bogofilter: install postfix-bogofilter script

Signed-off-by: W. Michael Petullo <mike@flyn.org>

mail/bogofilter/Makefile

@@ -41,6 +41,7 @@ define Package/bogofilter/install
 	$(INSTALL_DIR)  $(1)/etc/ \
                         $(1)/usr/bin
 	$(INSTALL_CONF) $(PKG_BUILD_DIR)/bogofilter.cf.example $(1)/etc/bogofilter.cf
+	$(INSTALL_BIN) ./files/postfix-bogofilter $(1)/usr/sbin/postfix-bogofilter
 	$(CP) $(PKG_INSTALL_DIR)/usr/bin/bf_compact $(1)/usr/bin/
 	$(CP) $(PKG_INSTALL_DIR)/usr/bin/bf_copy $(1)/usr/bin/
 	$(CP) $(PKG_INSTALL_DIR)/usr/bin/bf_tar $(1)/usr/bin/

mail/bogofilter/files/postfix-bogofilter

@@ -0,0 +1,34 @@
+#!/bin/sh
+
+FILTER=/usr/bin/bogofilter
+FILTER_DIR=/mnt/sda1/var/spool/bogofilter
+# WARNING! The -i is crucial, else you may see
+# messages truncated at the first period that is alone on a line
+# (which can happen with several kinds of messages, particularly
+# quoted-printable)
+# -G is ignored before Postfix 2.3 and tells it that the message
+# does not originate on the local system (Gateway submission),
+# so Postfix avoids some of the local expansions that can leave
+# misleading traces in headers, such as local address
+# canonicalizations.
+POSTFIX="/usr/sbin/sendmail -G -i"
+export BOGOFILTER_DIR=/var/lib/bogofilter
+
+# Exit codes from <sysexits.h>
+EX_TEMPFAIL=75
+EX_UNAVAILABLE=69
+
+cd $FILTER_DIR || \
+    { echo $FILTER_DIR does not exist; exit $EX_TEMPFAIL; }
+
+# Clean up when done or when aborting.
+trap "rm -f msg.$$ ; exit $EX_TEMPFAIL" 0 1 2 3 15
+
+# bogofilter -e returns: 0 for OK, nonzero for error
+rm -f msg.$$ || exit $EX_TEMPFAIL
+$FILTER -p -e > msg.$$ || exit $EX_TEMPFAIL
+
+exec <msg.$$ || exit $EX_TEMPFAIL
+rm -f msg.$$ # safe, we hold the file descriptor
+exec $POSTFIX "$@"
+exit $EX_TEMPFAIL