vtysh: Add file locking to Quagga.conf

Problem:

Systemd runs in parallel all quagga daemons after zebra is started up.
Now each command has a ExecStartPost which executes vtysh -b -n.
Each of these vtysh -b -n would blask configuration to each daemon.

This leads to the situation where vtysh process #2 is blasting
in config that is at a different spot in the Quagga.conf file
that vtysh process #1 is at.

If #1 has put itself into a different submode that #2 is at,
we will get failures and the code will not be read in properly.

This problem is especially evident for when you have more than one
protocol running at one time.

Solution:

flock Quagga.conf.
If you don't get the flock, sleep for a while, try to get flock again
go to slepp...

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>
Reviewed-by: Daniel Walton <dwalton@cumulusnetworks.com>
Reviewed-by: Don Slice <dslice@cumulusnetworks.com>
Reviewed-by: DAve Olson <olson@cumulusnetworks.com>

0 files changed, 0 insertions, 0 deletions