#!/bin/bash

set -o errexit

mode=$1
shift || mode="no_action"

ROOT=../..
IMAGE=$( readlink -f $ROOT/minix_x86.img )
DISK=$( readlink -f $ROOT/minix_x86.disk )
RC=$( readlink -f $ROOT/minix_x86.rc )

HYPER=${HYPER:-}
DISK_SIZE=${DISK_SIZE:-1024}
DISK_MNT=${DISK_MNT:-/media/minix-disk}

function rc_create {
    cat <<EOF
#!/bin/sh

set -o errexit

[ -d /ext ] || mkdir /ext
mount -t ext2 /dev/c0d1 /ext

if [ -f /ext/etc/rc ]; then
    sh /ext/etc/rc
fi

EOF
}

function rc_ext_default_create {
    cat <<EOF
#!/bin/sh

echo "/ext/etc/rc: /ext mounted correctly."

EOF
}

function disk_mount {
    local mnt=$1
    echo "* Mounting ${DISK} to $mnt..."
    [ -d $mnt ] || sudo mkdir -p $mnt
    umountdisk &> /dev/null || true
    sudo mount -o loop $DISK $mnt
}

function disk_umount {
    echo "* Unmounting ${DISK}..."
    sudo umount $DISK
}

function disk_build {
    local size=$1
    local tmp_mnt=$( mktemp -d /tmp/clientctl-XXXXX )
    echo "* Building ${size} MB disk image..."
    dd if=/dev/zero of=$DISK bs=1M count=$size
    mkfs -t ext2 -i 4096 -b 4096 -F $DISK
    echo "* Setting up /ext/etc/rc file executed at startup..."
    rc_create > $RC
    disk_mount $tmp_mnt
    [ -d $tmp_mnt/etc ] || mkdir -p $tmp_mnt/etc
    rc_ext_default_create > $tmp_mnt/etc/rc
    disk_umount
    rm -rf $tmp_mnt
}

case "$mode" in
  'buildimage')
    (cd $ROOT && CREATE_IMAGE_ONLY=1 releasetools/x86_hdimage.sh)
    ;;
  'builddisk')
    rm -f $DISK
    disk_build $DISK_SIZE
    ;;
  'mountdisk')
    disk_mount $DISK_MNT
    ;;
  'umountdisk')
    disk_umount
    ;;
  'run')
    if [ "$HYPER" == "" ]; then
        if which kvm2 > /dev/null; then
            HYPER=kvm
        elif [ -e /dev/kvm ]; then
            HYPER="qemu-system-i386 --enable-kvm"
        else
            HYPER=qemu-system-i386
        fi
    fi
    opts="-hda $IMAGE"
    [ ! -f $DISK ] || opts="$opts -hdb $DISK"
    (cd ../../../obj.i386/destdir.i386/multiboot && $HYPER -nographic -kernel kernel -append "console=tty00 rootdevname=c0d0p1" -initrd "mod01_ds,mod02_rs,mod03_pm,mod04_sched,mod05_vfs,mod06_memory,mod07_tty,mod08_mfs,mod09_vm,mod10_pfs,mod11_init" $opts)
    ;;
  *)
    echo "Invalid action: $mode"
    exit 1
    ;;
esac