Move archive to pkg/archive

Signed-off-by: Derek McGowan <derek@mcg.dev>

pkg/archive/time.go

@@ -0,0 +1,54 @@
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package archive
+
+import (
+	"syscall"
+	"time"
+	"unsafe"
+)
+
+var (
+	minTime = time.Unix(0, 0)
+	maxTime time.Time
+)
+
+func init() {
+	if unsafe.Sizeof(syscall.Timespec{}.Nsec) == 8 {
+		// This is a 64 bit timespec
+		// os.Chtimes limits time to the following
+		maxTime = time.Unix(0, 1<<63-1)
+	} else {
+		// This is a 32 bit timespec
+		maxTime = time.Unix(1<<31-1, 0)
+	}
+}
+
+func boundTime(t time.Time) time.Time {
+	if t.Before(minTime) || t.After(maxTime) {
+		return minTime
+	}
+
+	return t
+}
+
+func latestTime(t1, t2 time.Time) time.Time {
+	if t1.Before(t2) {
+		return t2
+	}
+	return t1
+}