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#! /usr/bin/python3
import json
import os
import pwd
import signal
import subprocess
import sys
import time
# mount-users -- Find and terminate processes that keep a mount busy
def fuser(mount_point):
import dbus
bus = dbus.SystemBus()
systemd_manager = dbus.Interface(bus.get_object('org.freedesktop.systemd1', '/org/freedesktop/systemd1'),
dbus_interface='org.freedesktop.systemd1.Manager')
results = {}
def get_cmdline(pid):
with open(f"/proc/{pid}/cmdline") as f:
return " ".join(f.read().split("\0"))
def get_stat(pid):
with open(f"/proc/{pid}/stat") as f:
stat = f.read()
# Field two is everything between the first "(" and the last ")", the rest is space separated.
comm_start = stat.index("(") + 1
comm_end = stat.rindex(")")
return ([stat[0:comm_start - 1].strip(), stat[comm_start:comm_end],
*list(filter(lambda f: f != '', stat[comm_end + 1:-1].split(' ')))])
def get_loginuser(pid):
uid = os.stat("/proc/%s" % pid).st_uid
try:
return pwd.getpwuid(uid).pw_name
except OSError:
return uid
def check(path, pid):
t = os.readlink(path)
if t == mount_point or t.startswith(mount_point + "/"):
unit = systemd_manager.GetUnitByPID(int(pid))
if unit not in results:
unit_obj = bus.get_object('org.freedesktop.systemd1', unit)
unit_id = unit_obj.Get("org.freedesktop.systemd1.Unit", "Id",
dbus_interface="org.freedesktop.DBus.Properties")
if unit_id.endswith(".scope"):
stat = get_stat(pid)
start = int(stat[21]) / os.sysconf('SC_CLK_TCK')
results[pid] = {"pid": int(pid),
"cmd": get_cmdline(pid),
"comm": stat[1],
"user": get_loginuser(pid),
"since": time.clock_gettime(time.CLOCK_MONOTONIC) - start}
else:
desc = unit_obj.Get("org.freedesktop.systemd1.Unit", "Description",
dbus_interface="org.freedesktop.DBus.Properties")
timestamp = unit_obj.Get("org.freedesktop.systemd1.Unit", "ActiveEnterTimestamp",
dbus_interface="org.freedesktop.DBus.Properties")
results[unit] = {"unit": unit_id,
"cmd": get_cmdline(pid),
"desc": desc,
"user": get_loginuser(pid),
"since": time.time() - timestamp / 1e6}
return True
return False
def checkdir(path, pid):
for f in os.listdir(path):
if check(os.path.join(path, f), pid):
return True
return False
my_pid = os.getpid()
for p in os.listdir("/proc/"):
if not p.isdigit():
continue
if int(p) == my_pid:
continue
proc = "/proc/%s/" % p
try:
if check(proc + "exe", p):
continue
if check(proc + "root", p):
continue
if check(proc + "cwd", p):
continue
if checkdir(proc + "fd", p):
continue
if checkdir(proc + "map_files", p):
continue
except OSError:
pass
return list(results.values())
def users(mount_point):
data = fuser(mount_point)
sys.stdout.write(json.dumps(data) + "\n")
sys.stdout.flush()
def stop_pids(pids):
def sendsig(pid, sig):
try:
os.kill(pid, sig)
return True
except Exception:
return False
def sendsigs(pids, sig):
for p in pids:
sendsig(p, sig)
def pollpids(pids, count, interval):
while count > 0:
i = 0
while i < len(pids):
if not sendsig(pids[i], 0):
pids.pop(i)
else:
i += 1
if len(pids) == 0:
break
count -= 1
time.sleep(interval)
sendsigs(pids, signal.SIGTERM)
sendsigs(pids, signal.SIGHUP)
pollpids(pids, 10, 0.1)
pollpids(pids, 19, 1)
sendsigs(pids, signal.SIGKILL)
pollpids(pids, 10, 0.1)
def stop_units(units):
if len(units) > 0:
subprocess.check_call(['systemctl', 'stop', *units])
def stop(users):
stop_pids([u["pid"] for u in users if "pid" in u])
stop_units([u["unit"] for u in users if "unit" in u])
def dispatch(argv):
if argv[1] == "users":
users(argv[2])
elif argv[1] == "stop":
stop(json.loads(argv[2]))
try:
dispatch(sys.argv)
except subprocess.CalledProcessError as e:
sys.exit(e.returncode)
except Exception as e:
sys.stderr.write(str(e) + "\n")
sys.exit(1)
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