#!/bin/bash -x

# Handle running Poky images under qemu
#
# Copyright (C) 2006-2008 OpenedHand Ltd.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

# Call setting:
#   QEMU_MEMORY (optional) - set the amount of memory in the emualted system.
#   SERIAL_LOGFILE (optional) - log the serial port output to a file
#   CROSSPATH - the path to any cross toolchain to use with distcc
#
# Image options:
#   MACHINE - the machine to run
#   FSTYPE - the image type to run
#   KERNEL - the kernel image file to use
#   ROOTFS - the disk image file to use
#

if [ -z "$QEMU_MEMORY" ]; then
    case "$MACHINE" in
        "qemux86")
            QEMU_MEMORY="128M"
            ;;
        "qemux86-64")
            QEMU_MEMORY="128M"
            ;;
        "qemumips")
            QEMU_MEMORY="128M"
            ;;
        "qemuppc")
            QEMU_MEMORY="128M"
            ;;
        *)
            QEMU_MEMORY="64M"
            ;;
    esac

fi

# This file is created when poky-gen-tapdevs creates a bank of tap
# devices, indicating that the user should not bring up new ones using
# sudo.
NOSUDO_FLAG="/etc/poky-nosudo"

QEMUIFUP=`which poky-qemu-ifup`
QEMUIFDOWN=`which poky-qemu-ifdown`

NFSRUNNING="false"

acquire_lock() {
    lockfile=$1
    if [ -z "$lockfile" ]; then
        echo "Error: missing lockfile arg passed to acquire_lock()"
        return 1
    fi

    if [ -e "$lockfile.lock" ]; then
        # Check that the lockfile is not stale
        ps=`ps -ewwo pid | grep $(cat $lockfile.lock)`
        if [ -z "$ps" ]; then
            echo "Warning: Stale lock file detected, deleting $lockfile.lock"
            rm -f $lockfile.lock
            echo $$ > $lockfile.lock
        else
            return 1
        fi
    else
        echo $$ > $lockfile.lock
    fi

    return 0
}

release_lock() {
    lockfile=$1
    if [ -z "$lockfile" ]; then
        echo "Error: missing lockfile arg passed to release_lock()"
        return 1
    fi

    rm -f $lockfile.lock
}

LOCKDIR="/tmp/qemu-tap-locks"
[ ! -d "$LOCKDIR" ] && mkdir $LOCKDIR

POSSIBLE=`ifconfig -a | grep '^tap' | awk '{print $1}'`
TAP=""
LOCKFILE=""
for tap in $POSSIBLE; do
    LOCKFILE="$LOCKDIR/$tap"
    echo "Acquiring lockfile for $tap..."
    acquire_lock $LOCKFILE
    if [ $? -eq 0 ]; then
        TAP=$tap
        break
    fi
done

if [ "$TAP" = "" ]; then
    if [ -e "$NOSUDO_FLAG" ]; then
        echo "Error: There are no available tap devices to use for networking,"
        echo "and I see $NOSUDO_FLAG exists, so I am not going to try creating"
        echo "a new one with sudo."
        exit 1
    fi

    GROUPID=`id -g`
    echo "Setting up tap interface under sudo"
    tap=`sudo $QEMUIFUP $GROUPID $POKY_NATIVE_SYSROOT`
    if [ $? -ne 0 ]; then
        # Re-run standalone to see verbose errors
        sudo $QEMUIFUP $GROUPID $POKY_NATIVE_SYSROOT
        return
    fi
    LOCKFILE="$LOCKDIR/$tap"
    echo "Acquiring lockfile for $tap..."
    acquire_lock $LOCKFILE
    if [ $? -eq 0 ]; then
        TAP=$tap
    fi 
else
    echo "Using preconfigured tap device '$TAP'"
fi

cleanup() {
    if [ ! -e "$NOSUDO_FLAG" ]; then
        sudo $QEMUIFDOWN $TAP $POKY_NATIVE_SYSROOT
    fi
    echo "Releasing lockfile of preconfigured tap device '$TAP'"
    release_lock $LOCKFILE

    if [ "$NFSRUNNING" = "true" ]; then
        echo "Shutting down the userspace NFS server..."
        echo "poky-export-rootfs stop $ROOTFS"
        poky-export-rootfs stop $ROOTFS
    fi
}

n1=$[ (`echo $TAP | sed 's/tap//'` * 2) + 1 ]
n2=$[ (`echo $TAP | sed 's/tap//'` * 2) + 2 ]

