[gparted] Finish removal of btrfs-show (!26)

[Curtis Gedak <gedakc src gnome org>]

commit 3607ede307074b04337742df95a87edeaa36eb19
Author: Mike Fleetwood <mike fleetwood googlemail com>
Date:   Mon Mar 11 21:24:22 2019 +0000

    Finish removal of btrfs-show (!26)
    
    Remove use of btrfs-show from everywhere else in the btrfs module.
    
    Closes !26 - Remove support for btrfs-progs < 3.12

 src/btrfs.cc | 31 ++++++-------------------------
 1 file changed, 6 insertions(+), 25 deletions(-)
---
diff --git a/src/btrfs.cc b/src/btrfs.cc
index f9dbe9a0..fb4a1be0 100644
--- a/src/btrfs.cc
+++ b/src/btrfs.cc
@@ -86,15 +86,7 @@ FS btrfs::get_filesystem_support()
        }
        else
        {
-               //Fall back to using btrfs-show and btrfsctl, which
-               //  were depreciated October 2011
-
-               if ( ! Glib::find_program_in_path( "btrfs-show" ) .empty() )
-               {
-                       fs.read = FS::EXTERNAL;
-                       fs .read_label = FS::EXTERNAL ;
-                       fs .read_uuid = FS::EXTERNAL ;
-               }
+               // Fall back to using btrfsctl which was depreciated October 2011.
 
                //Resizing of btrfs requires btrfsctl, mount, umount
                //  and kernel support
@@ -216,12 +208,8 @@ void btrfs::set_used_sectors( Partition & partition )
        //     devices.
        //  4) Extents can be and are relocated to other devices within the file system
        //     when shrinking a device.
-       if ( btrfs_found )
-               Utils::execute_command( "btrfs filesystem show " + Glib::shell_quote( partition.get_path() ),
-                                       output, error, true );
-       else
-               Utils::execute_command( "btrfs-show " + Glib::shell_quote( partition.get_path() ),
-                                       output, error, true );
+       Utils::execute_command("btrfs filesystem show " + Glib::shell_quote(partition.get_path()),
+                              output, error, true);
        //In many cases the exit status doesn't reflect valid output or an error condition
        //  so rely on parsing the output to determine success.
 
@@ -391,12 +379,8 @@ void btrfs::read_label( Partition & partition )
 
 void btrfs::read_uuid( Partition & partition )
 {
-       if ( btrfs_found )
-               Utils::execute_command( "btrfs filesystem show " + Glib::shell_quote( partition.get_path() ),
-                                       output, error, true );
-       else
-               Utils::execute_command( "btrfs-show " + Glib::shell_quote( partition.get_path() ),
-                                       output, error, true );
+       Utils::execute_command("btrfs filesystem show " + Glib::shell_quote(partition.get_path()),
+                              output, error, true);
        //In many cases the exit status doesn't reflect valid output or an error condition
        //  so rely on parsing the output to determine success.
 
@@ -468,10 +452,7 @@ const BTRFS_Device & btrfs::get_cache_entry( const Glib::ustring & path )
        Glib::ustring output, error ;
        std::vector<int> devid_list ;
        std::vector<Glib::ustring> path_list ;
-       if ( btrfs_found )
-               Utils::execute_command( "btrfs filesystem show " + Glib::shell_quote( path ), output, error, 
true );
-       else
-               Utils::execute_command( "btrfs-show " + Glib::shell_quote( path ), output, error, true );
+       Utils::execute_command("btrfs filesystem show " + Glib::shell_quote(path), output, error, true);
        //In many cases the exit status doesn't reflect valid output or an error condition
        //  so rely on parsing the output to determine success.