[gparted] Resolve real path for symbolic link devices in mount files (#582687)

[Curtis Gedak <gedakc src gnome org>]

commit 6d90d0fbcd75bec938d63bd4fb6ba585a51dcb05
Author: Curtis Gedak <gedakc gmail com>
Date:   Sun Aug 9 14:26:07 2009 -0600

    Resolve real path for symbolic link devices in mount files (#582687)
    
    In order to find a match between the device paths in mount files and
    partitions as found by libparted, the mount device must be a real path
    and not a symbolic link.
    
    Closes GParted bug #582687

 src/GParted_Core.cc |   17 +++++++++++------
 1 files changed, 11 insertions(+), 6 deletions(-)
---
diff --git a/src/GParted_Core.cc b/src/GParted_Core.cc
index e194fec..5799f8b 100644
--- a/src/GParted_Core.cc
+++ b/src/GParted_Core.cc
@@ -644,16 +644,21 @@ void GParted_Core::read_mountpoints_from_file(
 		{
 			node       = Utils::regexp_label( line, "^(/[^ \t]+)[ \t]+[^ \t]+" ) ;
 			mountpoint = Utils::regexp_label( line, "^/[^ \t]+[ \t]+([^ \t]+)" ) ;
-			if ( mountpoint .length() > 0 &&
-			     node .length() > 0 &&
-			     node != "/dev/root" )
+			if ( mountpoint .length() > 0 && node .length() > 0 )
 			{
+				//If node is a symbolic link (e.g., /dev/root), then find real path
+				if ( file_test( node, Glib::FILE_TEST_IS_SYMLINK ) )
+				{
+					char c_str[4096+1] ;
+					Glib::ustring tmp_node = node ;
+					//FIXME: it seems realpath is very unsafe to use (manpage)...
+					realpath( tmp_node .c_str(), c_str ) ;
+					if ( tmp_node .length() > 0 )
+						node = tmp_node ;
+				}
 				//only add this path if it exists
 				if ( file_test( mountpoint, Glib::FILE_TEST_EXISTS ) )
-				{
 					map[ node ] .push_back( mountpoint ) ;
-					//FIXME:  Should check if file is a symbolic link.  If so then find real path
-				}
 			}
 		}