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#!/usr/bin/bash
# dracut-lib to use debugging functions
command -v warn >/dev/null || . /lib/dracut-lib.sh
command -v emergency_shell >/dev/null || . /lib/dracut-lib.sh
###############################################################################
# GLOBALS
#
# TODO make this configurable
[ -f /opt/openslx/config ] && . /opt/openslx/config
[ -z $SLX_DNBD3_SERVER ] && SLX_DNBD3_SERVER="132.230.4.1"
[ -z $SLX_STAGE4 ] && SLX_STAGE4="stage4/joe/centos7"
[ -z $SLX_STAGE4_RID ] && SLX_STAGE4_RID="4"
declare -rg DNBD3_SERVER="$SLX_DNBD3_SERVER"
declare -rg DNBD3_IMAGE="$SLX_STAGE4"
declare -rg DNBD3_RID="$SLX_STAGE4_RID"
declare -rg DNBD3_DEVICE="/dev/dnbd0"
declare -rg QCOW_CONTAINER="/opt/openslx/system/system.qcow2"
#
# END GLOBALS
###############################################################################
###############################################################################
# FUNCTION DEFINITIONS
#
# helper to do some sanity checks
check_dnbd3() {
if [ ! command -v "dnbd3-client" >/dev/null ]; then
warn "No 'dnbd3-client' found. Was the initramfs built correctly?"
emergency_shell -n "Error in $0"
return 1
fi
return 0
}
# helper to connect to the dnbd3-server
connect_dnbd3() {
# check if it already connected
local current_image_name="$(cat /sys/block/${DNBD3_DEVICE#/dev/}/net/image_name)"
[ "x${current_image_name}" != "x(null)" ] && return 0
# not connected yet, do it
if ! dnbd3-client -h "${DNBD3_SERVER}" \
-i "${DNBD3_IMAGE}" \
-r "${DNBD3_RID}" \
-d "${DNBD3_DEVICE}" ; then
warn "Failed to mount $DNBD3_IMAGE from $DNBD3_SERVER to $DNBD3_DEVICE"
emergency_shell -n "Error in $0"
return 1
fi
return 0
}
# helper to create the qcow2 container file using
# DNBD3_DEVICE as the base of the filesystem
# QCOW_CONTAINER as the writable file
# (our future rootfs)
create_qcow() {
# check if we already created the qcow2-container
[ -e "$QCOW_CONTAINER" ] && return 0
# check if we have our target directory, if not create it
[ ! -d "$(busybox dirname $QCOW_CONTAINER)" ] && \
mkdir -p "$(busybox dirname $QCOW_CONTAINER)"
# we did not, let's create it
if ! qemu-img create -f qcow2 -o \
backing_file="$DNBD3_DEVICE",backing_fmt=qcow2 "$QCOW_CONTAINER"; then
warn "Failed to create qcow2-Container from $DNBD3_DEVICE"
emergency_shell -n "Error in $0"
rm -f -- "$QCOW_CONTAINER"
return 1
fi
return 0
}
# helper to start qemu-nbd on localhost:2000
# use our wrapper to set argv[0][0] to '@'
# this keeps qemu-nbd running after switching root
export_qcow() {
# check if we already have a qemu-nbd
if [ -e /tmp/qemu-nbd.pid ]; then
kill -0 $(cat /tmp/qemu-nbd.pid) && return 0
fi
# since we use the wrapper, we need a little more logic to see if it runs
/usr/bin/systemd-preserve-process-marker \
/usr/bin/qemu-nbd -t -p 2000 "$QCOW_CONTAINER" &
# the wrapper returns 255 if the qemu-nbd binary is missing
local qemu_nbd_pid="$!"
for i in 0.5 1 2; do
sleep $i
if ! kill -0 $qemu_nbd_pid; then
# not running
wait $qemu_nbd_pid
local ret_wrapper="$?"
if [ "${ret_wrapper}" -eq 127 ]; then
# wrapper was not found by bash
warn "No such file or directory: /usr/bin/systemd-preserve-process-marker"
elif [ "${ret_wrapper}" -eq 255 ]; then
# qemu-nbd was not found
warn "No such file or directory: /usr/bin/qemu-nbd"
fi
emergency_shell -n "Error in $0"
return 1
else
# all good, qemu-nbd is running, remember its pid
echo $qemu_nbd_pid > /tmp/qemu-nbd.pid
return 0
fi
done
# fallback
return 1
}
# helper to mount the qcow2-container per nbd
connect_qcow() {
# try to mount the locally exported qcow2-container using nbd-client
if /usr/bin/systemd-preserve-process-marker \
nbd-client --persist 127.0.0.1 2000 /dev/nbd0; then
# it worked, lets set the symlink to /dev/root as dracut needs it
# later on to mount that device to the future root (/sysroot)
ln -sf /dev/nbd0 /dev/root
return 0
else
# this is pretty bad, dracut would spawn an emergency later on
# since there is no /dev/root to mount.
# For debugging purposes, we drop an emergency shell ourselves
# if the mount fails.
warn "Could not mount /dev/nbd0 from 127.0.0.1:2000."
emergency_shell -n "Error in $0"
return 1
fi
}
#
# END FUNCTION DEFINITIONS
###############################################################################
# No main, use functions!
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