Podman machine info

Add podman machine info command, which displays infor about the machine
host as well as version info.

Signed-off-by: Ashley Cui <acui@redhat.com>

2 files changed, 195 insertions, 7 deletions

diff --git a/cmd/podman/machine/info.go b/cmd/podman/machine/info.go
new file mode 100644
index 000000000..9932027d8
--- /dev/null
+++ b/cmd/podman/machine/info.go
@@ -0,0 +1,182 @@
+//go:build amd64 || arm64
+// +build amd64 arm64
+
+package machine
+
+import (
+	"fmt"
+	"html/template"
+	"os"
+	"runtime"
+
+	"github.com/containers/common/pkg/completion"
+	"github.com/containers/common/pkg/config"
+	"github.com/containers/common/pkg/report"
+	"github.com/containers/podman/v4/cmd/podman/common"
+	"github.com/containers/podman/v4/cmd/podman/registry"
+	"github.com/containers/podman/v4/cmd/podman/validate"
+	"github.com/containers/podman/v4/libpod/define"
+	"github.com/containers/podman/v4/pkg/machine"
+	"github.com/ghodss/yaml"
+	"github.com/spf13/cobra"
+)
+
+var infoDescription = `Display information pertaining to the machine host.`
+
+var (
+	infoCmd = &cobra.Command{
+		Use:               "info [options]",
+		Short:             "Display machine host info",
+		Long:              infoDescription,
+		PersistentPreRunE: rootlessOnly,
+		RunE:              info,
+		Args:              validate.NoArgs,
+		ValidArgsFunction: completion.AutocompleteNone,
+		Example:           `podman machine info`,
+	}
+)
+
+var (
+	inFormat string
+)
+
+// Info contains info on the machine host and version info
+type Info struct {
+	Host    *HostInfo      `json:"Host"`
+	Version define.Version `json:"Version"`
+}
+
+// HostInfo contains info on the machine host
+type HostInfo struct {
+	Arch             string `json:"Arch"`
+	CurrentMachine   string `json:"CurrentMachine"`
+	DefaultMachine   string `json:"DefaultMachine"`
+	EventsDir        string `json:"EventsDir"`
+	MachineConfigDir string `json:"MachineConfigDir"`
+	MachineImageDir  string `json:"MachineImageDir"`
+	MachineState     string `json:"MachineState"`
+	NumberOfMachines int    `json:"NumberOfMachines"`
+	OS               string `json:"OS"`
+	VMType           string `json:"VMType"`
+}
+
+func init() {
+	registry.Commands = append(registry.Commands, registry.CliCommand{
+		Command: infoCmd,
+		Parent:  machineCmd,
+	})
+
+	flags := infoCmd.Flags()
+	formatFlagName := "format"
+	flags.StringVarP(&inFormat, formatFlagName, "f", "", "Change the output format to JSON or a Go template")
+	_ = infoCmd.RegisterFlagCompletionFunc(formatFlagName, common.AutocompleteFormat(&define.Info{}))
+}
+
+func info(cmd *cobra.Command, args []string) error {
+	info := Info{}
+	version, err := define.GetVersion()
+	if err != nil {
+		return fmt.Errorf("error getting version info %w", err)
+	}
+	info.Version = version
+
+	host, err := hostInfo()
+	if err != nil {
+		return err
+	}
+	info.Host = host
+
+	switch {
+	case report.IsJSON(inFormat):
+		b, err := json.MarshalIndent(info, "", "  ")
+		if err != nil {
+			return err
+		}
+		fmt.Println(string(b))
+	case cmd.Flags().Changed("format"):
+		tmpl := template.New(cmd.Name()).Funcs(template.FuncMap(report.DefaultFuncs))
+		inFormat = report.NormalizeFormat(inFormat)
+		tmpl, err := tmpl.Parse(inFormat)
+		if err != nil {
+			return err
+		}
+		return tmpl.Execute(os.Stdout, info)
+	default:
+		b, err := yaml.Marshal(info)
+		if err != nil {
+			return err
+		}
+		fmt.Println(string(b))
+	}
+
+	return nil
+}
+
+func hostInfo() (*HostInfo, error) {
+	host := HostInfo{}
+
+	host.Arch = runtime.GOARCH
+	host.OS = runtime.GOOS
+
+	provider := GetSystemDefaultProvider()
+	var listOpts machine.ListOptions
+	listResponse, err := provider.List(listOpts)
+	if err != nil {
+		return nil, fmt.Errorf("failed to get machines %w", err)
+	}
+
+	host.NumberOfMachines = len(listResponse)
+
+	cfg, err := config.ReadCustomConfig()
+	if err != nil {
+		return nil, err
+	}
+
+	// Default state of machine is stopped
+	host.MachineState = "Stopped"
+	for _, vm := range listResponse {
+		// Set default machine if found
+		if vm.Name == cfg.Engine.ActiveService {
+			host.DefaultMachine = vm.Name
+		}
+		// If machine is running or starting, it is automatically the current machine
+		if vm.Running {
+			host.CurrentMachine = vm.Name
+			host.MachineState = "Running"
+		} else if vm.Starting {
+			host.CurrentMachine = vm.Name
+			host.MachineState = "Starting"
+		}
+	}
+	// If no machines are starting or running, set current machine to default machine
+	// If no default machines are found, do not report a default machine or a state
+	if host.CurrentMachine == "" {
+		if host.DefaultMachine == "" {
+			host.MachineState = ""
+		} else {
+			host.CurrentMachine = host.DefaultMachine
+		}
+	}
+
+	host.VMType = provider.VMType()
+
+	dataDir, err := machine.GetDataDir(host.VMType)
+	if err != nil {
+		return nil, fmt.Errorf("failed to get machine image dir")
+	}
+	host.MachineImageDir = dataDir
+
+	confDir, err := machine.GetConfDir(host.VMType)
+	if err != nil {
+		return nil, fmt.Errorf("failed to get machine config dir %w", err)
+	}
+	host.MachineConfigDir = confDir
+
+	eventsDir, err := eventSockDir()
+	if err != nil {
+		return nil, fmt.Errorf("failed to get events dir: %w", err)
+	}
+	host.EventsDir = eventsDir
+
+	return &host, nil
+}
diff --git a/cmd/podman/machine/machine.go b/cmd/podman/machine/machine.go
index 5a8a06b9d..0618337cc 100644
--- a/cmd/podman/machine/machine.go
+++ b/cmd/podman/machine/machine.go
@@ -101,12 +101,6 @@ func resolveEventSock() ([]string, error) {
 		return []string{sock}, nil
 	}
 
