Some devices may not boot up fast enough when battery check
is done as it currently is in adb.go. Therefore,
getBatteryLevel() is modified to take in a parameter to determine
the number of times to retry before giving up.
For Suzy-Q we matched usb bus/port between adb and console device.
This is not possible for separate serial cables: bus/port are unrelated.
So switch to a different algorithm that supports both Suzy-Q and separate cables.
The overall idea is as follows. We use 'adb shell' to write a unique string onto console,
then we read from all console devices and see on what console the unique string appears.
Log is a simple wrapper around std log package.
It is meant to solve 2 main problems:
1. Logging from non-main packages (mainly, vm/* packages).
Currently they can either always log or not log at all.
But they can't respect program verbosity setting.
Log package allows all packages to use the same verbosity setting.
2. Exposing recent logs in html UI.
Namely we want to tee logs to console and html UI.
Issue #70 reports that a device can be permanently OOM,
if we don't reboot it new fuzzers will be always killed.
And it's generally safer to assume that a device is in
some bad shape initially. So always reboot them on start.
Fixes#70
One common issue we see with android devices is that
fuzzing drains battery episodically, device goes down and
then does not boot until one presses the power button.
Check battery level at the beginning of each cycles
and wait if it is too low.
Current numbers are: wait if level < 20% until it is >=30%.
Let's see how it works.
Fixes#79
The code to detect the ttyUSB number that a Suzy-Q connected device was
exposing wasn't handling the case when the devices were plugged in via a
USB hub (which extends the port numbering scheme). This CL changes the
regexp to detect the serial correctly in these cases as well.
Add timeout to adb invocations and do more reliable reboot.
Clean up temporary files from previous runs.
Also pass enabled syscalls via rpc, as adb barks at too long command line.
Abd is still unreliable, though. Devices hang.
