Pipe Backend Shell Script for Dovecot Antispam Plugin

#!/bin/sh

# Echo-out the command that will be executed.
#echo /usr/bin/sa-learn -D $* /tmp/sendmail-msg-$$.txt

# Add "starting now" string to log.
echo "$$-start ($*)" >> /tmp/sa-learn-pipe.log

# Copy the message contents to a temporary text file.
#echo $* > /tmp/sendmail-parms.txt
cat<&0 >> /tmp/sendmail-msg-$$.txt

CURRENT_USER=$(whoami)

echo "Calling (as user $CURRENT_USER) '/usr/bin/sa-learn $* /tmp/sendmail-msg-$$.txt'" >> /tmp/sa-learn-pipe.log

# Execute sa-learn, with the passed ham/spam argument, and the temporary message contents.
# Send the output to the log file while redirecting stderr to stdout (so we capture debug output).
/usr/bin/sa-learn $* /tmp/sendmail-msg-$$.txt >> /tmp/sa-learn-pipe.log 2>&1

# Remove the temporary message.
rm -f /tmp/sendmail-msg-$$.txt

# Add "ending now" string to log.
echo "$$-end" >> /tmp/sa-learn-pipe.log

# Exit with "success" status code.
exit 0