cleanup: move pkg/ to internal/

The internal/ directory in Go has a special meaning, and indicates that
those packages are not meant for external consumption. Ceph-CSI does
provide public APIs for other projects to consume. There is no plan to
keep the API of the internally used packages stable.

Closes: #903
Signed-off-by: Niels de Vos <ndevos@redhat.com>

internal/util/cephconf.go

@@ -0,0 +1,71 @@
+/*
+Copyright 2018 The Ceph-CSI Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package util
+
+import (
+	"io/ioutil"
+	"os"
+)
+
+var cephConfig = []byte(`[global]
+auth_cluster_required = cephx
+auth_service_required = cephx
+auth_client_required = cephx
+
+# Workaround for http://tracker.ceph.com/issues/23446
+fuse_set_user_groups = false
+`)
+
+const (
+	cephConfigRoot = "/etc/ceph"
+	// CephConfigPath ceph configuration file
+	CephConfigPath = "/etc/ceph/ceph.conf"
+
+	keyRing = "/etc/ceph/keyring"
+)
+
+func createCephConfigRoot() error {
+	return os.MkdirAll(cephConfigRoot, 0755) // #nosec
+}
+
+// WriteCephConfig writes out a basic ceph.conf file, making it easy to use
+// ceph related CLIs
+func WriteCephConfig() error {
+	if err := createCephConfigRoot(); err != nil {
+		return err
+	}
+
+	err := ioutil.WriteFile(CephConfigPath, cephConfig, 0640)
+	if err != nil {
+		return err
+	}
+
+	return createKeyRingFile()
+}
+
+/*
+if any ceph commands fails it will log below error message
+
+7f39ff02a700 -1 auth: unable to find a keyring on
+/etc/ceph/ceph.client.admin.keyring,/etc/ceph/ceph.keyring,/etc/ceph/keyring,
+/etc/ceph/keyring.bin,: (2) No such file or directory
+*/
+// createKeyRingFile creates the keyring files to fix above error message logging
+func createKeyRingFile() error {
+	_, err := os.Create(keyRing)
+	return err
+}