From aceb0817a65bf01669cada3ceb60d65b81607bc3 Mon Sep 17 00:00:00 2001
From: Thomas Mangin <thomas.mangin@exa.net.uk>
Date: Sun, 5 Apr 2020 14:36:29 +0100
Subject: util: T2226: covert most calls from os.system to util

As little change a possible but the function call
The behaviour should be totally unchanged.
---
 src/conf_mode/bcast_relay.py              |  5 +++--
 src/conf_mode/dhcp_relay.py               |  5 +++--
 src/conf_mode/dhcp_server.py              |  6 ++++--
 src/conf_mode/dhcpv6_relay.py             |  6 ++++--
 src/conf_mode/dhcpv6_server.py            |  6 ++++--
 src/conf_mode/dns_forwarding.py           |  5 +++--
 src/conf_mode/dynamic_dns.py              |  6 ++++--
 src/conf_mode/firewall_options.py         | 28 +++++++++++++++-------------
 src/conf_mode/http-api.py                 |  6 +++---
 src/conf_mode/https.py                    |  6 ++++--
 src/conf_mode/igmp_proxy.py               |  6 ++++--
 src/conf_mode/interfaces-bonding.py       |  4 +++-
 src/conf_mode/interfaces-l2tpv3.py        |  3 ++-
 src/conf_mode/interfaces-wirelessmodem.py |  4 ++--
 src/conf_mode/ipsec-settings.py           |  9 +++++----
 src/conf_mode/le_cert.py                  |  6 ++++--
 src/conf_mode/lldp.py                     |  6 ++++--
 src/conf_mode/mdns_repeater.py            |  6 ++++--
 src/conf_mode/ntp.py                      |  6 ++++--
 src/conf_mode/protocols_bfd.py            | 11 +++++++++++
 src/conf_mode/protocols_igmp.py           |  4 +++-
 src/conf_mode/protocols_mpls.py           |  6 ++++--
 src/conf_mode/protocols_pim.py            |  6 ++++++
 src/conf_mode/salt-minion.py              |  6 ++++--
 src/conf_mode/service-router-advert.py    |  6 ++++--
 src/conf_mode/snmp.py                     | 18 ++++++++++--------
 src/conf_mode/ssh.py                      |  6 ++++--
 src/conf_mode/system-ip.py                |  4 +++-
 src/conf_mode/system-ipv6.py              |  4 +++-
 src/conf_mode/system-options.py           |  5 +++--
 src/conf_mode/system-timezone.py          |  6 +++---
 src/conf_mode/tftp_server.py              |  6 ++++--
 src/helpers/validate-value.py             |  4 +++-
 src/op_mode/connect_disconnect.py         |  9 +++++----
 src/op_mode/dns_forwarding_reset.py       |  6 ++++--
 src/op_mode/dynamic_dns.py                |  6 ++++--
 src/op_mode/restart_dhcp_relay.py         |  6 ++++--
 src/op_mode/show_acceleration.py          | 10 ++++++----
 src/op_mode/show_dhcp.py                  |  7 +++++--
 src/op_mode/show_dhcpv6.py                |  6 ++++--
 src/op_mode/snmp.py                       |  3 ++-
 41 files changed, 178 insertions(+), 96 deletions(-)

diff --git a/src/conf_mode/bcast_relay.py b/src/conf_mode/bcast_relay.py
index 96576ddd4..f6d90776c 100755
--- a/src/conf_mode/bcast_relay.py
+++ b/src/conf_mode/bcast_relay.py
@@ -24,6 +24,7 @@ from jinja2 import FileSystemLoader, Environment
 from vyos.config import Config
 from vyos.defaults import directories as vyos_data_dir
 from vyos import ConfigError
+from vyos.util import run
 
 config_file = r'/etc/default/udp-broadcast-relay'
 
@@ -154,7 +155,7 @@ def generate(relay):
 
 def apply(relay):
     # first stop all running services
-    os.system('sudo systemctl stop udp-broadcast-relay@{1..99}')
+    run('sudo systemctl stop udp-broadcast-relay@{1..99}')
 
     if (relay is None) or relay['disabled']:
         return None
@@ -164,7 +165,7 @@ def apply(relay):
         # Don't start individual instance when it's disabled
         if r['disabled']:
             continue
-        os.system('sudo systemctl start udp-broadcast-relay@{0}'.format(r['id']))
+        run('sudo systemctl start udp-broadcast-relay@{0}'.format(r['id']))
 
     return None
 
diff --git a/src/conf_mode/dhcp_relay.py b/src/conf_mode/dhcp_relay.py
index 6f8d66e7b..1d6d4c6e3 100755
--- a/src/conf_mode/dhcp_relay.py
+++ b/src/conf_mode/dhcp_relay.py
@@ -22,6 +22,7 @@ from sys import exit
 from vyos.config import Config
 from vyos.defaults import directories as vyos_data_dir
 from vyos import ConfigError
+from vyos.util import run
 
 config_file = r'/etc/default/isc-dhcp-relay'
 
@@ -112,10 +113,10 @@ def generate(relay):
 
 def apply(relay):
     if relay is not None:
-        os.system('sudo systemctl restart isc-dhcp-relay.service')
+        run('sudo systemctl restart isc-dhcp-relay.service')
     else:
         # DHCP relay support is removed in the commit
-        os.system('sudo systemctl stop isc-dhcp-relay.service')
+        run('sudo systemctl stop isc-dhcp-relay.service')
         os.unlink(config_file)
 
     return None
diff --git a/src/conf_mode/dhcp_server.py b/src/conf_mode/dhcp_server.py
index 3d75414f5..69aebe2f4 100755
--- a/src/conf_mode/dhcp_server.py
+++ b/src/conf_mode/dhcp_server.py
@@ -26,6 +26,8 @@ from vyos.config import Config
 from vyos.defaults import directories as vyos_data_dir
 from vyos.validate import is_subnet_connected
 from vyos import ConfigError
+from vyos.util import run
+
 
 config_file = r'/etc/dhcp/dhcpd.conf'
 lease_file = r'/config/dhcpd.leases'
@@ -626,7 +628,7 @@ def generate(dhcp):
 def apply(dhcp):
     if (dhcp is None) or dhcp['disabled']:
         # DHCP server is removed in the commit
-        os.system('sudo systemctl stop isc-dhcpv4-server.service')
+        run('sudo systemctl stop isc-dhcpv4-server.service')
         if os.path.exists(config_file):
             os.unlink(config_file)
         if os.path.exists(daemon_config_file):
@@ -636,7 +638,7 @@ def apply(dhcp):
         if not os.path.exists(lease_file):
             os.mknod(lease_file)
 
