mirror of https://github.com/linka-cloud/d2vm.git
117 lines
2.3 KiB
Bash
Executable File
117 lines
2.3 KiB
Bash
Executable File
#!/usr/bin/env bash
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OUT="/dev/null"
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if [[ -n "$DEBUG" ]]; then
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set -x
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OUT="/dev/stderr"
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fi
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set -e
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SRC=${1:-rootfs.tar}
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DISK_NAME=${2:-disk0}
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SIZE=${3:-10G}
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BLOCK="$DISK_NAME.raw"
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QCOW2="$DISK_NAME.qcow2"
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MOUNTPOINT=/mnt
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cleanup() {
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rm -rf $BLOCK
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}
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make_img() {
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echo "Creating raw image of size $SIZE"
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fallocate -l $SIZE $BLOCK &> $OUT
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(
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echo n # Add a new partition
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echo p # Primary partition
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echo 1 # Partition number
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echo # First sector (Accept default: 1)
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echo # Last sector (Accept default: varies)
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echo a
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echo w # Write changes
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) | fdisk $BLOCK &> $OUT
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}
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mount_img() {
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echo "Mounting image"
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DEVICE_ROOT=$(losetup --show -f $BLOCK)
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kpartx -v -a $DEVICE_ROOT &> $OUT
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DEVICE=/dev/mapper/"$(basename ${DEVICE_ROOT})p1"
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mkfs.ext4 $DEVICE &> $OUT
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mount $DEVICE $MOUNTPOINT
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}
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unmount_img() {
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echo "Unmounting image"
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umount $MOUNTPOINT/
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kpartx -d $DEVICE_ROOT &> $OUT
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losetup -d $DEVICE_ROOT &> $OUT
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}
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copy_rootfs() {
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echo "Copying root file system"
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tar -xvf $SRC -C $MOUNTPOINT &> $OUT
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}
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setup_rootfs() {
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echo "Setting up root file system"
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uuid=$(blkid -s UUID -o value $DEVICE)
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mkdir -p $MOUNTPOINT/etc/
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echo "UUID=$uuid / ext4 errors=remount-ro 0 1" > $MOUNTPOINT/etc/fstab
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echo "nameserver 8.8.8.8" > $MOUNTPOINT/etc/resolv.conf
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echo localhost > $MOUNTPOINT/etc/hostname
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cat <<EOF > $MOUNTPOINT/etc/hosts
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127.0.0.1 localhost
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# The following lines are desirable for IPv6 capable hosts
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::1 ip6-localhost ip6-loopback
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fe00::0 ip6-localnet
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ff00::0 ip6-mcastprefix
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ff02::1 ip6-allnodes
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ff02::2 ip6-allrouters
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ff02::3 ip6-allhosts
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EOF
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rm -rf $MOUNTPOINT/usr/sbin/policy-rc.d
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}
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install_kernel() {
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echo "Installing linux kernel"
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extlinux --install $MOUNTPOINT/boot/ &> $OUT
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cat <<EOF > $MOUNTPOINT/boot/syslinux.cfg
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DEFAULT linux
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SAY Now booting the kernel from EXTLINUX...
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LABEL linux
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KERNEL /boot/vmlinuz
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APPEND ro root=/dev/sda1 initrd=/boot/initrd.img net.ifnames=0 console=tty0 console=ttyS0,115200n8
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EOF
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}
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setup_mbr() {
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echo "Setting up boot loader"
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dd if=/usr/lib/EXTLINUX/mbr.bin of=$BLOCK bs=440 count=1 conv=notrunc &> $OUT
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}
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convert() {
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echo "Converting image to QCOW2"
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echo ""
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qemu-img convert $BLOCK -O qcow2 $QCOW2
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}
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cleanup
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make_img
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mount_img
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copy_rootfs
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setup_rootfs
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install_kernel
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unmount_img
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setup_mbr
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convert
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