KERNEL_NETWORK_CMD="ip=192.168.7.$n2::192.168.7.$n1:255.255.255.0"
QEMU_TAP_CMD="-net tap,vlan=0,ifname=$TAP,script=no,downscript=no"
QEMU_NETWORK_CMD="-net nic,vlan=0 $QEMU_TAP_CMD"
KERNCMDLINE="mem=$QEMU_MEMORY"
QEMU_UI_OPTIONS="-show-cursor -usb -usbdevice wacom-tablet"

NFS_INSTANCE=`echo $TAP | sed 's/tap//'`
export NFS_INSTANCE

SERIALOPTS=""
if [ "x$SERIAL_LOGFILE" != "x" ]; then
    SERIALOPTS="-serial file:$SERIAL_LOGFILE"
fi

case "$MACHINE" in
    "qemuarm") ;;
    "qemumips") ;;
    "qemuppc") ;;
    "qemuarmv6") ;;
    "qemuarmv7") ;;
    "qemux86") ;;
    "qemux86-64") ;;
    "akita") ;;
    "spitz") ;;
    *)
        echo "Error: Unsupported machine type $MACHINE"
        return
    ;;
esac

if [ ! -f "$KERNEL" ]; then
    echo "Error: Kernel image file $KERNEL doesn't exist"
    cleanup
    return
fi

if [ "$FSTYPE" != "nfs" -a ! -f "$ROOTFS" ]; then
    echo "Error: Image file $ROOTFS doesn't exist"
    cleanup
    return
fi

if [ "$FSTYPE" = "nfs" ]; then
    NFS_SERVER="192.168.7.1"
    NFS_DIR=`echo $ROOTFS | sed 's/^[^:]*:\(.*\)/\1/'`
    MOUNTD_PORT=$[ 21111 + $NFS_INSTANCE ]
    NFSD_PORT=$[ 11111 + $NFS_INSTANCE ]
    UNFS_OPTS="nfsvers=2,mountprog=$MOUNTD_PORT,nfsprog=$NFSD_PORT,udp"

    PSEUDO_LOCALSTATEDIR=~/.poky-sdk/pseudo
    export PSEUDO_LOCALSTATEDIR

    rpcbind_running=`ps ax | grep rpcbind | grep -v grep | wc -l`
    portmap_running=`ps ax | grep portmap | grep -v grep | wc -l`
    if [[ $rpcbind_running == 0 && $portmap_running == 0 ]]; then
        echo "You need to be running either rpcbind or portmap to continue"
        cleanup
        return
    fi

    # Start the userspace NFS server
    echo "poky-export-rootfs restart $ROOTFS"
    poky-export-rootfs restart $ROOTFS
    if [ $? != 0 ]; then
        cleanup
        return
    fi
    NFSRUNNING="true"
fi

if [ "$NFS_SERVER" = "" ]; then
    NFS_SERVER="192.168.7.1"
    NFS_DIR=$ROOTFS
fi

if [ "$MACHINE" = "qemuarm" -o "$MACHINE" = "qemuarmv6" -o "$MACHINE" = "qemuarmv7" ]; then
    if [ -e /proc/sys/vm/mmap_min_addr ]; then
        if [ `cat /proc/sys/vm/mmap_min_addr` != "0" ]; then
            echo "Error, please set /proc/sys/vm/mmap_min_addr to 0 since otherwise it can cause problems with QEMU"
            return
        fi
    fi

    QEMU=qemu-system-arm
    MACHINE_SUBTYPE=versatilepb
    QEMU_UI_OPTIONS="$QEMU_UI_OPTIONS"
    # QEMU_UI_OPTIONS="$QEMU_UI_OPTIONS -force-pointer"
    if [ "$FSTYPE" = "ext3" ]; then
        KERNCMDLINE="root=/dev/sda console=ttyAMA0,115200 console=tty $KERNEL_NETWORK_CMD mem=$QEMU_MEMORY highres=off"
        QEMUOPTIONS="$QEMU_NETWORK_CMD -M versatilepb -hda $ROOTFS -no-reboot $QEMU_UI_OPTIONS"
    fi
    if [ "$FSTYPE" = "nfs" ]; then
        if [ "$NFS_SERVER" = "192.168.7.1" -a ! -d "$NFS_DIR" ]; then
            echo "Error: NFS mount point $ROOTFS doesn't exist"
            cleanup
            return
        fi
        KERNCMDLINE="root=/dev/nfs nfsroot=$NFS_SERVER:$NFS_DIR,$UNFS_OPTS rw $KERNEL_NETWORK_CMD mem=$QEMU_MEMORY"
        QEMUOPTIONS="$QEMU_NETWORK_CMD -M versatilepb --no-reboot $QEMU_UI_OPTIONS"
    fi
    if [ "$MACHINE" = "qemuarmv6" ]; then
        QEMUOPTIONS="$QEMUOPTIONS -cpu arm1136"
    fi
    if [ "$MACHINE" = "qemuarmv7" ]; then
        QEMUOPTIONS="$QEMUOPTIONS -cpu cortex-a8"
    fi
fi