-        os.system('sudo systemctl restart isc-dhcpv4-server.service')
+        run('sudo systemctl restart isc-dhcpv4-server.service')
 
     return None
 
diff --git a/src/conf_mode/dhcpv6_relay.py b/src/conf_mode/dhcpv6_relay.py
index d942daf37..a67deb6c7 100755
--- a/src/conf_mode/dhcpv6_relay.py
+++ b/src/conf_mode/dhcpv6_relay.py
@@ -23,6 +23,8 @@ from jinja2 import FileSystemLoader, Environment
 from vyos.config import Config
 from vyos.defaults import directories as vyos_data_dir
 from vyos import ConfigError
+from vyos.util import run
+
 
 config_file = r'/etc/default/isc-dhcpv6-relay'
 
@@ -98,10 +100,10 @@ def generate(relay):
 
 def apply(relay):
     if relay is not None:
-        os.system('sudo systemctl restart isc-dhcpv6-relay.service')
+        run('sudo systemctl restart isc-dhcpv6-relay.service')
     else:
         # DHCPv6 relay support is removed in the commit
-        os.system('sudo systemctl stop isc-dhcpv6-relay.service')
+        run('sudo systemctl stop isc-dhcpv6-relay.service')
         os.unlink(config_file)
 
     return None
diff --git a/src/conf_mode/dhcpv6_server.py b/src/conf_mode/dhcpv6_server.py
index 10b40baa4..003e80915 100755
--- a/src/conf_mode/dhcpv6_server.py
+++ b/src/conf_mode/dhcpv6_server.py
@@ -25,6 +25,8 @@ from vyos.config import Config
 from vyos.defaults import directories as vyos_data_dir
 from vyos.validate import is_subnet_connected
 from vyos import ConfigError
+from vyos.util import run
+
 
 config_file = r'/etc/dhcp/dhcpdv6.conf'
 lease_file = r'/config/dhcpdv6.leases'
@@ -362,7 +364,7 @@ def generate(dhcpv6):
 def apply(dhcpv6):
     if (dhcpv6 is None) or dhcpv6['disabled']:
         # DHCP server is removed in the commit
-        os.system('sudo systemctl stop isc-dhcpv6-server.service')
+        run('sudo systemctl stop isc-dhcpv6-server.service')
         if os.path.exists(config_file):
             os.unlink(config_file)
         if os.path.exists(daemon_config_file):
@@ -372,7 +374,7 @@ def apply(dhcpv6):
         if not os.path.exists(lease_file):
             os.mknod(lease_file)
 
-        os.system('sudo systemctl restart isc-dhcpv6-server.service')
+        run('sudo systemctl restart isc-dhcpv6-server.service')
 
     return None
 
diff --git a/src/conf_mode/dns_forwarding.py b/src/conf_mode/dns_forwarding.py
index bbb69cdf7..5dc599425 100755
--- a/src/conf_mode/dns_forwarding.py
+++ b/src/conf_mode/dns_forwarding.py
@@ -26,6 +26,7 @@ from vyos.defaults import directories as vyos_data_dir
 from vyos.hostsd_client import Client as hostsd_client
 from vyos.util import wait_for_commit_lock
 from vyos import ConfigError
+from vyos.util import run
 
 parser = argparse.ArgumentParser()
 parser.add_argument("--dhclient", action="store_true",
@@ -166,11 +167,11 @@ def generate(dns):
 def apply(dns):
     if dns is None:
         # DNS forwarding is removed in the commit
-        os.system("systemctl stop pdns-recursor")
+        run("systemctl stop pdns-recursor")
         if os.path.isfile(config_file):
             os.unlink(config_file)
     else:
-        os.system("systemctl restart pdns-recursor")
+        run("systemctl restart pdns-recursor")
 
 if __name__ == '__main__':
     args = parser.parse_args()
diff --git a/src/conf_mode/dynamic_dns.py b/src/conf_mode/dynamic_dns.py
index 56ce4fedc..b9163f7b3 100755
--- a/src/conf_mode/dynamic_dns.py
+++ b/src/conf_mode/dynamic_dns.py
@@ -24,6 +24,8 @@ from stat import S_IRUSR, S_IWUSR
 from vyos.config import Config
 from vyos.defaults import directories as vyos_data_dir
 from vyos import ConfigError
+from vyos.util import run
+
 
 config_file = r'/etc/ddclient/ddclient.conf'
 cache_file = r'/var/cache/ddclient/ddclient.cache'
@@ -255,11 +257,11 @@ def apply(dyndns):
         os.unlink('/etc/ddclient.conf')
 
     if dyndns['deleted']:
-        os.system('/etc/init.d/ddclient stop')
+        run('/etc/init.d/ddclient stop')
         if os.path.exists(dyndns['pid_file']):
             os.unlink(dyndns['pid_file'])
     else:
-        os.system('/etc/init.d/ddclient restart')
+        run('/etc/init.d/ddclient restart')
 
     return None
 
diff --git a/src/conf_mode/firewall_options.py b/src/conf_mode/firewall_options.py
index 2be80cdbf..90f004bc4 100755
--- a/src/conf_mode/firewall_options.py
+++ b/src/conf_mode/firewall_options.py
@@ -21,6 +21,8 @@ import copy
 
 from vyos.config import Config
 from vyos import ConfigError
+from vyos.util import run
+
 
 default_config_data = {
     'intf_opts': [],
@@ -85,19 +87,19 @@ def apply(tcp):
     target = 'VYOS_FW_OPTIONS'
 
     # always cleanup iptables
-    os.system('iptables --table mangle --delete FORWARD --jump {} >&/dev/null'.format(target))
-    os.system('iptables --table mangle --flush {} >&/dev/null'.format(target))
-    os.system('iptables --table mangle --delete-chain {} >&/dev/null'.format(target))
+    run('iptables --table mangle --delete FORWARD --jump {} >&/dev/null'.format(target))
+    run('iptables --table mangle --flush {} >&/dev/null'.format(target))
+    run('iptables --table mangle --delete-chain {} >&/dev/null'.format(target))
 
     # always cleanup ip6tables
-    os.system('ip6tables --table mangle --delete FORWARD --jump {} >&/dev/null'.format(target))
-    os.system('ip6tables --table mangle --flush {} >&/dev/null'.format(target))
-    os.system('ip6tables --table mangle --delete-chain {} >&/dev/null'.format(target))
+    run('ip6tables --table mangle --delete FORWARD --jump {} >&/dev/null'.format(target))
+    run('ip6tables --table mangle --flush {} >&/dev/null'.format(target))
+    run('ip6tables --table mangle --delete-chain {} >&/dev/null'.format(target))
 
