Shared access to Mac OS X: how to manage wakeonlan and sleep

[Raphael Straub]

Jean-Michel Pouré wrote:
> * How can I manage sleep so that it is triggered after an SSH
> disconnection and let's say 30 minutes of inactivity.
>
> * When using screen, I would like to be sure that the Mac does not  
> go to
> sleep.

I had the same problem. My solution is to turn off idle sleep and use  
the following sleep script:


#!/bin/bash

#how many checks are necessary to shutdown
checks=$1

#time between checks (see man sleep)
time=$2

### main loop
count=0
while :
do
        if [ `who | wc -l` -eq 0 ]; then
                count=`expr $count + 1`
        else
                count=0;
        fi
        if [ $count -eq $checks ]; then
                count=0;
                pmset sleepnow
        fi
        sleep $time
done


I start this script by the following launchd plist in /Library/ 
LaunchDaemons:


<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd 
">
<plist version="1.0">
<dict>
	<key>GroupName</key>
	<string>nobody</string>
	<key>Label</key>
	<string>de.uni-karlsruhe.ibds.auto_sleep</string>
	<key>OnDemand</key>
	<false/>
	<key>ProgramArguments</key>
	<array>
		<string>/usr/local/sbin/auto_sleep.sh</string>
		<string>12</string>
		<string>300</string>
	</array>
	<key>RunAtLoad</key>
	<true/>
	<key>UserName</key>
	<string>root</string>
</dict>
</plist>


As you can see, the script checks every 300 seconds if somebody is  
logged in and if this test fails 12 times in succession, the computer  
is put to sleep.

Regards,
	Raphael

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