systemd-shell-wrapper.bash

if [[ -f /etc/systemd/shell-wrapper.conf ]]; then
	source /etc/systemd/shell-wrapper.conf
else
	HIDEDAEMONS=()
fi

_systemctl="/usr/bin/systemctl" # some people seem to not have /usr/bin in $PATH when using sudo
_journalctl="/usr/bin/journalctl"

s.start()       { s_systemctl "start"   $1; }
s.stop()        { s_systemctl "stop"    $1; }
s.restart()     { s_systemctl "restart" $1; }
s.reload()      { s_systemctl "reload"  $1; }
s.enable()      { s_systemctl "enable"  $1; }
s.disable()     { s_systemctl "disable" $1; }
s.status()      { s_systemctl "status"  $1; }
s.listfailed()  { $_systemctl --failed; }
s.analyze()     { systemd-analyze $*; }
s.wants()       { $_systemctl show -p "Wants" $1; }
s.logsize()     { s_exec "${_journalctl}"" --disk-usage"; }
s.list()        { s_list_services "list"; }
s.log()         { s_journalctl "$@"; }
s.tree()        { s_exec "systemd-cgls --all"; }

# Function to unify regex matching, so we don't have to duplicate
# the regular expression. It returns the success of failure in matching $1
# $1: unit name to match 
s_match_unit_name() {
	# ^(([^@.]*)(@([^.]*))?)(\.(.*))?$
	# ([^@.]*) = matches any starting character that is not a @ and a .
	#            This is the unit name, per se.
	# (@([^.]*))? = matches any template parameter, if present.
	# (\.(.*))? = matches the service type, if present.
	# The array BASH_REMATCH will be fileed with the following elements,
	# if the match happens:
	# 0: the whole unit name
	# 1: the unit name, with possible template parameter
	# 2: the basic unit name, without parameter
	# 3: @<template parameter>
	# 4: <template parameter>
	# 5: .<unit type>
	# 6: <unit type>
	[[ "$1" =~ ^(([^@.]*)(@([^.]*))?)(\.(.*))?$ ]]
}

# $1 unit name, with possible type
# $2 default unit type, to be returned if not found in $1
s_get_unit_type() {
	local defType=${2:-service}
	if s_match_unit_name "$1"; then
		echo "${BASH_REMATCH[6]:-$defType}"
	fi
}

# $1 unit name, with possible template parameter
s_get_template_parameter() {
	if s_match_unit_name "$1"; then
		echo "${BASH_REMATCH[4]}"
	fi
}

# Returns the pure unit name and optional template parameter
# $1 input unit name, with possible "address" and type
s_get_unit_name() {
	if s_match_unit_name "$1"; then
		echo "${BASH_REMATCH[1]}"
	fi
}

# Returns the unit name, without any template parameter and unit type
s_get_basic_unit_name() {
	if s_match_unit_name "$1"; then
		echo "${BASH_REMATCH[2]}"
	fi
}

