provisioning: follow symlinked folders

fixes #11958

pkg/services/provisioning/dashboards/file_reader.go

@@ -47,6 +47,11 @@ func NewDashboardFileReader(cfg *DashboardsAsConfig, log log.Logger) (*fileReade
 		log.Error("Cannot read directory", "error", err)
 	}
 
+	path, err := filepath.EvalSymlinks(path)
+	if err != nil {
+		log.Error("Failed to read content of symlinked path: %s", path)
+	}
+
 	absPath, err := filepath.Abs(path)
 	if err != nil {
 		log.Error("Could not create absolute path ", "path", path)

pkg/services/provisioning/dashboards/file_reader_linux_test.go

@@ -0,0 +1,39 @@
+// +build linux
+
+package dashboards
+
+import (
+	"path/filepath"
+	"testing"
+
+	"github.com/grafana/grafana/pkg/log"
+)
+
+var (
+	symlinkedFolder = "testdata/test-dashboards/symlink"
+)
+
+func TestProvsionedSymlinkedFolder(t *testing.T) {
+	cfg := &DashboardsAsConfig{
+		Name:    "Default",
+		Type:    "file",
+		OrgId:   1,
+		Folder:  "",
+		Options: map[string]interface{}{"path": symlinkedFolder},
+	}
+
+	reader, err := NewDashboardFileReader(cfg, log.New("test-logger"))
+	if err != nil {
+		t.Error("expected err to be nil")
+	}
+
+	want, err := filepath.Abs(containingId)
+
+	if err != nil {
+		t.Errorf("expected err to be nill")
+	}
+
+	if reader.Path != want {
+		t.Errorf("got %s want %s", reader.Path, want)
+	}
+}

pkg/services/provisioning/dashboards/testdata/test-dashboards/symlink

@@ -0,0 +1 @@
+containing-id/