Allow to update organized file's mtime corresponding to the original file's creation date

README.md

@@ -55,7 +55,7 @@ photocalog -target ./photos/ ./sync/photos/*
 ### Monitor
 #### Copy files (make a COW if fs supports it)
 ```bash
-photocalog -mode copy -target ./photos/ ./sync/photos/*
+photocalog -mode copy -target ./photos -monitor ./sync/photos/*
 ```
 
 #### Create hardlinks (only withing one disk partition)

cmd/photocatalog/photocatalog.go

@@ -19,6 +19,7 @@ func main() {
 	mode := flag.String("mode", "hardlink", "Manage mode: copy or hardlink")
 	target := flag.String("target", "./", "Root directory to organize files in")
 	monitor := flag.String("monitor", "", "Monitor specified folder for new files")
+	updateMtime := flag.Bool("update_mtime", false, "Update mtime on organized files to be equal to the files creation date")
 
 	flag.Parse()
 	args := flag.Args()
@@ -34,7 +35,7 @@ func main() {
 		log.Fatalf("Invalid mode %s", *mode)
 	}
 
-	mgr, err := manager.NewManager(*target, manageMode)
+	mgr, err := manager.NewManager(*target, manageMode, *updateMtime)
 	if err != nil {
 		log.Fatalf(err.Error())
 	}

pkg/manager/manager.go

@@ -7,6 +7,7 @@ import (
 	"os/exec"
 	"path"
 	"strings"
+	"time"
 
 	"github.com/pkg/errors"
 
@@ -16,16 +17,18 @@ import (
 type Manager struct {
 	TargetPath  string
 	Mode        ManageMode
+	updateMtime bool
 
 	processor       func(fp, targetDir string) (string, error)
 	extractorsCache map[string]metadata.Extractor
 }
 
-func NewManager(target string, mode ManageMode) (*Manager, error) {
+func NewManager(target string, mode ManageMode, updateMtime bool) (*Manager, error) {
 	manager := Manager{
 		TargetPath:  target,
 		Mode:        mode,
 		processor:   nil,
+		updateMtime: updateMtime,
 	}
 	if err := manager.initProcessor(); err != nil {
 		return nil, err
@@ -123,6 +126,13 @@ func (m *Manager) Manage(fp string) error {
 		return errors.WithMessagef(err, "failed to process %s to %s", fp, targetDir)
 	}
 
+	if m.updateMtime {
+		err = os.Chtimes(target, time.Now(), md.Time)
+		if err != nil {
+			return errors.WithMessage(err, "failed to update mtime/atime")
+		}
+	}
+
 	if m.Mode == Hardlink {
 		log.Println(fp, "linked to", target)
 	} else if m.Mode == Copy {