pkg/build: move from pkg/kernel

Rename pkg/kernel to pkg/build and prepare for multi-OS support.

1 files changed, 0 insertions, 164 deletions

diff --git a/pkg/kernel/kernel.go b/pkg/kernel/kernel.go
deleted file mode 100644
index 5bcc0fc42..000000000
--- a/pkg/kernel/kernel.go
+++ /dev/null
@@ -1,164 +0,0 @@
-// Copyright 2017 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.
-
-//go:generate bash -c "echo -en '// AUTOGENERATED FILE\n\n' > generated.go"
-//go:generate bash -c "echo -en 'package kernel\n\n' >> generated.go"
-//go:generate bash -c "echo -en 'const createImageScript = `#!/bin/bash\n' >> generated.go"
-//go:generate bash -c "cat ../../tools/create-gce-image.sh | grep -v '#' >> generated.go"
-//go:generate bash -c "echo -en '`\n\n' >> generated.go"
-
-// Package kernel contains helper functions for working with Linux kernel
-// (building kernel/image).
-package kernel
-
-import (
-	"bytes"
-	"fmt"
-	"io/ioutil"
-	"os"
-	"path/filepath"
-	"runtime"
-	"strconv"
-	"strings"
-	"time"
-
-	"github.com/google/syzkaller/pkg/osutil"
-)
-
-func Build(dir, compiler string, config []byte) error {
-	configFile := filepath.Join(dir, ".config")
-	if err := osutil.WriteFile(configFile, config); err != nil {
-		return fmt.Errorf("failed to write config file: %v", err)
-	}
-	if err := osutil.SandboxChown(configFile); err != nil {
-		return err
-	}
-	// One would expect olddefconfig here, but olddefconfig is not present in v3.6 and below.
-	// oldconfig is the same as olddefconfig if stdin is not set.
-	// Note: passing in compiler is important since 4.17 (at the very least it's noted in the config).
-	cmd := osutil.Command("make", "oldconfig", "CC="+compiler)
-	if err := osutil.Sandbox(cmd, true, true); err != nil {
-		return err
-	}
-	cmd.Dir = dir
-	if _, err := osutil.Run(10*time.Minute, cmd); err != nil {
-		return err
-	}
-	// We build only bzImage as we currently don't use modules.
-	cpu := strconv.Itoa(runtime.NumCPU())
-	cmd = osutil.Command("make", "bzImage", "-j", cpu, "CC="+compiler)
-	if err := osutil.Sandbox(cmd, true, true); err != nil {
-		return err
-	}
-	cmd.Dir = dir
-	// Build of a large kernel can take a while on a 1 CPU VM.
-	if _, err := osutil.Run(3*time.Hour, cmd); err != nil {
-		return extractRootCause(err)
-	}
-	return nil
-}
-
-func Clean(dir string) error {
-	cpu := strconv.Itoa(runtime.NumCPU())
-	cmd := osutil.Command("make", "distclean", "-j", cpu)
-	if err := osutil.Sandbox(cmd, true, true); err != nil {
-		return err
-	}
-	cmd.Dir = dir
-	_, err := osutil.Run(10*time.Minute, cmd)
-	return err
-}
-
-// CreateImage creates a disk image that is suitable for syzkaller.
-// Kernel is taken from kernelDir, userspace system is taken from userspaceDir.
-// If cmdlineFile is not empty, contents of the file are appended to the kernel command line.
-// If sysctlFile is not empty, contents of the file are appended to the image /etc/sysctl.conf.
-// Produces image and root ssh key in the specified files.
-func CreateImage(targetOS, targetArch, vmType, kernelDir, userspaceDir, cmdlineFile, sysctlFile,
-	image, sshkey string) error {
-	if targetOS != "linux" || targetArch != "amd64" {
-		return fmt.Errorf("only linux/amd64 is supported")
-	}
-	if vmType != "qemu" && vmType != "gce" {
-		return fmt.Errorf("images can be built only for qemu/gce machines")
-	}
-	tempDir, err := ioutil.TempDir("", "syz-build")
-	if err != nil {
-		return err
-	}
-	defer os.RemoveAll(tempDir)
-	scriptFile := filepath.Join(tempDir, "create.sh")
-	if err := osutil.WriteExecFile(scriptFile, []byte(createImageScript)); err != nil {
-		return fmt.Errorf("failed to write script file: %v", err)
-	}
-	bzImage := filepath.Join(kernelDir, filepath.FromSlash("arch/x86/boot/bzImage"))
-	cmd := osutil.Command(scriptFile, userspaceDir, bzImage)
-	cmd.Dir = tempDir
-	cmd.Env = append([]string{}, os.Environ()...)
-	cmd.Env = append(cmd.Env,
-		"SYZ_VM_TYPE="+vmType,
-		"SYZ_CMDLINE_FILE="+osutil.Abs(cmdlineFile),
-		"SYZ_SYSCTL_FILE="+osutil.Abs(sysctlFile),
-	)
-	if _, err = osutil.Run(time.Hour, cmd); err != nil {
-		return fmt.Errorf("image build failed: %v", err)
-	}
-	// Note: we use CopyFile instead of Rename because src and dst can be on different filesystems.
-	if err := osutil.CopyFile(filepath.Join(tempDir, "disk.raw"), image); err != nil {
-		return err
-	}
-	if err := osutil.CopyFile(filepath.Join(tempDir, "key"), sshkey); err != nil {
-		return err
-	}
-	if err := os.Chmod(sshkey, 0600); err != nil {
-		return err
-	}
-	return nil
-}
-
-func CompilerIdentity(compiler string) (string, error) {
-	output, err := osutil.RunCmd(time.Minute, "", compiler, "--version")
-	if err != nil {
-		return "", err
-	}
-	if len(output) == 0 {
-		return "", fmt.Errorf("no output from compiler --version")
-	}
-	return strings.Split(string(output), "\n")[0], nil
-}
-
-func extractRootCause(err error) error {
-	verr, ok := err.(*osutil.VerboseError)
-	if !ok {
-		return err
-	}
-	var cause []byte
-	for _, line := range bytes.Split(verr.Output, []byte{'\n'}) {
-		for _, pattern := range buildFailureCauses {
-			if pattern.weak && cause != nil {
-				continue
-			}
-			if bytes.Contains(line, pattern.pattern) {
-				cause = line
-				break
-			}
-		}
-	}
-	if cause != nil {
-		verr.Title = string(cause)
-	}
-	return verr
-}
-
-type buildFailureCause struct {
-	pattern []byte
-	weak    bool
-}
-
-var buildFailureCauses = [...]buildFailureCause{
-	{pattern: []byte(": error: ")},
-	{pattern: []byte(": fatal error: ")},
-	{pattern: []byte(": undefined reference to")},
-	{weak: true, pattern: []byte(": final link failed: ")},
-	{weak: true, pattern: []byte("collect2: error: ")},
-}