Add interface with json schema, fix flake-less issues, put setActivate and jsonSchema check in flake lib

2 files changed, 135 insertions, 0 deletions

diff --git a/interface/README.md b/interface/README.md
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index 0000000..c6b52bd
--- /dev/null
+++ b/interface/README.md
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+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`.
diff --git a/interface/deploy.json b/interface/deploy.json
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index 0000000..aaa6534
--- /dev/null
+++ b/interface/deploy.json
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+{
+    "$schema": "http://json-schema.org/draft/2019-09/schema#",
+    "title": "Deploy",
+    "description": "Matches a correct deploy attribute of a flake",
+    "definitions": {
+        "generic_settings": {
+            "type": "object",
+            "properties": {
+                "sshUser": {
+                    "type": "string"
+                },
+                "user": {
+                    "type": "string"
+                },
+                "sshOpts": {
+                    "type": "array",
+                    "items": {
+                        "type": "string"
+                    }
+                },
+                "fastConnection": {
+                    "type": "boolean"
+                },
+                "autoRollback": {
+                    "type": "boolean"
+                }
+            }
+        },
+        "node_settings": {
+            "type": "object",
+            "properties": {
+                "hostname": {
+                    "type": "string"
+                }
+            },
+            "required": [
+                "hostname"
+            ]
+        },
+        "profile_settings": {
+            "type": "object",
+            "properties": {
+                "path": {
+                    "type": "string"
+                },
+                "bootstrap": {
+                    "type": "string"
+                }
+            },
+            "required": [
+                "path"
+            ]
+        }
+    },
+    "type": "object",
+    "allOf": [
+        {
+            "$ref": "#/definitions/generic_settings"
+        },
+        {
+            "type": "object",
+            "properties": {
+                "nodes": {
+                    "type": "object",
+                    "patternProperties": {
+                        "[A-z][A-z0-9_-]*": {
+                            "allOf": [
+                                {
+                                    "$ref": "#/definitions/generic_settings"
+                                },
+                                {
+                                    "$ref": "#/definitions/node_settings"
+                                },
+                                {
+                                    "type": "object",
+                                    "properties": {
+                                        "profiles": {
+                                            "type": "object",
+                                            "patternProperties": {
+                                                "[A-z][A-z0-9_-]*": {
+                                                    "allOf": [
+                                                        {
+                                                            "$ref": "#/definitions/generic_settings"
+                                                        },
+                                                        {
+                                                            "$ref": "#/definitions/profile_settings"
+                                                        }
+                                                    ]
+                                                }
+                                            },
+                                            "additionalProperties": false
+                                        }
+                                    }
+                                }
+                            ]
+                        }
+                    },
+                    "additionalProperties": false
+                }
+            }
+        }
+    ]
+}
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