(Linux only for now) With fastboot reading serial numbers from sysfs, it had
become possible for a fastboot command issued immediately after rebooting
the bootloader to fail, because sysfs still thought the device was online.
To prevent this, after reboot-bootloader we wait for the device to disconnect.
Also made usb_read and usb_write fail immediately if the descriptor has been
closed; this prevents an incorrect error message ("Bad file descriptor")
when errors from fb_getvar are ignored (e.g., by fb_format_supported).
Also removed unused fd param from filter_usb_device, and simplified logic
in usb_write by using do/while instead of a special case for len == 0.
Change-Id: I799b857eab411fd8ad25f5777fc61c685152ea86
For manufacturing and testing, there is a need to talk to
whatever device is connected to a given port on the host. This
change modifies fastboot's "-s" option to take either a serial
number or a device path. The device paths of the connected
devices can be listed using "fastboot -l devices" whose output
will resemble:
016B75D60A00600D usb:2-5 fastboot
AD3C12020173 usb:1-4.3 fastboot
The second column lists the device paths. If the -l option is
not given, the output from "fastboot devices" will be the same as
it used to be (i.e. the paths will not be printed).
Finally, note that the format of the device paths are platform
dependent. The example above is from Linux. On OS-X, the paths
will be "usb:" followed by hex digits. For Windows, the device
paths will be printed as "????????????" and the -s option will
not be able to select a device until someone implements the
underlying functionality in usb_windows.c.
Change-Id: I1f01b8f47acd32edb0ac18db107316a2c923bbde
Signed-off-by: Scott Anderson <saa@android.com>
Without this patch, "adb devices" will say "no permissions" when it sees
a device it can't write to, but "fastboot devices" will silently ignore it.
This is confusing to n00bs, especially since it doesn't seem to be widely
known that a device's USB id might be different in the bootloader (meaning
two udev rules are needed). It can also be confusing if you're sshed in,
when you can't access the device because you won't be in the "plugdev"
group, but "fastboot devices" won't make this clear.
I'm not sure about the Mac OS and Windows changes. AIUI, devices are always
writable on those platforms, but I don't use either, so I can't test this.
This patch shouldn't alter the behavior on either of those platforms.
