import pexpect
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import infra
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class Emulator(object):
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def __init__(self, builddir, downloaddir, logtofile, timeout_multiplier):
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self.qemu = None
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self.downloaddir = downloaddir
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self.logfile = infra.open_log_file(builddir, "run", logtofile)
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# We use elastic runners on the cloud to runs our tests. Those runners
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# can take a long time to run the emulator. Use a timeout multiplier
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# when running the tests to avoid sporadic failures.
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self.timeout_multiplier = timeout_multiplier
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# Start Qemu to boot the system
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#
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# arch: Qemu architecture to use
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#
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# kernel: path to the kernel image, or the special string
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# 'builtin'. 'builtin' means a pre-built kernel image will be
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# downloaded from ARTEFACTS_URL and suitable options are
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# automatically passed to qemu and added to the kernel cmdline. So
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# far only armv5, armv7 and i386 builtin kernels are available.
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# If None, then no kernel is used, and we assume a bootable device
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# will be specified.
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#
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# kernel_cmdline: array of kernel arguments to pass to Qemu -append option
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#
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# options: array of command line options to pass to Qemu
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#
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def boot(self, arch, kernel=None, kernel_cmdline=None, options=None):
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if arch in ["armv7", "armv5"]:
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qemu_arch = "arm"
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else:
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qemu_arch = arch
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qemu_cmd = ["qemu-system-{}".format(qemu_arch),
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"-serial", "stdio",
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"-display", "none"]
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if options:
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qemu_cmd += options
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if kernel_cmdline is None:
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kernel_cmdline = []
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if kernel:
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if kernel == "builtin":
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if arch in ["armv7", "armv5"]:
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kernel_cmdline.append("console=ttyAMA0")
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if arch == "armv7":
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kernel = infra.download(self.downloaddir,
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"kernel-vexpress")
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dtb = infra.download(self.downloaddir,
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"vexpress-v2p-ca9.dtb")
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qemu_cmd += ["-dtb", dtb]
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qemu_cmd += ["-M", "vexpress-a9"]
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elif arch == "armv5":
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kernel = infra.download(self.downloaddir,
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"kernel-versatile")
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qemu_cmd += ["-M", "versatilepb"]
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qemu_cmd += ["-kernel", kernel]
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if kernel_cmdline:
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qemu_cmd += ["-append", " ".join(kernel_cmdline)]
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self.logfile.write("> starting qemu with '%s'\n" % " ".join(qemu_cmd))
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self.qemu = pexpect.spawn(qemu_cmd[0], qemu_cmd[1:],
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timeout=5 * self.timeout_multiplier,
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env={"QEMU_AUDIO_DRV": "none"})
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# We want only stdout into the log to avoid double echo
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self.qemu.logfile_read = self.logfile
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# Wait for the login prompt to appear, and then login as root with
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# the provided password, or no password if not specified.
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def login(self, password=None):
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# The login prompt can take some time to appear when running multiple
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# instances in parallel, so set the timeout to a large value
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index = self.qemu.expect(["buildroot login:", pexpect.TIMEOUT],
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timeout=60 * self.timeout_multiplier)
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if index != 0:
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self.logfile.write("==> System does not boot")
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raise SystemError("System does not boot")
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self.qemu.sendline("root")
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if password:
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self.qemu.expect("Password:")
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self.qemu.sendline(password)
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index = self.qemu.expect(["# ", pexpect.TIMEOUT])
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if index != 0:
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raise SystemError("Cannot login")
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self.run("dmesg -n 1")
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# Run the given 'cmd' with a 'timeout' on the target
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# return a tuple (output, exit_code)
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def run(self, cmd, timeout=-1):
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self.qemu.sendline(cmd)
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if timeout != -1:
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timeout *= self.timeout_multiplier
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self.qemu.expect("# ", timeout=timeout)
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# Remove double carriage return from qemu stdout so str.splitlines()
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# works as expected.
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output = self.qemu.before.replace("\r\r", "\r").splitlines()[1:]
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self.qemu.sendline("echo $?")
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self.qemu.expect("# ")
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exit_code = self.qemu.before.splitlines()[2]
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exit_code = int(exit_code)
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return output, exit_code
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def stop(self):
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if self.qemu is None:
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return
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self.qemu.terminate(force=True)
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