Merging upstream version 1.12.0.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

4 files changed, 185 insertions, 1066 deletions

diff --git a/collectors/tc.plugin/Makefile.in b/collectors/tc.plugin/Makefile.in
deleted file mode 100644
index d336e1f0d..000000000
--- a/collectors/tc.plugin/Makefile.in
+++ /dev/null
@@ -1,562 +0,0 @@
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-	install-data-am install-dist_pluginsSCRIPTS install-dvi \
-	install-dvi-am install-exec install-exec-am install-html \
-	install-html-am install-info install-info-am install-man \
-	install-pdf install-pdf-am install-ps install-ps-am \
-	install-strip installcheck installcheck-am installdirs \
-	maintainer-clean maintainer-clean-generic mostlyclean \
-	mostlyclean-generic pdf pdf-am ps ps-am tags-am uninstall \
-	uninstall-am uninstall-dist_pluginsSCRIPTS
-
-.in:
-	if sed \
-		-e 's#[@]localstatedir_POST@#$(localstatedir)#g' \
-		-e 's#[@]sbindir_POST@#$(sbindir)#g' \
-		-e 's#[@]sysconfdir_POST@#$(sysconfdir)#g' \
-		-e 's#[@]pythondir_POST@#$(pythondir)#g' \
-		-e 's#[@]configdir_POST@#$(configdir)#g' \
-		-e 's#[@]libconfigdir_POST@#$(libconfigdir)#g' \
-		-e 's#[@]cachedir_POST@#$(cachedir)#g' \
-		$< > $@.tmp; then \
-		mv "$@.tmp" "$@"; \
-	else \
-		rm -f "$@.tmp"; \
-		false; \
-	fi
-
-# Tell versions [3.59,3.63) of GNU make to not export all variables.
-# Otherwise a system limit (for SysV at least) may be exceeded.
-.NOEXPORT:
diff --git a/collectors/tc.plugin/README.md b/collectors/tc.plugin/README.md
index a8b151de3..4dc1a1d22 100644
--- a/collectors/tc.plugin/README.md
+++ b/collectors/tc.plugin/README.md
@@ -1,4 +1,4 @@
-## tc.plugin
+# tc.plugin
 
 Live demo - **[see it in action here](https://registry.my-netdata.io/#menu_tc)** !
 
@@ -6,15 +6,11 @@ Live demo - **[see it in action here](https://registry.my-netdata.io/#menu_tc)**
 
 Netdata monitors `tc` QoS classes for all interfaces.
 
-If you also use [FireQOS](http://firehol.org/tutorial/fireqos-new-user/) it will collect
-interface and class names.
+If you also use [FireQOS](http://firehol.org/tutorial/fireqos-new-user/) it will collect interface and class names.
 
-There is a [shell helper](tc-qos-helper.sh.in) for this (all parsing is done by the plugin
-in `C` code - this shell script is just a configuration for the command to run to get `tc` output).
+There is a [shell helper](tc-qos-helper.sh.in) for this (all parsing is done by the plugin in `C` code - this shell script is just a configuration for the command to run to get `tc` output).
 
-The source of the tc plugin is [here](plugin_tc.c). It is somewhat complex, because a state
-machine was needed to keep track of all the `tc` classes, including the pseudo classes tc
-dynamically creates.
+The source of the tc plugin is [here](plugin_tc.c). It is somewhat complex, because a state machine was needed to keep track of all the `tc` classes, including the pseudo classes tc dynamically creates.
 
 ## Motivation
 
@@ -80,11 +76,16 @@ Once **traffic classification** is applied, we can use **[netdata](https://githu
 
 QoS, is extremely light. You will configure it once, and this is it. It will not bother you again and it will not use any noticeable CPU resources, especially on application and database servers.
 
----
+This is QoS from a home linux router. Check these features:
+
+1. It is real-time (per second updates)
+2. QoS really works in Linux - check that the `background` traffic is squeezed when `surfing` needs it.
 
-## QoS in Linux? Have you lost your mind?
+![test2](https://cloud.githubusercontent.com/assets/2662304/14093004/68966020-f553-11e5-98fe-ffee2086fafd.gif)
+
+---
 
-Yes I know... but no, I have not!
+## QoS in Linux?
 
 Of course, `tc` is probably **the most undocumented, complicated and unfriendly** command in Linux. 
 
