qemush/qemu/launchers/kvm

#!/usr/bin/env sh
# What processor architecture to use
[ -z "$QEMUSH_ARCH" ] && QEMUSH_ARCH=$(uname -m)

# What machine type to use
[ -z "$QEMUSH_MACHINE" ] && case "$QEMUSH_ARCH" in
    x86_64)
        QEMUSH_MACHINE=q35
        ;;
esac

# How many CPU cores to use
[ -z "$QEMUSH_NPROC" ] && QEMUSH_NPROC=$(($(nproc) / 2))

# How much RAM to use
[ -z "$QEMUSH_RAM" ] && QEMUSH_RAM=$(($(grep '^MemAvailable:\s' /proc/meminfo | awk '{ print $2 }') / 2))K

# Use selected QEMUSH_MACHINE type if set
[ -n "$QEMUSH_MACHINE" ] && set -- -M "$QEMUSH_MACHINE" "$@"

# Set the arguments
set -- "qemu-system-${QEMUSH_ARCH}" \
    -enable-kvm \
    -cpu host -smp "$QEMUSH_NPROC" \
    -m "$QEMUSH_RAM" \
    "$@"

# Start the machine
set -x
exec "$@"