Public bug reported:
For development of printing infrastructure I use a test CUPS backend
(attached, to be installed in /usr/lib/cups/backend/ and to be made
executable) reporting printers as detected which in reality do not
exist, so that I do not need the actual printer models for the test.
Other users use manufacturer-supplied printer drivers which bring their
own CUPS backends, and Ubuntu also ships the "hpfax" backend which is
not in the hard-coded list.
The source code of gnome-control-center, file panels/printers/pp-utils.c
contains
----------
[...]
static void
get_device_attributes_async_scb (GHashTable *result,
gpointer user_data)
{
[...]
const gchar *backends[] =
{"hpfax", "ncp", "beh", "bluetooth", "snmp",
"dnssd", "hp", "ipp", "lpd", "parallel",
"serial", "socket", "usb", NULL};
[...]
----------
and tests show that the tool is actually only discovering printers
through these backends. It is easy to make CUPS using all backends for
detecting printers, one can do it by a single function call. Other
printer setup tools do it this way and I expect gnome-control-center to
also use all CUPS backends, so that users who use special backends can
set up their printers.
** Affects: gnome-control-center (Ubuntu)
Importance: High
Status: New
** Attachment added: "/usr/lib/cups/backend/testbackend"
https://bugs.launchpad.net/bugs/1115653/+attachment/3514989/+files/testbackend
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https://bugs.launchpad.net/bugs/1115653
Title:
GNOME Printer Setup Tool: Printers are discovered only through a hard-
coded list of CUPS backends
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