Create a FuseDataProvider base class
The fuse data provider for adb/sdcard shares common code and structures.
This cl creates a FuseDataProvider base class and provides
implementations for adb and sdcard.
In the follow cls, we can kill the provider_vtab struct; and also add
another implementation to parse a block map file and provides data.
Test: unit tests pass, sideload a package, apply a package from sdcard
Change-Id: If8311666a52a2e3c0fbae0ee9688fa6d01e4ad09
diff --git a/fuse_sdcard_install.cpp b/fuse_sdcard_install.cpp
new file mode 100644
index 0000000..79ef16b
--- /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;
+}