@@ -108,17 +109,13 @@ For example, do you know that for matching a simple port range in `tc`, e.g. all
 32768/0x8000
 ```
 
-I know what you are thinking right now! **And I agree!**
+To do it the hard way, you can go through the [tc configuration steps](#qos-configuration-with-tc). An easier way is to use  **[FireQOS](https://firehol.org/tutorial/fireqos-new-user/)**, a tool that simplifies QoS management in Linux.
 
-This is why I wrote **[FireQOS](https://firehol.org/tutorial/fireqos-new-user/)**, a tool to simplify QoS management in Linux.
+## Qos Configuration with FireHOL
 
 The **[FireHOL](https://firehol.org/)** package already distributes **[FireQOS](https://firehol.org/tutorial/fireqos-new-user/)**. Check the **[FireQOS tutorial](https://firehol.org/tutorial/fireqos-new-user/)** to learn how to write your own QoS configuration.
 
-With **[FireQOS](https://firehol.org/tutorial/fireqos-new-user/)**, it is **really simple for everyone to use QoS in Linux**. Just install the package `firehol`. It should already be available for your distribution. If not, check the **[FireHOL Installation Guide](https://firehol.org/installing/)**. After that, you will have the `fireqos` command which uses a configuration like the following:
-
-## QoS Configuration
-
-This is the file `/etc/firehol/fireqos.conf` we use at the netdata demo site:
+With **[FireQOS](https://firehol.org/tutorial/fireqos-new-user/)**, it is **really simple for everyone to use QoS in Linux**. Just install the package `firehol`. It should already be available for your distribution. If not, check the **[FireHOL Installation Guide](https://firehol.org/installing/)**. After that, you will have the `fireqos` command which uses a configuration like the following `/etc/firehol/fireqos.conf`, used at the netdata demo site:
 
 ```sh
     # configure the netdata ports
@@ -166,15 +163,33 @@ And this is what you are going to get:
 
 ![image](https://cloud.githubusercontent.com/assets/2662304/14436322/c91d90a4-0024-11e6-9fb1-57cdef1580df.png)
 
----
-
-## More examples:
+## QoS Configuration with tc
+
+First, setup the tc rules in rc.local using commands to assign different DSCP markings to different classids. You can see one such example in [github issue #4563](https://github.com/netdata/netdata/issues/4563#issuecomment-455711973). 
+
+Then, map the classids to names by creating `/etc/iproute2/tc_cls`. For example:
+```2:1 Standard
+2:8 LowPriorityData
+2:10 HighThroughputData
+2:16 OAM
+2:18 LowLatencyData
+2:24 BroadcastVideo
+2:26 MultimediaStreaming
+2:32 RealTimeInteractive
+2:34 MultimediaConferencing
+2:40 Signalling
+2:46 Telephony
+2:48 NetworkControl
+```
 
-This is QoS from my home linux router. Check these features:
+Add the following configuration option in `/etc/netdata.conf`:
+```[plugin:tc]
+        enable show all classes and qdiscs for all interfaces = yes
+```
 
-1. It is real-time (per second updates)
-2. QoS really works in Linux - check that the `background` traffic is squeezed when `surfing` needs it.
+Finally, create `/etc/netdata/tc-qos-helper.conf` with this content:
+```tc_show="class"```
 
-![test2](https://cloud.githubusercontent.com/assets/2662304/14093004/68966020-f553-11e5-98fe-ffee2086fafd.gif)
 
