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// Copyright 2022 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 build
import (
"fmt"
"io/ioutil"
"os"
"path/filepath"
"time"
"golang.org/x/sys/unix"
"github.com/google/syzkaller/pkg/osutil"
)
// buildCuttlefishImage mounts a disk image, fetches and installs a Cuttlefish emulator binary,
// and copies in the required kernel artifacts.
func buildCuttlefishImage(params Params, bzImage, vmlinux, initramfs string) error {
tempDir, err := ioutil.TempDir("", "syz-build")
if err != nil {
return err
}
defer os.RemoveAll(tempDir)
imageFile := filepath.Join(tempDir, "image")
if err := osutil.CopyFile(params.UserspaceDir, imageFile); err != nil {
return err
}
loop, loopFile, err := linuxSetupLoop(imageFile)
if err != nil {
return err
}
defer func() {
unix.IoctlGetInt(loop, unix.LOOP_CLR_FD)
unix.Close(loop)
}()
mountDir := filepath.Join(tempDir, "mnt")
if err := osutil.MkdirAll(mountDir); err != nil {
return err
}
if err := tryMount(loopFile+"p1", mountDir); err != nil {
return fmt.Errorf("mount(%vp1, %v) failed: %v", loopFile, mountDir, err)
}
defer unix.Unmount(mountDir, 0)
imageHomeDir := filepath.Join(mountDir, "root")
if _, err := osutil.RunCmd(time.Hour, imageHomeDir, "./fetchcvd"); err != nil {
return fmt.Errorf("run fetch_cvd: %s", err)
}
if err := osutil.CopyFile(bzImage, filepath.Join(imageHomeDir, "bzImage")); err != nil {
return err
}
if err := osutil.CopyFile(vmlinux, filepath.Join(imageHomeDir, "vmlinux")); err != nil {
return err
}
if err := osutil.CopyFile(initramfs, filepath.Join(imageHomeDir, "initramfs.img")); err != nil {
return err
}
if err := unix.Unmount(mountDir, 0); err != nil {
return err
}
return osutil.CopyFile(imageFile, filepath.Join(params.OutputDir, "image"))
}
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