Add a 'host-features' command to get the features of the currently
running host adb server. Abuse it to report libusb status.
Bug: http://b/34983123
Test: adb host-features; adb kill-server; ADB_LIBUSB=1 adb start-server; adb host-features
Change-Id: I0e8d503a2dbdff9002ebb6ce8a298498a9421422
The first time you run adb, it starts the adbd server and annoyingly
generates the following message:
adb I 02-01 11:57:58 99717 99717 usb_dispatch.cpp:30] using native
backend
Drop the severity of the message to avoid visible spammy messages only
intended for debugging.
Test: code compiles and no more log message in normal adb use
Change-Id: I882092a6cd14bc67980d88416397d51ab8393b1b
Add a libusb-based implementation alongside the existing native
implementations, controlled by the ADB_LIBUSB environment variable.
Windows will need more work for the usb driver.
Bug: http://b/31321337
Test: python test_device.py on linux/darwin, with ADB_LIBUSB=0 and 1
Change-Id: Ib68fb2c6c05475eae3ff4cc19f55802a6f489bb7
