migrate old sandbox spec format when reading logs

src/inspect_ai/_view/www/dist/assets/index.js

@@ -63351,9 +63351,14 @@ ${events}
         config2["model_base_url"] = evaluation.model_base_url;
       }
       if (evaluation == null ? void 0 : evaluation.sandbox) {
-        config2["sandbox"] = evaluation.sandbox[0];
-        if (evaluation.sandbox[1]) {
-          config2["sandbox_config"] = evaluation.sandbox[1];
+        if (Array.isArray(evaluation == null ? void 0 : evaluation.sandbox)) {
+          config2["sandbox"] = evaluation.sandbox[0];
+          if (evaluation.sandbox[1]) {
+            config2["sandbox_config"] = evaluation.sandbox[1];
+          }
+        } else {
+          config2["sandbox"] = evaluation == null ? void 0 : evaluation.sandbox.type;
+          config2["sandbox_config"] = evaluation == null ? void 0 : evaluation.sandbox.config;
         }
       }
       const taskColumns = [];

src/inspect_ai/_view/www/src/plan/PlanDetailView.tsx

@@ -80,9 +80,14 @@ export const PlanDetailView: FC<PlanDetailViewProps> = ({
   }
 
   if (evaluation?.sandbox) {
-    config["sandbox"] = evaluation.sandbox[0];
-    if (evaluation.sandbox[1]) {
-      config["sandbox_config"] = evaluation.sandbox[1];
+    if (Array.isArray(evaluation?.sandbox)) {
+      config["sandbox"] = evaluation.sandbox[0];
+      if (evaluation.sandbox[1]) {
+        config["sandbox_config"] = evaluation.sandbox[1];
+      }
+    } else {
+      config["sandbox"] = evaluation?.sandbox.type;
+      config["sandbox_config"] = evaluation?.sandbox.config;
     }
   }
 

src/inspect_ai/log/_log.py

@@ -295,7 +295,7 @@ def migrate_deprecated(
             # warning will handle this)
             del values["transcript"]
 
-        return values
+        return migrate_sandbox_spec(values)
 
     # allow field model_usage
     model_config = ConfigDict(protected_namespaces=())
@@ -607,6 +607,23 @@ class EvalSpec(BaseModel):
     # allow field model_args
     model_config = ConfigDict(protected_namespaces=())
 
+    @model_validator(mode="before")
+    @classmethod
+    def read_sandbox_spec(
+        cls: Type["EvalSpec"], values: dict[str, Any]
+    ) -> dict[str, Any]:
+        return migrate_sandbox_spec(values)
+
+
+def migrate_sandbox_spec(values: dict[str, Any]) -> dict[str, Any]:
+    if "sandbox" in values:
+        sandbox = values.get("sandbox")
+        if isinstance(sandbox, list):
+            values["sandbox"] = SandboxEnvironmentSpec(
+                type=sandbox[0], config=sandbox[1]
+            )
+    return values
+
 
 def eval_error(
     exception: BaseException,