Advice on converting SysVinit file to Systemd services will be helpful.
Currently, I am using a systemv init script which will be executed after every boot on my STM32MP1 based Avenger96 board. Now I have to switch to Systemd from SysVinit. But I am not sure how to convert the init file to relevant systemd files. I am using Yocto with Ubuntu20.04 as build system. If someone help me to get started would be really great. Below is the init script and image recipe which establishes symlink to the init script.
custom-script.sh which is installed in etc/init.d/ directory of the rootfs.
#!/bin/sh
DAEMON="swupdate"
PIDFILE="/var/run/$DAEMON.pid"
PART_STATUS=$(sgdisk -A 4:get:2 /dev/mmcblk0)
if test "${PART_STATUS}" = "4:2:1" ; then
ROOTFS=rootfs-2
else
ROOTFS=rootfs-1
fi
if test -f /update-ok ; then
SURICATTA_ARGS="-c 2"
rm -f /update-ok
fi
start() {
printf 'Starting %s: ' "$DAEMON"
# shellcheck disable=SC2086 # we need the word splitting
start-stop-daemon -b -q -m -S -p "$PIDFILE" -x "/usr/bin/$DAEMON" \
-- -f /etc/swupdate/swupdate.cfg -L -e rootfs,${ROOTFS} -u "${SURICATTA_ARGS}"
status=$?
if [ "$status" -eq 0 ]; then
echo "OK"
else
echo "FAIL"
fi
return "$status"
}
stop() {
printf 'Stopping %s: ' "$DAEMON"
start-stop-daemon -K -q -p "$PIDFILE"
status=$?
if [ "$status" -eq 0 ]; then
rm -f "$PIDFILE"
echo "OK"
else
echo "FAIL"
fi
return "$status"
}
restart() {
stop
sleep 1
start
}
case "$1" in
start|stop|restart)
"$1";;
reload)
# Restart, since there is no true "reload" feature.
restart;;
*)
echo "Usage: $0 {start|stop|restart|reload}"
exit 1
esac
Image recipe which creates init.d dir and installs above script and also establishes symlink to rc4.d dir.
custom-image.bb
.
.
inherit update-rc.d
SRC_URI = "file://custom-script.sh \
"
S = "${WORKDIR}"
INITSCRIPT_PACKAGES = "${PN}"
INITSCRIPT_NAME = "custom-script.sh"
INITSCRIPT_PARAMS = "start 99 2 3 4 5 . "
do_install_append() {
install -d ${D}${sysconfdir}/rc4.d
install -d 644 ${D}${sysconfdir}/init.d
install -m 0755 ${WORKDIR}/custom-script.sh ${D}${sysconfdir}/init.d
ln -sf ../init.d/custom-script.sh ${D}${sysconfdir}/rc4.d/S99custom-script.sh
ln -sf ../init.d/custom-script.sh ${D}${sysconfdir}/rc4.d/K99custom-script.sh
}
FILES_${PN} += "${sysconfdir}/init.d"
Now I am trying to do the same functionality of custom-script.sh with systemd. Is it possible to make use of systemd-sysv-generator in this case?
Also, will the dir init.d completely removed once we switch to "systemd"? What will happen to other files which are present in etc/init.d?
Can anyone please help me get started?
Your help will be much appreciated.
Thanks in advance.
P.S: Please let me know if any info is missing here.
/etc/init.d will not get deleted by using systemd
Have you checked /etc/systemd and /usr/lib/systemd on your Ubuntu machine for examples of systemd scripts. Along the manual pages of systemd, you should have enough examples to convert your sysv init script to systemd.
Related
I am using a docker to watch and sync data in a folder with inotify and aws-cli but when I try to kill the docker with SIGTERM it exit with code 143 but I want to get a zero exit code. And if i kill the inotify process inside the docker it do return a zero code.
So how can I kill the entrypoint.sh with TERM signal and return a 0 code?
