[PATCH 2/2] ktest: run make mrproper not only for OUTPUT_DIR but also for BUILD_DIR to avoid build failure

[Satoru Takeuchi <satoru.takeuchi@gmail.com>]

From: Satoru Takeuchi <satoru.takeuchi@gmail.com>

Build failure hapens with the following log if BUILD_DIR is dirty.

===============================================================================
...
RUNNING TEST 1 of 1 with option build olddefconfig

make O=/home/sat/ktest/output mrproper ...   CLEAN   arch/x86/tools
  CLEAN   scripts/basic
  CLEAN   scripts/kconfig
  CLEAN   include/config include/generated arch/x86/include/generated
  CLEAN   .config.old include/generated/uapi/linux/version.h
SUCCESS
...
make O=/home/sat/ktest/output -j8 ...   GEN     /home/sat/ktest/output/Makefile
...
  Using /home/sat/src/test-linux-stable/linux-stable as source for kernel
  /home/sat/src/test-linux-stable/linux-stable is not clean, please run 'make mrproper'
  in the '/home/sat/src/test-linux-stable/linux-stable' directory.
make[1]: *** [prepare3] Error 1
make[1]: *** Waiting for unfinished jobs....
  HOSTLD  arch/x86/tools/relocs
make[1]: *** wait: No child processes.  Stop.
make: *** [sub-make] Error 2
FAILED!
CRITICAL FAILURE... failed build
===============================================================================

To avoid this problem, it's necessary to run make mrproper not only
for OUTPUT_DIR, but also for BUILD_DIR.

Signed-off-by: Satoru Takeuchi <satoru.takeuchi@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>

---
 tools/testing/ktest/ktest.pl | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/tools/testing/ktest/ktest.pl b/tools/testing/ktest/ktest.pl
index f731ef6..1169b2a 100755
--- a/tools/testing/ktest/ktest.pl
+++ b/tools/testing/ktest/ktest.pl
@@ -120,6 +120,7 @@ my $syslinux;
 my $syslinux_path;
 my $syslinux_label;
 my $target;
+my $makecmd;
 my $make;
 my $pre_install;
 my $post_install;
@@ -2198,6 +2199,11 @@ sub load_force_config {
     close IN;
 }
 
+sub mrproper {
+    run_command "$makecmd mrproper" or dodie "make mrproper for $builddir";
+    run_command "$make mrproper" or dodie "make mrproper for $outputdir";
+}
+
 sub build {
     my ($type) = @_;
 
@@ -2235,17 +2241,13 @@ sub build {
 	if (!$noclean) {
 	    run_command "mv $output_config $outputdir/config_temp" or
 		dodie "moving .config";
-
-	    run_command "$make mrproper" or dodie "make mrproper";
-
+	    mrproper;
 	    run_command "mv $outputdir/config_temp $output_config" or
 		dodie "moving config_temp";
 	}
-
     } elsif (!$noclean) {
 	unlink "$output_config";
-	run_command "$make mrproper" or
-	    dodie "make mrproper";
+	mrproper;
     }
 
     # add something to distinguish this build
@@ -3996,7 +3998,7 @@ for (my $i = 1; $i <= $opt{"NUM_TESTS"}; $i++) {
 
     undef %force_config;
 
-    my $makecmd = set_test_option("MAKE_CMD", $i);
+    $makecmd = set_test_option("MAKE_CMD", $i);
 
     $outputdir = set_test_option("OUTPUT_DIR", $i);
     $builddir = set_test_option("BUILD_DIR", $i);
-- 
1.8.5.3