Processes

Starting with a simple example:

devenv.nix

{ pkgs, ... }:

{
  processes = {
    silly-example.exec = "while true; do echo hello && sleep 1; done";
    ping.exec = "ping localhost";
  };
}

To start the processes in the foreground, run:

$ devenv up
Starting processes ...

20:37:44 system          | ping.1 started (pid=4094686)
20:37:44 system          | silly-example.1 started (pid=4094688)
20:37:44 silly-example.1 | hello
20:37:44 ping.1          | PING localhost (127.0.0.1) 56 bytes of data.
20:37:44 ping.1          | 64 bytes from 127.0.0.1: icmp_seq=0 ttl=64 time=0.127 ms
20:37:45 silly-example.1 | hello
20:37:45 ping.1          | 64 bytes from 127.0.0.1: icmp_seq=1 ttl=64 time=0.257 ms
20:37:46 silly-example.1 | hello
20:37:46 ping.1          | 64 bytes from 127.0.0.1: icmp_seq=2 ttl=64 time=0.242 ms
20:37:47 silly-example.1 | hello
20:37:47 ping.1          | 64 bytes from 127.0.0.1: icmp_seq=3 ttl=64 time=0.249 ms
...

A set of common services are also available, such as services.postgres.enable for setting up a PostgreSQL process.