     # Setup new iptables rules
     if tcp['new_chain4']:
-        os.system('iptables --table mangle --new-chain {} >&/dev/null'.format(target))
-        os.system('iptables --table mangle --append FORWARD --jump {} >&/dev/null'.format(target))
+        run('iptables --table mangle --new-chain {} >&/dev/null'.format(target))
+        run('iptables --table mangle --append FORWARD --jump {} >&/dev/null'.format(target))
 
         for opts in tcp['intf_opts']:
             intf = opts['intf']
@@ -109,13 +111,13 @@ def apply(tcp):
 
             # adjust TCP MSS per interface
             if mss:
-                os.system('iptables --table mangle --append {} --out-interface {} --protocol tcp ' \
+                run('iptables --table mangle --append {} --out-interface {} --protocol tcp ' \
                           '--tcp-flags SYN,RST SYN --jump TCPMSS --set-mss {} >&/dev/null'.format(target, intf, mss))
 
     # Setup new ip6tables rules
     if tcp['new_chain6']:
-        os.system('ip6tables --table mangle --new-chain {} >&/dev/null'.format(target))
-        os.system('ip6tables --table mangle --append FORWARD --jump {} >&/dev/null'.format(target))
+        run('ip6tables --table mangle --new-chain {} >&/dev/null'.format(target))
+        run('ip6tables --table mangle --append FORWARD --jump {} >&/dev/null'.format(target))
 
         for opts in tcp['intf_opts']:
             intf = opts['intf']
@@ -127,8 +129,8 @@ def apply(tcp):
 
             # adjust TCP MSS per interface
             if mss:
-                os.system('ip6tables --table mangle --append {} --out-interface {} --protocol tcp ' \
-                          '--tcp-flags SYN,RST SYN --jump TCPMSS --set-mss {} >&/dev/null'.format(target, intf, mss))
+                run('ip6tables --table mangle --append {} --out-interface {} --protocol tcp '
+                    '--tcp-flags SYN,RST SYN --jump TCPMSS --set-mss {} >&/dev/null'.format(target, intf, mss))
 
     return None
 
diff --git a/src/conf_mode/http-api.py b/src/conf_mode/http-api.py
index 0c2e029e9..ffa68af55 100755
--- a/src/conf_mode/http-api.py
+++ b/src/conf_mode/http-api.py
@@ -18,13 +18,13 @@
 
 import sys
 import os
-import subprocess
 import json
 from copy import deepcopy
 
 import vyos.defaults
 from vyos.config import Config
 from vyos import ConfigError
+from vyos.util import cmd, run
 
 config_file = '/etc/vyos/http-api.conf'
 
@@ -91,9 +91,9 @@ def generate(http_api):
 
 def apply(http_api):
     if http_api is not None:
-        os.system('sudo systemctl restart vyos-http-api.service')
+        run('sudo systemctl restart vyos-http-api.service')
     else:
-        os.system('sudo systemctl stop vyos-http-api.service')
+        run('sudo systemctl stop vyos-http-api.service')
 
     for dep in dependencies:
         cmd = '{0}/{1}'.format(vyos_conf_scripts_dir, dep)
diff --git a/src/conf_mode/https.py b/src/conf_mode/https.py
index 83a5f3602..e46f1a4e7 100755
--- a/src/conf_mode/https.py
+++ b/src/conf_mode/https.py
@@ -26,6 +26,8 @@ import vyos.certbot_util
 from vyos.config import Config
 from vyos.defaults import directories as vyos_data_dir
 from vyos import ConfigError
+from vyos.util import run
+
 
 config_file = '/etc/nginx/sites-available/default'
 
@@ -144,9 +146,9 @@ def generate(https):
 
 def apply(https):
     if https is not None:
-        os.system('sudo systemctl restart nginx.service')
+        run('sudo systemctl restart nginx.service')
     else:
-        os.system('sudo systemctl stop nginx.service')
+        run('sudo systemctl stop nginx.service')
 
 if __name__ == '__main__':
     try:
diff --git a/src/conf_mode/igmp_proxy.py b/src/conf_mode/igmp_proxy.py
index aa46f2c4e..abe473530 100755
--- a/src/conf_mode/igmp_proxy.py
+++ b/src/conf_mode/igmp_proxy.py
@@ -24,6 +24,8 @@ from netifaces import interfaces
 from vyos.config import Config
 from vyos.defaults import directories as vyos_data_dir
 from vyos import ConfigError
+from vyos.util import run
+
 
 config_file = r'/etc/igmpproxy.conf'
 
@@ -129,11 +131,11 @@ def generate(igmp_proxy):
 def apply(igmp_proxy):
     if igmp_proxy is None or igmp_proxy['disable']:
          # IGMP Proxy support is removed in the commit
-         os.system('sudo systemctl stop igmpproxy.service')
+         run('sudo systemctl stop igmpproxy.service')
          if os.path.exists(config_file):
              os.unlink(config_file)
     else:
-        os.system('systemctl restart igmpproxy.service')
+        run('systemctl restart igmpproxy.service')
 
     return None
 
diff --git a/src/conf_mode/interfaces-bonding.py b/src/conf_mode/interfaces-bonding.py
index cc119b91a..19f43f725 100755
--- a/src/conf_mode/interfaces-bonding.py
+++ b/src/conf_mode/interfaces-bonding.py
@@ -25,6 +25,8 @@ from vyos.ifconfig_vlan import apply_vlan_config, verify_vlan_config
 from vyos.configdict import list_diff, vlan_to_dict
 from vyos.config import Config
 from vyos import ConfigError
+from vyos.util import run
+
 
 default_config_data = {
     'address': [],
@@ -90,7 +92,7 @@ def get_config():
     if not os.path.isfile('/sys/class/net/bonding_masters'):
         import syslog
         syslog.syslog(syslog.LOG_NOTICE, "loading bonding kernel module")
-        if os.system('modprobe bonding max_bonds=0 miimon=250') != 0:
+        if run('modprobe bonding max_bonds=0 miimon=250') != 0:
             syslog.syslog(syslog.LOG_NOTICE, "failed loading bonding kernel module")
             raise ConfigError("failed loading bonding kernel module")
 
