Add basic libvirt instance plugin (#477)

Signed-off-by: Ian Campbell <[email protected]>

Author: Ian Campbell

Makefile

@@ -127,6 +127,7 @@ endif
 	$(call build_binary,infrakit-flavor-swarm,github.com/docker/infrakit/examples/flavor/swarm)
 	$(call build_binary,infrakit-flavor-vanilla,github.com/docker/infrakit/examples/flavor/vanilla)
 	$(call build_binary,infrakit-flavor-zookeeper,github.com/docker/infrakit/examples/flavor/zookeeper)
+	$(call build_binary,infrakit-instance-libvirt,github.com/docker/infrakit/cmd/instance/libvirt)
 	$(call build_binary,infrakit-instance-file,github.com/docker/infrakit/examples/instance/file)
 	$(call build_binary,infrakit-instance-terraform,github.com/docker/infrakit/examples/instance/terraform)
 	$(call build_binary,infrakit-instance-vagrant,github.com/docker/infrakit/examples/instance/vagrant)

circle.yml

@@ -37,6 +37,7 @@ dependencies:
 
     # Install dependencies
     - cd $WORKDIR && go get github.com/golang/lint/golint github.com/wfarner/blockcheck
+    - sudo apt-get update && sudo apt-get install -y libvirt-dev
 
 test:
   override:

cmd/instance/libvirt/libvirt.json

@@ -0,0 +1,32 @@
+{
+    "ID": "cattle",
+    "Properties": {
+        "Allocation": {
+            "Size": 1
+        },
+        "Instance": {
+            "Plugin": "instance-libvirt",
+            "Properties": {
+                "Kernel": "../bzImage",
+                "Ramdisk": "../initrd.img",
+                "CmdlineFile": "../cmdline",
+                "Disk" : 512,
+                "CPUs" : 2,
+                "Memory" : 1024
+            }
+        },
+        "Flavor": {
+            "Plugin": "flavor-vanilla",
+            "Properties": {
+                "Init": [
+                    "test1",
+                    "test2"
+                ],
+                "Tags": {
+                    "tier": "sample",
+                    "project": "infrakit"
+                }
+            }
+        }
+    }
+}

cmd/instance/libvirt/main.go

@@ -0,0 +1,74 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"os/user"
+
+	log "github.com/Sirupsen/logrus"
+	"github.com/spf13/cobra"
+
+	"github.com/docker/infrakit/pkg/cli"
+	instance "github.com/docker/infrakit/pkg/plugin/instance/libvirt"
+	"github.com/docker/infrakit/pkg/plugin/metadata"
+	instance_plugin "github.com/docker/infrakit/pkg/rpc/instance"
+	metadata_plugin "github.com/docker/infrakit/pkg/rpc/metadata"
+	instance_spi "github.com/docker/infrakit/pkg/spi/instance"
+)
+
+func main() {
+
+	cmd := &cobra.Command{
+		Use:   os.Args[0],
+		Short: "Libvirt instance plugin",
+	}
+
+	name := cmd.Flags().String("name", "instance-libvirt", "Plugin name to advertise for discovery")
+	logLevel := cmd.Flags().Int("log", cli.DefaultLogLevel, "Logging level. 0 is least verbose. Max is 5")
+
+	uri := cmd.Flags().String("uri", "qemu:///session", "libvirt URI to connect to")
+
+	cmd.RunE = func(c *cobra.Command, args []string) error {
+		cli.SetLogLevel(*logLevel)
+		cli.RunPlugin(*name,
+			instance_plugin.PluginServer(instance.NewLibvirtPlugin(*uri)),
+			metadata_plugin.PluginServer(metadata.NewPluginFromData(
+				map[string]interface{}{
+					"version":    cli.Version,
+					"revision":   cli.Revision,
+					"implements": instance_spi.InterfaceSpec,
+				},
+			)),
+		)
+		return nil
+	}
+
+	cmd.AddCommand(&cobra.Command{
+		Use:   "version",
+		Short: "print build version information",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			buff, err := json.MarshalIndent(map[string]interface{}{
+				"version":  cli.Version,
+				"revision": cli.Revision,
+			}, "  ", "  ")
+			if err != nil {
+				return err
+			}
+			fmt.Println(string(buff))
+			return nil
+		},
+	})
+
+	if err := cmd.Execute(); err != nil {
+		log.Error(err)
+		os.Exit(1)
+	}
+}
+
+func getHome() string {
+	if usr, err := user.Current(); err == nil {
+		return usr.HomeDir
+	}
+	return os.Getenv("HOME")
+}

dockerfiles/Dockerfile.build

@@ -1,6 +1,6 @@
 FROM golang:1.8-alpine
 
-RUN apk add --update git make gcc musl-dev wget ca-certificates openssl
+RUN apk add --update git make gcc musl-dev wget ca-certificates openssl libvirt-dev
 RUN go get github.com/rancher/trash
 
 WORKDIR /go/src/github.com/docker/infrakit