 
+[![analytics](https://www.google-analytics.com/collect?v=1&aip=1&t=pageview&_s=1&ds=github&dr=https%3A%2F%2Fgithub.com%2Fnetdata%2Fnetdata&dl=https%3A%2F%2Fmy-netdata.io%2Fgithub%2Fcollectors%2Ftc.plugin%2FREADME&_u=MAC~&cid=5792dfd7-8dc4-476b-af31-da2fdb9f93d2&tid=UA-64295674-3)]()
diff --git a/collectors/tc.plugin/tc-qos-helper.sh b/collectors/tc.plugin/tc-qos-helper.sh
deleted file mode 100644
index a1a2b9145..000000000
--- a/collectors/tc.plugin/tc-qos-helper.sh
+++ /dev/null
@@ -1,315 +0,0 @@
-#!/usr/bin/env bash
-
-# netdata
-# real-time performance and health monitoring, done right!
-# (C) 2017 Costa Tsaousis <costa@tsaousis.gr>
-# SPDX-License-Identifier: GPL-3.0-or-later
-#
-# This script is a helper to allow netdata collect tc data.
-# tc output parsing has been implemented in C, inside netdata
-# This script allows setting names to dimensions.
-
-export PATH="${PATH}:/sbin:/usr/sbin:/usr/local/sbin"
-export LC_ALL=C
-
-
-# -----------------------------------------------------------------------------
-# logging functions
-
-PROGRAM_FILE="$0"
-PROGRAM_NAME="$(basename $0)"
-PROGRAM_NAME="${PROGRAM_NAME/.plugin}"
-
-logdate() {
-    date "+%Y-%m-%d %H:%M:%S"
-}
-
-log() {
-    local status="${1}"
-    shift
-
-    echo >&2 "$(logdate): ${PROGRAM_NAME}: ${status}: ${*}"
-
-}
-
-warning() {
-    log WARNING "${@}"
-}
-
-error() {
-    log ERROR "${@}"
-}
-
-info() {
-    log INFO "${@}"
-}
-
-fatal() {
-    log FATAL "${@}"
-    exit 1
-}
-
-debug=0
-debug() {
-    [ $debug -eq 1 ] && log DEBUG "${@}"
-}
-
-# -----------------------------------------------------------------------------
-# find /var/run/fireqos
-
-# the default
-fireqos_run_dir="/var/run/fireqos"
-
-function realdir {
-    local r="$1"
-    local t=$(readlink "$r")
-
-    while [ "$t" ]
-        do
-        r=$(cd $(dirname "$r") && cd $(dirname "$t") && pwd -P)/$(basename "$t")
-        t=$(readlink "$r")
-    done
-
-    dirname "$r"
-}
-
-if [ ! -d "${fireqos_run_dir}" ]
-    then
-
-    # the fireqos executable - we will use it to find its config
-    fireqos="$(which fireqos 2>/dev/null || command -v fireqos 2>/dev/null)"
-
-    if [ ! -z "${fireqos}" ]
-        then
-
-        fireqos_exec_dir="$(realdir ${fireqos})"
-
-        if [ ! -z "${fireqos_exec_dir}" -a "${fireqos_exec_dir}" != "." -a -f "${fireqos_exec_dir}/install.config" ]
-            then
-
-            LOCALSTATEDIR=
-            source "${fireqos_exec_dir}/install.config"
-
-            if [ -d "${LOCALSTATEDIR}/run/fireqos" ]
-                then
-                fireqos_run_dir="${LOCALSTATEDIR}/run/fireqos"
-            else
-                warning "FireQoS is installed as '${fireqos}', its installation config at '${fireqos_exec_dir}/install.config' specifies local state data at '${LOCALSTATEDIR}/run/fireqos', but this directory is not found or is not readable (check the permissions of its parents)."
-            fi
-        else
-            warning "Although FireQoS is installed on this system as '${fireqos}', I cannot find/read its installation configuration at '${fireqos_exec_dir}/install.config'."
-        fi
-    else
-        warning "FireQoS is not installed on this system. Use FireQoS to apply traffic QoS and expose the class names to netdata. Check https://github.com/netdata/netdata/tree/master/collectors/tc.plugin#tcplugin"
-    fi
-fi
-
-# -----------------------------------------------------------------------------
-
-[ -z "${NETDATA_PLUGINS_DIR}" ] && NETDATA_PLUGINS_DIR="$(dirname "${0}")"
-[ -z "${NETDATA_USER_CONFIG_DIR}"  ] && NETDATA_USER_CONFIG_DIR="/usr/local/etc/netdata"
-[ -z "${NETDATA_STOCK_CONFIG_DIR}" ] && NETDATA_STOCK_CONFIG_DIR="/usr/local/lib/netdata/conf.d"
-
-plugins_dir="${NETDATA_PLUGINS_DIR}"
-tc="$(which tc 2>/dev/null || command -v tc 2>/dev/null)"
-
-
-# -----------------------------------------------------------------------------
-# user configuration
-
-# time in seconds to refresh QoS class/qdisc names
-qos_get_class_names_every=120
-
-# time in seconds to exit - netdata will restart the script
-qos_exit_every=3600
-
-# what to use? classes or qdiscs?
-tc_show="qdisc" # can also be "class"
-
-
-# -----------------------------------------------------------------------------
-# check if we have a valid number for interval
-
-t=${1}
-update_every=$((t))
-[ $((update_every)) -lt 1 ] && update_every=${NETDATA_UPDATE_EVERY}
-[ $((update_every)) -lt 1 ] && update_every=1
-
-
-# -----------------------------------------------------------------------------
