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>

9 files changed, 320 insertions, 9 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)
 
diff --git a/docs/source/markdown/podman-machine-info.1.md b/docs/source/markdown/podman-machine-info.1.md
new file mode 100644
index 000000000..33c207d32
--- /dev/null
+++ b/docs/source/markdown/podman-machine-info.1.md
@@ -0,0 +1,36 @@
+% podman-machine-info(1)
+
+## NAME
+podman\-machine\-info - Display machine host info
+
+## SYNOPSIS
+**podman machine info**
+
+## DESCRIPTION
+
+Display information pertaining to the machine host.
+Rootless only, as all `podman machine` commands can be only be used with rootless Podman.
+
+## OPTIONS
+
+#### **--format**=*format*, **-f**
+
+Change output format to "json" or a Go template.
+
+#### **--help**
+
+Print usage statement.
+
+## EXAMPLES
+
+```
+$ podman machine info
+$ podman machine info --format json
+$ podman machine info --format {{.Host.Arch}}
+```
+
+## SEE ALSO
+**[podman(1)](podman.1.md)**, **[podman-machine(1)](podman-machine.1.md)**
+
+## HISTORY
+June 2022, Originally compiled by Ashley Cui <acui@redhat.com>
diff --git a/docs/source/markdown/podman-machine.1.md b/docs/source/markdown/podman-machine.1.md
index c55226e02..6197b8d4e 100644
--- a/docs/source/markdown/podman-machine.1.md
+++ b/docs/source/markdown/podman-machine.1.md
@@ -20,6 +20,7 @@ All `podman machine` commands are rootless only.
 
 | Command | Man Page                                             | Description                       |
 |---------|------------------------------------------------------|-----------------------------------|
+| info    | [podman-machine-info(1)](podman-machine-info.1.md)   | Display machine host info         |
 | init    | [podman-machine-init(1)](podman-machine-init.1.md)   | Initialize a new virtual machine  |
 | inspect | [podman-machine-inspect(1)](podman-machine-inspect.1.md)  | Inspect one or more virtual machines |
 | list    | [podman-machine-list(1)](podman-machine-list.1.md)   | List virtual machines             |
@@ -30,7 +31,7 @@ All `podman machine` commands are rootless only.
 | stop    | [podman-machine-stop(1)](podman-machine-stop.1.md)   | Stop a virtual machine            |
 
 ## SEE ALSO
-**[podman(1)](podman.1.md)**, **[podman-machine-init(1)](podman-machine-init.1.md)**, **[podman-machine-list(1)](podman-machine-list.1.md)**, **[podman-machine-rm(1)](podman-machine-rm.1.md)**, **[podman-machine-ssh(1)](podman-machine-ssh.1.md)**, **[podman-machine-start(1)](podman-machine-start.1.md)**, **[podman-machine-stop(1)](podman-machine-stop.1.md)**, **[podman-machine-inspect(1)](podman-machine-inspect.1.md)**
+**[podman(1)](podman.1.md)**, **[podman-machine-info(1)](podman-machine-info.1.md)**, **[podman-machine-init(1)](podman-machine-init.1.md)**, **[podman-machine-list(1)](podman-machine-list.1.md)**, **[podman-machine-rm(1)](podman-machine-rm.1.md)**, **[podman-machine-ssh(1)](podman-machine-ssh.1.md)**, **[podman-machine-start(1)](podman-machine-start.1.md)**, **[podman-machine-stop(1)](podman-machine-stop.1.md)**, **[podman-machine-inspect(1)](podman-machine-inspect.1.md)**
 