The docker is here. I put the bash script below:
#!/usr/bin/env bash
# S3Sync Entry Point
# Bash strict mode
set -euo pipefail
IFS=$'\n\t'
# VARs
S3PATH=${S3PATH:-}
SYNCDIR="${SYNCDIR:-/sync}"
CRON_TIME="${CRON_TIME:-10 * * * *}"
INITIAL_DOWNLOAD="${INITIAL_DOWNLOAD:-true}"
# Log message
log(){
echo "[$(date "+%Y-%m-%dT%H:%M:%S%z") - $(hostname)] ${*}"
}
# Sync files
sync_files(){
local src="${1:-}"
local dst="${2:-}"
mkdir -p "$dst" # Make sure directory exists
log "Sync '${src}' to '${dst}'"
if ! aws s3 sync --no-progress --delete --exact-timestamps "$src" "$dst"; then
log "Could not sync '${src}' to '${dst}'" >&2; exit 1
fi
}
# Download files
download_files(){
sync_files "$S3PATH" "$SYNCDIR"
}
# Upload files
upload_files(){
sync_files "$SYNCDIR" "$S3PATH"
}
# Run initial download
initial_download(){
if [[ "$INITIAL_DOWNLOAD" == 'true' ]]; then
if [[ -d "$SYNCDIR" ]]; then
# directory exists
if [[ $(ls -A "$SYNCDIR" 2>/dev/null) ]]; then
# directory is not empty
log "${SYNCDIR} is not empty; skipping initial download"
else
# directory is empty
download_files
fi
else
# directory does not exist
download_files
fi
elif [[ "$INITIAL_DOWNLOAD" == 'force' ]]; then
download_files
fi
}
# Watch directory using inotify
watch_directory(){
initial_download # Run initial download
log "Watching directory '${SYNCDIR}' for changes"
inotifywait \
--event create \
--event delete \
--event modify \
--event move \
--format "%e %w%f" \
--monitor \
--quiet \
--recursive \
"$SYNCDIR" |
while read -r changed
do
log "$changed"
upload_files
done
}
# Install cron job
run_cron(){
local action="${1:-upload}"
# Run initial download
initial_download
log "Setup the cron job (${CRON_TIME})"
echo "${CRON_TIME} /entrypoint.sh ${action}" > /etc/crontabs/root
exec crond -f -l 6
}
# Main function
main(){
if [[ ! "$S3PATH" =~ s3:// ]]; then
log 'No S3PATH specified' >&2; exit 1
fi
mkdir -p "$SYNCDIR" # Make sure directory exists
# Parse command line arguments
cmd="${1:-download}"
case "$cmd" in
download)
download_files
;;
upload)
upload_files
;;
sync)
watch_directory
;;
periodic_upload)
run_cron upload
;;
periodic_download)
run_cron download
;;
*)
log "Unknown command: ${cmd}"; exit 1
;;
esac
}
main "$#"
Trying trap like this but failed:
trap "exit" INT TERM
trap "kill 0" EXIT
Answered by the contributor of the docker image.
https://github.com/vladgh/docker_base_images/issues/62
This image uses Tini, which does not make any assumptions about the meaning of the signal it receives and simply forwards it to its child.
In order for your traps to work you need to add the -g flag to Tini in the Dockerfile (krallin/tini#process-group-killing):
ENTRYPOINT ["/sbin/tini", "-g", "--", "/entrypoint.sh"]
An only then you can set a trap at the top of the entrypoint.sh:
trap "exit 0" INT TERM EXIT
I'd like to use notify-send from within a bash script that is running in the background to inform the user about the progress of the script. More specifically this is a script that automagically runs when a USB flash drive is inserted and runs a scan with ClamAV.
Specifically at line 30 and line 66. So far, I'm not having any luck. Can someone give me some advice/help? Thanks.