-# allow the user to override our defaults
-
-for CONFIG in "${NETDATA_STOCK_CONFIG_DIR}/tc-qos-helper.conf" "${NETDATA_USER_CONFIG_DIR}/tc-qos-helper.conf"
-do
-    if [ -f "${CONFIG}" ]
-        then
-        info "Loading config file '${CONFIG}'..."
-        source "${CONFIG}"
-        [ $? -ne 0 ] && error "Failed to load config file '${CONFIG}'."
-    else
-        warning "Cannot find file '${CONFIG}'."
-    fi
-done
-
-case "${tc_show}" in
-    qdisc|class)
-        ;;
-
-    *)
-        error "tc_show variable can be either 'qdisc' or 'class' but is set to '${tc_show}'. Assuming it is 'qdisc'."
-        tc_show="qdisc"
-        ;;
-esac
-
-
-# -----------------------------------------------------------------------------
-# default sleep function
-
-LOOPSLEEPMS_LASTWORK=0
-loopsleepms() {
-    sleep $1
-}
-
-# if found and included, this file overwrites loopsleepms()
-# with a high resolution timer function for precise looping.
-. "${plugins_dir}/loopsleepms.sh.inc"
-
-
-# -----------------------------------------------------------------------------
-# final checks we can run
-
-if [ -z "${tc}" -o ! -x "${tc}" ]
-    then
-    fatal "cannot find command 'tc' in this system."
-fi
-
-tc_devices=
-fix_names=
-
-# -----------------------------------------------------------------------------
-
-setclassname() {
-    if [ "${tc_show}" = "qdisc" ]
-        then
-        echo "SETCLASSNAME $4 $2"
-    else
-        echo "SETCLASSNAME $3 $2"
-    fi
-}
-
-show_tc_cls() {
-    [ "${tc_show}" = "qdisc" ] && return 1
-
-    local x="${1}"
-
-    if [ -f /etc/iproute2/tc_cls ]
-    then
-        local classid name rest
-        while read classid name rest
-        do
-            [ -z "${classid}" -o -z "${name}" -o "${classid}" = "#" -o "${name}" = "#" -o "${classid:0:1}" = "#" -o "${name:0:1}" = "#" ] && continue
-            setclassname "" "${name}" "${classid}"
-        done </etc/iproute2/tc_cls
-        return 0
-    fi
-    return 1
-}
-
-show_fireqos_names() {
-    local x="${1}" name n interface_dev interface_classes interface_classes_monitor
-
-    if [ -f "${fireqos_run_dir}/ifaces/${x}" ]
-    then
-        name="$(<"${fireqos_run_dir}/ifaces/${x}")"
-        echo "SETDEVICENAME ${name}"
-
-        interface_dev=
-        interface_classes=
-        interface_classes_monitor=
-        source "${fireqos_run_dir}/${name}.conf"
-        for n in ${interface_classes_monitor}
-        do
-            setclassname ${n//|/ }
-        done
-        [ ! -z "${interface_dev}" ] && echo "SETDEVICEGROUP ${interface_dev}"
-
-        return 0
-    fi
-
-    return 1
-}
-
-show_tc() {
-    local x="${1}"
-
-    echo "BEGIN ${x}"
-
-    # netdata can parse the output of tc
-    ${tc} -s ${tc_show} show dev ${x}
-
-    # check FireQOS names for classes
-    if [ ! -z "${fix_names}" ]
-    then
-        show_fireqos_names "${x}" || show_tc_cls "${x}"
-    fi
-
-    echo "END ${x}"
-}
-
-find_tc_devices() {
-    local count=0 devs= dev rest l
-
-    # find all the devices in the system
-    # without forking
-    while IFS=":| " read dev rest
-    do
-        count=$((count + 1))
-        [ ${count} -le 2 ] && continue
-        devs="${devs} ${dev}"
-    done </proc/net/dev
-
-    # from all the devices find the ones
-    # that have QoS defined
-    # unfortunately, one fork per device cannot be avoided
-    tc_devices=
-    for dev in ${devs}
-    do
-        l="$(${tc} class show dev ${dev} 2>/dev/null)"
-        [ ! -z "${l}" ] && tc_devices="${tc_devices} ${dev}"
-    done
-}
-
-# update devices and class names
-# once every 2 minutes
-names_every=$((qos_get_class_names_every / update_every))
-
-# exit this script every hour
-# it will be restarted automatically
-exit_after=$((qos_exit_every / update_every))
-
-c=0
-gc=0
-while [ 1 ]
-do
-    fix_names=
-    c=$((c + 1))
-    gc=$((gc + 1))
-
-    if [ ${c} -le 1 -o ${c} -ge ${names_every} ]
-    then
-        c=1
-        fix_names="YES"
-        find_tc_devices
-    fi
-
-    for d in ${tc_devices}
-    do
-        show_tc ${d}
-    done
-
-    echo "WORKTIME ${LOOPSLEEPMS_LASTWORK}"
-
-    loopsleepms ${update_every}
-
-    [ ${gc} -gt ${exit_after} ] && exit 0
-done
diff --git a/collectors/tc.plugin/tc-qos-helper.sh.in b/collectors/tc.plugin/tc-qos-helper.sh.in
index a15eab899..01353be45 100755
--- a/collectors/tc.plugin/tc-qos-helper.sh.in
+++ b/collectors/tc.plugin/tc-qos-helper.sh.in
@@ -12,46 +12,44 @@
 export PATH="${PATH}:/sbin:/usr/sbin:/usr/local/sbin"
 export LC_ALL=C
 