s_systemctl() {
	unitType="$(s_get_unit_type $2 $3)"
	unitName="$(s_get_unit_name $2)"
	daemon="$unitName.$unitType"
	if [[ $(s_daemon_exists $daemon $unitType) == 1 ]]; then echo -e "\e[1;31m:: \e[1;37m $daemon daemon does not exist\e[0m"; return; fi
	s_exec "/bin/true" # if sudo then ask for password now to avoid messing up the output later
	case $1 in
		start|stop|restart|reload)
			systemctl -q is-active "${daemon}" >& /dev/null
			if [[ $? -eq 0 ]]; then
				if [[ "$1" == "start" ]]; then echo -e "\e[1;31m:: \e[1;37m $daemon daemon is already running\e[0m"; return; fi
			else
				if [[ "$1" != "start" ]]; then
					echo -e "\e[1;31m:: \e[1;37m $daemon daemon is not running\e[0m"; 
					if [[ "$1" != "restart" ]]; then return; fi
				fi
			fi
			if [[ "$1" == "start" ]];   then echo -en "\e[1;34m:: \e[1;37m Starting $daemon daemon\e[0m"; cols=25; fi
			if [[ "$1" == "stop" ]];    then echo -en "\e[1;34m:: \e[1;37m Stopping $daemon daemon\e[0m"; cols=25; fi
			if [[ "$1" == "restart" ]]; then echo -en "\e[1;34m:: \e[1;37m Restarting $daemon daemon\e[0m"; cols=27; fi
			if [[ "$1" == "reload" ]];  then echo -en "\e[1;34m:: \e[1;37m Reloading $daemon daemon\e[0m"; cols=26; fi
			s_exec "${_systemctl} -q ${1} ${daemon}"
			if [[ $? -eq 0 ]]; then s_msg $daemon $cols 7 "DONE"; else s_msg $daemon $cols 1 "FAIL"; s_systemctl "status" $daemon; fi
			;;
		enable|disable)
			if [[ ! "${daemon}" =~ @ ]]; then # sadly is-enabled does not work as expected for "@" services like dhcpcd@eth0
				if ${_systemctl} -q is-enabled "${daemon}" >& /dev/null; then
					if [[ "$1" == "enable" ]]; then echo -e "\e[1;31m:: \e[1;37m $daemon daemon is already enabled\e[0m"; return; fi
				else
					if [[ "$1" == "disable" ]]; then echo -e "\e[1;31m:: \e[1;37m $daemon daemon is not enabled\e[0m"; return; fi
				fi
			fi
			f=${1:0:1}
			echo -en "\e[1;34m:: \e[1;37m ""${f^^}""${1:1:${#1}-2}""ing $daemon daemon\e[0m"
			if [[ "$1" == "enable" ]]; then cols=25; else cols=26; fi
			s_exec "${_systemctl} -q ${1} ${daemon}"
			if [[ $? -eq 0 ]]; then s_msg $daemon $cols 7 "DONE"; else s_msg $daemon $cols 1 "FAIL"; fi
			;;
		status)	
			${_systemctl} status ${daemon}
			;;
	esac
}

s_journalctl() {
	unitType="$(s_get_unit_type $1)"
	unitName="$(s_get_unit_name $1)"
	daemon="$unitName.$unitType"
	if [[ $(s_daemon_exists "${daemon}" $unitType) == 0 ]]; then
		options=""; for ((i=1; i<$#; ++i )) ; do options="${options}""${!i}"" "; done
		s_exec "${_journalctl} --all $options _SYSTEMD_UNIT=${daemon}";
	else
		s_exec "${_journalctl} --all $*";
	fi
}

s_list_services () { $_systemctl --no-legend -t service list-unit-files | grep -v static  \
	|	{ 
			while read -r service daemonstate ; do
				
				# ignore symlinks like crond.service (they dont work anyway, you can start/stop but not enable/disable)
				if [[ -h "/usr/lib/systemd/system/$service" ]]; then continue; fi
				
				# support for "@" stuff like dhcpcd@eth0 dhcpcd@eth1 ...
				daemon="${service}"
				if [[ "${daemon:${#daemon}-1}" == "@" ]]; then
					if s_hidedaemon ${daemon}; then continue; fi;
					daemons=$(${_systemctl} --no-legend -t service | grep -o "${daemon}[A-Za-z0-9_/=:-]*")
					if [[ "${daemons[0]}" == "" ]]; then daemons=($daemon); fi # when no instance of "@" service is started it appears just as dhcpcd@
				else
					daemons=($daemon)
				fi
				
