Device URIs are not stable between releases

[michaelrsweet]

Version: 1.4rc1
CUPS.org User: twaugh.redhat

Some devices are given different device URIs in 1.4rc1 from the ones they were assigned in CUPS 1.3.10. For example:

usb:https://Lexmark/Lexmark%20E120 (1.4rc1)
usb:https://Lexmark/E120 (1.3.10)

Is this intentional? If so, the usb backend (for instance) ought to continue to accept the older-style device URIs.

The particular change that gave rise to this difference is subversion revision 7584.

Original bug report:
https://bugzilla.redhat.com/show_bug.cgi?id=507244
(showing that the correct device URI is now 'usb:https://Lexmark/Lexmark%20E120')

Other supporting evidence:
http:https://bbs.archlinux.org/viewtopic.php?id=64074
(showing that the correct device URI was once 'usb:https://Lexmark/E120')

[michaelrsweet]

CUPS.org User: mike

For the same backend it shouldn't change, however 1.4 now defaults to the libusb-based backend on Linux which may get different information than the old kernel printer device...

[michaelrsweet]

CUPS.org User: twaugh.redhat

Sorry, I should have said: I am not using libusb in my configuration at the moment. This is just about the change in the way the device URI is constructed from the IEEE 1284 Device ID, in the function backendGetDeviceID().

The old behaviour was to strip the manufacturer name from the model name if it appeared there (e.g. if we had 'MFG:Lexmark' and 'MDL:Lexmark E120' we'd have scheme:https://Lexmark/E120).

The new behaviour is to use the Device ID fields exactly as they are for the purposes of creating a device URI, e.g. scheme:https://Lexmark/Lexmark%20E120.

[michaelrsweet]

CUPS.org User: mike

Fixed in Subversion repository.

[michaelrsweet]

"str3259.patch":

Index: backend/ieee1284.c

--- backend/ieee1284.c (revision 8751)
+++ backend/ieee1284.c (working copy)
@@ -306,6 +306,14 @@
mfg = temp;
}

• if (!strncasecmp(mdl, mfg, strlen(mfg)))
• {

•  mdl += strlen(mfg);
  

•  while (isspace(*mdl & 255))
  

•    mdl ++;
  

• }

/*

• Generate the device URI from the manufacturer, make_model, and
• serial number strings.