Ever wanted to coordinate shell scripts? Use lockutil to acquire a lock or fail:

Script 1:

lock
trap "lock release" INT EXIT

sleep 1000

Script 2:

lock -timeout 10
trap "lock release" INT EXIT

echo "a"

Will print 'a' only after script 1 has finished.

acquire lock

release lock

list all active locks

force a lock release, a secret token must be provided

Wait for this number of seconds to acquire lock. If it takes longer, it fails.

The port to connect to, defaulting to 50051

The host to connect to, defaulting to localhost

The name of the lock to acquire, defaulting to 'default'

Prints help a message

Enables verbose logging

The port to listen on, defaulting to 50051

The host address to listen on, defaulting to localhost

The name of the lock to acquire, defaulting to 'default'

Prints a help message

pass to enable forcefully unlocks

In lockutil.go a client library is provided for use in go applications.