diff --git a/src/conf_mode/interfaces-l2tpv3.py b/src/conf_mode/interfaces-l2tpv3.py
index af1d3f482..4b5fc8306 100755
--- a/src/conf_mode/interfaces-l2tpv3.py
+++ b/src/conf_mode/interfaces-l2tpv3.py
@@ -22,6 +22,7 @@ from copy import deepcopy
 from vyos.config import Config
 from vyos.ifconfig import L2TPv3If, Interface
 from vyos import ConfigError
+from vyos.util import run
 from netifaces import interfaces
 
 default_config_data = {
@@ -50,7 +51,7 @@ def check_kmod():
     modules = ['l2tp_eth', 'l2tp_netlink', 'l2tp_ip', 'l2tp_ip6']
     for module in modules:
         if not os.path.exists(f'/sys/module/{module}'):
-            if os.system(f'modprobe {module}') != 0:
+            if run(f'modprobe {module}') != 0:
                 raise ConfigError(f'Loading Kernel module {module} failed')
 
 def get_config():
diff --git a/src/conf_mode/interfaces-wirelessmodem.py b/src/conf_mode/interfaces-wirelessmodem.py
index da33d54e4..4df459768 100755
--- a/src/conf_mode/interfaces-wirelessmodem.py
+++ b/src/conf_mode/interfaces-wirelessmodem.py
@@ -23,7 +23,7 @@ from netifaces import interfaces
 
 from vyos.config import Config
 from vyos.defaults import directories as vyos_data_dir
-from vyos.util import chown_file, chmod_x, subprocess_cmd
+from vyos.util import chown_file, chmod_x, cmd, run
 from vyos import ConfigError
 
 default_config_data = {
@@ -48,7 +48,7 @@ def check_kmod():
     modules = ['option', 'usb_wwan', 'usbserial']
     for module in modules:
         if not os.path.exists(f'/sys/module/{module}'):
-            if os.system(f'modprobe {module}') != 0:
+            if run(f'modprobe {module}') != 0:
                 raise ConfigError(f'Loading Kernel module {module} failed')
 
 def get_config():
diff --git a/src/conf_mode/ipsec-settings.py b/src/conf_mode/ipsec-settings.py
index 90b6b0d57..c2f5c8e07 100755
--- a/src/conf_mode/ipsec-settings.py
+++ b/src/conf_mode/ipsec-settings.py
@@ -24,6 +24,7 @@ from sys import exit
 from vyos.config import Config
 from vyos.defaults import directories as vyos_data_dir
 from vyos import ConfigError
+from vyos.util import run
 
 ra_conn_name = "remote-access"
 charon_conf_file = "/etc/strongswan.d/charon.conf"
@@ -98,7 +99,7 @@ def get_config():
 
 ### Remove config from file by delimiter
 def remove_confs(delim_begin, delim_end, conf_file):
-    os.system("sed -i '/"+delim_begin+"/,/"+delim_end+"/d' "+conf_file)
+    run("sed -i '/"+delim_begin+"/,/"+delim_end+"/d' "+conf_file)
 
 
 ### Checking certificate storage and notice if certificate not in /config directory
@@ -111,7 +112,7 @@ def check_cert_file_store(cert_name, file_path, dts_path):
     else:
       ### Cpy file to /etc/ipsec.d/certs/ /etc/ipsec.d/cacerts/
       # todo make check
-      ret = os.system('cp -f '+file_path+' '+dts_path)
+      ret = run('cp -f '+file_path+' '+dts_path)
       if ret:
          raise ConfigError("L2TP VPN configuration error: Cannot copy "+file_path)
 
@@ -192,12 +193,12 @@ def generate(data):
         remove_confs(delim_ipsec_l2tp_begin, delim_ipsec_l2tp_end, ipsec_conf_flie)
 
 def restart_ipsec():
-    os.system('ipsec restart >&/dev/null')
+    run('ipsec restart >&/dev/null')
     # counter for apply swanctl config
     counter = 10
     while counter <= 10:
         if os.path.exists(charon_pidfile):
-            os.system('swanctl -q >&/dev/null')
+            run('swanctl -q >&/dev/null')
             break
         counter -=1
         sleep(1)
diff --git a/src/conf_mode/le_cert.py b/src/conf_mode/le_cert.py
index c657098e1..c0df77710 100755
--- a/src/conf_mode/le_cert.py
+++ b/src/conf_mode/le_cert.py
@@ -23,6 +23,8 @@ import subprocess
 import vyos.defaults
 from vyos.config import Config
 from vyos import ConfigError
+from vyos.util import cmd, run
+
 
 vyos_conf_scripts_dir = vyos.defaults.directories['conf_mode']
 
@@ -84,9 +86,9 @@ def generate(cert):
 
     # certbot will attempt to reload nginx, even with 'certonly';
     # start nginx if not active
-    ret = os.system('systemctl is-active --quiet nginx.ervice')
+    ret = run('systemctl is-active --quiet nginx.ervice')
     if ret:
-        os.system('sudo systemctl start nginx.service')
+        run('sudo systemctl start nginx.service')
 
     ret = request_certbot(cert)
     if ret:
diff --git a/src/conf_mode/lldp.py b/src/conf_mode/lldp.py
index 4e3dfc0b6..c090bba83 100755
--- a/src/conf_mode/lldp.py
+++ b/src/conf_mode/lldp.py
@@ -26,6 +26,8 @@ from vyos.validate import is_addr_assigned,is_loopback_addr
 from vyos.defaults import directories as vyos_data_dir
 from vyos.version import get_version_data
 from vyos import ConfigError
+from vyos.util import run
+
 
 config_file = "/etc/default/lldpd"
 vyos_config_file = "/etc/lldpd.d/01-vyos.conf"
@@ -239,10 +241,10 @@ def generate(lldp):
 def apply(lldp):
     if lldp:
         # start/restart lldp service
-        os.system('sudo systemctl restart lldpd.service')
+        run('sudo systemctl restart lldpd.service')
     else:
         # LLDP service has been terminated
-        os.system('sudo systemctl stop lldpd.service')
+        run('sudo systemctl stop lldpd.service')
         os.unlink(config_file)
         os.unlink(vyos_config_file)
 
diff --git a/src/conf_mode/mdns_repeater.py b/src/conf_mode/mdns_repeater.py
index f738cc6a6..2bccd9153 100755
--- a/src/conf_mode/mdns_repeater.py
+++ b/src/conf_mode/mdns_repeater.py
@@ -24,6 +24,8 @@ from netifaces import ifaddresses, AF_INET
 from vyos.config import Config
 from vyos.defaults import directories as vyos_data_dir
 from vyos import ConfigError
+from vyos.util import run
+
 
 config_file = r'/etc/default/mdns-repeater'
 
