libpod: Factor out setting volume atime to container_internal_linux.go

It turns out that field names in syscall.Stat_t are platform-specific.
An alternative to this could change fixVolumePermissions to use
unix.Lstat since unix.Stat_t uses the same mmember name for Atim on both
Linux and FreeBSD.

[NO NEW TESTS NEEDED]

Signed-off-by: Doug Rabson <dfr@rabson.org>

libpod/container_internal_common.go

@@ -2654,9 +2654,7 @@ func (c *Container) fixVolumePermissions(v *ContainerNamedVolume) error {
 			if err := os.Chmod(mountPoint, st.Mode()); err != nil {
 				return err
 			}
-			stat := st.Sys().(*syscall.Stat_t)
-			atime := time.Unix(int64(stat.Atim.Sec), int64(stat.Atim.Nsec)) //nolint: unconvert
-			if err := os.Chtimes(mountPoint, atime, st.ModTime()); err != nil {
+			if err := setVolumeAtime(mountPoint, st); err != nil {
 				return err
 			}
 		} else if !os.IsNotExist(err) {

libpod/container_internal_freebsd.go

@@ -274,3 +274,12 @@ func (c *Container) isSlirp4netnsIPv6() (bool, error) {
 func (c *Container) hasNetNone() bool {
 	return c.state.NetworkJail == ""
 }
+
+func setVolumeAtime(mountPoint string, st os.FileInfo) error {
+	stat := st.Sys().(*syscall.Stat_t)
+	atime := time.Unix(int64(stat.Atimespec.Sec), int64(stat.Atimespec.Nsec)) //nolint: unconvert
+	if err := os.Chtimes(mountPoint, atime, st.ModTime()); err != nil {
+		return err
+	}
+	return nil
+}

libpod/container_internal_linux.go

@@ -11,6 +11,7 @@ import (
 	"strings"
 	"sync"
 	"syscall"
+	"time"
 
 	"github.com/containernetworking/plugins/pkg/ns"
 	"github.com/containers/common/libnetwork/types"
@@ -634,3 +635,12 @@ func (c *Container) hasNetNone() bool {
 	}
 	return false
 }
+
+func setVolumeAtime(mountPoint string, st os.FileInfo) error {
+	stat := st.Sys().(*syscall.Stat_t)
+	atime := time.Unix(int64(stat.Atim.Sec), int64(stat.Atim.Nsec)) //nolint: unconvert
+	if err := os.Chtimes(mountPoint, atime, st.ModTime()); err != nil {
+		return err
+	}
+	return nil
+}