from os.path import exists, join, realpath, abspath from os import listdir import random import socket from subprocess import check_output, CalledProcessError EXTENSIONS = { 'intel-corei7-64': 'wic', 'qemux86-64': 'otaimg' } def find_local_port(start_port): """" Find the next free TCP port after 'start_port'. """ for port in range(start_port, start_port + 10): try: s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.bind(('', port)) return port except socket.error: print("Skipping port %d" % port) finally: s.close() raise Exception("Could not find a free TCP port") def random_mac(): """Return a random Ethernet MAC address @link https://www.iana.org/assignments/ethernet-numbers/ethernet-numbers.xhtml#ethernet-numbers-2 """ head = "ca:fe:" hex_digits = '0123456789abcdef' tail = ':'.join([random.choice(hex_digits) + random.choice(hex_digits) for _ in range(4)]) return head + tail class QemuCommand(object): def __init__(self, args): if args.machine: self.machine = args.machine else: machines = listdir(args.dir) if len(machines) == 1: self.machine = machines[0] else: raise ValueError("Could not autodetect machine type from %s" % args.dir) if args.efi: self.bios = 'OVMF.fd' else: uboot = abspath(join(args.dir, self.machine, 'u-boot-qemux86-64.rom')) if not exists(uboot): raise ValueError("U-Boot image %s does not exist" % uboot) self.bios = uboot if exists(args.imagename): image = args.imagename else: ext = EXTENSIONS.get(self.machine, 'wic') image = join(args.dir, self.machine, '%s-%s.%s' % (args.imagename, self.machine, ext)) self.image = realpath(image) if not exists(self.image): raise ValueError("OS image %s does not exist" % self.image) if args.mac: self.mac_address = args.mac else: self.mac_address = random_mac() self.serial_port = find_local_port(8990) self.ssh_port = find_local_port(2222) if args.kvm is None: # Autodetect KVM using 'kvm-ok' try: check_output(['kvm-ok']) self.kvm = True except CalledProcessError: self.kvm = False else: self.kvm = args.kvm self.gui = not args.no_gui self.gdb = args.gdb self.pcap = args.pcap self.overlay = args.overlay def command_line(self): netuser = 'user,hostfwd=tcp:0.0.0.0:%d-:22,restrict=off' % self.ssh_port if self.gdb: netuser += ',hostfwd=tcp:0.0.0.0:2159-:2159' cmdline = [ "qemu-system-x86_64", "-bios", self.bios ] if not self.overlay: cmdline += ["-drive", "file=%s,if=ide,format=raw,snapshot=on" % self.image] cmdline += [ "-serial", "tcp:127.0.0.1:%d,server,nowait" % self.serial_port, "-m", "1G", "-usb", "-usbdevice", "tablet", "-show-cursor", "-vga", "std", "-net", netuser, "-net", "nic,macaddr=%s" % self.mac_address ] if self.pcap: cmdline += ['-net', 'dump,file=' + self.pcap] if self.gui: cmdline += ["-serial", "stdio"] else: cmdline.append('-nographic') if self.kvm: cmdline.append('-enable-kvm') else: cmdline += ['-cpu', 'Haswell'] if self.overlay: cmdline.append(self.overlay) return cmdline def img_command_line(self): cmdline = [ "qemu-img", "create", "-o", "backing_file=%s" % self.image, "-f", "qcow2", self.overlay] return cmdline