[cups.development] [RFE] STR #2799: Allow filters and backends to differentiate between a job and its banner page(s)

[Jerome Alet]

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[STR New]

Currently backends (and filters ?) cannot determine if they have been
launched to print a banner page or the real job's datas.
The CUPS scheduler should provide an additional environment variable for
this, and/or provide an IPP request API. A backend could then check the
value of this environment variable (preferably), or use this API, to learn
if it was launched to print the start banner, the real job, or the end
banner.

A single environment variable, for example JOBTYPE, or JOBSHEETS (to be
similar to the job-sheets option), could hold values such as textual
non-localized uppercase values like 'START', 'END' or 'JOB', to reflect
the fact that the backend (filter ?) was launched to print respectively
the starting banner, the ending banner, or the job itself.

Link: http://www.cups.org/str.php?L2799
Version:  -feature