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authorVincent Ambo <mail@tazj.in>2023-03-03T21·06+0300
committertazjin <tazjin@tvl.su>2023-03-13T20·30+0000
commitdfd0066de5f0616673f8e6cef4c6bed312e98d1e (patch)
tree5dd8ed908b155ec7f1faea6dd692cbd09ee6585b /tvix/eval/src/builtins/mod.rs
parent7d339d27627de12e7dc99f823e84c381281babfc (diff)
fix(tvix/eval): handle toJSON on attribute sets with `outPath` r/5977
These are serialised as the serialisation of the value of that field.

Change-Id: Ida51708b1f43ce09b0ec835f4e265918aa31dd09
Reviewed-on: https://cl.tvl.fyi/c/depot/+/8205
Reviewed-by: raitobezarius <tvl@lahfa.xyz>
Tested-by: BuildkiteCI
Diffstat (limited to 'tvix/eval/src/builtins/mod.rs')
-rw-r--r--tvix/eval/src/builtins/mod.rs29
1 files changed, 23 insertions, 6 deletions
diff --git a/tvix/eval/src/builtins/mod.rs b/tvix/eval/src/builtins/mod.rs
index a9d04ba7c3fb..535bf8b2a305 100644
--- a/tvix/eval/src/builtins/mod.rs
+++ b/tvix/eval/src/builtins/mod.rs
@@ -359,13 +359,30 @@ mod pure_builtins {
 
     #[builtin("toJSON")]
     async fn builtin_to_json(co: GenCo, val: Value) -> Result<Value, ErrorKind> {
-        if let Value::Attrs(attrs) = &val {
-            // Attribute sets with a callable `__toString` attribute
-            // serialise to the string-coerced version of the result of
-            // calling that.
-            if let Some(s) = attrs.try_to_string(&co, CoercionKind::Weak).await {
-                return Ok(Value::String(serde_json::to_string(&s)?.into()));
+        let mut val = val; // shadow mutably, not supported by macro
+        loop {
+            if let Value::Attrs(attrs) = &val {
+                // Attribute sets with a callable `__toString` attribute
+                // serialise to the string-coerced version of the result of
+                // calling that.
+                if let Some(s) = attrs.try_to_string(&co, CoercionKind::Weak).await {
+                    return Ok(Value::String(serde_json::to_string(&s)?.into()));
+                }
+
+                // Attribute sets with an `outPath` attribute
+                // serialise to a JSON serialisation of that inner
+                // value (regardless of what it is!).
+                if let Some(out_path) = attrs.select("outPath") {
+                    val = out_path.clone();
+                    continue;
+                }
+
+                // Attribute set should be serialised normally (by
+                // traversing it and serialising keys/values).
+                break;
             }
+
+            break;
         }
 
         // All thunks need to be evaluated before serialising, as the