Implement FuseBlockDataProvider
Adds a fuse data provider that parses the metadata from a block map,
reads the data from the given ranges of the block device; and provides
the data to the fuse.
Bug: 127071893
Test: unit tests pass, install a package from block map
Change-Id: Ie9925ee9144e98642505b3f5e1a4a186d2b21ed0
diff --git a/tests/unit/fuse_provider_test.cpp b/tests/unit/fuse_provider_test.cpp
new file mode 100644
index 0000000..c5995dd
--- /dev/null
+++ b/tests/unit/fuse_provider_test.cpp
@@ -0,0 +1,103 @@
+/*
+ * 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 <stdint.h>
+#include <unistd.h>
+
+#include <functional>
+#include <string>
+#include <vector>
+
+#include <android-base/file.h>
+#include <android-base/logging.h>
+#include <android-base/strings.h>
+#include <android-base/unique_fd.h>
+#include <gtest/gtest.h>
+
+#include "fuse_provider.h"
+#include "fuse_sideload.h"
+#include "install/install.h"
+
+TEST(FuseBlockMapTest, CreateFromBlockMap_smoke) {
+ TemporaryFile fake_block_device;
+ std::vector<std::string> lines = {
+ fake_block_device.path, "10000 4096", "3", "10 11", "20 21", "22 23",
+ };
+
+ TemporaryFile temp_file;
+ android::base::WriteStringToFile(android::base::Join(lines, '\n'), temp_file.path);
+ auto block_map_data = FuseBlockDataProvider::CreateFromBlockMap(temp_file.path, 4096);
+
+ ASSERT_TRUE(block_map_data);
+ ASSERT_EQ(10000, block_map_data->file_size());
+ ASSERT_EQ(4096, block_map_data->fuse_block_size());
+ ASSERT_EQ(RangeSet({ { 10, 11 }, { 20, 21 }, { 22, 23 } }), block_map_data->ranges());
+}
+
+TEST(FuseBlockMapTest, ReadBlockAlignedData_smoke) {
+ std::string content;
+ content.reserve(40960);
+ for (char c = 0; c < 10; c++) {
+ content += std::string(4096, c);
+ }
+ TemporaryFile fake_block_device;
+ ASSERT_TRUE(android::base::WriteStringToFile(content, fake_block_device.path));
+
+ std::vector<std::string> lines = {
+ fake_block_device.path,
+ "20000 4096",
+ "1",
+ "0 5",
+ };
+ TemporaryFile temp_file;
+ android::base::WriteStringToFile(android::base::Join(lines, '\n'), temp_file.path);
+ auto block_map_data = FuseBlockDataProvider::CreateFromBlockMap(temp_file.path, 4096);
+
+ std::vector<uint8_t> result(2000);
+ ASSERT_TRUE(block_map_data->ReadBlockAlignedData(result.data(), 2000, 1));
+ ASSERT_EQ(std::vector<uint8_t>(content.begin() + 4096, content.begin() + 6096), result);
+
+ result.resize(20000);
+ ASSERT_TRUE(block_map_data->ReadBlockAlignedData(result.data(), 20000, 0));
+ ASSERT_EQ(std::vector<uint8_t>(content.begin(), content.begin() + 20000), result);
+}
+
+TEST(FuseBlockMapTest, ReadBlockAlignedData_large_fuse_block) {
+ std::string content;
+ for (char c = 0; c < 10; c++) {
+ content += std::string(4096, c);
+ }
+
+ TemporaryFile temp_file;
+ ASSERT_TRUE(android::base::WriteStringToFile(content, temp_file.path));
+
+ std::vector<std::string> lines = {
+ temp_file.path, "36384 4096", "2", "0 5", "6 10",
+ };
+ TemporaryFile block_map;
+ ASSERT_TRUE(android::base::WriteStringToFile(android::base::Join(lines, '\n'), block_map.path));
+
+ auto block_map_data = FuseBlockDataProvider::CreateFromBlockMap(block_map.path, 16384);
+ ASSERT_TRUE(block_map_data);
+
+ std::vector<uint8_t> result(20000);
+ // Out of bound read
+ ASSERT_FALSE(block_map_data->ReadBlockAlignedData(result.data(), 20000, 2));
+ ASSERT_TRUE(block_map_data->ReadBlockAlignedData(result.data(), 20000, 1));
+ // expected source block contains: 4, 6-9
+ std::string expected = content.substr(16384, 4096) + content.substr(24576, 15904);
+ ASSERT_EQ(std::vector<uint8_t>(expected.begin(), expected.end()), result);
+}