O_NOATIME on Linux

archiver.go

@@ -169,7 +169,7 @@ func (arch *Archiver) SaveTreeJSON(item interface{}) (Blob, error) {
 // SaveFile stores the content of the file on the backend as a Blob by calling
 // Save for each chunk.
 func (arch *Archiver) SaveFile(p *Progress, node *Node) (Blobs, error) {
-	file, err := os.Open(node.path)
+	file, err := node.OpenForReading()
 	defer file.Close()
 	if err != nil {
 		return nil, err

node_darwin.go

@@ -11,6 +11,10 @@ import (
 	"github.com/restic/restic/debug"
 )
 
+func (node *Node) OpenForReading() (*os.File, error) {
+	return os.Open(n.path)
+}
+
 func (node *Node) fill_extra(path string, fi os.FileInfo) (err error) {
 	stat, ok := fi.Sys().(*syscall.Stat_t)
 	if !ok {

node_linux.go

@@ -11,6 +11,10 @@ import (
 	"github.com/restic/restic/debug"
 )
 
+func (node *Node) OpenForReading() (*os.File, error) {
+	return os.OpenFile(node.path, os.O_RDONLY|syscall.O_NOATIME, 0)
+}
+
 func (node *Node) fill_extra(path string, fi os.FileInfo) error {
 	stat, ok := fi.Sys().(*syscall.Stat_t)
 	if !ok {

node_windows.go

@@ -2,6 +2,10 @@ package restic
 
 import "os"
 
+func (node *Node) OpenForReading() (*os.File, error) {
+	return os.Open(n.path)
+}
+
 func (node *Node) fill_extra(path string, fi os.FileInfo) error {
 	return nil
 }