-
 # -----------------------------------------------------------------------------
 # logging functions
 
-PROGRAM_FILE="$0"
-PROGRAM_NAME="$(basename $0)"
-PROGRAM_NAME="${PROGRAM_NAME/.plugin}"
+PROGRAM_NAME="$(basename "$0")"
+PROGRAM_NAME="${PROGRAM_NAME/.plugin/}"
 
 logdate() {
-    date "+%Y-%m-%d %H:%M:%S"
+	date "+%Y-%m-%d %H:%M:%S"
 }
 
 log() {
-    local status="${1}"
-    shift
+	local status="${1}"
+	shift
 
-    echo >&2 "$(logdate): ${PROGRAM_NAME}: ${status}: ${*}"
+	echo >&2 "$(logdate): ${PROGRAM_NAME}: ${status}: ${*}"
 
 }
 
 warning() {
-    log WARNING "${@}"
+	log WARNING "${@}"
 }
 
 error() {
-    log ERROR "${@}"
+	log ERROR "${@}"
 }
 
 info() {
-    log INFO "${@}"
+	log INFO "${@}"
 }
 
 fatal() {
-    log FATAL "${@}"
-    exit 1
+	log FATAL "${@}"
+	exit 1
 }
 
 debug=0
 debug() {
-    [ $debug -eq 1 ] && log DEBUG "${@}"
+	[ $debug -eq 1 ] && log DEBUG "${@}"
 }
 
 # -----------------------------------------------------------------------------
@@ -60,59 +58,55 @@ debug() {
 # the default
 fireqos_run_dir="/var/run/fireqos"
 
-function realdir {
-    local r="$1"
-    local t=$(readlink "$r")
+function realdir() {
+	local r
+	local t
+	r="$1"
+	t="$(readlink "$r")"
 
-    while [ "$t" ]
-        do
-        r=$(cd $(dirname "$r") && cd $(dirname "$t") && pwd -P)/$(basename "$t")
-        t=$(readlink "$r")
-    done
+	while [ "$t" ]; do
+		r=$(cd "$(dirname "$r")" && cd "$(dirname "$t")" && pwd -P)/$(basename "$t")
+		t=$(readlink "$r")
+	done
 
-    dirname "$r"
+	dirname "$r"
 }
 
-if [ ! -d "${fireqos_run_dir}" ]
-    then
-
-    # the fireqos executable - we will use it to find its config
-    fireqos="$(which fireqos 2>/dev/null || command -v fireqos 2>/dev/null)"
+if [ ! -d "${fireqos_run_dir}" ]; then
 
-    if [ ! -z "${fireqos}" ]
-        then
+	# the fireqos executable - we will use it to find its config
+	fireqos="$(command -v fireqos 2>/dev/null)"
 
