fix GUI notifications

nohang

@@ -9,6 +9,9 @@ from time import sleep, time
 from argparse import ArgumentParser
 from sys import stdout
 
+from subprocess import Popen, PIPE
+
+
 sig_dict = {signal.SIGKILL: 'SIGKILL',
     signal.SIGTERM: 'SIGTERM'}
 
@@ -43,6 +46,46 @@ name_strip_string = '\'"`\\!-$'
 # function definition section
 
 
+# return list of tuples with
+# username, DISPLAY and DBUS_SESSION_BUS_ADDRESS
+def root_notify_env():
+
+    ps_output_list = Popen(['ps', 'aue'], stdout=PIPE
+        ).communicate()[0].decode().split('\n')
+
+    di = 'DISPLAY='
+    db = 'DBUS_SESSION_BUS_ADDRESS='
+    us = 'USER='
+    ro = 'root '
+
+    lines_with_displays = []
+    for line in ps_output_list:
+        if di in line and db in line and us in line and not line.startswith(ro):
+            lines_with_displays.append(line)
+
+    # list of tuples with all necessary
+    deus = []
+    for i in lines_with_displays:
+        for i in i.split(' '):
+            if i.startswith(us):
+                user = i.strip('\n').split('=')[1]
+                continue
+            if i.startswith(di):
+                disp_value = i.strip('\n').split('=')[1][0:2]
+                disp = di + disp_value
+                continue
+            if i.startswith(db):
+                dbus = i.strip('\n')
+        deus.append(tuple([user, disp, dbus]))
+
+    # unique list of tuples
+    vult = []
+    for user_env_tuple in set(deus):
+        vult.append(user_env_tuple)
+
+    return vult
+
+
 def string_to_float_convert_test(string):
     try:
         return float(string)
@@ -204,13 +247,20 @@ def send_notify(signal, name, pid, oom_score, vm_rss, vm_swap):
         'id:</i> <b>{}</b> \n<i>Badness:</i> <b>{}</b> \n<i>VmRSS:</i> <b' \
         '>{} MiB</b> \n<i>VmSwap:</i> <b>{} MiB</b>" &'.format(
             sig_dict[signal], name.strip(name_strip_string), pid, oom_score, vm_rss, vm_swap)
+
     if root:
         # отправляем уведомление всем залогиненным пользователям
-        for uid in os.listdir('/run/user'):
+        b = root_notify_env()
-            root_notify_command = 'sudo -u {} DISPLAY={} notify-send {} "Pr' \
+        if len(b) > 0:
-                'eventing OOM" '.format(
+            for i in b:
-                    users_dict[uid], root_display, notify_options)
+                username = i[0]
+                display_env = i[1]
+                dbus_env = i[2]
+                # su username - -c "env DISPLAY=... DBUS_SESSION_BUS_ADDRESS=... notify-send 'head' 'body'"
+                root_notify_command = 'sudo -u {} {} {} notify-send "Preventing OOM" '.format(
+                    username, display_env, dbus_env)
                 os.system(root_notify_command + info)
+
     else:
         # отправляем уведомление пользователю, который запустил nohang
         user_notify_command = 'notify-send {} "Preventing OOM" '.format(