Add glide.yaml and vendor deps

vendor/k8s.io/kubernetes/pkg/cloudprovider/providers/openstack/metadata.go

@@ -0,0 +1,156 @@
+/*
+Copyright 2016 The Kubernetes 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 openstack
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"net/http"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/golang/glog"
+	"k8s.io/kubernetes/pkg/util/exec"
+	"k8s.io/kubernetes/pkg/util/mount"
+)
+
+// metadataUrl is URL to OpenStack metadata server. It's hardcoded IPv4
+// link-local address as documented in "OpenStack Cloud Administrator Guide",
+// chapter Compute - Networking with nova-network.
+// http://docs.openstack.org/admin-guide-cloud/compute-networking-nova.html#metadata-service
+const metadataUrl = "http://169.254.169.254/openstack/2012-08-10/meta_data.json"
+
+// Config drive is defined as an iso9660 or vfat (deprecated) drive
+// with the "config-2" label.
+// http://docs.openstack.org/user-guide/cli-config-drive.html
+const configDriveLabel = "config-2"
+const configDrivePath = "openstack/2012-08-10/meta_data.json"
+
+var ErrBadMetadata = errors.New("Invalid OpenStack metadata, got empty uuid")
+
+// Assumes the "2012-08-10" meta_data.json format.
+// See http://docs.openstack.org/user-guide/cli_config_drive.html
+type Metadata struct {
+	Uuid             string `json:"uuid"`
+	Name             string `json:"name"`
+	AvailabilityZone string `json:"availability_zone"`
+	// .. and other fields we don't care about.  Expand as necessary.
+}
+
+// parseMetadataUUID reads JSON from OpenStack metadata server and parses
+// instance ID out of it.
+func parseMetadata(r io.Reader) (*Metadata, error) {
+	var metadata Metadata
+	json := json.NewDecoder(r)
+	if err := json.Decode(&metadata); err != nil {
+		return nil, err
+	}
+
+	if metadata.Uuid == "" {
+		return nil, ErrBadMetadata
+	}
+
+	return &metadata, nil
+}
+
+func getMetadataFromConfigDrive() (*Metadata, error) {
+	// Try to read instance UUID from config drive.
+	dev := "/dev/disk/by-label/" + configDriveLabel
+	if _, err := os.Stat(dev); os.IsNotExist(err) {
+		out, err := exec.New().Command(
+			"blkid", "-l",
+			"-t", "LABEL="+configDriveLabel,
+			"-o", "device",
+		).CombinedOutput()
+		if err != nil {
+			glog.V(2).Infof("Unable to run blkid: %v", err)
+			return nil, err
+		}
+		dev = strings.TrimSpace(string(out))
+	}
+
+	mntdir, err := ioutil.TempDir("", "configdrive")
+	if err != nil {
+		return nil, err
+	}
+	defer os.Remove(mntdir)
+
+	glog.V(4).Infof("Attempting to mount configdrive %s on %s", dev, mntdir)
+
+	mounter := mount.New("" /* default mount path */)
+	err = mounter.Mount(dev, mntdir, "iso9660", []string{"ro"})
+	if err != nil {
+		err = mounter.Mount(dev, mntdir, "vfat", []string{"ro"})
+	}
+	if err != nil {
+		glog.Errorf("Error mounting configdrive %s: %v", dev, err)
+		return nil, err
+	}
+	defer mounter.Unmount(mntdir)
+
+	glog.V(4).Infof("Configdrive mounted on %s", mntdir)
+
+	f, err := os.Open(
+		filepath.Join(mntdir, configDrivePath))
+	if err != nil {
+		glog.Errorf("Error reading %s on config drive: %v", configDrivePath, err)
+		return nil, err
+	}
+	defer f.Close()
+
+	return parseMetadata(f)
+}
+
+func getMetadataFromMetadataService() (*Metadata, error) {
+	// Try to get JSON from metdata server.
+	glog.V(4).Infof("Attempting to fetch metadata from %s", metadataUrl)
+	resp, err := http.Get(metadataUrl)
+	if err != nil {
+		glog.V(3).Infof("Cannot read %s: %v", metadataUrl, err)
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		err = fmt.Errorf("Unexpected status code when reading metadata from %s: %s", metadataUrl, resp.Status)
+		glog.V(3).Infof("%v", err)
+		return nil, err
+	}
+
+	return parseMetadata(resp.Body)
+}
+
+// Metadata is fixed for the current host, so cache the value process-wide
+var metadataCache *Metadata
+
+func getMetadata() (*Metadata, error) {
+	if metadataCache == nil {
+		md, err := getMetadataFromConfigDrive()
+		if err != nil {
+			md, err = getMetadataFromMetadataService()
+		}
+		if err != nil {
+			return nil, err
+		}
+		metadataCache = md
+	}
+	return metadataCache, nil
+}