fix: skip missing explicit data chunks

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: MarcStdt

internal/utils/fs.go

@@ -373,6 +373,9 @@ func validateExplicitChunks(dataDir string, chunks []*domain.Chunks) ([]*domain.
 		chunkRoot := filepath.Join(dataDir, chunk.Path)
 		err := filepath.WalkDir(chunkRoot, func(path string, d os.DirEntry, err error) error {
 			if err != nil {
+				if os.IsNotExist(err) {
+					return filepath.SkipDir
+				}
 				return err
 			}
 			if d.Type()&os.ModeSymlink == 0 {

internal/utils/fs_test.go

@@ -121,6 +121,22 @@ func TestAutoChunkDataDirSkipsMissingNestedParentRemainder(t *testing.T) {
 	}
 }
 
+func TestAutoChunkDataDirSkipsMissingExplicitChunkDuringValidation(t *testing.T) {
+	dataDir := t.TempDir()
+	writeFile(t, filepath.Join(dataDir, "install-lgsm.sh"), "install\n")
+
+	chunks, err := AutoChunkDataDir(dataDir, []*domain.Chunks{
+		{Name: "install-lgsm", Path: "install-lgsm.sh"},
+		{Name: "lgsm-launcher", Path: "arkserver"},
+		{Name: "serverfiles", Path: "serverfiles"},
+	})
+	if err != nil {
+		t.Fatalf("AutoChunkDataDir returned error: %v", err)
+	}
+
+	assertChunkPaths(t, chunks, []string{"install-lgsm.sh", "arkserver", "serverfiles"})
+}
+
 func TestAutoChunkDataDirRejectsOverlappingChunks(t *testing.T) {
 	dataDir := t.TempDir()
 	mkdirAll(t, filepath.Join(dataDir, "serverfiles", "ShooterGame", "Content", "Maps"))