To avoid connectivity problems, we don't want the ssh process
that is started by git fetch to become a ControlMaster for the
overall sync task. If it did, we would lose connectivity when
git fetch was finished with the current project, causing later
projects to not fetch efficiently.
Change-Id: I8d0dcf9b361276ff8c8b5a6324cbd4a501e9c4dd
Signed-off-by: Shawn O. Pearce <sop@google.com>
By creating a background ssh "control master" process which lives
for the duration of our sync cycle we can easily cut the time for
a no-op sync of 132 projects from 60s to 18s.
Bug: REPO-11
Signed-off-by: Shawn O. Pearce <sop@google.com>
