tcwg_kernel-build.sh: Fill in no_regression_p and check_regression.

Change-Id: I1725a201a7665d8728180bf021050e8c1c1378f7

1 files changed, 49 insertions, 0 deletions

diff --git a/tcwg_kernel-build.sh b/tcwg_kernel-build.sh
index fe217607..1ace57c3 100755
--- a/tcwg_kernel-build.sh
+++ b/tcwg_kernel-build.sh
@@ -471,12 +471,61 @@ count_linux_objs ()
     )
 }
 
+# Exit with code 0 if no regression compared to base-artifacts/results.
 no_regression_p ()
 {
+    (
+    set -euf -o pipefail
+
+    local linux_n_obj
+    linux_n_obj=$(tail -n1 $top_artifacts/results)
+
+    if [ x"$linux_n_obj" = x"all" ]; then
+	# Ideal result, no need to compare to baseline.
+	return 0
+    fi
+
+    if ! [ "$linux_n_obj" -ge "-3" ]; then
+	# Something is very wrong with result (e.g., it's not a number).
+	return 1
+    fi
+
+    # Assume worst for non-existent baseline.
+    local base_linux_n_obj="-3"
+
+    if [ -f base-artifacts/results ]; then
+	base_linux_n_obj=$(tail -n1 base-artifacts/results)
+	if [ x"$base_linux_n_obj" = x"all" ]; then
+	    # Current build is not ideal, so make sure baseline "all" is
+	    # better than the current result.
+	    base_linux_n_obj=$(($linux_n_obj+1))
+	elif ! [ "$base_linux_n_obj" -ge "-3" ]; then
+	    # Something is very wrong with baseline result
+	    # (e.g., it's not a number).
+	    return 0
+	fi
+    fi
+
+    if [ $linux_n_obj -ge $base_linux_n_obj ]; then
+	return 0
+    else
+	return 1
+    fi
+    )
 }
 
+# Check if current build regressed compared to the baseline
+# (unless $reset_baseline is set).
 check_regression ()
 {
+    (
+    set -euf -o pipefail
+
+    if ! $reset_baseline && ! no_regression_p; then
+	# Fail.
+	false
+    fi
+    )
 }
 
 update_baseline ()