| package system // import "github.com/docker/docker/pkg/system" |
| |
| import ( |
| "os" |
| "syscall" |
| "time" |
| "unsafe" |
| ) |
| |
| // Used by Chtimes |
| var unixEpochTime, unixMaxTime time.Time |
| |
| func init() { |
| unixEpochTime = time.Unix(0, 0) |
| if unsafe.Sizeof(syscall.Timespec{}.Nsec) == 8 { |
| // This is a 64 bit timespec |
| // os.Chtimes limits time to the following |
| // |
| // Note that this intentionally sets nsec (not sec), which sets both sec |
| // and nsec internally in time.Unix(); |
| // https://github.com/golang/go/blob/go1.19.2/src/time/time.go#L1364-L1380 |
| unixMaxTime = time.Unix(0, 1<<63-1) |
| } else { |
| // This is a 32 bit timespec |
| unixMaxTime = time.Unix(1<<31-1, 0) |
| } |
| } |
| |
| // Chtimes changes the access time and modified time of a file at the given path. |
| // If the modified time is prior to the Unix Epoch (unixMinTime), or after the |
| // end of Unix Time (unixEpochTime), os.Chtimes has undefined behavior. In this |
| // case, Chtimes defaults to Unix Epoch, just in case. |
| func Chtimes(name string, atime time.Time, mtime time.Time) error { |
| if atime.Before(unixEpochTime) || atime.After(unixMaxTime) { |
| atime = unixEpochTime |
| } |
| |
| if mtime.Before(unixEpochTime) || mtime.After(unixMaxTime) { |
| mtime = unixEpochTime |
| } |
| |
| if err := os.Chtimes(name, atime, mtime); err != nil { |
| return err |
| } |
| |
| // Take platform specific action for setting create time. |
| return setCTime(name, mtime) |
| } |