if [ "$MACHINE" = "qemux86" ]; then
    QEMU=qemu
    QEMU_UI_OPTIONS="$QEMU_UI_OPTIONS -vga vmware -enable-gl"
    if [ "$FSTYPE" = "ext3" ]; then
        KERNCMDLINE="vga=0 root=/dev/hda mem=$QEMU_MEMORY $KERNEL_NETWORK_CMD"
        QEMUOPTIONS="$QEMU_NETWORK_CMD -hda $ROOTFS $QEMU_UI_OPTIONS"
    fi
    if [ "$FSTYPE" = "nfs" ]; then
        if [ "$NFS_SERVER" = "192.168.7.1" -a ! -d "$NFS_DIR" ]; then
            echo "Error: NFS mount point $ROOTFS doesn't exist."
            cleanup
            return
        fi
        KERNCMDLINE="root=/dev/nfs nfsroot=$NFS_SERVER:$NFS_DIR,$UNFS_OPTS rw $KERNEL_NETWORK_CMD mem=$QEMU_MEMORY"
        QEMUOPTIONS="$QEMU_NETWORK_CMD $QEMU_UI_OPTIONS"
    fi
fi

if [ "$MACHINE" = "qemux86-64" ]; then
    QEMU=qemu-system-x86_64
    QEMU_UI_OPTIONS="$QEMU_UI_OPTIONS -vga vmware -enable-gl"
    if [ "$FSTYPE" = "ext3" ]; then
        KERNCMDLINE="vga=0 root=/dev/hda mem=$QEMU_MEMORY $KERNEL_NETWORK_CMD"
        QEMUOPTIONS="$QEMU_NETWORK_CMD -hda $ROOTFS $QEMU_UI_OPTIONS"
    fi
    if [ "$FSTYPE" = "nfs" ]; then
        if [ "x$ROOTFS" = "x" ]; then
            ROOTFS=/srv/nfs/qemux86-64
        fi
        if [ ! -d "$ROOTFS" ]; then
            echo "Error: NFS mount point $ROOTFS doesn't exist."
            cleanup
            return
        fi
        KERNCMDLINE="root=/dev/nfs nfsroot=$NFS_SERVER:$NFS_DIR,$UNFS_OPTS rw $KERNEL_NETWORK_CMD mem=$QEMU_MEMORY"
        QEMUOPTIONS="$QEMU_NETWORK_CMD $QEMU_UI_OPTIONS"
    fi
fi

if [ "$MACHINE" = "spitz" ]; then
    QEMU=qemu-system-arm
    if [ "$FSTYPE" = "ext3" ]; then
        echo $ROOTFS
        ROOTFS=`readlink -f $ROOTFS`
        echo $ROOTFS
        if [ ! -e "$ROOTFS.qemudisk" ]; then
            echo "Adding a partition table to the ext3 image for use by QEMU, please wait..."
            poky-addptable2image $ROOTFS $ROOTFS.qemudisk
        fi
        QEMUOPTIONS="$QEMU_NETWORK_CMD -M spitz -hda $ROOTFS.qemudisk -portrait"
    fi
fi

if [ "$MACHINE" = "qemumips" ]; then
    QEMU=qemu-system-mips
    MACHINE_SUBTYPE=malta
    QEMU_UI_OPTIONS="-vga cirrus"
    if [ "$FSTYPE" = "ext3" ]; then
        #KERNCMDLINE="root=/dev/hda console=ttyS0 console=tty0 $KERNEL_NETWORK_CMD mem=$QEMU_MEMORY"
        KERNCMDLINE="root=/dev/hda console=ttyS0 console=tty $KERNEL_NETWORK_CMD mem=$QEMU_MEMORY"
        QEMUOPTIONS="$QEMU_NETWORK_CMD -M $MACHINE_SUBTYPE -hda $ROOTFS -no-reboot $QEMU_UI_OPTIONS"
    fi
    if [ "$FSTYPE" = "nfs" ]; then
        if [ "$NFS_SERVER" = "192.168.7.1" -a ! -d "$NFS_DIR" ]; then
            echo "Error: NFS mount point $ROOTFS doesn't exist"
            cleanup
            return
        fi
        KERNCMDLINE="root=/dev/nfs console=ttyS0 console=tty nfsroot=$NFS_SERVER:$NFS_DIR,$UNFS_OPTS rw $KERNEL_NETWORK_CMD mem=$QEMU_MEMORY"
        QEMUOPTIONS="$QEMU_NETWORK_CMD -M $MACHINE_SUBTYPE -no-reboot $QEMU_UI_OPTIONS"
    fi
fi

