Re: [Pkg-cups-devel] Bug#681851: escputil: requires module usblp which is blacklisted by CUPS
On 07/24/2012 09:09 AM, Didier 'OdyX' Raboud wrote:
Now for Wheezy, I can't have a solid enough on the changes introduced after
1.5.3-1. 1.5.3-2 didn't migrate because the mips build failed; I suspect this
can be solved by a build on (currently down) ball.debian.org.
Till: are there atomic changes done since 1.5.3-1 that would be worth
integrating into Wheezy? I'm willing to prepare a 1.5.3-2+wheezy0 that would
revert 1.5.3-2 and add the smallest amount of changes towards wheezy if that
helps giving Wheezy a better cups. (Keeping in mind that the Release Team will
review the diff between 1.5.3-1 and whatever we want in wheezy.)
The changes are the following:
1. Addition of the ipp14 backend: The ipp14 backend is nothing else that
the IPP backend of CUPS 1.4.x, which is code which has been in Debian
for longer time already. I have re-added it but to not drop the new
backend of 1.5.x with its new fixes and better standards compliance, I
have added the old code as ipp14 backend. This backend will never be
used automatically so regressions are not possible, but for the case of
the new backend causing problems the user can switch to ipp14 manually.
Changes are debian/patches/add-ipp-backend-of-cups-1.4.patch with the
code and the Makefile entries and addition of an "ipp14" entry in Debconf.
This avoids regressions by incompatibilities of the new ipp backend with
some devices (especially LiveBox router).
2. Improvements of the USB backend: These improvements fix several
compatibility problems of the new libusb-based USB CUPS backend,
especially it adds support for uni-directional devices, quirk management
for devices with incompatibilities, and more. All changes are in
debian/patches/usb-backend-further-enhancements.patch. Important here is
to take the patch of at least cups 1.5.3-4 to have all fixes. It is also
not possible to separate the fixes as the bugs got fixed by combinations
of them.
This fix solves many problems of the original libusb-based USB backend,
especially one does not need to blacklist the usblp kernel module to
work around some of these problems.
3. Blacklisting of the usblp kernel module: In CUPS 1.5.3 the USB kernel
module is blacklisted to work around several problems of the
libusb-based USB CUPS backend. This causes other problems, especially
ink level checkers like escputil and ink do not work, but also some CUPS
backends coming with proprietary drivers from printer manufacturers do
not work.
In 1.5.3-3 I have lifted the blacklisting again as with the fixes of the
USB backend (2) the blacklisting is not needed any more.
All these changes got accepted as an SRU (Stable Release Update) for
Ubuntu Precise and as the package got released for testing 5 of the 6
reported bugs got verified as fixed witb these changes by their
reporters, no regressions caused by these changes got reported.
I recommend to take them all into Wheezy as they fix a lot of bugs.
Finally, #640939 should probably be fixed in Wheezy and we should avoid
letting #682426 enter Wheezy either.
Bug #640939 (http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=640939) is
not affected by the fixes mentioned above. Important for the CUPS
package is that all calls of lpstat/lpinfo/lpadmin/lpr/lp/... in the
maintainer scripts have to be done with "-h /var/run/cups/cups.sock" to
assure that they never access a remote print server, even if there is a
client.conf file pointing to a remote server. Default cupsd.conf needs
to "Listen /var/run/cups/cups.sock" line, even if there are other Listen
or Port lines to let CUPS listen to requests from the network. This
should be already the case, please check.
Printer driver packages should always use the CUPS trigger and never
their own PPD file updaters in their maintainer scripts, please check.
In Ubuntu we have all this in place and do not get such bug reports.
Bug #682426 (http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=682426) is
not a CUPS bug. It needs to get reassigned to Ghostscript. The user
needs to be asked to attach the input file and the bug needds to get
forwarded upstream to Ghostscript. As workaround adjustments in
cups-filters can be applied. In CUPS nothing can be done about it.
Till
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