Added source files initialization.

Now source files handling is delegated to functions defined
in `sourcefs.c` file. By encapsulating methods for managing
the underlying source files structure we ensure that all
code changes to the source file protection strategy will be
localized to `sourcefs.c` file.

Also changed Makefile to use more sane way of handling
options and build flags.

sources/main.c

@@ -16,6 +16,7 @@ static void *icfs_init(struct fuse_conn_info *conn, struct fuse_config *cfg) {
   (void)conn; /* Explicit way to tell we ignore these arguments. */
   (void)cfg;  /* This also silences the compiler warnings. */
 
+  source_init(mountpoint);
   return NULL;
 }
 

sources/sourcefs.c

@@ -0,0 +1,21 @@
+#define _GNU_SOURCE
+
+#include "sourcefs.h"
+
+#include <fcntl.h>
+
+static struct source_files_handle {
+  int root_fd;
+} handle;
+
+int source_init(const char *root_path) {
+  int root_fd = open(root_path, O_PATH);
+
+  if (root_fd == -1) {
+    return -1;
+  }
+
+  handle.root_fd = root_fd;
+
+  return 0;
+}

sources/sourcefs.h

@@ -0,0 +1,14 @@
+
+
+#ifndef SOURCEFS_H
+#define SOURCEFS_H
+
+/**
+ * Initializes the source file handling.
+ *
+ * @param root_path The root of the source files folder.
+ * @return 0 on success, 1 on failure.
+ */
+int source_init(const char *root_path);
+
+#endif // !SOURCEFS_H