Treat symlinks to directories like directories

This allows symlinking to create additional subalbums.

Closes: #431

api/scanner/scanner_album.go

@@ -181,7 +181,13 @@ func findMediaForAlbum(album *models.Album, cache *scanner_cache.AlbumScannerCac
 	for _, item := range dirContent {
 		photoPath := path.Join(album.Path, item.Name())
 
-		if !item.IsDir() && cache.IsPathMedia(photoPath) {
+		isDirSymlink, err := utils.IsDirSymlink(photoPath)
+		if err != nil {
+			log.Printf("Cannot detect whether %s is symlink to a directory. Pretending it is not", photoPath)
+			isDirSymlink = false
+		}
+
+		if !item.IsDir() && !isDirSymlink && cache.IsPathMedia(photoPath) {
 			// Match file against ignore data
 			if albumIgnore.MatchesPath(item.Name()) {
 				log.Printf("File %s ignored\n", item.Name())

api/scanner/scanner_user.go

@@ -11,6 +11,7 @@ import (
 	"github.com/photoview/photoview/api/graphql/models"
 	"github.com/photoview/photoview/api/scanner/scanner_cache"
 	"github.com/photoview/photoview/api/scanner/scanner_utils"
+	"github.com/photoview/photoview/api/utils"
 	"github.com/pkg/errors"
 	ignore "github.com/sabhiram/go-gitignore"
 	"gorm.io/gorm"
@@ -198,7 +199,13 @@ func findAlbumsForUser(db *gorm.DB, user *models.User, album_cache *scanner_cach
 				continue
 			}
 
-			if item.IsDir() && directoryContainsPhotos(subalbumPath, album_cache, albumIgnore) {
+			isDirSymlink, err := utils.IsDirSymlink(subalbumPath)
+			if err != nil {
+				scanErrors = append(scanErrors, errors.Wrapf(err, "could not check for symlink target of %s", subalbumPath))
+				continue
+			}
+
+			if (item.IsDir() || isDirSymlink) && directoryContainsPhotos(subalbumPath, album_cache, albumIgnore) {
 				scanQueue.PushBack(scanInfo{
 					path:   subalbumPath,
 					parent: album,