Fix issue with writing caches (#1122)

Author: Mikhail Arkhipov

src/Core/Impl/Extensions/IOExtensions.cs

@@ -124,9 +124,14 @@ public static string ReadTextWithRetry(this IFileSystem fs, string file) {
         public static void WriteTextWithRetry(this IFileSystem fs, string filePath, string text) {
             for (var retries = 100; retries > 0; --retries) {
                 try {
-                    fs.WriteAllText(filePath, text);
-                    return;
-                } catch (Exception ex) when (ex is IOException || ex is UnauthorizedAccessException) {
+                    using (var stream = fs.OpenWithRetry(filePath, FileMode.Create, FileAccess.Write, FileShare.Read)) {
+                        if (stream != null) {
+                            var bytes = Encoding.UTF8.GetBytes(text);
+                            stream.Write(bytes, 0, bytes.Length);
+                            return;
+                        }
+                    }
+                } catch (IOException) { } catch (UnauthorizedAccessException) {
                     Thread.Sleep(10);
                 }
             }