add cloud-init support for cloudstack

config/cloudinit/datasource/metadata/cloudstack/metadata.go

@@ -0,0 +1,118 @@
+// Copyright 2015 CoreOS, Inc.
+//
+// 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 cloudstack
+
+import (
+	"net"
+	"strconv"
+	"strings"
+
+	"github.com/rancher/os/netconf"
+
+	"github.com/rancher/os/config/cloudinit/datasource"
+	"github.com/rancher/os/config/cloudinit/datasource/metadata"
+	"github.com/rancher/os/config/cloudinit/pkg"
+	"github.com/rancher/os/log"
+	"github.com/vishvananda/netlink"
+)
+
+const (
+	apiVersion   = "latest/"
+	userdataPath = apiVersion + "user-data"
+	metadataPath = apiVersion + "meta-data/"
+
+	serverIdentifier = "dhcp_server_identifier"
+)
+
+type MetadataService struct {
+	metadata.Service
+}
+
+func NewDatasource(root string) []*MetadataService {
+	roots := make([]string, 0, 5)
+
+	if root == "" {
+		if links, err := netlink.LinkList(); err == nil {
+			log.Infof("Checking to see if a cloudstack server-identifier is available")
+			for _, link := range links {
+				linkName := link.Attrs().Name
+				if linkName == "lo" {
+					continue
+				}
+
+				log.Infof("searching for cloudstack server %s on %s", serverIdentifier, linkName)
+				lease := netconf.GetDhcpLease(linkName)
+				if server, ok := lease[serverIdentifier]; ok {
+					log.Infof("found cloudstack server '%s'", server)
+					server = "http://" + server + "/"
+					roots = append(roots, server)
+				}
+			}
+		} else {
+			log.Errorf("error getting LinkList: %s", err)
+		}
+	} else {
+		roots = append(roots, root)
+	}
+
+	sources := make([]*MetadataService, 0, len(roots))
+	for _, server := range roots {
+		datasource := metadata.NewDatasourceWithCheckPath(server, apiVersion, metadataPath, userdataPath, metadataPath, nil)
+		sources = append(sources, &MetadataService{datasource})
+	}
+	return sources
+}
+
+func (ms MetadataService) AvailabilityChanges() bool {
+	// TODO: if it can't find the network, maybe we can start it?
+	return false
+}
+
+func (ms MetadataService) FetchMetadata() (datasource.Metadata, error) {
+	metadata := datasource.Metadata{}
+
+	if sshKeys, err := ms.FetchAttributes("public-keys"); err == nil {
+		metadata.SSHPublicKeys = map[string]string{}
+		for i, sshkey := range sshKeys {
+			log.Printf("Found SSH key %d", i)
+			metadata.SSHPublicKeys[strconv.Itoa(i)] = sshkey
+		}
+	} else if _, ok := err.(pkg.ErrNotFound); !ok {
+		return metadata, err
+	}
+
+	if hostname, err := ms.FetchAttribute("local-hostname"); err == nil {
+		metadata.Hostname = strings.Split(hostname, " ")[0]
+	} else if _, ok := err.(pkg.ErrNotFound); !ok {
+		return metadata, err
+	}
+
+	if localAddr, err := ms.FetchAttribute("local-ipv4"); err == nil {
+		metadata.PrivateIPv4 = net.ParseIP(localAddr)
+	} else if _, ok := err.(pkg.ErrNotFound); !ok {
+		return metadata, err
+	}
+	if publicAddr, err := ms.FetchAttribute("public-ipv4"); err == nil {
+		metadata.PublicIPv4 = net.ParseIP(publicAddr)
+	} else if _, ok := err.(pkg.ErrNotFound); !ok {
+		return metadata, err
+	}
+
+	return metadata, nil
+}
+
+func (ms MetadataService) Type() string {
+	return "cloudstack-metadata-service"
+}