Add chmoding to the native agent

Summary:
The native agent is used on Lollipop and below devices. Despite documentation to the contrary, it also doesn't chmod files, but instead was relying on buck doing this through adb shell commands. When the optimization in D20242616 is turned on, this no longer happens, leading to crashes.

This diff fixes the crashes by adding chmod() calls into the native agent.

Reviewed By: IanChilds

shipit-source-id: 6cd75318a5df9d30f80daf6a171017ad9f1f9e4c

android/com/facebook/buck/android/agent/native/receive-file.c

@@ -22,6 +22,7 @@
 #include <poll.h>
 #include <sys/time.h>
 #include <sys/socket.h>
+#include <sys/stat.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
 
@@ -329,6 +330,12 @@ static int raw_receive_file(const char* path, int expected_size, int sock) {
     goto error;
   }
 
+  ret = chmod(path, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH );
+  if (ret != 0) {
+    perror("chmod");
+    goto error;
+  }
+
   return 0;
 
 error:

src/com/facebook/buck/android/agent/util/AgentUtil.java

@@ -33,7 +33,7 @@ private AgentUtil() {}
 
   // These must match the values in the agent manifest.
   public static final String AGENT_PACKAGE_NAME = "com.facebook.buck.android.agent";
-  public static final String AGENT_VERSION_CODE = "10";
+  public static final String AGENT_VERSION_CODE = "11";
 
   /** Size in bytes of the binary data use to generate the secret key for receive-file. */
   public static final int BINARY_SECRET_KEY_SIZE = 16;