// Write the pidfile based on the flag. It is an error if the pidfile hasn't
// been configured.
func Write() error {
if *pidfile == "" {
return errNotConfigured
}
if err := os.MkdirAll(filepath.Dir(*pidfile), os.FileMode(0755)); err != nil {
return err
}
file, err := atomicfile.New(*pidfile, os.FileMode(0644))
if err != nil {
return fmt.Errorf("error opening pidfile %s: %s", *pidfile, err)
}
defer file.Close() // in case we fail before the explicit close
_, err = fmt.Fprintf(file, "%d", os.Getpid())
if err != nil {
return err
}
err = file.Close()
if err != nil {
return err
}
return nil
}
func WritePidfile(pidfile string, pid int) error {
if pidfile == "" {
return errors.New("pidfile not configured")
}
if err := os.MkdirAll(filepath.Dir(pidfile), os.FileMode(0755)); err != nil {
return err
}
file, err := atomicfile.New(pidfile, os.FileMode(0644))
if err != nil {
return fmt.Errorf("error opening pidfile %s: %s", pidfile, err)
}
defer file.Close()
_, err = fmt.Fprintf(file, "%d", pid)
if err != nil {
return err
}
err = file.Close()
if err != nil {
return err
}
return nil
}
func TestAbort(t *testing.T) {
contents := []byte("the answer is 42")
t.Parallel()
tmpfile, err := ioutil.TempFile("", "atomicfile-abort-")
if err != nil {
t.Fatal(err)
}
name := tmpfile.Name()
if _, err := tmpfile.Write(contents); err != nil {
t.Fatal(err)
}
defer os.Remove(name)
f, err := atomicfile.New(name, os.FileMode(0666))
if err != nil {
t.Fatal(err)
}
f.Write([]byte("foo"))
if err := f.Abort(); err != nil {
t.Fatal(err)
}
if _, err := os.Stat(name); err != nil {
t.Fatalf("expected file to exist: %s", err)
}
actual, err := ioutil.ReadFile(name)
if err != nil {
t.Fatal(err)
}
if !bytes.Equal(contents, actual) {
t.Fatalf(`did not find expected "%s" instead found "%s"`, contents, actual)
}
}
func test(t *testing.T, dir, prefix string) {
t.Parallel()
tmpfile, err := ioutil.TempFile(dir, prefix)
if err != nil {
t.Fatal(err)
}
name := tmpfile.Name()
if err := os.Remove(name); err != nil {
t.Fatal(err)
}
defer os.Remove(name)
f, err := atomicfile.New(name, os.FileMode(0666))
if err != nil {
t.Fatal(err)
}
f.Write([]byte("foo"))
if _, err := os.Stat(name); !os.IsNotExist(err) {
t.Fatal("did not expect file to exist")
}
if err := f.Close(); err != nil {
t.Fatal(err)
}
if _, err := os.Stat(name); err != nil {
t.Fatalf("expected file to exist: %s", err)
}
}
func (t LocalTarget) Create() (*atomicfile.File, error) {
dirname := filepath.Dir(t.Path)
if _, err := os.Stat(dirname); os.IsNotExist(err) {
if err := os.MkdirAll(dirname, 0755); err != nil {
return nil, err
}
}
return atomicfile.New(t.Path, 0644)
}
// WriteConfigFile writes the config from `cfg` into `filename`.
func WriteConfigFile(filename string, cfg interface{}) error {
err := os.MkdirAll(filepath.Dir(filename), 0775)
if err != nil {
return err
}
f, err := atomicfile.New(filename, 0660)
if err != nil {
return err
}
defer f.Close()
return encode(f, cfg)
}