8e51bdb10d
Looking at https://lwn.net/Articles/658511/, this seems like it should be reasonably harmless as a simple test of whether we can expect `/dev/kvm` to work. Fixes #4
110 lines
2.6 KiB
Bash
Executable File
110 lines
2.6 KiB
Bash
Executable File
#!/bin/bash
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set -e
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# main available options:
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# QEMU_CPU=n (cores)
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# QEMU_RAM=nnn (megabytes)
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# QEMU_HDA (filename)
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# QEMU_HDA_SIZE (bytes, suffixes like "G" allowed)
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# QEMU_CDROM (filename)
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# QEMU_BOOT (-boot)
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# QEMU_PORTS="xxx[ xxx ...]" (space separated port numbers)
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# QEMU_NET_USER_EXTRA="net=192.168.76.0/24,dhcpstart=192.168.76.9" (extra raw args for "-net user,...")
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# QEMU_NO_SSH=1 (suppress automatic port 22 forwarding)
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# QEMU_NO_SERIAL=1 (suppress automatic "-serial stdio")
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# QEMU_NO_VNC=1 (suppress automatic "-vnc ':0'")
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hostArch="$(uname -m)"
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qemuArch="${QEMU_ARCH:-$hostArch}"
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qemu="${QEMU_BIN:-qemu-system-$qemuArch}"
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qemuArgs=()
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qemuPorts=()
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if [ -z "${QEMU_NO_SSH:-}" ]; then
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qemuPorts+=( 22 )
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fi
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qemuPorts+=( ${QEMU_PORTS:-} )
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if [ -e /dev/kvm ] && sh -c 'echo -n > /dev/kvm' &> /dev/null; then
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# https://github.com/tianon/docker-qemu/issues/4
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qemuArgs+=( -enable-kvm )
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elif [ "$hostArch" = "$qemuArch" ]; then
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echo >&2
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echo >&2 'warning: /dev/kvm not found'
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echo >&2 ' PERFORMANCE WILL SUFFER'
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echo >&2 ' (hint: docker run --device /dev/kvm ...)'
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echo >&2
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sleep 3
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fi
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qemuArgs+=( -smp "${QEMU_CPU:-1}" )
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qemuArgs+=( -m "${QEMU_RAM:-512}" )
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if [ -n "${QEMU_HDA:-}" ]; then
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if [ ! -f "$QEMU_HDA" -o ! -s "$QEMU_HDA" ]; then
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(
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set -x
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qemu-img create -f qcow2 -o preallocation=off "$QEMU_HDA" "${QEMU_HDA_SIZE:-8G}"
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)
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fi
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# http://wiki.qemu.org/download/qemu-doc.html#Invocation
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qemuScsiDevice='virtio-scsi-pci'
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case "$qemuArch" in
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arm | riscv64) qemuScsiDevice='virtio-scsi-device' ;;
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esac
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#qemuArgs+=( -hda "$QEMU_HDA" )
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#qemuArgs+=( -drive file="$QEMU_HDA",index=0,media=disk,discard=unmap )
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qemuArgs+=(
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-drive file="$QEMU_HDA",index=0,media=disk,discard=unmap,detect-zeroes=unmap,if=none,id=hda
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-device "$qemuScsiDevice"
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-device scsi-hd,drive=hda
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)
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fi
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if [ -n "${QEMU_CDROM:-}" ]; then
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qemuArgs+=( -cdrom "$QEMU_CDROM" )
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fi
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if [ -n "${QEMU_BOOT:-}" ]; then
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qemuArgs+=( -boot "$QEMU_BOOT" )
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fi
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netArg='user'
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netArg+=",hostname=$(hostname)"
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if [ -n "${QEMU_NET_USER_EXTRA:-}" ]; then
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netArg+=",$QEMU_NET_USER_EXTRA"
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fi
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for port in "${qemuPorts[@]}"; do
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netArg+=",hostfwd=tcp::$port-:$port"
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netArg+=",hostfwd=udp::$port-:$port"
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done
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qemuNetDevice='virtio-net-pci'
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case "$qemuArch" in
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arm | riscv64) qemuNetDevice='virtio-net-device' ;;
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esac
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qemuArgs+=(
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-netdev "$netArg,id=net"
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-device "$qemuNetDevice,netdev=net"
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)
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if [ -z "${QEMU_NO_SERIAL:-}" ]; then
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qemuArgs+=(
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-serial stdio
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)
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fi
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if [ -z "${QEMU_NO_VNC:-}" ]; then
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qemuArgs+=(
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-vnc ':0'
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)
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fi
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qemuArgs+=( "$@" )
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set -x
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exec "$qemu" "${qemuArgs[@]}"
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