vendor/github.com/fsouza/go-dockerclient/external/github.com/docker/docker/pkg/system/chtimes.go

   1 package system
   2
   3 import (
   4         "os"
   5         "syscall"
   6         "time"
   7         "unsafe"
   8 )
   9
  10 var (
  11         maxTime time.Time
  12 )
  13
  14 func init() {
  15         if unsafe.Sizeof(syscall.Timespec{}.Nsec) == 8 {
  16                 // This is a 64 bit timespec
  17                 // os.Chtimes limits time to the following
  18                 maxTime = time.Unix(0, 1<<63-1)
  19         } else {
  20                 // This is a 32 bit timespec
  21                 maxTime = time.Unix(1<<31-1, 0)
  22         }
  23 }
  24
  25 // Chtimes changes the access time and modified time of a file at the given path
  26 func Chtimes(name string, atime time.Time, mtime time.Time) error {
  27         unixMinTime := time.Unix(0, 0)
  28         unixMaxTime := maxTime
  29
  30         // If the modified time is prior to the Unix Epoch, or after the
  31         // end of Unix Time, os.Chtimes has undefined behavior
  32         // default to Unix Epoch in this case, just in case
  33
  34         if atime.Before(unixMinTime) || atime.After(unixMaxTime) {
  35                 atime = unixMinTime
  36         }
  37
  38         if mtime.Before(unixMinTime) || mtime.After(unixMaxTime) {
  39                 mtime = unixMinTime
  40         }
  41
  42         if err := os.Chtimes(name, atime, mtime); err != nil {
  43                 return err
  44         }
  45
  46         return nil
  47 }