cross 0.1.15-dev

Zero setup cross compilation and cross testing
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#!/bin/bash

set -e

LOG=/tmp/qemu.log
LOCK=/tmp/qemu.lock

if [ -n "$CROSS_DEBUG" ]; then
    set -x
fi

# arch in the rust target
arch=$1
shift

# select qemu arch
qarch=$arch
case "$arch" in
    armv7)
        qarch="arm"
        ;;
    i686)
        qarch="i386"
        ;;
    powerpc)
        qarch="ppc"
        ;;
    powerpc64)
        qarch="ppc64"
        ;;
    powerpc64le)
        if [ "$CROSS_RUNNER" = "qemu-user" ]; then
            qarch="ppc64le"
        else
            qarch="ppc64"
        fi
        ;;
esac

case "$CROSS_RUNNER" in
    native)
        exec "${@}"
        ;;
    qemu-user | "")
        exec qemu-$qarch "${@}"
        ;;
    qemu-system)
        true
        ;;
    *)
        echo "Invalid runner: \"$CROSS_RUNNER\"";
        echo "Valid runners are: native, qemu-user and qemu-system"
        exit 1
        ;;
esac

n=$(nproc)
memory=1G
driver9p="virtio-9p-pci"
drivernet="virtio-net-pci"

# select qemu parameters
case "$arch" in
    aarch64)
        # 8 is the max number of cpu supported by qemu-aarch64
        n=$(( n > 8 ? 8 : n ))
        opt="-machine virt -cpu cortex-a57"
        ;;
    armv7)
        opt="-machine virt"
        driver9p="virtio-9p-device"
        drivernet="virtio-net-device"
        ;;
    i686)
        opt="-append console=ttyS0"
        ;;
    mips|mipsel)
        # avoid kernel error
        # https://blahcat.github.io/2017/07/14/building-a-debian-stretch-qemu-image-for-mipsel/
        opt="-append nokaslr"
        n=1
        ;;
    mips64el)
        # avoid kernel error
        # https://blahcat.github.io/2017/07/14/building-a-debian-stretch-qemu-image-for-mipsel/
        opt="-append nokaslr -cpu MIPS64R2-generic"
        n=1
        ;;
    powerpc)
        opt="-append console=ttyPZ0"
        n=1
        ;;
    powerpc64|powerpc64le)
        opt="-append console=hvc0 --nodefaults -serial stdio"
        ;;
    s390x)
        n=1
        driver9p="virtio-9p-ccw"
        drivernet="virtio-net-ccw"
        ;;
    sparc64)
        n=1
        driver9p+=",bus=pciB"
        drivernet+=",bus=pciB"
        ;;
    x86_64)
        opt="-append console=ttyS0"
        ;;
esac

(
    flock -n 200 || exit 0

    echo Booting QEMU virtual machine with $n cpus...

    QEMU_CMD="qemu-system-$qarch \
        -m $memory \
        -smp $n \
        -nographic \
        -monitor none \
        -netdev user,id=net0,hostfwd=tcp::10022-:22 \
        -device $drivernet,netdev=net0 \
        -kernel /qemu/kernel \
        -initrd /qemu/initrd.gz \
        $opt \
        -fsdev local,id=fs0,path=/target,security_model=mapped \
        -device $driver9p,fsdev=fs0,mount_tag=target"

    touch $LOG
    if [ -n "$CROSS_DEBUG" ]; then
        ($QEMU_CMD 2>&1 | tee -a $LOG) &
    else
        $QEMU_CMD 2>&1 >> $LOG &
    fi

    # wait for dropbear
    for i in $(seq 240); do
        if grep -q "Not backgrounding" $LOG; then
            READY=1
            break
        fi
        sleep 0.5s
    done

    if [ -z "$READY" ]; then
        if [ -n "$CROSS_DEBUG" ]; then
            echo "Not ready but continuing because CROSS_DEBUG is set"
        else
            echo "Qemu is not ready..."
            echo "Set the environment variable CROSS_DEBUG=1 to debug"
            exit 1
        fi
    fi

    echo Booted in $SECONDS seconds

) 200>$LOCK

if [ -t 1 ] && [ -t 2]; then
  tty_flag='-t'
fi

exec dbclient ${tty_flag} -p 10022 -y -y root@localhost "${@}"