libsaria: Find library id from inode number

I want to eventually use this to create a library file for each library
path.  The "visible" field will be used to enable and disable different
paths during run time.

Signed-off-by: Bryan Schumaker <bjschuma@gmail.com>

include/libsaria/fs.h

@@ -1,9 +1,12 @@
 #ifndef LIBSARIA_FS_H
 #define LIBSARIA_FS_H
 
+#include <sys/types.h>
 #include <string>
 using namespace std;
 
+typedef ino_t sid_t;
+
 enum DataState {
 	DIRTY,
 	CLEAN,
@@ -11,6 +14,7 @@ enum DataState {
 
 namespace libsaria
 {
+	sid_t lookup_fileid(string &);
 
 	namespace app
 	{

include/libsaria/library.h

@@ -1,6 +1,8 @@
 #ifndef LIBSARIA_LIBRARY_H
 #define LIBSARIA_LIBRARY_H
 
+#include <libsaria/fs.h>
+
 #include <string>
 using namespace std;
 
@@ -11,6 +13,8 @@ namespace libsaria
 	{
 
 		struct Path {
+			bool visible;
+			sid_t lib_id;
 			string path;
 		};
 

libsaria/fs.cpp

@@ -20,6 +20,15 @@ static void make_dir(string path)
 namespace libsaria
 {
 
+	sid_t lookup_fileid(string &filepath)
+	{
+		struct stat stat;
+		int err = lstat(filepath.c_str(), &stat);
+		if (err != 0)
+			return err;
+		return stat.st_ino;
+	}
+
 	void app::mkdir()
 	{
 		make_dir(appdir.c_str());

libsaria/library/library.cpp

@@ -83,7 +83,13 @@ namespace libsaria
 	void library::Driver::add_path(string dir)
 	{
 		struct Path path;
+		path.visible = true;
+		path.lib_id = lookup_fileid(dir);
 		path.path = dir;
+
+		if (path.lib_id < 0)
+			return;
+
 		path_list.push_back(path);
 		path_added(&path);
 	}