✨ feat: Add package docker-to-rootfs (#121)

This package will handle creating the rootfs needed by CrosVM

> More info incoming

packages/docker-to-rootfs/create_image.sh

@@ -0,0 +1,54 @@
+#!/bin/bash
+
+set -e
+
+UID_HOST=$1
+GID_HOST=$2
+VM_DISK_SIZE_MB=$3
+
+echo_blue() {
+    local font_blue="\033[94m"
+    local font_bold="\033[1m"
+    local font_end="\033[0m"
+
+    echo -e "\n${font_blue}${font_bold}${1}${font_end}"
+}
+
+echo_blue "[Create disk image]"
+[ -z "${VM_DISK_SIZE_MB}" ] && VM_DISK_SIZE_MB=1024
+VM_DISK_SIZE_SECTOR=$(expr $VM_DISK_SIZE_MB \* 1024 \* 1024 / 512)
+dd if=/dev/zero of=/os/${DISTR}.img bs=${VM_DISK_SIZE_SECTOR} count=512
+
+echo_blue "[Make partition]"
+echo "type=83,bootable" | sfdisk /os/${DISTR}.img
+
+echo_blue "\n[Format partition with ext4]"
+losetup -D
+LOOPDEVICE=$(losetup -f)
+echo -e "\n[Using ${LOOPDEVICE} loop device]"
+losetup -o $(expr 512 \* 2048) ${LOOPDEVICE} /os/${DISTR}.img
+mkfs.ext4 ${LOOPDEVICE}
+
+echo_blue "[Copy ${DISTR} directory structure to partition]"
+mkdir -p /os/mnt
+mount -t auto ${LOOPDEVICE} /os/mnt/
+cp -a /os/${DISTR}.dir/. /os/mnt/
+
+echo_blue "[Setup extlinux]"
+extlinux --install /os/mnt/boot/
+cp /os/syslinux.cfg /os/mnt/boot/syslinux.cfg
+rm /os/mnt/.dockerenv
+
+echo_blue "[Unmount]"
+umount /os/mnt
+losetup -D
+
+echo_blue "[Write syslinux MBR]"
+dd if=/usr/lib/syslinux/mbr/mbr.bin of=/os/${DISTR}.img bs=440 count=1 conv=notrunc
+
+#echo_blue "[Convert to qcow2]"
+#qemu-img convert -c /os/${DISTR}.img -O qcow2 /os/${DISTR}.qcow2
+
+[ "${UID_HOST}" -a "${GID_HOST}" ] && chown ${UID_HOST}:${GID_HOST} /os/${DISTR}.img
+
+rm -r /os/${DISTR}.dir /os/${DISTR}.tar