Add and set read-only mount flag in the Partition object (#10)

Set the partition read-only mount flag at the same time as setting the
file system mount points.

Closes #10 - Gparted fails to resize btrfs partition that is mounted
             read-only

include/Mount_Info.h

@@ -49,6 +49,8 @@ public:
 	static void load_cache();
 	static bool is_dev_mounted( const Glib::ustring & path );
 	static bool is_dev_mounted( const BlockSpecial & bs );
+	static bool is_dev_mounted_readonly( const Glib::ustring & path );
+	static bool is_dev_mounted_readonly( const BlockSpecial & bs );
 	static std::vector<Glib::ustring> get_all_mountpoints();
 	static const std::vector<Glib::ustring> & get_mounted_mountpoints( const Glib::ustring & path );
 	static const std::vector<Glib::ustring> & get_fstab_mountpoints( const Glib::ustring & path );

include/Partition.h

@@ -165,6 +165,7 @@ public:
 	Sector significant_threshold;  //Threshold from intrinsic to significant unallocated sectors
 	bool inside_extended;
 	bool busy;
+	bool fs_readonly;  // Is the file system mounted read-only?
 	std::vector<Glib::ustring> flags ;
 
 	PartitionVector logicals;

src/GParted_Core.cc

@@ -1673,6 +1673,7 @@ bool GParted_Core::set_mountpoints_helper( Partition & partition, const Glib::us
 	if ( mountpoints.size() )
 	{
 		partition.add_mountpoints( mountpoints );
+		partition.fs_readonly = Mount_Info::is_dev_mounted_readonly( search_path );
 		return true ;
 	}
 

src/Mount_Info.cc

@@ -93,6 +93,21 @@ bool Mount_Info::is_dev_mounted( const BlockSpecial & bs )
 	return iter_mp != mount_info.end();
 }
 
+// Return whether the device path, such as /dev/sda3, is mounted read-only or not
+bool Mount_Info::is_dev_mounted_readonly( const Glib::ustring & path )
+{
+	return is_dev_mounted_readonly( BlockSpecial( path ) );
+}
+
+// Return whether the BlockSpecial object, such as {"/dev/sda3", 8, 3}, is mounted read-only or not
+bool Mount_Info::is_dev_mounted_readonly( const BlockSpecial & bs )
+{
+	MountMapping::const_iterator iter_mp = mount_info.find( bs );
+	if ( iter_mp == mount_info.end() )
+		return false;
+	return iter_mp->second.readonly;
+}
+
 std::vector<Glib::ustring> Mount_Info::get_all_mountpoints()
 {
 	MountMapping::const_iterator iter_mp;

src/Partition.cc

@@ -52,6 +52,7 @@ void Partition::Reset()
 	sector_size = 0 ;
 	fs_block_size = -1;
 	inside_extended = busy = strict_start = false ;
+	fs_readonly = false;
 	logicals .clear() ;
 	flags .clear() ;
 	mountpoints .clear() ;