pkg/bisect: switch to kconfig.Minimize

Use the new kconfig.Minimize for config minization
instead of the config-bisect.pl script.
This is mostly just deleting code.

Also update tests:
 - minimization is now supposed to test the baseline config
   (update "testos" stub accordingly)
 - minimization is not supposed to return a config that does not build
   (a reasonable config minimization procedure can't arrive to such config),
   remove test that tests this

Update #2171

1 files changed, 0 insertions, 120 deletions

diff --git a/pkg/vcs/linux_test.go b/pkg/vcs/linux_test.go
deleted file mode 100644
index c2bfd17e0..000000000
--- a/pkg/vcs/linux_test.go
+++ /dev/null
@@ -1,120 +0,0 @@
-// Copyright 2019 syzkaller project authors. All rights reserved.
-// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
-
-package vcs
-
-import (
-	"bytes"
-	"fmt"
-	"io/ioutil"
-	"os"
-	"runtime"
-	"strings"
-	"testing"
-
-	"github.com/google/syzkaller/pkg/osutil"
-)
-
-type MinimizationTest struct {
-	config         string
-	baselineConfig string
-	// Output contains expected config option.
-	expectedConfig string
-	// Minimization is expected to pass or fail.
-	passing bool
-}
-
-func TestConfigMinimizer(t *testing.T) {
-	if runtime.GOOS != "linux" {
-		// The test config-bisect.pl uses bash-isms and can't run on OS that don't have bash.
-		t.Skipf("skipping on non-linux")
-	}
-	t.Parallel()
-	tests := []MinimizationTest{
-		{
-			config:         "CONFIG_ORIGINAL=y",
-			baselineConfig: "CONFIG_FAILING=y",
-			expectedConfig: "CONFIG_ORIGINAL=y",
-			passing:        false,
-		},
-		{
-			config:         "CONFIG_ORIGINAL=y",
-			baselineConfig: "CONFIG_REPRODUCES_CRASH=y",
-			expectedConfig: "CONFIG_REPRODUCES_CRASH=y",
-			passing:        true,
-		},
-		{
-			config:         configBisectTag,
-			baselineConfig: "CONFIG_NOT_REPRODUCE_CRASH=y",
-			expectedConfig: configBisectTag,
-			passing:        true,
-		},
-	}
-
-	baseDir := createTestLinuxRepo(t)
-	repo, err := NewRepo("linux", "64", baseDir)
-	if err != nil {
-		t.Fatalf("Unable to create repository")
-	}
-	pred := func(test []byte) (BisectResult, error) {
-		if strings.Contains(string(test), "CONFIG_REPRODUCES_CRASH=y") {
-			return BisectBad, nil
-		}
-		return BisectGood, nil
-	}
-
-	minimizer, ok := repo.(ConfigMinimizer)
-	if !ok {
-		t.Fatalf("Config minimization is not implemented")
-	}
-	for i, test := range tests {
-		t.Run(fmt.Sprint(i), func(t *testing.T) {
-			trace := new(bytes.Buffer)
-			outConfig, err := minimizer.Minimize([]byte(test.config),
-				[]byte(test.baselineConfig), trace, pred)
-			t.Log(trace.String())
-			if test.passing && err != nil {
-				t.Fatalf("failed to run Minimize: %v", err)
-			} else if test.passing && !strings.Contains(string(outConfig),
-				test.expectedConfig) {
-				t.Fatalf("output is not expected %v vs. %v", string(outConfig),
-					test.expectedConfig)
-			}
-		})
-	}
-}
-
-func createTestLinuxRepo(t *testing.T) string {
-	baseDir, err := ioutil.TempDir("", "syz-config-bisect-test")
-	if err != nil {
-		t.Fatal(err)
-	}
-	repo := CreateTestRepo(t, baseDir, "")
-	if !repo.SupportsBisection() {
-		t.Skip("bisection is unsupported by git (probably too old version)")
-	}
-	repo.CommitChange("commit")
-	repo.SetTag("v4.1")
-	err = os.MkdirAll(baseDir+"/tools/testing/ktest", 0755)
-	if err != nil {
-		t.Fatal(err)
-	}
-	err = os.MkdirAll(baseDir+"/scripts/kconfig", 0755)
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	// Copy stubbed scripts used by config bisect.
-	err = osutil.CopyFile("testdata/linux/config-bisect.pl",
-		baseDir+"/tools/testing/ktest/config-bisect.pl")
-	if err != nil {
-		t.Fatal(err)
-	}
-	err = osutil.CopyFile("testdata/linux/merge_config.sh",
-		baseDir+"/scripts/kconfig/merge_config.sh")
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	return baseDir
-}