 ## HISTORY
 March 2021, Originally compiled by Ashley Cui <acui@redhat.com>
diff --git a/pkg/machine/config.go b/pkg/machine/config.go
index fcc129338..66fa6ab91 100644
--- a/pkg/machine/config.go
+++ b/pkg/machine/config.go
@@ -55,6 +55,7 @@ type Provider interface {
 	IsValidVMName(name string) (bool, error)
 	CheckExclusiveActiveVM() (bool, string, error)
 	RemoveAndCleanMachines() error
+	VMType() string
 }
 
 type RemoteConnectionType string
diff --git a/pkg/machine/e2e/config_info.go b/pkg/machine/e2e/config_info.go
new file mode 100644
index 000000000..410c7e518
--- /dev/null
+++ b/pkg/machine/e2e/config_info.go
@@ -0,0 +1,20 @@
+package e2e
+
+type infoMachine struct {
+	format string
+	cmd    []string
+}
+
+func (i *infoMachine) buildCmd(m *machineTestBuilder) []string {
+	cmd := []string{"machine", "info"}
+	if len(i.format) > 0 {
+		cmd = append(cmd, "--format", i.format)
+	}
+	i.cmd = cmd
+	return cmd
+}
+
+func (i *infoMachine) withFormat(format string) *infoMachine {
+	i.format = format
+	return i
+}
diff --git a/pkg/machine/e2e/info_test.go b/pkg/machine/e2e/info_test.go
new file mode 100644
index 000000000..eeabb78af
--- /dev/null
+++ b/pkg/machine/e2e/info_test.go
@@ -0,0 +1,58 @@
+package e2e
+
+import (
+	"github.com/containers/podman/v4/cmd/podman/machine"
+	jsoniter "github.com/json-iterator/go"
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+	. "github.com/onsi/gomega/gexec"
+)
+
+var _ = Describe("podman machine info", func() {
+	var (
+		mb      *machineTestBuilder
+		testDir string
+	)
+
+	BeforeEach(func() {
+		testDir, mb = setup()
+	})
+	AfterEach(func() {
+		teardown(originalHomeDir, testDir, mb)
+	})
+
+	It("machine info", func() {
+		info := new(infoMachine)
+		infoSession, err := mb.setCmd(info).run()
+		Expect(err).NotTo(HaveOccurred())
+		Expect(infoSession).Should(Exit(0))
+
+		// Verify go template works and check for no running machines
+		info = new(infoMachine)
+		infoSession, err = mb.setCmd(info.withFormat("{{.Host.NumberOfMachines}}")).run()
+		Expect(err).NotTo(HaveOccurred())
+		Expect(infoSession).Should(Exit(0))
+		Expect(infoSession.outputToString()).To(Equal("0"))
+
+		// Create a machine and check if info has been updated
+		i := new(initMachine)
+		initSession, err := mb.setCmd(i.withImagePath(mb.imagePath)).run()
+		Expect(err).To(BeNil())
+		Expect(initSession).To(Exit(0))
+
+		info = new(infoMachine)
+		infoSession, err = mb.setCmd(info.withFormat("{{.Host.NumberOfMachines}}")).run()
+		Expect(err).NotTo(HaveOccurred())
+		Expect(infoSession).Should(Exit(0))
+		Expect(infoSession.outputToString()).To(Equal("1"))
+
+		// Check if json is in correct format
+		infoSession, err = mb.setCmd(info.withFormat("json")).run()
+		Expect(err).NotTo(HaveOccurred())
+		Expect(infoSession).Should(Exit(0))
+
+		infoReport := &machine.Info{}
+		err = jsoniter.Unmarshal(infoSession.Bytes(), infoReport)
+		Expect(err).To(BeNil())
+	})
+})
diff --git a/pkg/machine/qemu/machine.go b/pkg/machine/qemu/machine.go
index 2fe0230cf..616d573eb 100644
--- a/pkg/machine/qemu/machine.go
+++ b/pkg/machine/qemu/machine.go
@@ -1698,6 +1698,9 @@ func isProcessAlive(pid int) bool {
 	if err == nil || err == unix.EPERM {
 		return true
 	}
-
 	return false
 }
+
+func (p *Provider) VMType() string {
+	return vmtype
+}
diff --git a/pkg/machine/wsl/machine.go b/pkg/machine/wsl/machine.go
index 075f42cb2..6553fb6a5 100644
--- a/pkg/machine/wsl/machine.go
+++ b/pkg/machine/wsl/machine.go
@@ -1553,3 +1553,7 @@ func (p *Provider) RemoveAndCleanMachines() error {
 	}
 	return prevErr
 }
+
+func (p *Provider) VMType() string {
+	return vmtype
+}