What if I create a LaunchDaemon that triggers on changes to /etc/cups/printers.conf and that LaunchDaemon then runs a script that fixes the faulty settings in printers.conf?
Said and done, here are the result (sorry for the formatting, blame blogger):
The LaunchDaemon (located in /Library/LaunchDaemons)
<?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>se.lnu.cupsfix</string>
<key>ProgramArguments</key>
<array>
<string>/Library/Scripts/cupsfix.sh</string>
</array>
<key>WatchPaths</key>
<array>
<string>/private/etc/cups/printers.conf</string>
</array>
</dict>
</plist>
The script (/Library/Scripts/cupsfix.sh)
#!/bin/bash
# cupsfix.sh by Marcus Jaensson
# Must be run as root
### VARIABLES
PRINTERLIST=`lpstat -p | awk '{print $2}'`
LOGF="/var/log/lnu_cupsfix.log"
### FUNCTIONS
function log()
{
echo -e "[`date "+%y%m%d %H.%M.%S"`]\t$1"
echo -e "[`date "+%y%m%d %H.%M.%S"`]\t$1" >> $LOGF
}
### SCRIPT
for printer in $PRINTERLIST; do
if [[ -z `lpoptions -p $printer | grep "auth-info-required=username,password"` ]]; then
log "Printer $printer has faulty settings, will now correct this"
lpadmin -p "$printer" -o auth-info-required=username,password
else
log "Printer $printer has the correct settings, have nothing to do"
fi
done
exit 0
Provided "as is"...
