OSX create launchd service for bash script execution

Question

I have written a bash script to continuously checks a service. The script has some functions and also calls other source bash files and works fine when executed manually. The script has a continuous loop statement something like,

while true; do
{

$path/is_it_running
if [ "$?" == "0" ]; then
{
echo "yes, it is running"
$path/test
if [ "$?" != "0" ]; then
fix_the_issues
fi
}

else 
echo "It is not running!"

fi
sleep 10
}
done

/Library/LaunchDaemons/my.own.service.plist:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
    <dict>
        <key>Label</key>
        <string>my.own.service</string>
        <key>ProgramArguments</key>
        <array>
            <string>/bin/bash</string>
            <string>/path/to/bash/script</string>
        </array>
        <key>RunAtLoad</key>
        <true/>
         <key>KeepAlive</key>
        <true/>
        <key>StandardOutPath</key>
        <string>/var/log/my-service.log</string>
    </dict>
</plist>

sudo launchctl load -w /Library/LaunchDaemons/my.own.service.plist

/var/log/system.log:

com.apple.xpc.launchd[1] (com.apple.quicklook[80608]): Endpoint has been activated through legacy launch(3) APIs. Please switch to XPC or bootstrap_check_in(): com.apple.quicklook

The issue what i'm facing: The script is not running exactly how it runs when manually executed. I can say launchd triggers the script as I could see "yes, it is running" and "It is not running!" messages from the plist StandardOutPath log file /var/log/my-service.log.

Can anyone help me here to successfully run the bash script as service?. It looks difficult for me in osx unlike debian/centos. BTW, it's osx EI Captain and Sierra editions.

Try putting a proper shebang at the start of your script #!/bin/bash and removing bash from your arguments array. Also, try indenting your shell script to make it legible and run it through shellcheck.net — Mark Setchell
– Mark Setchell, Commented Oct 17, 2016 at 19:34
The script file has #!/bin/bash at the top and in all other source file which it calls. I can remove in plist arguments. it echoes if it is running or not running perfectly, but not doing certain action when the service is running or not running. I have been testing this script file and it works exactly how I wanted. It uses sudo somewhere which prompt for password, I don't think launchd waits for this to be answered as it runs as root, do you?. — user465465
– user465465, Commented Oct 18, 2016 at 1:47

Ashutosh Jindal · Accepted Answer · 2016-10-17 20:37:28Z

3

The following works for me for a bash script on OSX 10.10:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>Disabled</key>
    <false/>
    <key>EnvironmentVariables</key>
    <dict>
        <key>PATH</key>
        <string>/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/sbin</string>
    </dict>
    <key>KeepAlive</key>
    <dict>
         <key>SuccessfulExit</key>
         <false/>
     </dict>
    <key>Label</key>
    <string>SomeNameHere</string>
    <key>ProgramArguments</key>
    <array>
        <string>/bin/bash</string>
        <string>/path/to/bash/script</string>
    </array>
    <key>RunAtLoad</key>
    <true/>
</dict>
</plist>

I used Lingon to create it. You could use the free trial for it as well to solve your current issue.

You would need to use version 4:

Requires macOS 10.11 or later (works perfectly with macOS 10.12 Sierra)

answered Oct 17, 2016 at 20:37

Ashutosh Jindal

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3 Comments

user465465 Over a year ago

Wow it works now, probably the environment variable is the key. But, launchctl list|stop|start are not working, any idea why?

Ashutosh Jindal Over a year ago

Hey mate, I'll have a look

user465465 Over a year ago

If I could start and stop the service that would have been great, still great job. This helped me a lot!.

tripleee · Accepted Answer · 2017-05-29 11:46:06Z

3

This is a stylistic fix for the bash antipatterns in your script. I would post it as a comment but comments cannot contain code formatting.

while true; do
#{  no braces necessary here
# note indentation
    # Don't examine $? -- if already does that for you
    if $path/is_it_running; then
    #{ no braces necessary here
    # note indentation
        echo "yes, it is running"
        # Don't examine $? -- if already does that for you
        if $path/test; then
            fix_the_issues
        fi

    #}  No braces necessary       
    else 
        # Note indentation
        echo "It is not running!"
    fi
    sleep 10
#} No braces necessarsy
done

You might also want to visit http://shellcheck.net/ for an automated review of your scripts. (Though it doesn't examine indentation, which is purely for human legibility.)

answered May 29, 2017 at 11:46

tripleee

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1 Comment

zzxyz Over a year ago

This came up in a review queue for deletion which I find a little bizarre. I'm considering it an XY answer. It looks like a helpful attempt to address OP problems they weren't aware of. Hardly unusual.

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