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// Copyright 2024 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 image
import (
"errors"
"fmt"
"io"
"os"
"os/exec"
"strconv"
"strings"
"sync"
"github.com/google/syzkaller/pkg/log"
"github.com/google/syzkaller/pkg/osutil"
)
// Fsck runs fsckCmd against a file system image provided in r. It returns the
// fsck logs, whether the file system is clean and an error in case fsck could
// not be run.
func Fsck(r io.Reader, fsckCmd string) ([]byte, bool, error) {
// Write the image to a temporary file.
tempFile, err := os.CreateTemp("", "*.img")
if err != nil {
return nil, false, fmt.Errorf("failed to create temporary file: %w", err)
}
defer os.Remove(tempFile.Name())
_, err = io.Copy(tempFile, r)
if err != nil {
return nil, false, fmt.Errorf("failed to write data to temporary file: %w", err)
}
if err := tempFile.Close(); err != nil {
return nil, false, fmt.Errorf("failed to close temporary file: %w", err)
}
osutil.SandboxChown(tempFile.Name())
// And run the provided fsck command on it.
fsck := append(strings.Fields(fsckCmd), tempFile.Name())
cmd := osutil.Command(fsck[0], fsck[1:]...)
if err := osutil.Sandbox(cmd, true, true); err != nil {
return nil, false, err
}
exitCode := 0
output, err := cmd.CombinedOutput()
if err != nil {
var exitError (*exec.ExitError)
ok := errors.As(err, &exitError)
if ok {
exitCode = exitError.ExitCode()
} else {
return nil, false, err
}
}
prefix := fsckCmd + " exited with status code " + strconv.Itoa(exitCode) + "\n"
return append([]byte(prefix), output...), exitCode == 0, nil
}
type FsckChecker struct {
mu sync.Mutex
exists map[string]bool
}
func (fc *FsckChecker) Exists(cmd string) bool {
fc.mu.Lock()
defer fc.mu.Unlock()
bin := strings.Fields(cmd)[0]
if ret, ok := fc.exists[bin]; ok {
return ret
}
if fc.exists == nil {
fc.exists = map[string]bool{}
}
_, err := exec.LookPath(bin)
found := err == nil
if !found {
log.Logf(0, "%s not found, images won't be checked", bin)
}
fc.exists[bin] = found
return found
}
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