Simple CUPS backend wrapper for Canon LBP-810 and LBP-1120 FOSS driver

capt

#!/bin/sh

# What's this
# -----------
# CUPS backend wrapper for Canon LBP-810 and LBP-1120 FOSS driver.
# Works for me with LBP-1120 on Ubuntu 12.04.
#
# Because I don't want a kludge with dummy serial:/dev/ttyS0 backend,
# as everyone on the 'net seem to suggest. That never worked for me.
# Nor I want to use Canon proprietary ccpd daemon, which frequently
# just fails to talk to the printer for unknown reason.
#
# Yes, this is a hack, too. Maybe I'll patch capt (and its PPD) later,
# to make things straight. Drop me a note if you already did. I'm lazy.
#
# Installation/usage
# ------------------
# 1. Install capt binary from http://www.boichat.ch/nicolas/capt/
#    Specify path to it below (in gs pipe near the end), if necessary.
#
# 2. Put this script to /usr/lib/cups/backend.
#    Don't forget to chmod +x capt.
#
# 3. Ensure usblp module is not blacklisted and you have /dev/usb/lp*
#    No need to change permissions on device files, this script will be
#    ran as "lp" user and group, which should already have access to it.
#
# 4. Add "CAPT printer on ..." with driver "Generic PostScript Printer"
#    (NOT the "Canon LBP-810 Foomatic/capt")
#
#        lpadmin -p LASER-SHOT-LBP-1120 \
#                -m "Generic PostScript Printer" \
#                -v capt:/dev/usb/lp0 -E'
#
#    should hopefully do the job, although I've just edited autodetected
#    USB printer using the CUPS web interface at http://localhost:631/admin/.
#
# 5. Things should work. Occasionally, they don't and driver's stuck,
#    but power-cycling the printer seem to help.
#

if test "$#" = "0"; then
    for idx in seq 0 9; do
        DEVICE="/dev/usb/lp$idx"
        if test -w "$DEVICE"; then
            echo "direct capt:$DEVICE \"Unknown\" \"CAPT printer on $DEVICE\""
        fi
    done
    exit 0
fi

if test -n "$6"; then
    exec <"$6"
fi

DEVICE=$(echo "$DEVICE_URI" | cut -c6-)

if test ! -w "$DEVICE"; then
    if test ! -e "$DEVICE"; then
        echo "ERROR: no write permissions on $DEVICE"
    else
        echo "ERROR: device $DEVICE does not exists"
    fi
    exit 1
fi

echo "INFO: sending data to $DEVICE" 1>&2
gs -q -dNOPAUSE -dPARANOIDSAFER -dBATCH -r600x600 -sDEVICE=pbmraw -sOutputFile="|capt 1>/tmp/capt.log" -
echo 'INFO:' 1>&2

exit 0

Thank you very much. It works perfectly (using LBP-1120).