github.com/lalkh/containerd@v1.4.3/archive/time.go (about)

     1  /*
     2     Copyright The containerd Authors.
     3  
     4     Licensed under the Apache License, Version 2.0 (the "License");
     5     you may not use this file except in compliance with the License.
     6     You may obtain a copy of the License at
     7  
     8         http://www.apache.org/licenses/LICENSE-2.0
     9  
    10     Unless required by applicable law or agreed to in writing, software
    11     distributed under the License is distributed on an "AS IS" BASIS,
    12     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13     See the License for the specific language governing permissions and
    14     limitations under the License.
    15  */
    16  
    17  package archive
    18  
    19  import (
    20  	"syscall"
    21  	"time"
    22  	"unsafe"
    23  )
    24  
    25  var (
    26  	minTime = time.Unix(0, 0)
    27  	maxTime time.Time
    28  )
    29  
    30  func init() {
    31  	if unsafe.Sizeof(syscall.Timespec{}.Nsec) == 8 {
    32  		// This is a 64 bit timespec
    33  		// os.Chtimes limits time to the following
    34  		maxTime = time.Unix(0, 1<<63-1)
    35  	} else {
    36  		// This is a 32 bit timespec
    37  		maxTime = time.Unix(1<<31-1, 0)
    38  	}
    39  }
    40  
    41  func boundTime(t time.Time) time.Time {
    42  	if t.Before(minTime) || t.After(maxTime) {
    43  		return minTime
    44  	}
    45  
    46  	return t
    47  }
    48  
    49  func latestTime(t1, t2 time.Time) time.Time {
    50  	if t1.Before(t2) {
    51  		return t2
    52  	}
    53  	return t1
    54  }