#!/bin/bash
#doOnUSBinsert_0.2.sh
#Author : Totti
# Make it executable by running 'sudo chmod x doOnUSBinsert_0.2.sh'
if ! [ -f /etc/udev/rules.d/80-doOnUSBinsert.rules ]
then # rule not added
cp "$0" /usr/bin/doOnUSBinsert
chmod u x /usr/bin/doOnUSBinsert
# echo 'SUBSYSTEM=="usb", ACTION=="add", RUN ="/path/to/script.sh"' | sudo tee /etc/udev/rules.d/80-clamscan.rules
echo 'SUBSYSTEM=="usb", ACTION=="add", RUN ="/usr/bin/doOnUSBinsert & "' | tee /etc/udev/rules.d/80-doOnUSBinsert.rules
if [ $? -eq 0 ]
then
echo 'Rule Successfully added. See file "/usr/bin/doOnUSBinsert" if you wish to edit the command'
exit 0
else
echo 'ERROR while adding rule'
exit 1
fi
fi
lfile="/tmp/doOnUSBinsert.log" # udev
lfile2="/tmp/clamscanFromUdev.log" # clamscan
lfile3="/tmp/doOnUSBinsert_mount.log" # mount
notify-send "USB SCAN ON INSERT" "Currently scanning with ClamAV"
main ()
{
sleep 12 # let the partitions to mount
#cat /proc/$$/environ | tr '�' 'n' >> /tmp/udevEnvirn.txt
echo "found $ID_SERIAL" >> "$lfile"
cat /etc/mtab | grep "^$part_c" >> "$lfile.3"
if [ "$ID_SERIAL"x = 'x' ]
then
echo "Exiting on empty ID_SERIAL" >> "$lfile"
exit 1
fi
#Eg: ID_SERIAL --> /dev/disk/by-id/usb-sandisk....42343254343543
#i=0
echo 'searching partitions' >> "$lfile"
for partitionPath in $( find /dev/disk/by-id/ -name "*$ID_SERIAL*part*" )
do
echo "current partition = $partitionPath" >> "$lfile"
# part[i ]="$( readlink -f "$partition" )" # Eg Output: /dev/sdb1 , /dev/sdb2
part_c="$( readlink -f $partitionPath )"
mpoint="$( cat /etc/mtab | grep "^$part_c" | awk '{print $2}' )"
echo "partitionPath= $partitionPath, part = $part_c, mountpoint= $mpoint" >> "$lfile"
echo "Scaning --> $mpoint" >> "$lfile.2"
############################################
clamscan -r --bell "$mpoint"/* >> "$lfile.2"
#############################################
done
}
notify-send "USB SCAN ON INSERT" "Finished scanning with ClamAV"
main &
echo ______________________________________ >> "$lfile"
exit 0
I'm pretty new to the linux world, but while looking for a solution for a similar project I found THIS
Tip: An overview on the available icons can be found here. To send
desktop notification from a background script running as root (replace
X_user and X_userid with the user and userid running X respectively):
sudo -u X_user DISPLAY=:0 DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/X_userid/bus notify-send 'Hello world!' 'This is an example notification.'
Hope this will help others.
Depending on how you are running the script it may not have access to the display variable. Try running export DISPLAY=:0.0 prior to the command.
If you are running the script as a different user, ie root, then you may also need to run it as su - <logged in user> -c notify-send ... (I usually don't need to do this, but I remember having to at one point - but I cant recall which distro or version I was on at the time.)
I'm working on a script to automate the creation of a .gitconfig file.
This is my main script that calls a function which in turn execute another file.
dotfile.sh
COMMAND_NAME=$1
shift
ARG_NAME=$#
set +a
fail() {
echo "";
printf "\r[${RED}FAIL${RESET}] $1\n";
echo "";
exit 1;
}
set -a
sub_setup() {
info "This may overwrite existing files in your computer. Are you sure? (y/n)";
read -p "" -n 1;
echo "";
if [[ $REPLY =~ ^[Yy]$ ]]; then
for ARG in $ARG_NAME; do
local SCRIPT="~/dotfiles/setup/${ARG}.sh";
[ -f "$SCRIPT" ] && echo "Applying '$ARG'" && . "$SCRIPT" || fail "Unable to find script '$ARG'";
done;
fi;
}
case $COMMAND_NAME in
"" | "-h" | "--help")
sub_help;
;;
*)
CMD=${COMMAND_NAME/*-/}
sub_${CMD} $ARG_NAME 2> /dev/null;
if [ $? = 127 ]; then
fail "'$CMD' is not a known command or has errors.";
fi;
;;
esac;
git.sh
git_config() {
if [ ! -f "~/dotfiles/git/gitconfig_template" ]; then
fail "No gitconfig_template file found in ~/dotfiles/git/";
elif [ -f "~/dotfiles/.gitconfig" ]; then
fail ".gitconfig already exists. Delete the file and retry.";
else
echo "Setting up .gitconfig";
GIT_CREDENTIAL="cache"
[ "$(uname -s)" == "Darwin" ] && GIT_CREDENTIAL="osxkeychain";
user " - What is your GitHub author name?";
read -e GIT_AUTHORNAME;
user " - What is your GitHub author email?";
read -e GIT_AUTHOREMAIL;
user " - What is your GitHub username?";
read -e GIT_USERNAME;
if sed -e "s/AUTHORNAME/$GIT_AUTHORNAME/g" \
-e "s/AUTHOREMAIL/$GIT_AUTHOREMAIL/g" \
-e "s/USERNAME/$GIT_USERNAME/g" \
-e "s/GIT_CREDENTIAL_HELPER/$GIT_CREDENTIAL/g" \
"~/dotfiles/git/gitconfig_template" > "~/dotfiles/.gitconfig"; then
success ".gitconfig has been setup";
else
fail ".gitconfig has not been setup";
fi;
fi;
}
git_config
In the console
$ ./dotfile.sh --setup git
[ ?? ] This may overwrite existing files in your computer. Are you sure? (y/n)
y
Applying 'git'
Setting up .gitconfig
[ .. ] - What is your GitHub author name?
