#! /bin/sh
### /usr/local/sbin/stoppark: stop Mac10.6.8 Samsung 2T head parks (hdapm fails)

### setup
prog=$0
logfile=/Users/$USER/Library/Logs/StopPark.log
mypid=$$
ps auxwww | grep "$prog" | grep "/bin/sh" | grep -v grep | awk '{print $2}' > $logfile
pids=`cat $logfile`

### at most one copy
running=""
for pid in $pids; do
  if [ "$pid" != "$mypid" ]; then running="$running $pid"; fi
done
if [ "$running" != "" ]; then
  logger "$prog: ### already running (pid=${running})"
  rm -f $logfile
  exit 0
fi

### stop head park by write tiny file every 7 sec (attempts park every 8 sec)
logger "$prog: running (pid=$mypid)"
i=0
while [ 1 ]; do
  echo $i > $logfile
  sleep 7
  i=`expr $i + 1`
done

### HOWTO install auto-start for user "myuser"
#vi ~/Library/LaunchAgents/org.myuser.stoppark.plist
#------------------------------------------------------------
#<?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>Label</key>
#    <string>org.myuser.stoppark</string>
#    <key>ProgramArguments</key>
#    <array>
#      <string>/usr/local/sbin/stoppark</string>
#    </array>
#    <key>KeepAlive</key>
#    <true/>
#    <key>StandardOutPath</key>
#    <string>/Users/myuser/Library/Logs/StopPark.log</string>
#    <key>StandardErrorPath</key>
#    <string>/Users/myuser/Library/Logs/StopPark.log</string>
#  </dict>
#</plist>
#
#------------------------------------------------------------
### HOWTO interactively start
#launchctl load ~/Library/LaunchAgents/org.myuser.stoppark.plist