wait for lock to be acquired

[coryschwartz]

Add a flag to wait until the lock can be acquired.

This is to facilitate lock acquisition in scripts.

This is how it works:

1. create a new lock

   ./filecoin-chain-archiver nodelocker operator lock abc pass
   peerid:abc, acquired:true, expiry:2022-11-04 17:39:56.820841486 -0700 PDT

2. Using the same secret, you can update the lock, as usual.

/filecoin-chain-archiver nodelocker operator lock abc pass
peerid:abc, acquired:true, expiry:2022-11-04 17:40:53.458506528 -0700 PDT

3. Using a new secret, encounter an error trying to get the lock. This is new behavior. We get an exit code telling us the lock was not acquired correctly.

./filecoin-chain-archiver nodelocker operator lock abc pass2
peerid:abc, acquired:false, expiry:2022-11-04 17:41:52.042761722 -0700 PDT
2022-11-04T17:40:55.100-0700    ERROR   filecoin-chain-archiver filecoin-chain-archiver/main.go:44  exit    {"error": "lock not aquired"}

echo $?
1

4. To make things easier, pass the -w flag. This will wait until the lock is acquired. This will continue until we own the lock.

   
   ./filecoin-chain-archiver nodelocker operator lock -w abc pass2
   peerid:abc, acquired:false, expiry:2022-11-04 17:48:02.350208491 -0700 PDT
   peerid:abc, acquired:true, expiry:2022-11-04 17:49:03.357054703 -0700 PDT

echo $? 0