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source "/usr/lib/utils.sh"
declare -rg DNBD3_SERVER="gateway"
declare -rg DNBD3_IMAGE="archLinux.qcow2"
declare -rg DNBD3_RID="0"
declare -rg DNBD3_DEVICE="/dev/dnbd0"
# Close previous connections to be able to run this script many times.
dnbd3-client --device /dev/dnbd0 --close && \
dnbd3-client --host "$DNBD3_SERVER" --image "$DNBD3_IMAGE" --device \
"$DNBD3_DEVICE" --rid "$DNBD3_RID" && \
qemu-nbd --connect=/dev/nbd0 /dev/dnbd0 --read-only && \
local read_only_partition="$(utils_create_partition_via_offset \
/dev/nbd0 system)" && \
# Make read-only partition writable.
# TODO implement persistent available indicator.
if true; then
local writable_device="/dev/ram0" && \
mknod --mode 660 "$writable_device" b 1 1 && \
chown root.disk "$writable_device"
else
# Use next free loop device.
local writable_device="$(losetup -f)" && \
dd if=/dev/zero of=persistent_storage.img bs=1k count=1000 && \
losetup "$writable_device" persistent_storage.img
fi
local size="$(blockdev --getsz "$read_only_partition")" && \
local writable_partition_name="root" && \
dmsetup create "$writable_partition_name" --table \
"0 $partion_size snapshot $read_only_partition $writable_device N 1"
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