@@ -94,11 +96,11 @@ def generate(mdns):
 
 def apply(mdns):
     if (mdns is None) or mdns['disabled']:
-        os.system('sudo systemctl stop mdns-repeater')
+        run('sudo systemctl stop mdns-repeater')
         if os.path.exists(config_file):
             os.unlink(config_file)
     else:
-        os.system('sudo systemctl restart mdns-repeater')
+        run('sudo systemctl restart mdns-repeater')
 
     return None
 
diff --git a/src/conf_mode/ntp.py b/src/conf_mode/ntp.py
index 0f635556b..998022a8c 100755
--- a/src/conf_mode/ntp.py
+++ b/src/conf_mode/ntp.py
@@ -24,6 +24,8 @@ from sys import exit
 from vyos.config import Config
 from vyos.defaults import directories as vyos_data_dir
 from vyos import ConfigError
+from vyos.util import run
+
 
 config_file = r'/etc/ntp.conf'
 
@@ -112,10 +114,10 @@ def generate(ntp):
 
 def apply(ntp):
     if ntp is not None:
-        os.system('sudo systemctl restart ntp.service')
+        run('sudo systemctl restart ntp.service')
     else:
         # NTP support is removed in the commit
-        os.system('sudo systemctl stop ntp.service')
+        run('sudo systemctl stop ntp.service')
         os.unlink(config_file)
 
     return None
diff --git a/src/conf_mode/protocols_bfd.py b/src/conf_mode/protocols_bfd.py
index 9940c80c5..52a9e54c2 100755
--- a/src/conf_mode/protocols_bfd.py
+++ b/src/conf_mode/protocols_bfd.py
@@ -24,6 +24,8 @@ from vyos.config import Config
 from vyos.defaults import directories as vyos_data_dir
 from vyos.validate import is_ipv6_link_local, is_ipv6
 from vyos import ConfigError
+from vyos.util import run
+
 
 config_file = r'/tmp/bfd.frr'
 
@@ -205,7 +207,16 @@ def apply(bfd):
     if bfd is None:
         return None
 
+<<<<<<< HEAD
     os.system(f'vtysh -d bfdd -f {config_file}')
+=======
+    tmpl = jinja2.Template(config_tmpl)
+    config_text = tmpl.render(bfd)
+    with open(config_file, 'w') as f:
+        f.write(config_text)
+
+    run("sudo vtysh -d bfdd -f " + config_file)
+>>>>>>> util: T2226: covert most calls from os.system to util
     if os.path.exists(config_file):
         os.remove(config_file)
 
diff --git a/src/conf_mode/protocols_igmp.py b/src/conf_mode/protocols_igmp.py
index 0148b5dac..6e819a15a 100755
--- a/src/conf_mode/protocols_igmp.py
+++ b/src/conf_mode/protocols_igmp.py
@@ -23,6 +23,8 @@ from sys import exit
 from vyos import ConfigError
 from vyos.config import Config
 from vyos.defaults import directories as vyos_data_dir
+from vyos.util import run
+
 
 config_file = r'/tmp/igmp.frr'
 
@@ -103,7 +105,7 @@ def apply(igmp):
         return None
 
     if os.path.exists(config_file):
-        os.system("sudo vtysh -d pimd -f " + config_file)
+        run("sudo vtysh -d pimd -f " + config_file)
         os.remove(config_file)
 
     return None
diff --git a/src/conf_mode/protocols_mpls.py b/src/conf_mode/protocols_mpls.py
index 514fe5efb..6e5d08397 100755
--- a/src/conf_mode/protocols_mpls.py
+++ b/src/conf_mode/protocols_mpls.py
@@ -21,11 +21,13 @@ from jinja2 import FileSystemLoader, Environment
 from vyos.config import Config
 from vyos.defaults import directories as vyos_data_dir
 from vyos import ConfigError
+from vyos.util import run
+
 
 config_file = r'/tmp/ldpd.frr'
 
 def sysctl(name, value):
-    os.system('sysctl -wq {}={}'.format(name, value))
+    run('sysctl -wq {}={}'.format(name, value))
 
 def get_config():
     conf = Config()
@@ -160,7 +162,7 @@ def apply(mpls):
     operate_mpls_on_intfc(diactive_ifaces, 0)
 
     if os.path.exists(config_file):
-        os.system("sudo vtysh -d ldpd -f " + config_file)
+        run("sudo vtysh -d ldpd -f " + config_file)
         os.remove(config_file)
 
     return None
diff --git a/src/conf_mode/protocols_pim.py b/src/conf_mode/protocols_pim.py
index 7b360d62c..0e22d3a6b 100755
--- a/src/conf_mode/protocols_pim.py
+++ b/src/conf_mode/protocols_pim.py
@@ -23,6 +23,8 @@ from sys import exit
 from vyos.config import Config
 from vyos.defaults import directories as vyos_data_dir
 from vyos import ConfigError
+from vyos.util import run
+
 
 config_file = r'/tmp/pimd.frr'
 
@@ -130,7 +132,11 @@ def apply(pim):
         return None
 
     if os.path.exists(config_file):
+<<<<<<< HEAD
         os.system("vtysh -d pimd -f " + config_file)
+=======
+        run("sudo vtysh -d pimd -f " + config_file)
+>>>>>>> util: T2226: covert most calls from os.system to util
         os.remove(config_file)
 
     return None
diff --git a/src/conf_mode/salt-minion.py b/src/conf_mode/salt-minion.py
index bc1767454..bd1d44bc8 100755
--- a/src/conf_mode/salt-minion.py
+++ b/src/conf_mode/salt-minion.py
@@ -26,6 +26,8 @@ from urllib3 import PoolManager
 from vyos.config import Config
 from vyos.defaults import directories as vyos_data_dir
 from vyos import ConfigError
+from vyos.util import run
+
 
 config_file = r'/etc/salt/minion'
 
@@ -124,10 +126,10 @@ def generate(salt):
 
 def apply(salt):
     if salt is not None:
-        os.system("sudo systemctl restart salt-minion")
+        run("sudo systemctl restart salt-minion")
     else:
         # Salt access is removed in the commit
-        os.system("sudo systemctl stop salt-minion")
+        run("sudo systemctl stop salt-minion")
         os.unlink(config_file)
 
     return None
diff --git a/src/conf_mode/service-router-advert.py b/src/conf_mode/service-router-advert.py
index 38c5cb2dc..0173b7242 100755
--- a/src/conf_mode/service-router-advert.py
+++ b/src/conf_mode/service-router-advert.py
@@ -23,6 +23,8 @@ from sys import exit
 from vyos.config import Config
 from vyos.defaults import directories as vyos_data_dir
 from vyos import ConfigError
+from vyos.util import run
+
 
 config_file = r'/etc/radvd.conf'
 
