Refactor QemuCommand class into its own file/module.

1 files changed, 118 insertions, 0 deletions

diff --git a/scripts/qemucommand.py b/scripts/qemucommand.py
new file mode 100644
index 0000000..ed14d9b
--- /dev/null
+++ b/scripts/qemucommand.py
@@ -0,0 +1,118 @@
+from os.path import exists, join, realpath
+from os import listdir
+import random
+import socket
+
+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 = 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)
+        self.kvm = not args.no_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
+
+