Then I cannot see what I'm typing...
At the bottom of dotfile.sh, I redirect any error that occurs during my function call to /dev/null. But I should normally see what I'm typing. If I remove 2> /dev/null from this line sub_${CMD} $ARG_NAME 2> /dev/null;, it works!! But I don't understand why.
I need this line to prevent my script to echo an error in case my command doesn't exists. I only want my own message.
e.g.
$ ./dotfile --blahblah
./dotfiles: line 153: sub_blahblah: command not found
[FAIL] 'blahblah' is not a known command or has errors
I really don't understand why the input in my sub script is redirected to /dev/null as I mentioned only stderr to be redirected to /dev/null.
Thanks
Do you need the -e option in your read statements?
I did a quick test in an interactive shell. The following command does not echo characters :
read -e TEST 2>/dev/null
The following does echo the characters
read TEST 2>/dev/null
i was written bash script which will start slave.jar process and vm will appear in jenkins. I have to start this script as service when linux boot up. I place my file in etc/init.d, with chmod +x and after that make chckconfig on it and all links are appears in rc.d folders, output of chkconfig shows:
jenkins-slave 0:off 1:off 2:on 3:on 4:on 5:on 6:off
When i make reboot nothing happend, when i run via sudo service jenkins-slave start everything is ok. All propertis contains in another file, everything is working when make it by hands in open session. How to make it auto executable when CentOs 6 up?
my script:
#!/bin/sh
#
# jenkins-slave: Launch a Jenkins BuildSlave instance on this node
#
# chkconfig: - 99 01
# description: Enable this node to fulfill build jobs
#
# Source function library.
. /etc/rc.d/init.d/functions
[ -f /etc/sysconfig/jenkins-slave ] && . /etc/sysconfig/jenkins-slave
[ -n "$JENKINS_URL" ] || exit 0
[ -n "$JENKINS_WORKDIR" ] || exit 0
[ -n "$JENKINS_USER" ] || exit 0
[ -n "$JENKINS_NODENAME" ] || exit 0
[ -x /usr/bin/java ] || exit 0
download_jar()
{
curl -s -o slave.jar $JENKINS_URL/jnlpJars/slave.jar || exit 0
}
start()
{
cd $JENKINS_WORKDIR
[ -f slave.jar ] || download_jar
echo -n $"Starting Jenkins BuildSlave: "
su - $JENKINS_USER sh -c "\
java -jar slave.jar \
-jnlpUrl $JENKINS_URL/computer/$JENKINS_NODENAME/slave-agent.jnlp \
>slave.log 2>&1 &"
echo Done.
}
stop()
{
echo -n $"Shutting down Jenkins BuildSlave: "
killproc slave.jar
echo Done.
}
# See how we were called.
case "$1" in
start)
start
;;
stop)
stop
;;
restart|reload)
stop
start
;;
status)
status java
;;
*)
echo $"Usage: $0 {start|stop|restart|reload}"
exit 1
esac
exit 0
I need to launch a Java application on Centos (5.9) startup.
I am trying to start a simple script (named "lanzar.sh") on Centos at boot time:
#!/bin/sh
cd /home/someuser/Desktop/Dist
java -jar SomeApp.jar
I append the line "/bin/sh /home/someuser/Desktop/Dist/lanzar.sh" to /etc/rc.d/rc.local. But the java application does not start. I have:
Granted 755 rights to the /etc/rc.d/rc.local file
Write the content of the "lanzar.sh" into /etc/rc.d/rc.local. Separated with semicolon, and in different lines.
Changing "lanzar.sh" of location.
Other things, taken from other threads that did not work for me.