-	xdg, err := util.GetRuntimeDir()
-	if err != nil {
-		logrus.Warnf("Failed to get runtime dir, machine events will not be published: %s", err)
-		return nil, nil
-	}
-
 	re := regexp.MustCompile(`machine_events.*\.sock`)
 	sockPaths := make([]string, 0)
 	fn := func(path string, info os.DirEntry, err error) error {
@@ -125,8 +119,12 @@ func resolveEventSock() ([]string, error) {
 		sockPaths = append(sockPaths, path)
 		return nil
 	}
+	sockDir, err := eventSockDir()
+	if err != nil {
+		logrus.Warnf("Failed to get runtime dir, machine events will not be published: %s", err)
+	}
 
-	if err := filepath.WalkDir(filepath.Join(xdg, "podman"), fn); err != nil {
+	if err := filepath.WalkDir(sockDir, fn); err != nil {
 		if errors.Is(err, os.ErrNotExist) {
 			return nil, nil
 		}
@@ -135,6 +133,14 @@ func resolveEventSock() ([]string, error) {
 	return sockPaths, nil
 }
 
+func eventSockDir() (string, error) {
+	xdg, err := util.GetRuntimeDir()
+	if err != nil {
+		return "", err
+	}
+	return filepath.Join(xdg, "podman"), nil
+}
+
 func newMachineEvent(status events.Status, event events.Event) {
 	openEventSock.Do(initMachineEvents)