docs(tvix/nix-compat): on store paths in fields

Change-Id: Ie78b1c49d7386c70833a3b751799993ad9121aa6
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10933
Tested-by: BuildkiteCI
Autosubmit: Peter Kolloch <info@eigenvalue.net>
Reviewed-by: flokli <flokli@flokli.de>

tvix/nix-compat/src/derivation/mod.rs

@@ -32,12 +32,15 @@ pub struct Derivation {
     #[serde(rename = "env")]
     pub environment: BTreeMap<String, BString>,
 
+    /// Map from drv path to output names used from this derivation.
     #[serde(rename = "inputDrvs")]
     pub input_derivations: BTreeMap<String, BTreeSet<String>>,
 
+    /// Plain store paths of additional inputs.
     #[serde(rename = "inputSrcs")]
     pub input_sources: BTreeSet<String>,
 
+    /// Maps output names to Output.
     pub outputs: BTreeMap<String, Output>,
 
     pub system: String,

tvix/nix-compat/src/derivation/output.rs

@@ -4,8 +4,10 @@ use crate::store_path::StorePathRef;
 use serde::{Deserialize, Serialize};
 use serde_json::Map;
 
+/// References the derivation output.
 #[derive(Clone, Debug, Default, Eq, PartialEq, Serialize)]
 pub struct Output {
+    /// Store path of build result.
     pub path: String,
 
     #[serde(flatten)]