [ "${netroot%%:}" = "nbd" ] \|\| return # Check required arguments nroot=${netroot#nbd:} server=${nroot%%:} if [ "${server%"${server#?}"}" = "[" ]; then server=${nroot#[} server=${server%%]:}\] nroot=${nroot#]:} else nroot=${nroot#:} fi port=${nroot%%:} unset nroot [ -z "$server" ] && die "Argument server for nbdroot is missing" [ -z "$port" ] && die "Argument port for nbdroot is missing" # NBD actually supported? incol2 /proc/devices nbd \|\| modprobe nbd \|\| die "nbdroot requested but kernel/initrd does not support nbd" # Done, all good! # shellcheck disable=SC2034 rootok=1 # Shut up init error check if [ -z "$root" ]; then root=block:/dev/root # the device is created and waited for in ./nbdroot.sh fi echo 'nbd-client -check /dev/nbd0 > /dev/null 2>&1' > "$hookdir"/initqueue/finished/nbdroot.sh	1.66 KB	2022-06-19 22:35

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