forked from pool/cups-backends
90 lines
3.1 KiB
Bash
90 lines
3.1 KiB
Bash
#! /bin/bash
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# CUPS wrapper backend "pipe" for printing to any program.
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# It forwards the print job data like a pipe into another command.
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# Author: Johannes Meixner <jsmeix@suse.de>, 2009
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# For basic information see "man 7 backend" and "man 7 filter".
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# Activate the "set -x" line to get debugging info in /var/log/cups/error_log:
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#set -x
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# Output "Device Discovery" information on stdout:
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if test "$#" = "0"
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then
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echo 'direct pipe "Unknown" "Forward print job data like a pipe to another command"'
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exit 0
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fi
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# Output usage information in case of wrong number of parameters:
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if test "$#" != "5" -a "$#" != "6"
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then
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echo 'Usage: pipe job-id user title copies options [file]' 1>&2
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echo 'Queue setup example:' 1>&2
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echo 'lpadmin -p queue_name -v "pipe:/path/to/command?option1=value1&-option2&value2" -E' 1>&2
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echo 'The command is called with the specified options as:' 1>&2
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echo '/path/to/command option1=value1 -option2 value2' 1>&2
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echo 'The original command line parameters (... job-id user ...)' 1>&2
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echo 'are provided as environment variables PIPE_BACKEND_ARGV[0-6]' 1>&2
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exit 1
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fi
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# Keep the original command line parameters (... job-id user ...)
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# in environment variables to make them available for the command:
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export PIPE_BACKEND_ARGV0="$0"
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export PIPE_BACKEND_ARGV1="$1"
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export PIPE_BACKEND_ARGV2="$2"
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export PIPE_BACKEND_ARGV3="$3"
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export PIPE_BACKEND_ARGV4="$4"
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export PIPE_BACKEND_ARGV5="$5"
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export PIPE_BACKEND_ARGV6="$6"
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# Have the input at fd0 (stdin) in any case:
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if test -n "$6"
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then
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exec <"$6"
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fi
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# To be on the safe side clip anything after the first space character
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# because spaces are excluded characters in a URI (see RFC 2396):
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URI=${DEVICE_URI%% *}
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# Extract the command to which the job schould be sent from the URI.
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# Clip the URI scheme (anything up to the first ':' character) and
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# clip anything after the first '?' character
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# because anything after the first '?' character are options:
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COMMAND=${URI#*:}
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COMMAND=${COMMAND%%\?*}
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# Extract the options (e.g. from 'pipe:/path/to/command?option1=value1&-option2&value2'
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# clip anything up to the first '?' character and
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# replace the options separator '&' character by a space:
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OPTIONS=${URI#*\?}
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if test "$OPTIONS" = "$URI"
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then
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OPTIONS=""
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fi
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OPTIONS=$( echo "$OPTIONS" | tr '&' ' ' )
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# Options could have been specified in a wrong way
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# as addendum to the DeviceURI separated by spaces
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# (spaces are excluded characters in a URI, see RFC 2396)
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# which works by luck at least for some CUPS versions
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# see https://bugzilla.novell.com/show_bug.cgi?id=499735
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# like 'pipe:/path/to/command option1=value1 -option2 value2'
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# nevertheless use additionally those kind of options too:
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MORE_OPTIONS=${DEVICE_URI#* }
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if test "$MORE_OPTIONS" = "$DEVICE_URI"
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then
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MORE_OPTIONS=""
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fi
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OPTIONS=$( echo "$OPTIONS" "$MORE_OPTIONS" | tr -s ' ' )
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# Test if the command is executable:
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if ! test -x "$COMMAND"
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then
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echo "Cannot execute $COMMAND" 1>&2
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exit 1
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fi
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# Replace this wrapper with the actual command
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# so that it exits with the exit code of the command
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# and that the command gets any signals directly.
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exec "$COMMAND" $OPTIONS
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