Add fusetesting.GetTimes.

This makes it easier to write integration tests for atime, ctime, and
mtime on both darwin and linux.

fusetesting/stat.go

@@ -18,6 +18,7 @@ import (
 	"fmt"
 	"os"
 	"reflect"
+	"syscall"
 	"time"
 
 	"github.com/jacobsa/oglematchers"
@@ -95,6 +96,12 @@ func birthtimeIsWithin(
 	return nil
 }
 
+// Extract time information from the supplied file info. Panic on platforms
+// where this is not possible.
+func GetTimes(fi os.FileInfo) (atime, ctime, mtime time.Time) {
+	return getTimes(fi.Sys().(*syscall.Stat_t))
+}
+
 // Match os.FileInfo values that specify a number of links equal to the given
 // number. On platforms where there is no nlink field available, match all
 // os.FileInfo values.

fusetesting/stat_darwin.go

@@ -36,3 +36,10 @@ func extractNlink(sys interface{}) (nlink uint64, ok bool) {
 	ok = true
 	return
 }
+
+func getTimes(stat *syscall.Stat_t) (atime, ctime, mtime time.Time) {
+	atime = time.Unix(stat.Atimespec.Unix())
+	ctime = time.Unix(stat.Ctimespec.Unix())
+	mtime = time.Unix(stat.Mtimespec.Unix())
+	return
+}

fusetesting/stat_linux.go

@@ -34,3 +34,10 @@ func extractNlink(sys interface{}) (nlink uint64, ok bool) {
 	ok = true
 	return
 }
+
+func getTimes(stat *syscall.Stat_t) (atime, ctime, mtime time.Time) {
+	atime = time.Unix(stat.Atim.Unix())
+	ctime = time.Unix(stat.Ctim.Unix())
+	mtime = time.Unix(stat.Mtim.Unix())
+	return
+}