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#!/usr/bin/env bash
# region imports
type getarg >/dev/null 2>&1 || source /lib/dracut-lib.sh
source "/usr/lib/rebash/core.sh"
core.import exceptions
exceptions.activate
core.import utils
core.import logging
logging.set_commands_log_level debug
logging.set_log_level debug
# endregion
( # subshell for variable scoping
SLX_SERVER_BASE="$(getargs slxbase=)"
source /etc/openslx
# region connect dnbd3
IFS_backup="$IFS"
IFS=","
return_code=1
for host in ${SLX_DNBD3_SERVERS}; do
logging.info "Trying host '$host'."
if systemd-preserve-process-marker dnbd3-client --host "$host" --image \
"${SLX_SERVER_BASE#/}${SLX_DNBD3_IMAGE}" --device "$SLX_DNBD3_DEVICE" \
--rid "$SLX_DNBD3_RID"
then
return_code=0
break
fi
done
IFS="$IFS_backup"
if [[ $return_code != 0 ]]; then
logging.warn "Failed to connect '${SLX_SERVER_BASE#/}${SLX_DNBD3_IMAGE}' from" \
"one of '$SLX_DNBD3_SERVERS' to '$SLX_DNBD3_DEVICE'."
exit 1
fi
# endregion
read_only_device=""
if ! qemu-img info --output json "$SLX_DNBD3_DEVICE" | grep '"format": "raw"'
then
read_only_device="$(container-unpack-xmount $SLX_DNBD3_DEVICE)"
else
# workaround to detect partitions on raw disks
# can be omited when the dnbd3 kernel module supports it (like the nbd
# kernel module with parameter 'max_part')
loop_device="$(losetup -f)"
touch $read_only_device
losetup "$loop_device" "$read_only_device" --partscan
udevadm settle
read_only_device="$loop_device"
fi
# region detect read-only partition
for i in 0.5 1 2; do
if read_only_partition=$(utils.find_block_device \
"$SLX_SYSTEM_PARTITION_IDENTIFIER" "$read_only_device"); then
break
else
logging.warn "Failed to find unique device with identifier" \
"'${SLX_SYSTEM_PARTITION_IDENTIFIER}'; matched devices:" \
"'${read_only_partition}'"
sleep $i
fi
done
# endregion
# region detect writable partition
if ! persistent_device=$(utils.find_block_device \
"$SLX_WRITABLE_DEVICE_IDENTIFIER"); then
logging.warn "Failed to find unique device with identifier" \
"'${SLX_WRITABLE_DEVICE_IDENTIFIER}'; matched devices:" \
"'${persistent_device}'"
fi
# TODO move somewhere else
#tmp_device="$(utils.find_block_device \
#'$SLX_TMP_PARTITION_IDENTIFIER')"
#if [ -n $tmp_device ]; then
#mount --type auto "$tmp_device" "$NEWROOT/tmp"
#fi
persistent='N' # 'P' for persistent storage, 'N' for not persistent
if [ -n "$persistent_device" ]; then
writable_device="$persistent_device"
if [ "$SLX_WRITABLE_DEVICE_PERSISTENT" = "yes" ]; then
persistent='P'
fi
else
ramdisk_size="$SLX_RAMDISK_SIZE"
if [ "$ramdisk_size" = "" ]; then
ramdisk_size="$(cat /proc/meminfo | awk '/MemTotal/ {print $2}')"
fi
modprobe brd max_part=1 rd_size="$ramdisk_size"
writable_device='/dev/ram0'
persistent='N'
fi
# persistent storage on a filesystem (e.g. usb stick)
# writable_device="$(losetup -f)"
#dd if=/dev/zero of=persistent_storage.img bs=1k count=1000
#losetup "$writable_device" persistent_storage.img
#persistent='P'
# endregion
logging.info "Using read-only device: $read_only_partition"
logging.info "Using writable device $writable_device, persistency: $persistent"
# combine devices with device mapper
device-add-write-layer "root" "$read_only_partition" "$writable_device" "$persistent"
) || exit $?
exceptions.deactivate
# region vim modline
# vim: set tabstop=4 shiftwidth=4 expandtab:
# vim: foldmethod=marker foldmarker=region,endregion:
# endregion
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