@@ -156,13 +158,13 @@ def generate(rtradv):
 def apply(rtradv):
     if not rtradv['interfaces']:
         # bail out early - looks like removal from running config
-        os.system('systemctl stop radvd.service')
+        run('systemctl stop radvd.service')
         if os.path.exists(config_file):
             os.unlink(config_file)
 
         return None
 
-    os.system('systemctl restart radvd.service')
+    run('systemctl restart radvd.service')
     return None
 
 if __name__ == '__main__':
diff --git a/src/conf_mode/snmp.py b/src/conf_mode/snmp.py
index ed8c1d7e1..414236c88 100755
--- a/src/conf_mode/snmp.py
+++ b/src/conf_mode/snmp.py
@@ -27,6 +27,8 @@ from vyos.defaults import directories as vyos_data_dir
 from vyos.validate import is_ipv4, is_addr_assigned
 from vyos.version import get_version_data
 from vyos import ConfigError
+from vyos.util import run
+
 
 config_file_client  = r'/etc/snmp/snmp.conf'
 config_file_daemon  = r'/etc/snmp/snmpd.conf'
@@ -507,7 +509,7 @@ def generate(snmp):
     #
     # As we are manipulating the snmpd user database we have to stop it first!
     # This is even save if service is going to be removed
-    os.system("systemctl stop snmpd.service")
+    run('systemctl stop snmpd.service')
     config_files = [config_file_client, config_file_daemon, config_file_access,
                     config_file_user]
     for file in config_files:
@@ -552,7 +554,7 @@ def apply(snmp):
         return None
 
     # start SNMP daemon
-    os.system("systemctl restart snmpd.service")
+    run("systemctl restart snmpd.service")
 
     # Passwords are not available immediately in the configuration file,
     # after daemon startup - we wait until they have been processed by
@@ -593,15 +595,15 @@ def apply(snmp):
 
                 # Now update the running configuration
                 #
-                # Currently when executing os.system() the environment does not
+                # Currently when executing run() the environment does not
                 # have the vyos_libexec_dir variable set, see Phabricator T685.
-                os.system('/opt/vyatta/sbin/my_set service snmp v3 user "{0}" auth encrypted-key "{1}" > /dev/null'.format(cfg['user'], cfg['auth_pw']))
-                os.system('/opt/vyatta/sbin/my_set service snmp v3 user "{0}" privacy encrypted-key "{1}" > /dev/null'.format(cfg['user'], cfg['priv_pw']))
-                os.system('/opt/vyatta/sbin/my_delete service snmp v3 user "{0}" auth plaintext-key > /dev/null'.format(cfg['user']))
-                os.system('/opt/vyatta/sbin/my_delete service snmp v3 user "{0}" privacy plaintext-key > /dev/null'.format(cfg['user']))
+                run('/opt/vyatta/sbin/my_set service snmp v3 user "{0}" auth encrypted-key "{1}" > /dev/null'.format(cfg['user'], cfg['auth_pw']))
+                run('/opt/vyatta/sbin/my_set service snmp v3 user "{0}" privacy encrypted-key "{1}" > /dev/null'.format(cfg['user'], cfg['priv_pw']))
+                run('/opt/vyatta/sbin/my_delete service snmp v3 user "{0}" auth plaintext-key > /dev/null'.format(cfg['user']))
+                run('/opt/vyatta/sbin/my_delete service snmp v3 user "{0}" privacy plaintext-key > /dev/null'.format(cfg['user']))
 
     # Enable AgentX in FRR
-    os.system('vtysh -c "configure terminal" -c "agentx" >/dev/null')
+    run('vtysh -c "configure terminal" -c "agentx" >/dev/null')
 
     return None
 
diff --git a/src/conf_mode/ssh.py b/src/conf_mode/ssh.py
index 014045796..a85dcd7f2 100755
--- a/src/conf_mode/ssh.py
+++ b/src/conf_mode/ssh.py
@@ -21,6 +21,8 @@ from sys import exit
 from vyos.config import Config
 from vyos.defaults import directories as vyos_data_dir
 from vyos import ConfigError
+from vyos.util import run
+
 
 config_file = r'/etc/ssh/sshd_config'
 
@@ -131,10 +133,10 @@ def generate(ssh):
 
 def apply(ssh):
     if ssh is not None and 'port' in ssh.keys():
-        os.system("sudo systemctl restart ssh.service")
+        run("sudo systemctl restart ssh.service")
     else:
         # SSH access is removed in the commit
-        os.system("sudo systemctl stop ssh.service")
+        run("sudo systemctl stop ssh.service")
         if os.path.isfile(config_file):
             os.unlink(config_file)
 
diff --git a/src/conf_mode/system-ip.py b/src/conf_mode/system-ip.py
index 335507411..66f563939 100755
--- a/src/conf_mode/system-ip.py
+++ b/src/conf_mode/system-ip.py
@@ -20,6 +20,8 @@ from sys import exit
 from copy import deepcopy
 from vyos.config import Config
 from vyos import ConfigError
+from vyos.util import run
+
 
 default_config_data = {
     'arp_table': 8192,
@@ -29,7 +31,7 @@ default_config_data = {
 }
 
 def sysctl(name, value):
-    os.system('sysctl -wq {}={}'.format(name, value))
+    run('sysctl -wq {}={}'.format(name, value))
 
 def get_config():
     ip_opt = deepcopy(default_config_data)
diff --git a/src/conf_mode/system-ipv6.py b/src/conf_mode/system-ipv6.py
index bd28ec357..4e3de6fe9 100755
--- a/src/conf_mode/system-ipv6.py
+++ b/src/conf_mode/system-ipv6.py
@@ -21,6 +21,8 @@ from sys import exit
 from copy import deepcopy
 from vyos.config import Config
 from vyos import ConfigError
+from vyos.util import run
+
 
 ipv6_disable_file = '/etc/modprobe.d/vyos_disable_ipv6.conf'
 
@@ -35,7 +37,7 @@ default_config_data = {
 }
 
 def sysctl(name, value):
-    os.system('sysctl -wq {}={}'.format(name, value))
+    run('sysctl -wq {}={}'.format(name, value))
 
 def get_config():
     ip_opt = deepcopy(default_config_data)
diff --git a/src/conf_mode/system-options.py b/src/conf_mode/system-options.py
index a893e98b3..063a82463 100755
--- a/src/conf_mode/system-options.py
+++ b/src/conf_mode/system-options.py
@@ -20,6 +20,7 @@ from sys import exit
 from copy import deepcopy
 from vyos.config import Config
 from vyos import ConfigError
+from vyos.util import run
 
 systemd_ctrl_alt_del = '/lib/systemd/system/ctrl-alt-del.target'
 
