chore: basic support for shutdown/poweroff flags

This adds basic support for shutdown/poweroff flags.
it can distringuish between halt/shutdown/reboot.

In the case of Talos halt/shutdown is same op.

Signed-off-by: Noel Georgi <git@frezbo.dev>

internal/app/machined/main.go

@@ -301,7 +301,7 @@ func main() {
 		return
 	// Azure uses the hv_utils kernel module to shutdown the node in hyper-v by calling perform_shutdown which will call orderly_poweroff which will call /sbin/poweroff.
 	case "poweroff", "shutdown":
-		poweroff.Main()
+		poweroff.Main(os.Args)
 
 		return
 	case "wrapperd":

internal/app/poweroff/main.go

@@ -9,6 +9,7 @@ import (
 	"fmt"
 	"log"
 
+	"github.com/siderolabs/gen/slices"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/credentials/insecure"
 	"google.golang.org/grpc/metadata"
@@ -19,8 +20,18 @@ import (
 	"github.com/siderolabs/talos/pkg/machinery/role"
 )
 
+// Action is the action to be performed by the poweroff command.
+type Action string
+
+const (
+	// Shutdown is the action to shutdown the machine.
+	Shutdown Action = "shutdown"
+	// Reboot is the action to reboot the machine.
+	Reboot Action = "reboot"
+)
+
 // Main is the entrypoint into /sbin/poweroff.
-func Main() {
+func Main(args []string) {
 	ctx := context.Background()
 
 	md := metadata.Pairs()
@@ -32,8 +43,35 @@ func Main() {
 		log.Fatalf(fmt.Errorf("error while creating machinery client: %w", err).Error())
 	}
 
+	switch ActionFromArgs(args) {
+	case Shutdown:
 		err = client.Shutdown(adminCtx)
 		if err != nil {
 			log.Fatalf(fmt.Errorf("error while sending shutdown command: %w", err).Error())
 		}
+	case Reboot:
+		err = client.Reboot(adminCtx)
+		if err != nil {
+			log.Fatalf(fmt.Errorf("error while sending reboot command: %w", err).Error())
+		}
+	}
+}
+
+// ActionFromArgs returns the action to be performed based on the arguments.
+func ActionFromArgs(args []string) Action {
+	if len(args) > 1 {
+		if slices.Contains(args[1:], func(s string) bool {
+			return s == "--halt" || s == "-H" || s == "--poweroff" || s == "-P" || s == "-p"
+		}) {
+			return Shutdown
+		}
+
+		if slices.Contains(args[1:], func(s string) bool {
+			return s == "--reboot" || s == "-r"
+		}) {
+			return Reboot
+		}
+	}
+
+	return Shutdown
 }

internal/app/poweroff/poweroff_test.go

@@ -0,0 +1,105 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package poweroff_test
+
+import (
+	"testing"
+
+	"github.com/siderolabs/talos/internal/app/poweroff"
+)
+
+func TestParseArgs(t *testing.T) {
+	t.Parallel()
+
+	tests := []struct {
+		name   string
+		args   []string
+		action poweroff.Action
+	}{
+		{
+			name:   "shutdown no args",
+			args:   []string{"shutdown"},
+			action: poweroff.Shutdown,
+		},
+		{
+			name:   "shutdown with reboot",
+			args:   []string{"shutdown", "-r"},
+			action: poweroff.Reboot,
+		},
+		{
+			name:   "shutdown with reboot long",
+			args:   []string{"shutdown", "--reboot"},
+			action: poweroff.Reboot,
+		},
+		{
+			name:   "shutdown with poweroff",
+			args:   []string{"shutdown", "-P"},
+			action: poweroff.Shutdown,
+		},
+		{
+			name:   "shutdown with poweroff long",
+			args:   []string{"shutdown", "--poweroff"},
+			action: poweroff.Shutdown,
+		},
+		{
+			name:   "shutdown with poweroff and reboot",
+			args:   []string{"shutdown", "-h", "-r"},
+			action: poweroff.Reboot,
+		},
+		{
+			name:   "shutdown with poweroff, reboot and timer",
+			args:   []string{"shutdown", "-h", "-r", "+0"},
+			action: poweroff.Reboot,
+		},
+		{
+			name:   "shutdown with poweroff and halt",
+			args:   []string{"shutdown", "-h", "-H"},
+			action: poweroff.Shutdown,
+		},
+		{
+			name:   "shutdown with poweroff and halt long",
+			args:   []string{"shutdown", "-h", "--halt"},
+			action: poweroff.Shutdown,
+		},
+		{
+			name:   "poweroff no args",
+			args:   []string{"poweroff"},
+			action: poweroff.Shutdown,
+		},
+		{
+			name:   "poweroff with halt",
+			args:   []string{"poweroff", "--halt"},
+			action: poweroff.Shutdown,
+		},
+		{
+			name:   "poweroff with poweroff",
+			args:   []string{"poweroff", "-p"},
+			action: poweroff.Shutdown,
+		},
+		{
+			name:   "poweroff with poweroff long",
+			args:   []string{"poweroff", "--poweroff"},
+			action: poweroff.Shutdown,
+		},
+		{
+			name:   "poweroff with reboot",
+			args:   []string{"poweroff", "--reboot"},
+			action: poweroff.Reboot,
+		},
+	}
+
+	for _, tt := range tests {
+		tt := tt
+
+		t.Run(tt.name, func(t *testing.T) {
+			t.Parallel()
+
+			action := poweroff.ActionFromArgs(tt.args)
+			if action != tt.action {
+				t.Errorf("expected %q, got %q", tt.action, action)
+			}
+		})
+	}
+}