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I am a novice of sysvinit, but I like its simplicity. However, I don’t understand the script creation syntax of sysvinit, so I started searching github. Finally, I found a tool that can semi-automatically create service scripts. I copied it and performed the following operations:
1. I created a /etc/inittools directory, which contained the tool create, a template file, and a Readme file for creating service scripts
The content of create is as follows:
#!/bin/bash
SERVICE_FILE=$(tempfile)
if [ ! -e service.sh ]; then
echo "--- Download template ---"
echo "I'll now download the service.sh, because is is not downloaded."
echo "..."
wget -q https://raw.githubusercontent.com/wyhasany/sample-service-script/master/service.sh
if [ "$?" != 0 ]; then
echo "I could not download the template!"
echo "You should now download the service.sh file manualy. Run therefore:"
echo "wget https://raw.githubusercontent.com/wyhasany/sample-service-script/master/service.sh"
exit 1
else
echo "I donloaded the tmplate sucessfully"
echo ""
fi
fi
echo "--- Copy template ---"
cp service.sh "$SERVICE_FILE"
chmod +x "$SERVICE_FILE"
echo ""
echo "--- Customize ---"
echo "I'll now ask you some information to customize script"
echo "Press Ctrl+C anytime to abort."
echo "Empty values are not accepted."
echo ""
prompt_token() {
local VAL=""
if [ "$3" = "" ]; then
while [ "$VAL" = "" ]; do
echo -n "${2:-$1} : "
read VAL
if [ "$VAL" = "" ]; then
echo "Please provide a value"
fi
done
else
VAL=${@:3:($#-2)}
fi
VAL=$(printf '%s' "$VAL")
eval $1=$VAL
local rstr=$(printf '%q' "$VAL")
rstr=$(echo $rstr | sed -e 's/[\/&]/\\&/g') # escape search string for sed http://stackoverflow.com/questions/407523/escape-a-string-for-a-sed-replace-pattern
sed -i "s/<$1>/$rstr/g" $SERVICE_FILE
}
prompt_token 'NAME' 'Service name' $1
if [ -f "/etc/init.d/$NAME" ]; then
echo "Error: service '$NAME' already exists"
exit 1
fi
prompt_token 'DESCRIPTION' ' Description' $2
prompt_token 'COMMAND' ' Command' $3
prompt_token 'USERNAME' ' User' $4
if ! id -u "$USERNAME" &> /dev/null; then
echo "Error: user '$USERNAME' not found"
exit 1
fi
echo ""
echo "--- Installation ---"
if [ ! -w /etc/init.d ]; then
echo "You didn't give me enough permissions to install service myself."
echo "That's smart, always be really cautious with third-party shell scripts!"
echo "You should now type those commands as superuser to install and run your service:"
echo ""
echo " mv \"$SERVICE_FILE\" \"/etc/init.d/$NAME\""
echo " touch \"/var/log/$NAME.log\" && chown \"$USERNAME\" \"/var/log/$NAME.log\""
echo " update-rc.d \"$NAME\" defaults"
echo " service \"$NAME\" start"
else
echo "1. mv \"$SERVICE_FILE\" \"/etc/init.d/$NAME\""
mv -v "$SERVICE_FILE" "/etc/init.d/$NAME"
echo "2. touch \"/var/log/$NAME.log\" && chown \"$USERNAME\" \"/var/log/$NAME.log\""
touch "/var/log/$NAME.log" && chown "$USERNAME" "/var/log/$NAME.log"
echo "3. update-rc.d \"$NAME\" defaults"
update-rc.d "$NAME" defaults
echo "4. service \"$NAME\" start"
service "$NAME" start
fi
echo ""
echo "---Uninstall instructions ---"
echo "The service can uninstall itself:"
echo " service \"$NAME\" uninstall"
echo "It will simply run update-rc.d -f \"$NAME\" remove && rm -f \"/etc/init.d/$NAME\""
echo ""
echo "--- Terminated ---"
The content of template is as follows:
#!/bin/sh
### BEGIN INIT INFO
# Provides: <NAME>
# Required-Start: $local_fs $network $named $time $syslog
# Required-Stop: $local_fs $network $named $time $syslog
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Description: <DESCRIPTION>
### END INIT INFO
SCRIPT="<COMMAND>"
RUNAS=<USERNAME>
PIDFILE=/var/run/<NAME>.pid
LOGFILE=/var/log/<NAME>.log
start() {
if [ -f $PIDFILE ] && [ -s $PIDFILE ] && kill -0 $(cat $PIDFILE); then
echo 'Service already running' >&2
return 1
fi
echo 'Starting service…' >&2
local CMD="$SCRIPT &> \"$LOGFILE\" & echo \$!"
su -c "$CMD" $RUNAS > "$PIDFILE"
# Try with this command line instead of above if not workable
# su -s /bin/sh $RUNAS -c "$CMD" > "$PIDFILE"
sleep 2
PID=$(cat $PIDFILE)
if pgrep -u $RUNAS -f $NAME > /dev/null
then
echo "$NAME is now running, the PID is $PID"
else
echo ''
echo "Error! Could not start $NAME!"
fi
}
stop() {
if [ ! -f "$PIDFILE" ] || ! kill -0 $(cat "$PIDFILE"); then
echo 'Service not running' >&2
return 1
fi
echo 'Stopping service…' >&2
kill -15 $(cat "$PIDFILE") && rm -f "$PIDFILE"
echo 'Service stopped' >&2
}
uninstall() {
echo -n "Are you really sure you want to uninstall this service? That cannot be undone. [yes|No] "
local SURE
read SURE
if [ "$SURE" = "yes" ]; then
stop
rm -f "$PIDFILE"
echo "Notice: log file was not removed: $LOGFILE" >&2
update-rc.d -f $NAME remove
rm -fv "$0"
else
echo "Abort!"
fi
}
status() {
printf "%-50s" "Checking <NAME>..."
if [ -f $PIDFILE ] && [ -s $PIDFILE ]; then
PID=$(cat $PIDFILE)
if [ -z "$(ps axf | grep ${PID} | grep -v grep)" ]; then
printf "%s\n" "The process appears to be dead but pidfile still exists"
else
echo "Running, the PID is $PID"
fi
else
printf "%s\n" "Service not running"
fi
}
case "$1" in
start)
start
;;
stop)
stop
;;
status)
status
;;
uninstall)
uninstall
;;
restart)
stop
start
;;
*)
echo "Usage: $0 {start|stop|status|restart|uninstall}"
esac
The content of ReadMe is as follows:
**This tool directory is used to use the create tool in the directory to generate the service script in /etc/init.d/**
2. Then give it executable permissions, sudo chmod +x /etc/inittools/create
3. In this way, every time I need to create a service, I enter /etc/inittools and execute create. It is semi-automatic. Hope it helps you,Cheers
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Thank you for sharing this.
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Never mind me. I just thought I'd leave a reference to the LSB standard on init scripts for future hackers.
Linux Standard Base Core Specification 4.1 - VIII. System Initialization
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