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A flake must have a `deploy` output with the following structure:
```
deploy
├── <generic args>
└── nodes
├── <NODE>
│ ├── <generic args>
│ ├── hostname
│ ├── profilesOrder
│ └── profiles
│ ├── <PROFILE>
│ │ ├── <generic args>
│ │ ├── bootstrap
│ │ ├── profilePath
│ │ └── 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.
Certain read values can be overridden by supplying flags to the deploy binary, for example `deploy --auto-rollback true .` will enable automatic rollback for all nodes being deployed to, regardless of settings.
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