Add podman machine restart subcommand

Author: jaitjacob

cmd/podman/machine/restart.go

@@ -0,0 +1,57 @@
+//go:build amd64 || arm64
+
+package machine
+
+import (
+	"fmt"
+
+	"github.com/spf13/cobra"
+	"go.podman.io/podman/v6/cmd/podman/registry"
+	"go.podman.io/podman/v6/libpod/events"
+	"go.podman.io/podman/v6/pkg/machine"
+	"go.podman.io/podman/v6/pkg/machine/shim"
+)
+
+var restartCmd = &cobra.Command{
+	Use:               "restart [MACHINE]",
+	Short:             "Restart an existing machine",
+	Long:              "Restart a managed virtual machine",
+	PersistentPreRunE: machinePreRunE,
+	RunE:              restart,
+	Args:              cobra.MaximumNArgs(1),
+	Example:           `podman machine restart podman-machine-default`,
+	ValidArgsFunction: AutocompleteMachine,
+}
+
+func init() {
+	registry.Commands = append(registry.Commands, registry.CliCommand{
+		Command: restartCmd,
+		Parent:  machineCmd,
+	})
+}
+
+func restart(_ *cobra.Command, args []string) error {
+	vmName := defaultMachineName
+	if len(args) > 0 && len(args[0]) > 0 {
+		vmName = args[0]
+	}
+
+	mc, vmProvider, err := shim.VMExists(vmName)
+	if err != nil {
+		return err
+	}
+
+	if err := shim.Stop(mc, vmProvider, false); err != nil {
+		return err
+	}
+
+	fmt.Printf("Machine %q stopped successfully\n", vmName)
+	newMachineEvent(events.Stop, events.Event{Name: vmName})
+
+	if err := shim.Start(mc, vmProvider, machine.StartOptions{}, nil); err != nil {
+		return err
+	}
+	fmt.Printf("Machine %q started successfully\n", vmName)
+	newMachineEvent(events.Start, events.Event{Name: vmName})
+	return nil
+}

docs/source/markdown/podman-machine-restart.1.md

@@ -0,0 +1,38 @@
+% podman-machine-restart 1
+
+## NAME
+podman\-machine\-restart - Restart a virtual machine
+
+## SYNOPSIS
+**podman machine restart** [*name*]
+
+## DESCRIPTION
+
+Restarts a virtual machine for Podman.
+
+The default machine name is `podman-machine-default`. If a machine name is not specified as an argument,
+then `podman-machine-default` will be restarted.
+
+Stopping an already stopped vm is not considered an error so running restart on a stopped vm just
+starts it from a stopped state.
+
+**podman machine restart** stops and then starts a Linux virtual machine where containers are run.
+
+## OPTIONS
+
+#### **--help**
+
+Print usage statement.
+
+## EXAMPLES
+
+Restart a podman machine named myvm.
+```
+$ podman machine restart myvm
+```
+
+## SEE ALSO
+**[podman(1)](podman.1.md)**, **[podman-machine(1)](podman-machine.1.md)**
+
+## HISTORY
+March 2021, Originally compiled by Ashley Cui <acui@redhat.com>

docs/source/markdown/podman-machine.1.md

@@ -49,6 +49,7 @@ supported by platform.  The asterisk denotes the default provider for the platfo
 | ssh     | [podman-machine-ssh(1)](podman-machine-ssh.1.md)         | SSH into a virtual machine                                      |
 | start   | [podman-machine-start(1)](podman-machine-start.1.md)     | Start a virtual machine                                         |
 | stop    | [podman-machine-stop(1)](podman-machine-stop.1.md)       | Stop a virtual machine                                          |
+| restart | [podman-machine-restart(1)](podman-machine-restart.1.md) | Restart a virtual machine                                       |
 
 ## SEE ALSO
 **[podman(1)](podman.1.md)**, **[podman-machine-cp(1)](podman-machine-cp.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-os(1)](podman-machine-os.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-machine-reset(1)](podman-machine-reset.1.md)**, **[containers.conf(5)](https://github.com/containers/container-libs/blob/main/common/docs/containers.conf.5.md)**