fix(config): fallback when user info unavailable (#29332)

packages/opencode/src/config/config.ts

@@ -762,7 +762,14 @@ export const layer = Layer.effect(
           result.permission = mergeDeep(perms, result.permission ?? {})
         }
 
-        if (!result.username) result.username = os.userInfo().username
+        if (!result.username) {
+          try {
+            result.username = os.userInfo().username || "user"
+          } catch (err) {
+            log.warn("failed to read system username, using fallback", { err })
+            result.username = "user"
+          }
+        }
 
         if (result.autoshare === true && !result.share) {
           result.share = "auto"

packages/opencode/src/config/managed.ts

@@ -46,7 +46,14 @@ export function parseManagedPlist(json: string): string {
 export async function readManagedPreferences() {
   if (process.platform !== "darwin") return
 
-  const user = os.userInfo().username
+  const user = (() => {
+    try {
+      return os.userInfo().username || "user"
+    } catch (err) {
+      log.warn("failed to read system username, using fallback", { err })
+      return "user"
+    }
+  })()
   const paths = [
     path.join("/Library/Managed Preferences", user, `${MANAGED_PLIST_DOMAIN}.plist`),
     path.join("/Library/Managed Preferences", `${MANAGED_PLIST_DOMAIN}.plist`),