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#!/bin/bash
function get_unit_file(){
local UNIT=$1
for DIR in ${UNIT_PATHS[@]} ; do
if [ -f "${DIR}${UNIT}" ] ; then
echo "${DIR}${UNIT}"
break
fi
done
}
function read_option(){
local OPTION="$1"
local UNIT_FILE="$2"
local UNIT_INSTANCE="$3"
local UNIT=`basename $UNIT_FILE`
local UNIT_FULL=`echo $UNIT | sed "s/@/@$UNIT_INSTANCE/"`
VALUE="$(grep '^'$OPTION'[= ]' "$UNIT_FILE" | cut -d '=' -f2- | sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//')"
VALUE="`
echo $VALUE |
sed -e "s/%[i]/$UNIT_INSTANCE/g" \
-e "s/%[I]/\"$UNIT_INSTANCE\"/g" \
-e "s/%[n]/$UNIT_FULL/g" \
-e "s/%[N]/\"$UNIT_FULL\"/g"
`"
# TODO: Add more options from:
# https://www.freedesktop.org/software/systemd/man/systemd.unit.html#Specifiers
echo $VALUE
}
function get_unit_wants() {
local UNIT_FILE=$1
local UNIT=`basename $UNIT_FILE`
sort -u <<< `(
# Print wants from UNIT_PATHS
for DIR in ${UNIT_PATHS[@]} ; do
if [ -d "${DIR}${UNIT}.wants" ] ; then
ls -1 "${DIR}${UNIT}.wants/" | tr '\n' ' '
fi
done
# Print wants from unit-file
read_option Wants $UNIT_FILE
)`
}
function action_start(){
# Find depended services
local UNIT_FILE=$1
local UNIT_WANTS=(`get_unit_wants $1`)
local UNIT_INSTANCE=$2
# Start depended services
for UNIT in ${UNIT_WANTS[@]}; do
exec_action start $UNIT
done
# Load options
local User=`read_option User $UNIT_FILE $UNIT_INSTANCE`
local Type=`read_option Type $UNIT_FILE $UNIT_INSTANCE`
local EnvironmentFile=`read_option EnvironmentFile $UNIT_FILE $UNIT_INSTANCE`
local ExecStartPre=(`read_option ExecStartPre $UNIT_FILE $UNIT_INSTANCE`)
local ExecStart=`read_option ExecStart $UNIT_FILE $UNIT_INSTANCE`
local ExecStartPost=(`read_option ExecStartPost $UNIT_FILE $UNIT_INSTANCE`)
local Restart=(`read_option Restart $UNIT_FILE $UNIT_INSTANCE`)
local RestartSec=(`read_option RestartSec $UNIT_FILE $UNIT_INSTANCE`)
RestartSec=${RestartSec:=5}
[ -f "$EnvironmentFile" ] && source "$EnvironmentFile"
# Start service
if [ -z $Type ] || [[ "${Type,,}" == *"simple"* ]] ; then
if [ "$Restart" == "always" ]; then
COMMAND='nohup bash -c "while true ; do '"$ExecStart"'; sleep $RestartSec; done" &>/dev/null &'
else
COMMAND='nohup '"$ExecStart"' >>/dev/null 2>&1 &'
fi
elif [[ "${Type,,}" == *"forking"* ]] || [[ "${Type,,}" == *"oneshot"* ]] ; then
COMMAND="$ExecStart"
else
>&2 echo "Unknown service type $Type"
fi
#[ -z $User ] || COMMAND="su $User -c \"$COMMAND\""
while IFS=$'\n' read -a i; do
eval $i
done <<< "${ExecStartPre[@]}"
eval "$COMMAND"
while IFS=$'\n' read -a i; do
eval $i
done <<< "${ExecStartPost[@]}"
}
function action_stop(){
# Find depended services
local UNIT_FILE=$1
local UNIT_WANTS=(`get_unit_wants $1`)
local UNIT_INSTANCE=$2
# Load options
local User=`read_option User $UNIT_FILE $UNIT_INSTANCE`
local Type=`read_option Type $UNIT_FILE $UNIT_INSTANCE`
local EnvironmentFile=`read_option EnvironmentFile $UNIT_FILE $UNIT_INSTANCE`
local ExecStopPre=(`read_option ExecStartPre $UNIT_FILE $UNIT_INSTANCE`)
local ExecStop=`read_option ExecStop $UNIT_FILE $UNIT_INSTANCE`
local ExecStopPost=(`read_option ExecStartPost $UNIT_FILE $UNIT_INSTANCE`)
local ExecStart=`read_option ExecStart $UNIT_FILE $UNIT_INSTANCE`
[ -f "$EnvironmentFile" ] && source "$EnvironmentFile"
# Stop service
if [ -z $ExecStop ] ; then
COMMAND="kill -TERM \$(pgrep -f \"$ExecStart\")"
else
COMMAND="$ExecStop"
fi
#[ -z $User ] || COMMAND="su $User -c \"$COMMAND\""
while IFS=$'\n' read -a i; do
eval $i
done <<< "${ExecStopPre[@]}"
eval "$COMMAND"
while IFS=$'\n' read -a i; do
eval $i
done <<< "${ExecStopPost[@]}"
}
function action_restart(){
local UNIT_FILE=$1
local UNIT_INSTANCE=$2
action_stop $UNIT_FILE $UNIT_INSTANCE
action_start $UNIT_FILE $UNIT_INSTANCE
}
function action_enable(){
local UNIT_FILE=$1
local UNIT=`basename $UNIT_FILE`
local UNIT_INSTANCE=$2
local UNIT_FULL=`echo $UNIT | sed "s/@/@$UNIT_INSTANCE/"`
local WantedBy=`read_option WantedBy $UNIT_FILE`
if [ -z $WantedBy ] ; then
>&2 echo "Unit $UNIT have no WantedBy option."
