fix config set dry

core/startos/src/config/mod.rs

@@ -1,3 +1,4 @@
+use std::collections::BTreeSet;
 use std::sync::Arc;
 use std::time::Duration;
 
@@ -178,13 +179,68 @@ pub struct SetParams {
 // )]
 #[instrument(skip_all)]
 pub fn set<C: Context>() -> ParentHandler<C, SetParams, PackageId> {
-    ParentHandler::new().root_handler(
-        from_fn_async(set_impl)
-            .with_metadata("sync_db", Value::Bool(true))
-            .with_inherited(|set_params, id| (id, set_params))
-            .no_display()
-            .with_call_remote::<CliContext>(),
-    )
+    ParentHandler::new()
+        .root_handler(
+            from_fn_async(set_impl)
+                .with_metadata("sync_db", Value::Bool(true))
+                .with_inherited(|set_params, id| (id, set_params))
+                .no_display()
+                .with_call_remote::<CliContext>(),
+        )
+        .subcommand(
+            "dry",
+            from_fn_async(set_dry)
+                .with_inherited(|set_params, id| (id, set_params))
+                .no_display()
+                .with_call_remote::<CliContext>(),
+        )
+}
+
+pub async fn set_dry(
+    ctx: RpcContext,
+    _: Empty,
+    (
+        id,
+        SetParams {
+            timeout,
+            config: StdinDeserializable(config),
+        },
+    ): (PackageId, SetParams),
+) -> Result<BTreeSet<PackageId>, Error> {
+    let mut breakages = BTreeSet::new();
+
+    let procedure_id = Guid::new();
+
+    let db = ctx.db.peek().await;
+    for dep in db
+        .as_public()
+        .as_package_data()
+        .as_entries()?
+        .into_iter()
+        .filter_map(
+            |(k, v)| match v.as_current_dependencies().contains_key(&id) {
+                Ok(true) => Some(Ok(k)),
+                Ok(false) => None,
+                Err(e) => Some(Err(e)),
+            },
+        )
+    {
+        let dep_id = dep?;
+
+        let Some(dependent) = &*ctx.services.get(&dep_id).await else {
+            continue;
+        };
+
+        if dependent
+            .dependency_config(procedure_id.clone(), id.clone(), config.clone())
+            .await?
+            .is_some()
+        {
+            breakages.insert(dep_id);
+        }
+    }
+
+    Ok(breakages)
 }
 
 #[derive(Default)]