tree 20d74c26df2112515313b0b22c7358427bad8b57
parent f0a9a1a30e60e92cec9bff4cae030478c276da4d
author Shawn O. Pearce <sop@google.com> 1273627293 -0700
committer Shawn O. Pearce <sop@google.com> 1273627907 -0700

sync: kill git fetch process before SSH control master process

If the SSH control master process is killed while an active git
fetch is using its network socket, the underlying SSH client may
not realize the connection was broken.  This can lead to both the
client and the server waiting indefinitely for network messages
which will never be sent.

Work around the problem by keeping track of any processes that use
the tunnels we establish.  If we are about to kill any of the SSH
control masters that we started, ensure the clients using them are
successfully killed first.

Change-Id: Ida6c124dcb0c6a26bf7dd69cba2fbdc2ecd5b2fc
Signed-off-by: Shawn O. Pearce <sop@google.com>