Handle zip file modification (#877)

* Rescan zip if updating mod time
* Use inequality for mod time comparison
* Add sort by file_mod_time (fixes #469)

pkg/image/image.go

@@ -11,6 +11,7 @@ import (
 	"os"
 	"path/filepath"
 	"strings"
+	"time"
 
 	"github.com/stashapp/stash/pkg/models"
 	"github.com/stashapp/stash/pkg/utils"
@@ -120,6 +121,21 @@ func getFilePath(path string) (zipFilename, filename string) {
 	return
 }
 
+// GetFileDetails returns a pointer to an Image object with the
+// width, height and size populated.
+func GetFileDetails(path string) (*models.Image, error) {
+	i := &models.Image{
+		Path: path,
+	}
+
+	err := SetFileDetails(i)
+	if err != nil {
+		return nil, err
+	}
+
+	return i, nil
+}
+
 func SetFileDetails(i *models.Image) error {
 	f, err := stat(i.Path)
 	if err != nil {
@@ -147,6 +163,20 @@ func SetFileDetails(i *models.Image) error {
 	return nil
 }
 
+// GetFileModTime gets the file modification time, handling files in zip files.
+func GetFileModTime(path string) (time.Time, error) {
+	fi, err := stat(path)
+	if err != nil {
+		return time.Time{}, fmt.Errorf("error performing stat on %s: %s", path, err.Error())
+	}
+
+	ret := fi.ModTime()
+	// truncate to seconds, since we don't store beyond that in the database
+	ret = ret.Truncate(time.Second)
+
+	return ret, nil
+}
+
 func stat(path string) (os.FileInfo, error) {
 	// may need to read from a zip file
 	zipFilename, filename := getFilePath(path)