split the cli and the core functionnalities

src/lib/overlayfs.h

@@ -0,0 +1,18 @@
+#ifndef __OVERLAY_H__
+#define __OVERLAY_H__
+
+typedef enum overlay_errors { SUCESS, NOT_INSTALLED, FAILURE } overlay_errors_t;
+
+
+/**
+ * @brief Overlayfs is what make it possible to deploy to the game files without altering anything.
+ * it allows us to overlay multiple folder over the game files. like appling filters to an image.
+ * @param sources a null ended table of folder that will overlay of the game files
+ * @param dest the overlayed folder(the game data folder)
+ * @param upperdir the director that will store the changed files
+ * @param workdir a directory that will contains only temporary files.
+ * @return int error code
+ */
+overlay_errors_t overlay_mount(char ** sources, const char * dest, const char * upperdir, const char * workdir);
+
+#endif