ktest: introduce _get_grub_index

Introduce _get_grub_index() to deal with Boot Loader
Specification (BLS) and cleanup.

Link: http://lkml.kernel.org/r/20190509213647.6276-2-msys.mizuma@gmail.comSigned-off-by: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

tools/testing/ktest/ktest.pl

@@ -1871,6 +1871,43 @@ sub run_scp_mod {
     return run_scp($src, $dst, $cp_scp);
 }
 
+sub _get_grub_index {
+
+    my ($command, $target, $skip) = @_;
+
+    return if (defined($grub_number) && defined($last_grub_menu) &&
+	       $last_grub_menu eq $grub_menu && defined($last_machine) &&
+	       $last_machine eq $machine);
+
+    doprint "Find $reboot_type menu ... ";
+    $grub_number = -1;
+
+    my $ssh_grub = $ssh_exec;
+    $ssh_grub =~ s,\$SSH_COMMAND,$command,g;
+
+    open(IN, "$ssh_grub |")
+	or dodie "unable to execute $command";
+
+    my $found = 0;
+
+    while (<IN>) {
+	if (/$target/) {
+	    $grub_number++;
+	    $found = 1;
+	    last;
+	} elsif (/$skip/) {
+	    $grub_number++;
+	}
+    }
+    close(IN);
+
+    dodie "Could not find '$grub_menu' through $command on $machine"
+	if (!$found);
+    doprint "$grub_number\n";
+    $last_grub_menu = $grub_menu;
+    $last_machine = $machine;
+}
+
 sub get_grub2_index {
 
     return if (defined($grub_number) && defined($last_grub_menu) &&