tree e6ec7e9fe91af3f6cc1dc999aa61cd27e285ec80
parent 86e0c564d3001bffe84ac4c3ef861b128b2b9477
author Brian O'Connor <bocon@opennetworking.org> 1511836808 -0800
committer Brian O'Connor <bocon@opennetworking.org> 1511838284 -0800

Fixing checkstyle test hang with nc version >= 1.110

netcat (nc) 1.110 changed the behavior of how sockets are closed when
stdin is at EOF or closed. Previously, nc would call shutdown (TCP FIN
on the write side of the socket) when the end of stdin was reached.
Now, shutdown is only called if '-N' is passed as an argument.

This change was introduced into Ubuntu's fork of OpenBSD nc in Nov. 2016.
So, the affected versions were Ubuntu 17.04+ as well as any other
distribution that uses nc >= 1.110.

This change of behavior causes the call to ByteStreams.toByteArray()
to hang indefinietly, and thus checkstyle tests to hang indefinitely.

Rather than try to figure out which version of nc is present and set
the -N option, we will use an empty line as a sentinel and stop parsing
input when the first empty line is encountered. For this, we need two
changes: (1) send a newline when checking the socket in start-buck-daemon
and (2) send a newline at the end of the file list in onos.bucklet

We also set SO_TIMEOUT to 1 second and will return an exception if
the socket times out. This will prevent tests from hanging indefinitely.

Change-Id: If46b4b78ae89312e1afa0563f63100ae67762f0a