feat: automated node config path args

The user previously had to specify the location of our generated config
file. This change removes this requirement -- since we generate it, we
should also pass on the information to the node.

README.md

@@ -23,11 +23,11 @@ Ziggurat is configured with a `config.toml` file in the root.
 ```toml
 kind = "zebra"
 path = "path/to/zebra/repo"
-start_command = "cargo +stable r -- --config zebra.toml --verbose start"
+start_command = "cargo +stable r -- --verbose start"
 
 # kind = "zcashd"
 # path = "path/to/zcash/repo"
-# start_command = "./src/zcashd -debug=1 -dnsseed=0 -printtoconsole -logips=1 -listenonion=0 -dns=0 -conf=/path/to/zcash/repo/zcash.conf"
+# start_command = "./src/zcashd -debug=1 -dnsseed=0 -printtoconsole -logips=1 -listenonion=0 -dns=0"
 ```
 
 Information about the node to be tested can be set under the `[node]` table:

src/setup/node.rs

@@ -67,11 +67,35 @@ impl Node {
         let config = NodeConfig::new();
         let meta = NodeMetaData::new()?;
 
-        Ok(Self {
+        let mut node = Self {
             config,
             meta,
             process: None,
-        })
+        };
+
+        // insert the config file cmd args
+        match node.meta.kind {
+            NodeKind::Zebra => {
+                // Bit more convoluted since we need to insert the args before `start`, which comes last.
+                let start_arg = node
+                    .meta
+                    .start_args
+                    .pop()
+                    .expect("Expected at least one arg for Zebra (`start`)");
+                node.meta.start_args.push("--config".into());
+                node.meta
+                    .start_args
+                    .push(node.config_filepath().into_os_string());
+                node.meta.start_args.push(start_arg);
+            }
+            NodeKind::Zcashd => {
+                node.meta
+                    .start_args
+                    .push(format!("-conf={}", node.config_filepath().to_str().unwrap()).into());
+            }
+        }
+
+        Ok(node)
     }
 
     /// Returns the (external) address of the node.