-        fireqos_exec_dir="$(realdir ${fireqos})"
+	if [ -n "${fireqos}" ]; then
 
-        if [ ! -z "${fireqos_exec_dir}" -a "${fireqos_exec_dir}" != "." -a -f "${fireqos_exec_dir}/install.config" ]
-            then
+		fireqos_exec_dir="$(realdir "${fireqos}")"
 
-            LOCALSTATEDIR=
-            source "${fireqos_exec_dir}/install.config"
+		if [ -n "${fireqos_exec_dir}" ] && [ "${fireqos_exec_dir}" != "." ] && [ -f "${fireqos_exec_dir}/install.config" ]; then
+			LOCALSTATEDIR=
+			#shellcheck source=/dev/null
+			source "${fireqos_exec_dir}/install.config"
 
-            if [ -d "${LOCALSTATEDIR}/run/fireqos" ]
-                then
-                fireqos_run_dir="${LOCALSTATEDIR}/run/fireqos"
-            else
-                warning "FireQoS is installed as '${fireqos}', its installation config at '${fireqos_exec_dir}/install.config' specifies local state data at '${LOCALSTATEDIR}/run/fireqos', but this directory is not found or is not readable (check the permissions of its parents)."
-            fi
-        else
-            warning "Although FireQoS is installed on this system as '${fireqos}', I cannot find/read its installation configuration at '${fireqos_exec_dir}/install.config'."
-        fi
-    else
-        warning "FireQoS is not installed on this system. Use FireQoS to apply traffic QoS and expose the class names to netdata. Check https://github.com/netdata/netdata/tree/master/collectors/tc.plugin#tcplugin"
-    fi
+			if [ -d "${LOCALSTATEDIR}/run/fireqos" ]; then
+				fireqos_run_dir="${LOCALSTATEDIR}/run/fireqos"
+			else
+				warning "FireQoS is installed as '${fireqos}', its installation config at '${fireqos_exec_dir}/install.config' specifies local state data at '${LOCALSTATEDIR}/run/fireqos', but this directory is not found or is not readable (check the permissions of its parents)."
+			fi
+		else
+			warning "Although FireQoS is installed on this system as '${fireqos}', I cannot find/read its installation configuration at '${fireqos_exec_dir}/install.config'."
+		fi
+	else
+		warning "FireQoS is not installed on this system. Use FireQoS to apply traffic QoS and expose the class names to netdata. Check https://github.com/netdata/netdata/tree/master/collectors/tc.plugin#tcplugin"
+	fi
 fi
 
 # -----------------------------------------------------------------------------
 
 [ -z "${NETDATA_PLUGINS_DIR}" ] && NETDATA_PLUGINS_DIR="$(dirname "${0}")"
-[ -z "${NETDATA_USER_CONFIG_DIR}"  ] && NETDATA_USER_CONFIG_DIR="@configdir_POST@"
+[ -z "${NETDATA_USER_CONFIG_DIR}" ] && NETDATA_USER_CONFIG_DIR="@configdir_POST@"
 [ -z "${NETDATA_STOCK_CONFIG_DIR}" ] && NETDATA_STOCK_CONFIG_DIR="@libconfigdir_POST@"
 
 plugins_dir="${NETDATA_PLUGINS_DIR}"
-tc="$(which tc 2>/dev/null || command -v tc 2>/dev/null)"
-
+tc="$(command -v tc 2>/dev/null)"
 
 # -----------------------------------------------------------------------------
 # user configuration
@@ -126,7 +120,6 @@ qos_exit_every=3600
 # what to use? classes or qdiscs?
 tc_show="qdisc" # can also be "class"
 
-
 # -----------------------------------------------------------------------------
 # check if we have a valid number for interval
 
@@ -135,52 +128,46 @@ update_every=$((t))
 [ $((update_every)) -lt 1 ] && update_every=${NETDATA_UPDATE_EVERY}
 [ $((update_every)) -lt 1 ] && update_every=1
 
-
 # -----------------------------------------------------------------------------
 # allow the user to override our defaults
 