@@ -51,9 +52,9 @@ def generate(opt):
 def apply(opt):
     # Beep action
     if opt['beep_if_fully_booted']:
-        os.system('systemctl enable vyos-beep.service >/dev/null 2>&1')
+        run('systemctl enable vyos-beep.service >/dev/null 2>&1')
     else:
-        os.system('systemctl disable vyos-beep.service >/dev/null 2>&1')
+        run('systemctl disable vyos-beep.service >/dev/null 2>&1')
 
     # Ctrl-Alt-Delete action
     if opt['ctrl_alt_del'] == 'ignore':
diff --git a/src/conf_mode/system-timezone.py b/src/conf_mode/system-timezone.py
index d715bd27e..2f8dc9e89 100755
--- a/src/conf_mode/system-timezone.py
+++ b/src/conf_mode/system-timezone.py
@@ -20,6 +20,8 @@ import os
 from copy import deepcopy
 from vyos.config import Config
 from vyos import ConfigError
+from vyos.util import run
+
 
 default_config_data = {
     'name': 'UTC'
@@ -40,9 +42,7 @@ def generate(tz):
     pass
 
 def apply(tz):
-    cmd = '/usr/bin/timedatectl set-timezone {}'.format(tz['name'])
-    os.system(cmd)
-    pass
+    run('/usr/bin/timedatectl set-timezone {}'.format(tz['name']))
 
 if __name__ == '__main__':
     try:
diff --git a/src/conf_mode/tftp_server.py b/src/conf_mode/tftp_server.py
index fe2da8455..df8155084 100755
--- a/src/conf_mode/tftp_server.py
+++ b/src/conf_mode/tftp_server.py
@@ -27,6 +27,8 @@ from vyos.config import Config
 from vyos.defaults import directories as vyos_data_dir
 from vyos.validate import is_ipv4, is_addr_assigned
 from vyos import ConfigError
+from vyos.util import run
+
 
 config_file = r'/etc/default/tftpd'
 
@@ -113,7 +115,7 @@ def generate(tftpd):
 
 def apply(tftpd):
     # stop all services first - then we will decide
-    os.system('systemctl stop tftpd@{0..20}')
+    run('systemctl stop tftpd@{0..20}')
 
     # bail out early - e.g. service deletion
     if tftpd is None:
@@ -138,7 +140,7 @@ def apply(tftpd):
 
     idx = 0
     for listen in tftpd['listen']:
-        os.system('systemctl restart tftpd@{0}.service'.format(idx))
+        run('systemctl restart tftpd@{0}.service'.format(idx))
         idx = idx + 1
 
     return None
diff --git a/src/helpers/validate-value.py b/src/helpers/validate-value.py
index 36f996d38..fab6ca81e 100755
--- a/src/helpers/validate-value.py
+++ b/src/helpers/validate-value.py
@@ -5,6 +5,8 @@ import os
 import sys
 import argparse
 
+from vyos.util import run
+
 parser = argparse.ArgumentParser()
 parser.add_argument('--regex', action='append')
 parser.add_argument('--exec', action='append')
@@ -31,7 +33,7 @@ try:
         cmd = "{0} {1}".format(cmd, args.value)
         if debug:
             print(cmd)
-        res = os.system(cmd)
+        res = run(cmd)
         if res == 0:
             sys.exit(0)
 except Exception as exn:
diff --git a/src/op_mode/connect_disconnect.py b/src/op_mode/connect_disconnect.py
index a22615096..192fd80ec 100755
--- a/src/op_mode/connect_disconnect.py
+++ b/src/op_mode/connect_disconnect.py
@@ -21,6 +21,9 @@ from sys import exit
 from psutil import process_iter
 from time import strftime, localtime, time
 
+from vyos.util import run
+
+
 PPP_LOGFILE = '/var/log/vyatta/ppp_{}.log'
 
 def check_interface(interface):
@@ -56,8 +59,7 @@ def connect(interface):
         tm = strftime("%a %d %b %Y %I:%M:%S %p %Z", localtime(time()))
         with open(PPP_LOGFILE.format(interface), 'a') as f:
             f.write('{}: user {} started PPP daemon for {} by connect command\n'.format(tm, user, interface))
-            cmd = 'umask 0; setsid sh -c "nohup /usr/sbin/pppd call {0} > /tmp/{0}.log 2>&1 &"'.format(interface)
-            os.system(cmd)
+            run('umask 0; setsid sh -c "nohup /usr/sbin/pppd call {0} > /tmp/{0}.log 2>&1 &"'.format(interface))
 
 
 def disconnect(interface):
@@ -75,8 +77,7 @@ def disconnect(interface):
         tm = strftime("%a %d %b %Y %I:%M:%S %p %Z", localtime(time()))
         with open(PPP_LOGFILE.format(interface), 'a') as f:
             f.write('{}: user {} stopped PPP daemon for {} by disconnect command\n'.format(tm, user, interface))
-            cmd = '/usr/bin/poff "{}"'.format(interface)
-            os.system(cmd)
+            run('/usr/bin/poff "{}"'.format(interface))
 
 def main():
     parser = argparse.ArgumentParser()
diff --git a/src/op_mode/dns_forwarding_reset.py b/src/op_mode/dns_forwarding_reset.py
index da4fba3a2..93c2444b9 100755
--- a/src/op_mode/dns_forwarding_reset.py
+++ b/src/op_mode/dns_forwarding_reset.py
@@ -25,6 +25,8 @@ import sys
 import argparse
 
 import vyos.config
+from vyos.util import run
+
 
 parser = argparse.ArgumentParser()
 parser.add_argument("-a", "--all", action="store_true", help="Reset all cache")
@@ -40,10 +42,10 @@ if __name__ == '__main__':
         sys.exit(0)
 
     if args.all:
-        os.system("rec_control wipe-cache \'.$\'")
+        run("rec_control wipe-cache \'.$\'")
         sys.exit(1)
     elif args.domain:
-        os.system("rec_control wipe-cache \'{0}$\'".format(args.domain))
+        run("rec_control wipe-cache \'{0}$\'".format(args.domain))
     else:
         parser.print_help()
         sys.exit(1)
diff --git a/src/op_mode/dynamic_dns.py b/src/op_mode/dynamic_dns.py
index 0d457e247..d991848ad 100755
--- a/src/op_mode/dynamic_dns.py
+++ b/src/op_mode/dynamic_dns.py
@@ -21,6 +21,8 @@ import sys
 import time
 
 from vyos.config import Config
+from vyos.util import run
+
 
 cache_file = r'/var/cache/ddclient/ddclient.cache'
 
