#!/bin/sh

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type getarg >/dev/null 2>&1 || . /lib/dracut-lib.sh

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PATH=/usr/sbin:/usr/bin:/sbin:/bin

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# Huh? Empty $1?

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[ -z "$1" ] && exit 1

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# Huh? Empty $2?

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[ -z "$2" ] && exit 1

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# Huh? Empty $3?

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[ -z "$3" ] && exit 1

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# root is in the form root=nbd:srv:port[:fstype[:rootflags[:nbdopts]]]

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netif="$1"

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nroot="$2"

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NEWROOT="$3"

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# If it's not nbd we don't continue

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[ "${nroot%%:*}" = "nbd" ] || return

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nroot=${nroot#nbd:}

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nbdserver=${nroot%%:*}; nroot=${nroot#*:}

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nbdport=${nroot%%:*}; nroot=${nroot#*:}

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nbdfstype=${nroot%%:*}; nroot=${nroot#*:}

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nbdflags=${nroot%%:*}

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nbdopts=${nroot#*:}

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if [ "$nbdopts" = "$nbdflags" ]; then

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unset nbdopts

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fi

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if [ "$nbdflags" = "$nbdfstype" ]; then

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unset nbdflags

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fi

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if [ "$nbdfstype" = "$nbdport" ]; then

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unset nbdfstype

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fi

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if [ -z "$nbdfstype" ]; then

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nbdfstype=auto

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fi

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# look through the NBD options and pull out the ones that need to

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# go before the host etc. Append a ',' so we know we terminate the loop

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nbdopts=${nbdopts},

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while [ -n "$nbdopts" ]; do

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f=${nbdopts%%,*}

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nbdopts=${nbdopts#*,}

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if [ -z "$f" ]; then

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break

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fi

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if [ -z "${f%bs=*}" -o -z "${f%timeout=*}" ]; then

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preopts="$preopts $f"

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continue

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fi

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opts="$opts $f"

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done

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# look through the flags and see if any are overridden by the command line

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nbdflags=${nbdflags},

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while [ -n "$nbdflags" ]; do

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f=${nbdflags%%,*}

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nbdflags=${nbdflags#*,}

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if [ -z "$f" ]; then

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break

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fi

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if [ "$f" = "ro" -o "$f" = "rw" ]; then

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nbdrw=$f

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continue

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fi

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fsopts=${fsopts:+$fsopts,}$f

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done

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getarg ro && nbdrw=ro

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getarg rw && nbdrw=rw

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fsopts=${fsopts:+$fsopts,}${nbdrw}

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# XXX better way to wait for the device to be made?

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i=0

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while [ ! -b /dev/nbd0 ]; do

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[ $i -ge 20 ] && exit 1

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if [ $UDEVVERSION -ge 143 ]; then

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udevadm settle --exit-if-exists=/dev/nbd0

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else

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sleep 0.1

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fi

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i=$(($i + 1))

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done

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# If we didn't get a root= on the command line, then we need to

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# add the udev rules for mounting the nbd0 device

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if [ "$root" = "block:/dev/root" -o "$root" = "dhcp" ]; then

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printf 'KERNEL=="nbd0", ENV{DEVTYPE}!="partition", ENV{ID_FS_TYPE}=="?*", SYMLINK+="root"\n' >> /etc/udev/rules.d/99-nbd-root.rules

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udevadm control --reload

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type write_fs_tab >/dev/null 2>&1 || . /lib/fs-lib.sh

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write_fs_tab /dev/root "$nbdfstype" "$fsopts"

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wait_for_dev -n /dev/root

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if [ -z "$DRACUT_SYSTEMD" ]; then

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printf '/bin/mount %s\n' \

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"$NEWROOT" \

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> $hookdir/mount/01-$$-nbd.sh

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fi

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fi

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if strstr "$(nbd-client --help 2>&1)" "systemd-mark"; then

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preopts="--systemd-mark $preopts"

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fi

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if [ "$nbdport" -gt 0 ] 2>/dev/null; then

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if [ -z "$DRACUT_SYSTEMD" ]; then

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nbd-client "$nbdserver" $nbdport /dev/nbd0 $preopts $opts || exit 1

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else

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systemd-run --no-block --service-type=forking --quiet \

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--description="nbd nbd0" \

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-p 'DefaultDependencies=no' \

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-p 'KillMode=none' \

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--unit="nbd0" -- nbd-client "$nbdserver" $nbdport /dev/nbd0 $preopts $opts >/dev/null 2>&1 || exit 1

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fi

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else

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if [ -z "$DRACUT_SYSTEMD" ]; then

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nbd-client -name "$nbdport" "$nbdserver" /dev/nbd0 $preopts $opts || exit 1

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else

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systemd-run --no-block --service-type=forking --quiet \

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--description="nbd nbd0" \

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-p 'DefaultDependencies=no' \

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-p 'KillMode=none' \

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--unit="nbd0" -- nbd-client -name "$nbdport" "$nbdserver" /dev/nbd0 $preopts $opts >/dev/null 2>&1 || exit 1

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fi

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fi

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# NBD doesn't emit uevents when it gets connected, so kick it

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echo change > /sys/block/nbd0/uevent

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udevadm settle

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need_shutdown

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exit 0

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