exit 1
fi
local WANTEDBY_DIR="/etc/systemd/system/$WantedBy.wants"
if [ ! -f "$WANTEDBY_DIR/$UNIT_FULL" ] ; then
mkdir -p $WANTEDBY_DIR
echo Created symlink from $WANTEDBY_DIR/$UNIT_FULL to $UNIT_FILE.
ln -s $WANTEDBY_DIR/$UNIT_FULL $UNIT_FILE
fi
}
function action_disable(){
local UNIT_FILE=$1
local UNIT=`basename $UNIT_FILE`
local UNIT_INSTANCE=$2
local UNIT_FULL=`echo $UNIT | sed "s/@/@$UNIT_INSTANCE/"`
local WantedBy=`read_option WantedBy $UNIT_FILE`
if [ -z $WantedBy ] ; then
>&2 echo "Unit $UNIT have no WantedBy option."
exit 1
fi
local WANTEDBY_DIR="/etc/systemd/system/$WantedBy.wants"
if [ -f "$WANTEDBY_DIR/$UNIT_FULL" ] ; then
echo Removed $WANTEDBY_DIR/$UNIT_FULL.
rm -f $WANTEDBY_DIR/$UNIT_FULL.
rmdir --ignore-fail-on-non-empty $WANTEDBY_DIR
fi
}
function action_status(){
# Find depended services
local UNIT_FILE=$1
local UNIT_WANTS=(`get_unit_wants $1`)
local UNIT_INSTANCE=$2
local ExecStart=`read_option ExecStart $UNIT_FILE $UNIT_INSTANCE`
COMMAND="pgrep -f \"$ExecStart\" &>/dev/null"
if eval "$COMMAND"; then
exit 0
fi
>&2 echo "Loaded: not-found"
exit 1
}
function action_is_enabled(){
exit 0
}
function action_is_active(){
local UNIT=`basename $1`
if systemctl status $UNIT ; then
>&2 echo "active"
exit 0
fi
exit 1
}
function exec_action(){
local ACTION=$1
local UNIT=$2
[[ $UNIT =~ '.' ]] || UNIT="$UNIT.service"
if [[ $UNIT =~ '@' ]] ; then
local UNIT_INSTANCE=`echo $UNIT | cut -d'@' -f2- | cut -d. -f1`
local UNIT=`echo $UNIT | sed "s/$UNIT_INSTANCE//"`
fi
UNIT_FILE=`get_unit_file $UNIT`
if [ -z $UNIT_FILE ] ; then
>&2 echo "Failed to $ACTION $UNIT: Unit $UNIT not found."
exit 1
else
case "$ACTION" in
start ) action_start $UNIT_FILE $UNIT_INSTANCE ;;
stop ) action_stop $UNIT_FILE $UNIT_INSTANCE ;;
restart ) action_restart $UNIT_FILE $UNIT_INSTANCE ;;
enable ) action_enable $UNIT_FILE $UNIT_INSTANCE ;;
disable ) action_disable $UNIT_FILE $UNIT_INSTANCE ;;
status ) action_status $UNIT_FILE $UNIT_INSTANCE ;;
is-enabled ) action_is_enabled $UNIT_FILE $UNIT_INSTANCE ;;
is-active ) action_is_active $UNIT_FILE $UNIT_INSTANCE ;;
* ) >&2 echo "Unknown operation $ACTION." ; exit 1 ;;
esac
fi
}
ACTION="$1"
UNITS="${@:2}"
UNIT_PATHS=(
/etc/systemd/system/
/usr/lib/systemd/system/
)
for UNIT in ${UNITS[@]}; do
exec_action $ACTION $UNIT
done
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