raspbian-ua-netinst-qemu-prepare

#!/usr/bin/env bash

check_tool()
{
    if [ -z "$(which "$1")" ]; then
        echo "The required tool \"${1}\" was not found. Abort."
        exit 1
    fi
}

SCRIPT_NAME="$(basename "$0")"

DISK_IMAGE="$1"

if [ -z "$DISK_IMAGE" ]; then
    echo "Usage: $SCRIPT_NAME DISK_IMAGE"
    exit 1
fi

if [ "$(id -u)" != 0 ]; then
    sudo "$0" "$@"
    exit "$?"
fi

check_tool "qemu-img"
check_tool "kpartx"

TEMP_DIR="$(mktemp -d ${SCRIPT_NAME}.XXXXXXXX)"

qemu-img resize "$DISK_IMAGE" 486M

LOOP_DEVICE_NAME="$(kpartx -avs "$DISK_IMAGE" | grep -o 'loop[0-9]' | head -n 1)"

mkdir -p "$TEMP_DIR/installer"
mkdir -p "$TEMP_DIR/disk-image/boot"

mount "/dev/mapper/${LOOP_DEVICE_NAME}p1" "$TEMP_DIR/disk-image/boot"

(cd "$TEMP_DIR/installer" && cpio -iv < ../"disk-image/boot/installer.cpio")
(cd "$TEMP_DIR/installer" && sed -i '/^bootdev=/s|/dev/mmcblk0|/dev/sda|' "etc/init.d/rcS")
(cd "$TEMP_DIR/installer" && sed -i '/^bootpartition=/s|/dev/mmcblk0p1|/dev/sda1|' "etc/init.d/rcS")
(cd "$TEMP_DIR/installer" && sed -i '/^rootdev=/s|/dev/mmcblk0|/dev/sda|' "etc/init.d/rcS")
(cd "$TEMP_DIR/installer" && sed -i '/^rootpartition=/s|$|/dev/sda2|' "etc/init.d/rcS")
(cd "$TEMP_DIR/installer" && find . | cpio -H newc -ov > ../"installer-qemu.cpio")
rm -rf "$TEMP_DIR/installer"

mv "$TEMP_DIR/installer-qemu.cpio" .

cat << EOF > "$TEMP_DIR/disk-image/boot/installer-config.txt"
packages=whiptail,pppoeconf
bootsize=+64M
EOF

cat << EOF > "$TEMP_DIR/disk-image/boot/post-install.txt"
sed -i 's|/dev/sda2|/dev/mmcblk0p2|' "/rootfs/boot/cmdline.txt"
sed -i 's|/dev/sda1|/dev/mmcblk0p1|' "/rootfs/etc/fstab"
sed -i 's|/dev/sda2|/dev/mmcblk0p2|' "/rootfs/etc/fstab"
echo "gpu_mem=16" >> "/rootfs/boot/config.txt"
EOF

sync

umount "$TEMP_DIR/disk-image/boot"

kpartx -d "$DISK_IMAGE" > "/dev/null"

rm -rf "$TEMP_DIR"