Introduce podman machine init --root=t|f and podman machine set --root=t|f

Switch default to rootless for mac and windows

Signed-off-by: Jason T. Greene <[email protected]>

Author: n1hility

cmd/podman/machine/init.go

@@ -26,7 +26,7 @@ var (
 
 var (
 	initOpts           = machine.InitOptions{}
-	defaultMachineName = "podman-machine-default"
+	defaultMachineName = machine.DefaultMachineName
 	now                bool
 )
 
@@ -99,6 +99,9 @@ func init() {
 	IgnitionPathFlagName := "ignition-path"
 	flags.StringVar(&initOpts.IgnitionPath, IgnitionPathFlagName, "", "Path to ignition file")
 	_ = initCmd.RegisterFlagCompletionFunc(IgnitionPathFlagName, completion.AutocompleteDefault)
+
+	rootfulFlagName := "rootful"
+	flags.BoolVar(&initOpts.Rootful, rootfulFlagName, false, "Whether this machine should prefer rootful container exectution")
 }
 
 // TODO should we allow for a users to append to the qemu cmdline?

cmd/podman/machine/set.go

@@ -0,0 +1,56 @@
+// +build amd64 arm64
+
+package machine
+
+import (
+	"github.com/containers/common/pkg/completion"
+	"github.com/containers/podman/v4/cmd/podman/registry"
+	"github.com/containers/podman/v4/pkg/machine"
+	"github.com/spf13/cobra"
+)
+
+var (
+	setCmd = &cobra.Command{
+		Use:               "set [options] [NAME]",
+		Short:             "Sets a virtual machine setting",
+		Long:              "Sets an updatable virtual machine setting",
+		RunE:              setMachine,
+		Args:              cobra.MaximumNArgs(1),
+		Example:           `podman machine set --root=false`,
+		ValidArgsFunction: completion.AutocompleteNone,
+	}
+)
+
+var (
+	setOpts = machine.SetOptions{}
+)
+
+func init() {
+	registry.Commands = append(registry.Commands, registry.CliCommand{
+		Command: setCmd,
+		Parent:  machineCmd,
+	})
+	flags := setCmd.Flags()
+
+	rootfulFlagName := "rootful"
+	flags.BoolVar(&setOpts.Rootful, rootfulFlagName, false, "Whether this machine should prefer rootful container execution")
+}
+
+func setMachine(cmd *cobra.Command, args []string) error {
+	var (
+		vm  machine.VM
+		err error
+	)
+
+	vmName := defaultMachineName
+	if len(args) > 0 && len(args[0]) > 0 {
+		vmName = args[0]
+	}
+	provider := getSystemDefaultProvider()
+	vm, err = provider.LoadVMByName(vmName)
+	if err != nil {
+		return err
+	}
+
+	return vm.Set(vmName, setOpts)
+}

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

@@ -55,6 +55,14 @@ Memory (in MB).
 
 Start the virtual machine immediately after it has been initialized.
 
+#### **--rootful**=*true|false*
+
+Whether this machine should prefer rootful (`true`) or rootless (`false`)
+container execution. This option will also determine the remote connection default
+if there is no existing remote connection configurations.
+
+API forwarding, if available, will follow this setting.
+
 #### **--timezone**
 