-for CONFIG in "${NETDATA_STOCK_CONFIG_DIR}/tc-qos-helper.conf" "${NETDATA_USER_CONFIG_DIR}/tc-qos-helper.conf"
-do
-    if [ -f "${CONFIG}" ]
-        then
-        info "Loading config file '${CONFIG}'..."
-        source "${CONFIG}"
-        [ $? -ne 0 ] && error "Failed to load config file '${CONFIG}'."
-    else
-        warning "Cannot find file '${CONFIG}'."
-    fi
+for CONFIG in "${NETDATA_STOCK_CONFIG_DIR}/tc-qos-helper.conf" "${NETDATA_USER_CONFIG_DIR}/tc-qos-helper.conf"; do
+	if [ -f "${CONFIG}" ]; then
+		info "Loading config file '${CONFIG}'..."
+		#shellcheck source=/dev/null
+		source "${CONFIG}" || error "Failed to load config file '${CONFIG}'."
+	else
+		warning "Cannot find file '${CONFIG}'."
+	fi
 done
 
 case "${tc_show}" in
-    qdisc|class)
-        ;;
+qdisc | class) ;;
 
-    *)
-        error "tc_show variable can be either 'qdisc' or 'class' but is set to '${tc_show}'. Assuming it is 'qdisc'."
-        tc_show="qdisc"
-        ;;
+*)
+	error "tc_show variable can be either 'qdisc' or 'class' but is set to '${tc_show}'. Assuming it is 'qdisc'."
+	tc_show="qdisc"
+	;;
 esac
 
-
 # -----------------------------------------------------------------------------
 # default sleep function
 
 LOOPSLEEPMS_LASTWORK=0
 loopsleepms() {
-    sleep $1
+	sleep "$1"
 }
 
 # if found and included, this file overwrites loopsleepms()
 # with a high resolution timer function for precise looping.
+#shellcheck source=/dev/null
 . "${plugins_dir}/loopsleepms.sh.inc"
 
-
 # -----------------------------------------------------------------------------
 # final checks we can run
 
-if [ -z "${tc}" -o ! -x "${tc}" ]
-    then
-    fatal "cannot find command 'tc' in this system."
+if [ -z "${tc}" ] || [ ! -x "${tc}" ]; then
+	fatal "cannot find command 'tc' in this system."
 fi
 
 tc_devices=
@@ -189,94 +176,91 @@ fix_names=
 # -----------------------------------------------------------------------------
 
 setclassname() {
-    if [ "${tc_show}" = "qdisc" ]
-        then
-        echo "SETCLASSNAME $4 $2"
-    else
-        echo "SETCLASSNAME $3 $2"
-    fi
+	if [ "${tc_show}" = "qdisc" ]; then
+		echo "SETCLASSNAME $4 $2"
+	else
+		echo "SETCLASSNAME $3 $2"
+	fi
 }
 
 show_tc_cls() {
-    [ "${tc_show}" = "qdisc" ] && return 1
-
-    local x="${1}"
-
-    if [ -f /etc/iproute2/tc_cls ]
-    then
-        local classid name rest
-        while read classid name rest
-        do
-            [ -z "${classid}" -o -z "${name}" -o "${classid}" = "#" -o "${name}" = "#" -o "${classid:0:1}" = "#" -o "${name:0:1}" = "#" ] && continue
-            setclassname "" "${name}" "${classid}"
-        done </etc/iproute2/tc_cls
-        return 0
-    fi
-    return 1
+	[ "${tc_show}" = "qdisc" ] && return 1
+
+	local x="${1}"
+
+	if [ -f /etc/iproute2/tc_cls ]; then
+		local classid name rest
+		while read -r classid name rest; do
+			if [ -z "${classid}" ] ||
+				[ -z "${name}" ] ||
+				[ "${classid}" = "#" ] ||
+				[ "${name}" = "#" ] ||
+				[ "${classid:0:1}" = "#" ] ||
+				[ "${name:0:1}" = "#" ]; then
+				continue
+			fi
+			setclassname "" "${name}" "${classid}"
+		done </etc/iproute2/tc_cls
+		return 0
+	fi
+	return 1
 }
 
