[Pkg-phototools-devel] Bug#727217: libusbx debug noise

[Aurelien Jarno]

On Wed, Oct 23, 2013 at 04:10:48PM +0200, Yuri D'Elia wrote:
> Package: gphoto2
> Version: 2.4.14-1
> Severity: normal
> 
> I'm getting a ton of libusbx debug output when invoking gphoto2:
> 
> ========================
> $ gphoto2 -L      
> libusbx: debug [libusb_get_device_list]                                        
> libusbx: debug [discovered_devs_append] need to increase capacity
> libusbx: debug [libusb_get_device_descriptor] 
> libusbx: debug [libusb_get_device_descriptor] 
> libusbx: debug [libusb_get_device_descriptor] 
> libusbx: debug [libusb_get_device_descriptor] 
> libusbx: debug [libusb_get_device_descriptor] 
> libusbx: debug [libusb_get_device_descriptor] 
> libusbx: debug [libusb_get_device_descriptor] 
> libusbx: debug [libusb_get_device_descriptor] 
> libusbx: debug [libusb_get_device_descriptor] 
> libusbx: debug [libusb_get_device_descriptor] 
> libusbx: debug [libusb_get_device_descriptor] 
> libusbx: debug [libusb_get_device_descriptor] 
> libusbx: debug [libusb_get_device_descriptor] 
> libusbx: debug [libusb_get_device_descriptor] 
> libusbx: debug [libusb_get_config_descriptor] index 0
> libusbx: debug [libusb_exit] 
> libusbx: debug [libusb_exit] destroying default context
> libusbx: debug [libusb_get_device_list] 
> libusbx: debug [discovered_devs_append] need to increase capacity
> libusbx: debug [libusb_get_device_descriptor] 
> libusbx: debug [libusb_get_device_descriptor] 
> libusbx: debug [libusb_get_device_descriptor] 
> libusbx: debug [libusb_get_device_descriptor] 
> libusbx: debug [libusb_get_device_descriptor] 
> libusbx: debug [libusb_get_device_descriptor] 
> libusbx: debug [libusb_get_device_descriptor] 
> libusbx: debug [libusb_get_device_descriptor] 
> libusbx: debug [libusb_get_device_descriptor] 
> libusbx: debug [libusb_get_device_descriptor] 
> libusbx: debug [libusb_get_device_descriptor] 
> libusbx: debug [libusb_get_device_descriptor] 
> libusbx: debug [libusb_get_device_descriptor] 
> libusbx: debug [libusb_get_device_descriptor] 
> libusbx: debug [libusb_get_config_descriptor] index 0
> libusbx: debug [parse_configuration] skipping descriptor 0xb
> 
> libusbx: debug [parse_endpoint] skipping descriptor 25
> libusbx: debug [libusb_exit] 
> libusbx: debug [libusb_exit] destroying default context
> libusbx: debug [libusb_get_device_list] 
> libusbx: debug [discovered_devs_append] need to increase capacity
> libusbx: debug [libusb_get_device_descriptor] 
> libusbx: debug [libusb_get_device_descriptor] 
> libusbx: debug [libusb_get_device_descriptor] 
> libusbx: debug [libusb_get_device_descriptor] 
> libusbx: debug [libusb_get_device_descriptor] 
> libusbx: debug [libusb_get_device_descriptor] 
> libusbx: debug [libusb_get_device_descriptor] 
> libusbx: debug [libusb_get_device_descriptor] 
> libusbx: debug [libusb_get_device_descriptor] 
> libusbx: debug [libusb_get_device_descriptor] 
> libusbx: debug [libusb_get_device_descriptor] 
> libusbx: debug [libusb_get_device_descriptor] 
> libusbx: debug [libusb_get_device_descriptor] 
> libusbx: debug [libusb_get_device_descriptor] 
> libusbx: debug [libusb_get_config_descriptor] index 0
> libusbx: debug [libusb_exit] 
> libusbx: debug [libusb_exit] destroying default context
> There is no file in folder '/'.                                                
> ========================
> 
> The manual page states something about the --debug flag or USB_DEBUG
> environment variable, neither of which I'm using.
> 
> Using --debug-logfile doesn't redirect it either.
> 
> The level of noise is so high that makes the command unuseable.

This is something to be expected, given libghoto2 explicitely asks
libusbx to enable debugging output in libgphoto2_port/libusb1/libusb1.c:

| static int gp_port_usb_init (GPPort *port)
| {
|         port->pl = malloc (sizeof (GPPortPrivateLibrary));
|         if (!port->pl)
|                 return (GP_ERROR_NO_MEMORY);
|         memset (port->pl, 0, sizeof (GPPortPrivateLibrary));
| 
|         port->pl->config = port->pl->interface = port->pl->altsetting = -1;
| 
|         libusb_init (&port->pl->ctx);
|         libusb_set_debug (port->pl->ctx, 255);
| ...

-- 
Aurelien Jarno                          GPG: 1024D/F1BCDB73
aurelien at aurel32.net                 http://www.aurel32.net