From e5442c96ae955e0ee8e9accdbc69710c36eb441a Mon Sep 17 00:00:00 2001
From: Jason Simmons <jason-simmons@users.noreply.github.com>
Date: Fri, 24 Feb 2017 09:44:36 -0800
Subject: [PATCH] Return an error to Dart when spawning an isolate with an
 unsupported URI (#3443)

Fixes https://github.com/flutter/flutter/issues/8084
---
 runtime/dart_init.cc | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/runtime/dart_init.cc b/runtime/dart_init.cc
index 0e940db40..e4f314027 100644
--- a/runtime/dart_init.cc
+++ b/runtime/dart_init.cc
@@ -261,8 +261,11 @@ Dart_Isolate IsolateCreateCallback(const char* script_uri,
   std::vector<uint8_t> snapshot_data;
   std::string entry_path;
   if (!IsRunningPrecompiledCode()) {
-    // Assert that entry script URI starts with file://
-    FTL_CHECK(entry_uri.find(kFileUriPrefix) == 0u);
+    // Check that the entry script URI starts with file://
+    if (entry_uri.find(kFileUriPrefix) != 0u) {
+      *error = strdup("Isolates must use file:// URIs");
+      return nullptr;
+    }
     // Entry script path (file:// is stripped).
     entry_path = std::string(script_uri + strlen(kFileUriPrefix));
     if (!running_from_source) {
-- 
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