 Set the timezone for the machine and containers.  Valid values are `local` or
@@ -84,6 +92,7 @@ Print usage statement.
 ```
 $ podman machine init
 $ podman machine init myvm
+$ podman machine init --rootful
 $ podman machine init --disk-size 50
 $ podman machine init --memory=1024 myvm
 $ podman machine init -v /Users:/mnt/Users

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

@@ -0,0 +1,59 @@
+% podman-machine-set(1)
+
+## NAME
+podman\-machine\-set - Sets a virtual machine setting
+
+## SYNOPSIS
+**podman machine set** [*options*] [*name*]
+
+## DESCRIPTION
+
+Sets an updatable virtual machine setting.
+
+Options mirror values passed to `podman machine init`. Only a limited
+subset can be changed after machine initialization.
+
+## OPTIONS
+
+#### **--rootful**=*true|false*
+
+Whether this machine should prefer rootful (`true`) or rootless (`false`)
+container execution. This option will also update the current podman
+remote connection default if it is currently pointing at the specified
+machine name (or `podman-machine-default` if no name is specified).
+
+API forwarding, if available, will follow this setting.
+
+#### **--help**
+
+Print usage statement.
+
+## EXAMPLES
+
+To switch the default VM `podman-machine-default` from rootless to rootful:
+
+```
+$ podman machine set --rootful
+```
+
+or more explicitly:
+
+```
+$ podman machine set --rootful=true
+```
+
+To switch the default VM `podman-machine-default` from rootful to rootless:
+```
+$ podman machine set --rootful=false
+```
+
+To switch the VM `myvm` from rootless to rootful:
+```
+$ podman machine set --rootful myvm
+```
+
+## SEE ALSO
+**[podman(1)](podman.1.md)**, **[podman-machine(1)](podman-machine.1.md)**
+
+## HISTORY
+February 2022, Originally compiled by Jason Greene <[email protected]>

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

@@ -16,6 +16,7 @@ podman\-machine - Manage Podman's virtual machine
 | init    | [podman-machine-init(1)](podman-machine-init.1.md)      | Initialize a new virtual machine  |
 | list    | [podman-machine-list(1)](podman-machine-list.1.md)      | List virtual machines             |
 | rm      | [podman-machine-rm(1)](podman-machine-rm.1.md)          | Remove a virtual machine          |
+| set     | [podman-machine-set(1)](podman-machine-set.1.md)        | Sets a virtual machine setting    |
 | 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            |

pkg/machine/config.go

@@ -27,6 +27,7 @@ type InitOptions struct {
 	URI          url.URL
 	Username     string
 	ReExec       bool
+	Rootful      bool
 }
 
 type QemuMachineStatus = string
@@ -35,7 +36,8 @@ const (
 	// Running indicates the qemu vm is running
 	Running QemuMachineStatus = "running"
 	//	Stopped indicates the vm has stopped
-	Stopped QemuMachineStatus = "stopped"
+	Stopped            QemuMachineStatus = "stopped"
+	DefaultMachineName string            = "podman-machine-default"
 )
 
 type Provider interface {
@@ -89,6 +91,10 @@ type ListResponse struct {
 	IdentityPath   string
 }
 
+type SetOptions struct {
+	Rootful bool
+}
+
 type SSHOptions struct {
 	Username string
 	Args     []string
@@ -107,6 +113,7 @@ type RemoveOptions struct {
 type VM interface {
 	Init(opts InitOptions) (bool, error)
 	Remove(name string, opts RemoveOptions) (string, func() error, error)
+	Set(name string, opts SetOptions) error
 	SSH(name string, opts SSHOptions) error
 	Start(name string, opts StartOptions) error
 	Stop(name string, opts StopOptions) error

pkg/machine/connection.go

@@ -39,6 +39,31 @@ func AddConnection(uri fmt.Stringer, name, identity string, isDefault bool) erro
 	return cfg.Write()
 }
 
+func AnyConnectionDefault(name ...string) (bool, error) {
+	cfg, err := config.ReadCustomConfig()
+	if err != nil {
+		return false, err
+	}
+	for _, n := range name {
+		if n == cfg.Engine.ActiveService {
+			return true, nil
+		}
+	}
+
+	return false, nil
+}
+
+func ChangeDefault(name string) error {
+	cfg, err := config.ReadCustomConfig()
+	if err != nil {
+		return err
+	}
+
+	cfg.Engine.ActiveService = name
+
+	return cfg.Write()
+}
+
 func RemoveConnection(name string) error {
 	cfg, err := config.ReadCustomConfig()
 	if err != nil {

pkg/machine/qemu/config.go

@@ -33,6 +33,8 @@ type MachineVM struct {
 	QMPMonitor Monitor
 	// RemoteUsername of the vm user
 	RemoteUsername string
+	// Whether this machine should run in a rootful or rootless manner
+	Rootful bool
 }
 
 type Mount struct {