1 files changed, 45 insertions, 0 deletions

diff --git a/fuse_sdcard_install.cpp b/fuse_sdcard_install.cpp
new file mode 100644
index 000000000..79ef16bbc
--- /dev/null
+++ b/fuse_sdcard_install.cpp
@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "fuse_sdcard_install.h"
+
+#include <sys/mount.h>
+#include <unistd.h>
+
+#include <functional>
+
+#include "fuse_provider.h"
+#include "fuse_sideload.h"
+
+bool start_sdcard_fuse(const char* path) {
+  FuseFileDataProvider file_data_reader(path, 65536);
+
+  if (!file_data_reader) {
+    return false;
+  }
+
+  provider_vtab vtab;
+  vtab.read_block = std::bind(&FuseFileDataProvider::ReadBlockAlignedData, &file_data_reader,
+                              std::placeholders::_2, std::placeholders::_3, std::placeholders::_1);
+  vtab.close = [&file_data_reader]() { file_data_reader.Close(); };
+
+  // The installation process expects to find the sdcard unmounted. Unmount it with MNT_DETACH so
+  // that our open file continues to work but new references see it as unmounted.
+  umount2("/sdcard", MNT_DETACH);
+
+  return run_fuse_sideload(vtab, file_data_reader.file_size(),
+                           file_data_reader.fuse_block_size()) == 0;
+}