if [ "$MACHINE" = "qemuppc" ]; then
    QEMU=qemu-system-ppc
    MACHINE_SUBTYPE=prep
    CPU_SUBTYPE=603e
    BIOS=powerpc_rom.bin
    QEMU_UI_OPTIONS="$QEMU_UI_OPTIONS -nographic"
    if [ "$FSTYPE" = "ext3" ]; then
        KERNCMDLINE="root=/dev/hda console=ttyS0 console=tty0 $KERNEL_NETWORK_CMD mem=$QEMU_MEMORY"
        QEMUOPTIONS="$QEMU_NETWORK_CMD -cpu $CPU_SUBTYPE -M $MACHINE_SUBTYPE -bios $BIOS -hda $ROOTFS -no-reboot $QEMU_UI_OPTIONS"
    fi
    if [ "$FSTYPE" = "nfs" ]; then
        if [ "$NFS_SERVER" = "192.168.7.1" -a ! -d "$NFS_DIR" ]; then
            echo "Error: NFS mount point $ROOTFS doesn't exist"
            cleanup
            return
        fi
        KERNCMDLINE="root=/dev/nfs console=ttyS0 console=tty0 nfsroot=$NFS_SERVER:$NFS_DIR,$UNFS_OPTS rw $KERNEL_NETWORK_CMD mem=$QEMU_MEMORY"
        QEMUOPTIONS="$QEMU_NETWORK_CMD -cpu $CPU_SUBTYPE -M $MACHINE_SUBTYPE -bios $BIOS -no-reboot $QEMU_UI_OPTIONS"
    fi
fi

if [ "$MACHINE" = "akita" ]; then
    QEMU=qemu-system-arm
    if [ "$FSTYPE" = "jffs2" ]; then
        ROOTFS=`readlink -f $ROOTFS`
        if [ ! -e "$ROOTFS.qemuflash" ]; then
            echo "Converting raw image into flash image format for use by QEMU, please wait..."
        raw2flash.akita < $ROOTFS > $ROOTFS.qemuflash
        fi
        QEMUOPTIONS="$QEMU_NETWORK_CMD -M akita -mtdblock $ROOTFS.qemuflash -portrait"
    fi
fi

if [ "x$QEMUOPTIONS" = "x" ]; then
    echo "Error: Unable to support this combination of options"
    cleanup
    return
fi

SDKDIR="/opt/poky/sysroots"
if [ "$MACHINE" = "qemuarm" -o "$MACHINE" = "spitz" -o "$MACHINE" = "borzoi" -o "$MACHINE" = "akita" -o "$MACHINE" = "nokia800" ]; then
    SDKPATH="$SDKDIR/arm-poky-linux-gnueabi/bin"
fi

if [ "$MACHINE" = "qemux86" ]; then
    SDKPATH="$SDKDIR/i586-poky-linux/bin"
fi

if [ "$MACHINE" = "qemux86-64" ]; then
    SDKPATH="$SDKDIR/x86_64-poky-linux/bin"
fi

PATH=$CROSSPATH:$SDKPATH:$PATH

QEMUBIN=`which $QEMU`

if [ ! -x "$QEMUBIN" ]; then
    echo "Error: No QEMU binary '$QEMU' could be found."
    cleanup
    return
fi

function _quit() {
    if [ -n "$PIDFILE" ]; then
        #echo kill `cat $PIDFILE`
        kill `cat $PIDFILE`
    fi
    cleanup
    return
}

DISTCCD=`which distccd`
PIDFILE=""

trap _quit INT TERM QUIT

if [ -x "$DISTCCD" ]; then
    echo "Starting distccd..."
    PIDFILE=`mktemp`
    $DISTCCD --allow 192.168.7.2 --daemon --pid-file $PIDFILE &
else
    echo "Warning: distccd not present, no distcc support loaded."
fi

echo "Running $QEMU..."
echo $QEMUBIN -kernel $KERNEL $QEMUOPTIONS $SERIALOPTS $SCRIPT_QEMU_CMDLINE_OPT --append '"'$KERNCMDLINE $SCRIPT_KERNEL_OPT'"'
$QEMUBIN -kernel $KERNEL $QEMUOPTIONS $SERIALOPTS $SCRIPT_QEMU_OPT --append "$KERNCMDLINE $SCRIPT_KERNEL_OPT" || /bin/true

cleanup

trap - INT TERM QUIT
return