My rc.loca looks like:
#!/bin/sh
#
# This script will be executed *after* all the other init scripts.
# You can put your own initialization stuff in here if you don't
# want to do the full Sys V style init stuff.
#
#Some comment
#Some comment
#Some comment
touch /var/lock/subsys/local
/bin/sh /home/fernando/Desktop/Dist/lanzar.sh
Note: I know similar questions have been asked before, but after testing many of the answers that I have found by googling with no success, I had to ask this myself.
I highly recommend that you explore the /etc/init.d directory of your server and the /etc/rc3.d directory. See how the names of the files in /etc/rc3.d are symbolically linked to the names in the /etc/init.d directory. Notice how the files in /etc/rc3.d all start with Sxx or Kxxwherexx is a number between 00 to 99.
What I am about to tell you is officially all wrong. These startup scripts are way more complicated today that what I describe, but it's a basic outline of what's going on.
In standard Unix and Linux, startup scripts were normally stored in /etc/init.d and then linked to the /etc/rcX.d directory where X stood for what was called the Init States of the server. (Yes, I'm linking to an SCO Unix page, but they were all pretty similar).
Note that Init State 3 is running in multi-user mode and that all the daemons are started. This is why I am telling you to look in /etc/rc3.d.
When the server enters that init state, it runs all of the script starting with S in alphabetical order. It runs each script with the parameter start after it. So, S01xxxx starts before S03xxx which starts before S99xxxxx.
When the server exits that init state, it runs all of the scripts that start with K in alphabetical order, and passes the stop parameter to them.
Now, Centos, Redhat, and Fedora setup handles a lot of this for you. You specify which service you depend upon, and it figures out startup and shutdown order. However, nothing is preventing you from munging a startup script and creating your own links.
By the way, speaking about Java programs that startup and shutdown... Jenkins is a Java program that's started in a very similar way as your program. Here's the /etc/init.d script I got off of Jenkins website:
#!/bin/bash
#
# Startup script for Jenkins
#
# chkconfig: - 84 16
# description: Jenkins CI server
# Source function library.
. /etc/rc.d/init.d/functions
[ -z "$JAVA_HOME" -a -x /etc/profile.d/java.sh ] && . /etc/profile.d/java.sh
JENKINS_HOME=/var/jenkins
WAR="$JENKINS_HOME/jenkins.war"
LOG="/var/log/jenkins.log"
LOCK="/var/lock/subsys/jenkins"
export JENKINS_HOME
RETVAL=0
pid_of_jenkins() {
pgrep -f "java.*jenkins"
}
start() {
[ -e "$LOG" ] && cnt=`wc -l "$LOG" | awk '{ print $1 }'` || cnt=1
echo -n $"Starting jenkins: "
cd "$JENKINS_HOME"
nohup java -jar "$WAR" --httpPort=-1 --ajp13Port=8010 --prefix=/jenkins >> "$LOG" 2>&1 &
while { pid_of_jenkins > /dev/null ; } &&
! { tail +$cnt "$LOG" | grep -q 'Winstone Servlet Engine .* running' ; } ; do
sleep 1
done
pid_of_jenkins > /dev/null
RETVAL=$?
[ $RETVAL = 0 ] && success $"$STRING" || failure $"$STRING"
echo
[ $RETVAL = 0 ] && touch "$LOCK"
}
stop() {
echo -n "Stopping jenkins: "
pid=`pid_of_jenkins`
[ -n "$pid" ] && kill $pid
RETVAL=$?
cnt=10
while [ $RETVAL = 0 -a $cnt -gt 0 ] &&
{ pid_of_jenkins > /dev/null ; } ; do
sleep 1
((cnt--))
done
[ $RETVAL = 0 ] && rm -f "$LOCK"
[ $RETVAL = 0 ] && success $"$STRING" || failure $"$STRING"
echo
}
status() {
pid=`pid_of_jenkins`
if [ -n "$pid" ]; then
echo "jenkins (pid $pid) is running..."
return 0
fi
if [ -f "$LOCK" ]; then
echo $"${base} dead but subsys locked"
return 2
fi
echo "jenkins is stopped"
return 3
}
# See how we were called.
case "$1" in
start)
start
;;
stop)
stop
;;
status)
status
;;
restart)
stop
start
;;
*)
echo $"Usage: $0 {start|stop|restart|status}"
exit 1
esac
exit $RETVAL
It'll give you something to work with.