Bug#773906: files left over in /var/spool/cups/tmp after job cancellation

[Sergio Gelato <Sergio.Gelato@astro.su.se>]

Package: cups
Version: 1.5.3-5+deb7u4

Filing this bug against cups rather than cups-filters (1.0.18-2.1+deb7u1)
because I think the immediate culprit is /usr/lib/cups/filter/pstops, which
in this version belongs to the cups package. Feel free to reassign if need be.

I'm regularly seeing leftover temporary files in /var/spool/cups/tmp, as in:
  7224 1844 -rw-------   1 lp       lp        1884410 Dec 22 13:34 /var/spool/cups/tmp/gs_GpMpig
  7528    0 -rw-------   1 lp       lp              0 Dec 22 13:34 /var/spool/cups/tmp/gs_6nFAd2
  6636   24 -rw-------   1 lp       lp          21688 Dec 22 13:34 /var/spool/cups/tmp/gs_thHPkn
  7265 23748 -rw-------   1 lp       lp       24314754 Dec 22 13:34 /var/spool/cups/tmp/gs_v58Zf9

Until I started cleaning them up in a cron job these would accumulate and
eventually result in the system running out of spool space. The printer is
set up as a PostScript printer (HP CLJE CP4525 with HP-supplied PPD).

Correlating the time stamps with /var/log/cups/access_log suggests that this
happens whenever a user cancels a job that has already started printing.

I'm planning (for other reasons, see #682426, #664538) to try and switch to
a PDF-oriented PPD, which I hope will work around this issue, but fixing it
should still be of interest to users of printers that lack functional native
PDF support.