Rename CacheLocation to Paths.

We have a general need for overriding more paths (e.g. "/tmp"), mostly
for testing purpose. Rename CacheLocation to Paths, and use that to
manage TEMPORARY_{INSTALL,LOG}_FILE.

Test: mmma -j bootable/recovery
Test: recovery_component_test
Change-Id: Ia8ce8e5695df37ca434f13ac4d3206de1e8e9396
diff --git a/otautil/paths.cpp b/otautil/paths.cpp
new file mode 100644
index 0000000..ad9ec11
--- /dev/null
+++ b/otautil/paths.cpp
@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2018 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 "otautil/paths.h"
+
+constexpr const char kDefaultCacheLogDirectory[] = "/cache/recovery";
+constexpr const char kDefaultCacheTempSource[] = "/cache/saved.file";
+constexpr const char kDefaultLastCommandFile[] = "/cache/recovery/last_command";
+constexpr const char kDefaultStashDirectoryBase[] = "/cache/recovery";
+constexpr const char kDefaultTemporaryInstallFile[] = "/tmp/last_install";
+constexpr const char kDefaultTemporaryLogFile[] = "/tmp/recovery.log";
+
+Paths& Paths::Get() {
+  static Paths paths;
+  return paths;
+}
+
+Paths::Paths()
+    : cache_log_directory_(kDefaultCacheLogDirectory),
+      cache_temp_source_(kDefaultCacheTempSource),
+      last_command_file_(kDefaultLastCommandFile),
+      stash_directory_base_(kDefaultStashDirectoryBase),
+      temporary_install_file_(kDefaultTemporaryInstallFile),
+      temporary_log_file_(kDefaultTemporaryLogFile) {}