Add additional metadata

src/config.rs

@@ -1,4 +1,5 @@
 use serde::{Deserialize, Serialize};
+use std::collections::HashMap;
 use std::fs;
 use std::io::Error;
 use std::path::Path;
@@ -12,7 +13,13 @@ pub struct Location {
     // access to the "type" and "args" fields) is going to require we
     // know how to deserialise into a union type; for example
     // https://stackoverflow.com/q/66964692
+    //
+    // However, we need to support the 'local' type, which takes no
+    // arguments, so implement enough here to be able to write one.
     pub name: String,
+    #[serde(rename = "type")]
+    pub loc_type: String,
+    pub args: HashMap<String, serde_json::Value>,
 }
 
 #[derive(Serialize, Deserialize, Debug, PartialEq)]
@@ -48,7 +55,12 @@ impl Config {
             use_file_store,
             require_complete_tree,
         };
-        let location: Vec<Location> = Vec::new();
+        let local = Location {
+            name: String::from("local"),
+            loc_type: String::from("local"),
+            args: HashMap::new(),
+        };
+        let location: Vec<Location> = vec![local];
         Ok(Config { core, location })
     }
 }
@@ -86,6 +98,9 @@ mod tests {
     #[test]
     fn can_write_config() {
         let cfg = Config::new(None, true, true).unwrap();
+        assert_eq!(cfg.location.len(), 1);
+        assert_eq!(cfg.location[0].name, "local");
+        assert_eq!(cfg.location[0].loc_type, "local");
         let tmp = tempfile::TempDir::new().unwrap();
         let path = tmp.path();
         fs::create_dir_all(path.join(".outpack")).unwrap();

tests/bad-example/.outpack/config.json

@@ -10,7 +10,7 @@
     {
       "name": "another",
       "type": "file",
-      "args": []
+      "args": {}
     }
   ]
 }

tests/example/.outpack/config.json

@@ -10,12 +10,12 @@
     {
       "name": "local",
       "type": "local",
-      "args": []
+      "args": {}
     },
     {
       "name": "another",
       "type": "file",
-      "args": []
+      "args": {}
     }
   ]
 }