				for daemon in $daemons; do
					if s_hidedaemon ${daemon}; then continue; fi;
					if [[ "${1}" == "list" ]]; then
						echo -en "\e[1;34m[";
					elif [[ "${1}" == "enabled" || "${1}" == "disabled" ]]; then
						if [[ "${1}" == "${daemonstate}" ]]; then printf "%s\n" "${daemon}"; fi
						continue
					fi
					${_systemctl} -q is-active "${daemon}" >& /dev/null
					if [[ $? -eq 0 ]]; then
							if [[ "${1}" == "list" ]]; then
								echo -en "\e[1;37mSTARTED"
							else
								if [[ "${1}" != "stopped" ]]; then printf "%s\n" "${daemon}"; fi
							fi
					else
							if [[ "${1}" == "list" ]]; then
								echo -en "\e[1;31mSTOPPED"
							else
								if [[ "${1}" != "started" ]]; then printf "%s\n" "${daemon}"; fi
							fi
					fi
					if [[ "${1}" != "list" ]]; then continue; fi
					echo -en "\e[1;34m][\e[1;37m"

					# !!! in the rare case of having two or more "@" instances (dhcpcd@) from the same service having different states (en/disabled) this actually shows wrong results
					if [[ "${daemonstate}" == "enabled" ]]; then
							echo -n "AUTO"
					else
							echo -n "    "
					fi
					echo -en "\e[1;34m]\e[0m "
					echo "$daemon"
				done

			done;
		}
}

# $1: Optional type of unit. The default is service
s_daemon_exists() {
	unitType="$(s_get_unit_type $1 ${2:-service})"
	baseName="$(s_get_basic_unit_name $1)"
	if ${_systemctl} --no-legend -t "$unitType" list-unit-files | grep -v static | (grep -Eq "^$baseName(@.*)?\.$unitType" >& /dev/null); then echo 0; else echo 1; fi
}

s_msg() {
	printf "%s%*s%s%s%s%s%s%s\n" "$(tput bold ; tput setaf 4)" $(($(tput cols)-${#1}-${2})) "[" "$(tput bold ; tput setaf $3)" "${4}" "$(tput bold ; tput setaf 4)" "]" "$(tput sgr0)"
}

s_exec() {
	if [[ $EUID -ne 0 ]]; then eval "sudo $@"; else eval "$@"; fi
}

s_hidedaemon() {
	for hidedaemon in ${HIDEDAEMONS[@]}; do if [[ "$1" == "$hidedaemon" ]]; then return 0; fi; done; return 1;
}

# $1: optional type
s_bashcompletion_list_by_type () { 
	unitType=$(get_unity_type "$1" service)
	${_systemctl} --no-legend -t $unitType list-unit-files  \
		|	{ while read -r a b  ; do printf "%s\n" "${a}"; done; }
}

s_bashcompletion () {
	local cur=${COMP_WORDS[COMP_CWORD]} prev=${COMP_WORDS[COMP_CWORD-1]}
	local verb comps
	
	if [[ "${1}" == "targets" ]]; then comps=$( s_bashcompletion_list_by_type "target" );	else comps=$( s_list_services "${1}" ); fi
	COMPREPLY=( $(compgen -W '$comps' -- "$cur") )
}

s_bashcompletion_start () { s_bashcompletion "stopped"; return 0; }
s_bashcompletion_stop () { s_bashcompletion "started"; return 0; }
s_bashcompletion_restart () { s_bashcompletion "started"; return 0; }
s_bashcompletion_reload () { s_bashcompletion "started"; return 0; }
s_bashcompletion_enable () { s_bashcompletion "disabled"; return 0; }
s_bashcompletion_disable () { s_bashcompletion "enabled"; return 0; }
s_bashcompletion_status () { s_bashcompletion ""; return 0; }
s_bashcompletion_wants () { s_bashcompletion "targets"; return 0; }
s_bashcompletion_log () { s_bashcompletion ""; return 0; }

complete -F s_bashcompletion_start s.start
complete -F s_bashcompletion_stop s.stop
complete -F s_bashcompletion_restart s.restart
complete -F s_bashcompletion_reload s.reload
complete -F s_bashcompletion_enable s.enable
complete -F s_bashcompletion_disable s.disable
complete -F s_bashcompletion_status s.status
complete -F s_bashcompletion_wants s.wants
complete -F s_bashcompletion_log s.log#