65 lines
2.8 KiB
Python
65 lines
2.8 KiB
Python
|
#!/usr/bin/env python3
|
||
|
|
"""Reboot the HTPC as soon as an SSH window opens, then confirm it came back.
|
||
|
|
|
||
|
|
Proof of reboot is a changed kernel boot_id, not the SSH session dropping --
|
||
|
|
on this link a dropped session is the normal case and proves nothing.
|
||
|
|
"""
|
||
|
|
import os, subprocess, sys, time
|
||
|
|
sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
|
||
|
|
from suvi import gpubox
|
||
|
|
|
||
|
|
def ssh(command, stdin=None, timeout=40):
|
||
|
|
try:
|
||
|
|
r = subprocess.run(gpubox.ssh_argv() + [command], input=stdin,
|
||
|
|
stdout=subprocess.PIPE, stderr=subprocess.STDOUT, timeout=timeout)
|
||
|
|
return r.returncode, r.stdout.decode(errors="replace")
|
||
|
|
except subprocess.TimeoutExpired:
|
||
|
|
return -1, "timeout"
|
||
|
|
|
||
|
|
def log(msg):
|
||
|
|
print(f"[{time.strftime('%H:%M:%S')}] {msg}", flush=True)
|
||
|
|
|
||
|
|
# 1. Wait for a window, capture boot_id and issue the reboot in the same round trip.
|
||
|
|
# Polkit usually refuses reboot from an SSH session while a desktop session is
|
||
|
|
# open, so fall back to sudo with the password on stdin (never on the command line).
|
||
|
|
before = None
|
||
|
|
for attempt in range(1, 361):
|
||
|
|
code, out = ssh("echo BOOT=$(cat /proc/sys/kernel/random/boot_id); "
|
||
|
|
"systemctl reboot --no-ask-password 2>/dev/null "
|
||
|
|
"|| sudo -S -p '' systemctl reboot; echo RC=$?",
|
||
|
|
stdin=(gpubox._password() + "\n").encode())
|
||
|
|
for line in out.splitlines():
|
||
|
|
if line.startswith("BOOT="):
|
||
|
|
before = line[5:].strip()
|
||
|
|
if before:
|
||
|
|
log(f"attempt {attempt}: connected, boot_id {before[:8]}..., reboot issued "
|
||
|
|
f"({[l for l in out.splitlines() if l.startswith('RC=')] or 'session dropped'})")
|
||
|
|
break
|
||
|
|
time.sleep(20)
|
||
|
|
else:
|
||
|
|
log("no SSH window in ~2 h; reboot NOT issued"); sys.exit(1)
|
||
|
|
|
||
|
|
# 2. Wait for it to come back with a different boot_id.
|
||
|
|
time.sleep(60)
|
||
|
|
for attempt in range(1, 361):
|
||
|
|
code, out = ssh("echo BOOT=$(cat /proc/sys/kernel/random/boot_id); uptime -p; "
|
||
|
|
"echo LLAMA=$(systemctl --user is-active llama-swap.service); "
|
||
|
|
"iw dev wlan0 link 2>/dev/null | grep -E 'signal|bitrate'")
|
||
|
|
now = next((l[5:].strip() for l in out.splitlines() if l.startswith("BOOT=")), None)
|
||
|
|
if now and now != before:
|
||
|
|
log(f"back after reboot: boot_id {now[:8]}... (was {before[:8]}...)")
|
||
|
|
for line in out.splitlines():
|
||
|
|
if not line.startswith("BOOT="):
|
||
|
|
log(" " + line.strip())
|
||
|
|
break
|
||
|
|
if now == before:
|
||
|
|
log("still the old boot -- reboot has not happened yet")
|
||
|
|
time.sleep(20)
|
||
|
|
else:
|
||
|
|
log("did not come back within ~2 h"); sys.exit(1)
|
||
|
|
|
||
|
|
# 3. Link quality now, the point of the exercise.
|
||
|
|
p = subprocess.run(["ping", "-c", "30", "-i", "1", "-W", "2", gpubox.HOST.split("@")[-1]],
|
||
|
|
stdout=subprocess.PIPE).stdout.decode()
|
||
|
|
log("ping: " + " / ".join(l.strip() for l in p.splitlines()[-2:]))
|