[gparted] Replace use of deprecated btrfsck (!26)

[Curtis Gedak <gedakc src gnome org>]

commit 05d9919afac1a94fe063022979b0408d0d036a3f
Author: Mike Fleetwood <mike fleetwood googlemail com>
Date:   Mon Mar 11 21:52:38 2019 +0000

    Replace use of deprecated btrfsck (!26)
    
    In btrfs-progs 3.12, btrfsck is a hard link to the multi-tool btrfs
    executable.  When run as 'btrfsck' it just implements 'btrfs check'
    [1][2][3][4].
    
    In btrfs-progs 3.14.2 the btrfsck man page is re-added as a symlink to
    the btrfs-check man page and reports that btrfsck is deprecated [5].
    
    Therefore replace use of 'btrfsck' with 'btrfs check'.
    
    [1] 
https://git.kernel.org/pub/scm/linux/kernel/git/kdave/btrfs-progs.git/commit/?id=fac45410e9a783c187ae83d993d3bf3350d05149
        Btrfs-progs: Rename btrfsck.c -> cmds-check.c
    
    [2] 
https://git.kernel.org/pub/scm/linux/kernel/git/kdave/btrfs-progs.git/commit/?id=5956f752c66d5259bbb17a2dd47ee8c8cc0e5f4f
        Btrfs-progs: add btrfsck functionality to btrfs
    
    [3] 
https://git.kernel.org/pub/scm/linux/kernel/git/kdave/btrfs-progs.git/commit/?id=d5d2046ae3b216af22a8a37c940f2412ba519b6e
        Btrfs-progs: add btrfsck name detection to btrfs
    
    [4] 
https://git.kernel.org/pub/scm/linux/kernel/git/kdave/btrfs-progs.git/commit/?id=e31f6172aa1d6ec5d562f56086819a0f4bc8a914
        btrfs-progs: build btrsfck to keep compatibility
    
    [5] 
https://git.kernel.org/pub/scm/linux/kernel/git/kdave/btrfs-progs.git/commit/?id=fddeecb7d424d5bb1a93a19a5e537057a4a7f597
        btrfs-progs: doc: link btrfsck to btrfs-check
    
    Closes !26 - Remove support for btrfs-progs < 3.12

 src/btrfs.cc | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)
---
diff --git a/src/btrfs.cc b/src/btrfs.cc
index 5e679ec3..fd4c77d7 100644
--- a/src/btrfs.cc
+++ b/src/btrfs.cc
@@ -51,18 +51,19 @@ FS btrfs::get_filesystem_support()
                fs.create_with_label = FS::EXTERNAL;
        }
 
-       if ( ! Glib::find_program_in_path( "btrfsck" ) .empty() )
-               fs.check = FS::EXTERNAL;
-
        if (! Glib::find_program_in_path("btrfs").empty())
        {
-               //Use newer btrfs multi-tool control command.  No need
-               //  to test for filesystem show and filesystem resize
-               //  sub-commands as they were always included.
+               // Use these btrfs multi-tool sub-commands without further checking for
+               // their availability:
+               //     btrfs check
+               //     btrfs filesystem resize
+               //     btrfs filesystem show
+               // as they are all available in btrfs-progs >= 3.12.
 
                fs.read = FS::EXTERNAL;
                fs .read_label = FS::EXTERNAL ;
                fs .read_uuid = FS::EXTERNAL ;
+               fs.check = FS::EXTERNAL;
 
                //Resizing of btrfs requires mount, umount and kernel
                //  support as well as btrfs filesystem resize
@@ -131,8 +132,8 @@ bool btrfs::create( const Partition & new_partition, OperationDetail & operation
 
 bool btrfs::check_repair( const Partition & partition, OperationDetail & operationdetail )
 {
-       return ! execute_command( "btrfsck " + Glib::shell_quote( partition.get_path() ),
-                                 operationdetail, EXEC_CHECK_STATUS );
+       return ! execute_command("btrfs check " + Glib::shell_quote(partition.get_path()),
+                                operationdetail, EXEC_CHECK_STATUS);
 }
 
 void btrfs::set_used_sectors( Partition & partition )