 show_fireqos_names() {
-    local x="${1}" name n interface_dev interface_classes interface_classes_monitor
-
-    if [ -f "${fireqos_run_dir}/ifaces/${x}" ]
-    then
-        name="$(<"${fireqos_run_dir}/ifaces/${x}")"
-        echo "SETDEVICENAME ${name}"
-
-        interface_dev=
-        interface_classes=
-        interface_classes_monitor=
-        source "${fireqos_run_dir}/${name}.conf"
-        for n in ${interface_classes_monitor}
-        do
-            setclassname ${n//|/ }
-        done
-        [ ! -z "${interface_dev}" ] && echo "SETDEVICEGROUP ${interface_dev}"
-
-        return 0
-    fi
-
-    return 1
+	local x="${1}" name n interface_dev interface_classes_monitor
+
+	if [ -f "${fireqos_run_dir}/ifaces/${x}" ]; then
+		name="$(<"${fireqos_run_dir}/ifaces/${x}")"
+		echo "SETDEVICENAME ${name}"
+
+		#shellcheck source=/dev/null
+		source "${fireqos_run_dir}/${name}.conf"
+		for n in ${interface_classes_monitor}; do
+			setclassname ${n//|/ }
+		done
+		[ -n "${interface_dev}" ] && echo "SETDEVICEGROUP ${interface_dev}"
+
+		return 0
+	fi
+
+	return 1
 }
 
 show_tc() {
-    local x="${1}"
+	local x="${1}"
 
-    echo "BEGIN ${x}"
+	echo "BEGIN ${x}"
 
-    # netdata can parse the output of tc
-    ${tc} -s ${tc_show} show dev ${x}
+	# netdata can parse the output of tc
+	${tc} -s ${tc_show} show dev "${x}"
 
-    # check FireQOS names for classes
-    if [ ! -z "${fix_names}" ]
-    then
-        show_fireqos_names "${x}" || show_tc_cls "${x}"
-    fi
+	# check FireQOS names for classes
+	if [ -n "${fix_names}" ]; then
+		show_fireqos_names "${x}" || show_tc_cls "${x}"
+	fi
 
-    echo "END ${x}"
+	echo "END ${x}"
 }
 
 find_tc_devices() {
-    local count=0 devs= dev rest l
-
-    # find all the devices in the system
-    # without forking
-    while IFS=":| " read dev rest
-    do
-        count=$((count + 1))
-        [ ${count} -le 2 ] && continue
-        devs="${devs} ${dev}"
-    done </proc/net/dev
-
-    # from all the devices find the ones
-    # that have QoS defined
-    # unfortunately, one fork per device cannot be avoided
-    tc_devices=
-    for dev in ${devs}
-    do
-        l="$(${tc} class show dev ${dev} 2>/dev/null)"
-        [ ! -z "${l}" ] && tc_devices="${tc_devices} ${dev}"
-    done
+	local count=0 devs dev rest l
+
+	# find all the devices in the system
+	# without forking
+	while IFS=":| " read -r dev rest; do
+		count=$((count + 1))
+		[ ${count} -le 2 ] && continue
+		devs="${devs} ${dev}"
+	done </proc/net/dev
+
+	# from all the devices find the ones
+	# that have QoS defined
+	# unfortunately, one fork per device cannot be avoided
+	tc_devices=
+	for dev in ${devs}; do
+		l="$(${tc} class show dev "${dev}" 2>/dev/null)"
+		[ -n "${l}" ] && tc_devices="${tc_devices} ${dev}"
+	done
 }
 
 # update devices and class names
@@ -289,27 +273,24 @@ exit_after=$((qos_exit_every / update_every))
 
 c=0
 gc=0
-while [ 1 ]
-do
-    fix_names=
-    c=$((c + 1))
-    gc=$((gc + 1))
+while true; do
+	fix_names=
+	c=$((c + 1))
+	gc=$((gc + 1))
 
-    if [ ${c} -le 1 -o ${c} -ge ${names_every} ]
-    then
-        c=1
-        fix_names="YES"
-        find_tc_devices
-    fi
+	if [ ${c} -le 1 ] || [ ${c} -ge ${names_every} ]; then
+		c=1
+		fix_names="YES"
+		find_tc_devices
+	fi
 
-    for d in ${tc_devices}
-    do
-        show_tc ${d}
-    done
+	for d in ${tc_devices}; do
+		show_tc "${d}"
+	done
 
-    echo "WORKTIME ${LOOPSLEEPMS_LASTWORK}"
+	echo "WORKTIME ${LOOPSLEEPMS_LASTWORK}"
 
-    loopsleepms ${update_every}
+	loopsleepms ${update_every}
 
-    [ ${gc} -gt ${exit_after} ] && exit 0
+	[ ${gc} -gt ${exit_after} ] && exit 0
 done