A flake must have a `deploy` output with the following structure: ``` deploy ├── <generic args> └── nodes ├── <NODE> │ ├── <generic args> │ ├── hostname │ └── profiles │ ├── <PROFILE> │ │ ├── <generic args> │ │ ├── bootstrap │ │ └── path │ └── <PROFILE>... └── <NODE>... ``` Where `<generic args>` are all optional and can be one or multiple of: - `sshUser` -- user to connect as - `user` -- user to install and activate profiles with - `sshOpts` -- options passed to `nix copy` and `ssh` - `fastConnection` -- whether the connection from this host to the target one is fast (if it is, don't substitute on target and copy the entire closure) [default: `false`] - `autoRollback` -- whether to roll back when the deployment fails [default: `false`] A formal definition for the structure can be found in [the JSON schema](./deploy.json) For every profile of every node, arguments are merged with `<PROFILE>` taking precedence over `<NODE>` and `<NODE>` taking precedence over top-level. Values can be overridden for all the profiles deployed by setting environment variables with the same names as the profile, for example `sshUser=foobar nix run github:serokell/deploy .` will connect to all nodes as `foobar@<NODE>.hostname`.