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#!/usr/bin/env python3
import argparse
import re
import serial
import os
import shutil
import subprocess
import sys
import time
parser = argparse.ArgumentParser(
description="Connect to serial console to execute stuff",
formatter_class=argparse.ArgumentDefaultsHelpFormatter,
)
parser.add_argument(
"--qemu-log",
dest="qemu_log",
required=True,
help="QEMU log to look for serial port info in",
)
parser.add_argument(
"--hostname", default="trixie", help="hostname of the system for login process"
)
parser.add_argument("--user", default="root", help="user name to use for login")
parser.add_argument("--password", default="grml", help="password for login")
parser.add_argument(
"--timeout",
default="180",
type=int,
help="Maximum time for finding the login prompt, in seconds",
)
parser.add_argument(
"--screenshot",
default="screenshot.jpg",
help="file name for screenshot captured via VNC on error",
)
parser.add_argument(
"--tries",
default="12",
type=int,
help="Number of retries for finding the login prompt",
)
parser.add_argument(
"--poweroff",
action="store_true",
default=False,
help='send "poweroff" command after all other commands',
)
parser.add_argument("command", nargs="+", help="command to execute after logging in")
def print_ser_lines(ser):
for line in ser.readlines():
print("<<", line) # line will be a binary string
def write_ser_line(ser, text):
print(">>", text)
ser.write(("%s\n" % text).encode())
ser.flush()
def wait_ser_text(ser, texts, timeout):
if isinstance(texts, str):
texts = [texts]
ts_max = time.time() + timeout
ser.timeout = 1
texts_encoded = [text.encode("utf-8") for text in texts]
found = False
print(time.time(), "D: expecting one of", texts_encoded)
while ts_max > time.time() and found is False:
for line in ser.readlines():
print(time.time(), "<<", line) # line will be a binary string
for index, text in enumerate(texts_encoded):
if text in line:
found = texts[index]
break
return found
def login(ser, hostname, user, password, timeout):
login_prompt = "%s login:" % hostname
shell_prompt = "%s@%s" % (user, hostname)
write_ser_line(ser, "") # send newline
found = wait_ser_text(ser, [shell_prompt, login_prompt], timeout=timeout * 4)
if found == shell_prompt:
return
elif found is False:
raise ValueError("timeout waiting for login prompt")
print("Logging in...")
write_ser_line(ser, user)
if not wait_ser_text(ser, "Password:", timeout=timeout):
raise ValueError("timeout waiting for password prompt")
write_ser_line(ser, password)
time.sleep(1)
print(time.time(), "Waiting for shell prompt...")
if not wait_ser_text(ser, shell_prompt, timeout=timeout * 4):
raise ValueError("timeout waiting for shell prompt")
def capture_vnc_screenshot(screenshot_file):
if not shutil.which("vncsnapshot"):
print("WARN: vncsnapshot not available, skipping vnc snapshot capturing.")
return
print("Trying to capture screenshot via vncsnapshot to", screenshot_file)
proc = subprocess.Popen(["vncsnapshot", "localhost", screenshot_file])
proc.wait()
if proc.returncode != 0:
print("WARN: failed to capture vnc snapshot :(")
else:
print("Screenshot file '%s' available" % os.path.abspath(screenshot_file))
def find_serial_port_from_qemu_log(qemu_log, tries):
port = None
for i in range(tries):
print("Waiting for qemu to present serial console [try %s]" % (i, ))
with open(qemu_log, "r", encoding="utf-8") as fp:
qemu_log_messages = fp.read().splitlines()
for line in qemu_log_messages:
m = re.match("char device redirected to ([^ ]+)", line)
if m:
port = m.group(1)
break
if port:
break
time.sleep(5)
print("qemu log (up to char device redirect) follows:")
print("\n".join(qemu_log_messages))
print()
return port # might be None, caller has to deal with it
def main():
args = parser.parse_args()
hostname = args.hostname
password = args.password
qemu_log = args.qemu_log
user = args.user
commands = args.command
screenshot_file = args.screenshot
port = find_serial_port_from_qemu_log(qemu_log, args.tries)
if not port:
print()
print("E: no serial port found in qemu log", qemu_log)
sys.exit(1)
ser = serial.Serial(port, 115200)
ser.flushInput()
ser.flushOutput()
success = False
ts_start = time.time()
for i in range(args.tries):
try:
print("Logging into %s via serial console [try %s]" % (port, i))
login(ser, hostname, user, password, 30)
success = True
break
except Exception as except_inst:
print("Login failure (try %s):" % (i,), except_inst)
time.sleep(5)
if time.time() - ts_start > args.timeout:
print("E: Timeout reached waiting for login prompt")
break
if success:
write_ser_line(ser, "")
ser.timeout = 30
print_ser_lines(ser)
print("Running commands...")
for command in commands:
write_ser_line(ser, command)
print_ser_lines(ser)
if args.poweroff:
print("Sending final poweroff command...")
write_ser_line(ser, "poweroff")
ser.flush()
# after poweroff, the serial device will probably vanish. do not attempt reading from it anymore.
if not success:
print("W: Running tests failed, saving screenshot")
capture_vnc_screenshot(screenshot_file)
sys.exit(1)
if __name__ == "__main__":
main()
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