use absolute path when getting grafana path; add test for directory (#36001)

pkg/infra/fs/exists_test.go

@@ -29,3 +29,17 @@ func TestExists_Existent(t *testing.T) {
 
 	require.True(t, exists)
 }
+
+func TestExists_Dir(t *testing.T) {
+	f, err := ioutil.TempDir("", "")
+	require.NoError(t, err)
+	t.Cleanup(func() {
+		err := os.Remove(f)
+		assert.NoError(t, err)
+	})
+
+	exists, err := Exists(f)
+
+	require.NoError(t, err)
+	require.True(t, exists)
+}

pkg/tests/testinfra/testinfra.go

@@ -121,13 +121,20 @@ func CreateGrafDir(t *testing.T, opts ...GrafanaOpts) (string, string) {
 	found := false
 	for i := 0; i < 20; i++ {
 		rootDir = filepath.Join(rootDir, "..")
-		exists, err := fs.Exists(filepath.Join(rootDir, "public", "views"))
+
+		dir, err := filepath.Abs(rootDir)
 		require.NoError(t, err)
+
+		exists, err := fs.Exists(filepath.Join(dir, "public", "views"))
+		require.NoError(t, err)
+
 		if exists {
+			rootDir = dir
 			found = true
 			break
 		}
 	}
+
 	require.True(t, found, "Couldn't detect project root directory")
 
 	cfgDir := filepath.Join(tmpDir, "conf")