@@ -84,9 +86,9 @@ def show_status():
 
 
 def update_ddns():
-    os.system('systemctl stop ddclient')
+    run('systemctl stop ddclient')
     os.remove(cache_file)
-    os.system('systemctl start ddclient')
+    run('systemctl start ddclient')
 
 
 def main():
diff --git a/src/op_mode/restart_dhcp_relay.py b/src/op_mode/restart_dhcp_relay.py
index ab02d1eb3..057b4dcd8 100755
--- a/src/op_mode/restart_dhcp_relay.py
+++ b/src/op_mode/restart_dhcp_relay.py
@@ -23,6 +23,8 @@ import argparse
 import os
 
 import vyos.config
+from vyos.util import run
+
 
 parser = argparse.ArgumentParser()
 parser.add_argument("--ipv4", action="store_true", help="Restart IPv4 DHCP relay")
@@ -37,7 +39,7 @@ if __name__ == '__main__':
         if not c.exists_effective('service dhcp-relay'):
             print("DHCP relay service not configured")
         else:
-            os.system('sudo systemctl restart isc-dhcp-relay.service')
+            run('sudo systemctl restart isc-dhcp-relay.service')
 
         sys.exit(0)
     elif args.ipv6:
@@ -45,7 +47,7 @@ if __name__ == '__main__':
         if not c.exists_effective('service dhcpv6-relay'):
             print("DHCPv6 relay service not configured")
         else:
-            os.system('sudo systemctl restart isc-dhcpv6-relay.service')
+            run('sudo systemctl restart isc-dhcpv6-relay.service')
 
         sys.exit(0)
     else:
diff --git a/src/op_mode/show_acceleration.py b/src/op_mode/show_acceleration.py
index 3ba0e85dd..cdd8ce037 100755
--- a/src/op_mode/show_acceleration.py
+++ b/src/op_mode/show_acceleration.py
@@ -21,6 +21,8 @@ import re
 import argparse
 import subprocess
 from vyos.config import Config
+from vyos.util import popen, run
+
 
 def detect_qat_dev():
     ret = subprocess.Popen(['sudo', 'lspci',  '-nn'], stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
@@ -97,20 +99,20 @@ args = parser.parse_args()
 if args.hw:
     detect_qat_dev()
     # Show availible Intel QAT devices
-    os.system('sudo lspci -nn | egrep -e \'8086:37c8|8086:19e2|8086:0435|8086:6f54\'')
+    run('sudo lspci -nn | egrep -e \'8086:37c8|8086:19e2|8086:0435|8086:6f54\'')
 elif args.flow and args.dev:
     check_qat_if_conf()
-    os.system('sudo cat '+get_qat_proc_path(args.dev)+"fw_counters")
+    run('sudo cat '+get_qat_proc_path(args.dev)+"fw_counters")
 elif args.interrupts:
     check_qat_if_conf()
     # Delete _dev from args.dev
-    os.system('sudo cat /proc/interrupts | grep qat')
+    run('sudo cat /proc/interrupts | grep qat')
 elif args.status:
     check_qat_if_conf()
     show_qat_status()
 elif args.conf and args.dev:
     check_qat_if_conf()
-    os.system('sudo cat '+get_qat_proc_path(args.dev)+"dev_cfg")
+    run('sudo cat '+get_qat_proc_path(args.dev)+"dev_cfg")
 elif args.dev_list:
     get_qat_devices()
 else:
diff --git a/src/op_mode/show_dhcp.py b/src/op_mode/show_dhcp.py
index f801ba753..4e3e08263 100755
--- a/src/op_mode/show_dhcp.py
+++ b/src/op_mode/show_dhcp.py
@@ -24,9 +24,12 @@ import collections
 import os
 from datetime import datetime
 
-from vyos.config import Config
 from isc_dhcp_leases import Lease, IscDhcpLeases
 
+from vyos.config import Config
+from vyos.util import run
+
+
 lease_file = "/config/dhcpd.leases"
 pool_key = "shared-networkname"
 
@@ -190,7 +193,7 @@ if __name__ == '__main__':
         sys.exit(0)
 
     # if dhcp server is down, inactive leases may still be shown as active, so warn the user.
-    if os.system('systemctl -q is-active isc-dhcpv4-server.service') != 0:
+    if run('systemctl -q is-active isc-dhcpv4-server.service') != 0:
         print("WARNING: DHCP server is configured but not started. Data may be stale.")
 
     if args.leases:
diff --git a/src/op_mode/show_dhcpv6.py b/src/op_mode/show_dhcpv6.py
index ae63af39b..4ef4849ff 100755
--- a/src/op_mode/show_dhcpv6.py
+++ b/src/op_mode/show_dhcpv6.py
@@ -24,9 +24,11 @@ import collections
 import os
 from datetime import datetime
 
-from vyos.config import Config
 from isc_dhcp_leases import Lease, IscDhcpLeases
 
+from vyos.config import Config
+from vyos.util import run
+
 lease_file = "/config/dhcpdv6.leases"
 pool_key = "shared-networkname"
 
@@ -177,7 +179,7 @@ if __name__ == '__main__':
         sys.exit(0)
 
     # if dhcp server is down, inactive leases may still be shown as active, so warn the user.
-    if os.system('systemctl -q is-active isc-dhcpv6-server.service') != 0:
+    if run('systemctl -q is-active isc-dhcpv6-server.service') != 0:
         print("WARNING: DHCPv6 server is configured but not started. Data may be stale.")
 
     if args.leases:
diff --git a/src/op_mode/snmp.py b/src/op_mode/snmp.py
index e08441f0e..b09eab97f 100755
--- a/src/op_mode/snmp.py
+++ b/src/op_mode/snmp.py
@@ -24,6 +24,7 @@ import sys
 import argparse
 
 from vyos.config import Config
+from vyos.util import run
 
 config_file_daemon = r'/etc/snmp/snmpd.conf'
 
@@ -53,7 +54,7 @@ def show_all():
 
 def show_community(c, h):
     print('Status of SNMP community {0} on {1}'.format(c, h), flush=True)
-    os.system('/usr/bin/snmpstatus -t1 -v1 -c {0} {1}'.format(c, h))
+    run('/usr/bin/snmpstatus -t1 -v1 -c {0} {1}'.format(c, h))
 
 if __name__ == '__main__':
     args = parser.parse_args()
-- 
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