ktest: Add BISECT_SKIP

If a during a git bisect, ktest fails on something other than
what it is testing (if BISECT_TYPE is test but it fails on build),
if BISECT_SKIP is set, then it will do a "git bisect skip" instead
of just failing the bisect and letting the user find a good commit
to test.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

2 files changed, 37 insertions, 8 deletions

diff --git a/tools/testing/ktest/ktest.pl b/tools/testing/ktest/ktest.pl
index e55bd52367a..0f62916a43f 100755
--- a/tools/testing/ktest/ktest.pl
+++ b/tools/testing/ktest/ktest.pl
@@ -38,6 +38,7 @@ $default{"BUILD_OPTIONS"}	= "";
 $default{"BISECT_SLEEP_TIME"}   = 60;   # sleep time between bisects
 $default{"CLEAR_LOG"}           = 0;
 $default{"BISECT_MANUAL"}       = 0;
+$default{"BISECT_SKIP"}         = 1;
 $default{"SUCCESS_LINE"}        = "login:";
 $default{"BOOTED_TIMEOUT"}      = 1;
 $default{"DIE_ON_FAILURE"}      = 1;
@@ -83,6 +84,7 @@ my $in_bisect = 0;
 my $bisect_bad = "";
 my $reverse_bisect;
 my $bisect_manual;
+my $bisect_skip;
 my $in_patchcheck = 0;
 my $run_test;
 my $redirect;
@@ -1169,7 +1171,15 @@ sub run_git_bisect {
     return 1;
 }
 
-# returns 1 on success, 0 on failure
+sub bisect_reboot {
+    doprint "Reboot and sleep $bisect_sleep_time seconds\n";
+    reboot;
+    start_monitor;
+    wait_for_monitor $bisect_sleep_time;
+    end_monitor;
+}
+
+# returns 1 on success, 0 on failure, -1 on skip
 sub run_bisect_test {
     my ($type, $buildtype) = @_;
 
@@ -1183,6 +1193,10 @@ sub run_bisect_test {
     build $buildtype or $failed = 1;
 
     if ($type ne "build") {
+        if ($failed && $bisect_skip) {
+            $in_bisect = 0;
+            return -1;
+        }
         dodie "Failed on build" if $failed;
 
         # Now boot the box
@@ -1194,6 +1208,12 @@ sub run_bisect_test {
         monitor or $failed = 1;
 
         if ($type ne "boot") {
+            if ($failed && $bisect_skip) {
+                end_monitor;
+                bisect_reboot;
+                $in_bisect = 0;
+                return -1;
+            }
             dodie "Failed on boot" if $failed;
 
             do_run_test or $failed = 1;
@@ -1206,11 +1226,7 @@ sub run_bisect_test {
 
         # reboot the box to a good kernel
         if ($type ne "build") {
-            doprint "Reboot and sleep $bisect_sleep_time seconds\n";
-            reboot;
-            start_monitor;
-            wait_for_monitor $bisect_sleep_time;
-            end_monitor;
+            bisect_reboot;
         }
     } else {
         $result = 1;
@@ -1240,10 +1256,13 @@ sub run_bisect {
         $ret = !$ret;
     }
 
-    if ($ret) {
+    if ($ret > 0) {
         return "good";
-    } else {
+    } elsif ($ret == 0) {
         return  "bad";
+    } elsif ($bisect_skip) {
+        doprint "HIT A BAD COMMIT ... SKIPPING\n";
+        return "skip";
     }
 }
 
@@ -1954,6 +1973,7 @@ for (my $i = 1; $i <= $opt{"NUM_TESTS"}; $i++) {
     $sleep_time = set_test_option("SLEEP_TIME", $i);
     $bisect_sleep_time = set_test_option("BISECT_SLEEP_TIME", $i);
     $bisect_manual = set_test_option("BISECT_MANUAL", $i);
+    $bisect_skip = set_test_option("BISECT_SKIP", $i);
     $store_failures = set_test_option("STORE_FAILURES", $i);
     $timeout = set_test_option("TIMEOUT", $i);
     $booted_timeout = set_test_option("BOOTED_TIMEOUT", $i);
diff --git a/tools/testing/ktest/sample.conf b/tools/testing/ktest/sample.conf
index af82ac28977..4c46b7ef8e4 100644
--- a/tools/testing/ktest/sample.conf
+++ b/tools/testing/ktest/sample.conf
@@ -519,6 +519,15 @@
 #   git bisect good, git bisect bad, and running the git bisect replay
 #   if the BISECT_REPLAY is set.
 #
+# BISECT_SKIP = 1 (optional, default 0)
+#
+#   If BISECT_TYPE is set to test but the build fails, ktest will
+#   simply fail the test and end their. You could use BISECT_REPLAY
+#   and BISECT_START to resume after you found a new starting point,
+#   or you could set BISECT_SKIP to 1. If BISECT_SKIP is set to 1,
+#   when something other than the BISECT_TYPE fails, ktest.pl will
+#   run "git bisect skip" and try again.
+#
 # BISECT_REVERSE = 1 (optional, default 0)
 #
 #   In those strange instances where it was broken forever