fix: correctly add console args for ttyS0

The previous code didn't work, as it was manipulating args before they
were reset by the platform.

Also it was producing wrong order of console args.

Both fixed, plus a unit-test.

Signed-off-by: Andrey Smirnov <andrey.smirnov@siderolabs.com>

pkg/imager/imager.go

@@ -336,16 +336,19 @@ func (i *Imager) buildCmdline() error {
 	// platform kernel args
 	cmdline.Append(constants.KernelParamPlatform, p.Name())
 
+	cmdline.SetAll(p.KernelArgs(i.prof.Arch).Strings())
+
 	if quirks.New(i.prof.Version).SupportsHaltIfInstalled() && i.prof.Output.Kind == profile.OutKindISO {
 		cmdline.Append(constants.KernelParamHaltIfInstalled, "1")
 	}
 
-	if quirks.New(i.prof.Version).SupportsMetalPlatformConsoleTTYS0() && i.prof.Platform == constants.PlatformMetal {
+	if quirks.New(i.prof.Version).SupportsMetalPlatformConsoleTTYS0() && i.prof.Platform == constants.PlatformMetal && i.prof.Arch == "amd64" {
+		// Talos 1.8+ drops ttyS0 console for metal, restore previous args
+		cmdline.DeleteAll("console")
 		cmdline.Append("console", "ttyS0")
+		cmdline.Append("console", "tty0")
 	}
 
-	cmdline.SetAll(p.KernelArgs(i.prof.Arch).Strings())
-
 	// board kernel args
 	if i.prof.Board != "" && !quirks.New(i.prof.Version).SupportsOverlay() {
 		var b talosruntime.Board

pkg/imager/imager_test.go

@@ -0,0 +1,112 @@
+// 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 imager_test
+
+import (
+	"context"
+	"os"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"github.com/siderolabs/talos/pkg/imager"
+	"github.com/siderolabs/talos/pkg/imager/profile"
+	"github.com/siderolabs/talos/pkg/reporter"
+)
+
+func TestImager(t *testing.T) {
+	t.Parallel()
+
+	for _, test := range []struct {
+		name string
+
+		prof profile.Profile
+
+		expected string
+	}{
+		{
+			name: "cmdline-pre1.8-amd64",
+
+			prof: profile.Profile{
+				BaseProfileName: "metal",
+				Arch:            "amd64",
+				Output: profile.Output{
+					Kind:      profile.OutKindCmdline,
+					OutFormat: profile.OutFormatRaw,
+				},
+				Version: "1.7.0",
+			},
+
+			expected: "talos.platform=metal console=ttyS0 console=tty0 init_on_alloc=1 slab_nomerge pti=on consoleblank=0 nvme_core.io_timeout=4294967295 printk.devkmsg=on ima_template=ima-ng ima_appraise=fix ima_hash=sha512", //nolint:lll
+		},
+		{
+			name: "cmdline-pre1.8-arm64",
+
+			prof: profile.Profile{
+				BaseProfileName: "metal",
+				Arch:            "arm64",
+				Output: profile.Output{
+					Kind:      profile.OutKindCmdline,
+					OutFormat: profile.OutFormatRaw,
+				},
+				Version: "1.7.0",
+			},
+
+			expected: "talos.platform=metal console=ttyAMA0 console=tty0 init_on_alloc=1 slab_nomerge pti=on consoleblank=0 nvme_core.io_timeout=4294967295 printk.devkmsg=on ima_template=ima-ng ima_appraise=fix ima_hash=sha512", //nolint:lll
+		},
+		{
+			name: "cmdline-1.8-amd64",
+
+			prof: profile.Profile{
+				BaseProfileName: "metal",
+				Arch:            "amd64",
+				Output: profile.Output{
+					Kind:      profile.OutKindCmdline,
+					OutFormat: profile.OutFormatRaw,
+				},
+				Version: "1.8.0",
+			},
+
+			expected: "talos.platform=metal console=tty0 init_on_alloc=1 slab_nomerge pti=on consoleblank=0 nvme_core.io_timeout=4294967295 printk.devkmsg=on ima_template=ima-ng ima_appraise=fix ima_hash=sha512", //nolint:lll
+		},
+		{
+			name: "cmdline-1.8-arm64",
+
+			prof: profile.Profile{
+				BaseProfileName: "metal",
+				Arch:            "arm64",
+				Output: profile.Output{
+					Kind:      profile.OutKindCmdline,
+					OutFormat: profile.OutFormatRaw,
+				},
+				Version: "1.8.0",
+			},
+
+			expected: "talos.platform=metal console=ttyAMA0 console=tty0 init_on_alloc=1 slab_nomerge pti=on consoleblank=0 nvme_core.io_timeout=4294967295 printk.devkmsg=on ima_template=ima-ng ima_appraise=fix ima_hash=sha512", //nolint:lll
+		},
+	} {
+		t.Run(test.name, func(t *testing.T) {
+			t.Parallel()
+
+			ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+			t.Cleanup(cancel)
+
+			imgr, err := imager.New(test.prof)
+			require.NoError(t, err)
+
+			outPath := t.TempDir()
+
+			outputPath, err := imgr.Execute(ctx, outPath, reporter.New())
+			require.NoError(t, err)
+
+			out, err := os.ReadFile(outputPath)
+			require.NoError(t, err)
+
+			assert.Equal(t, test.expected, string(out))
+		})
+	}
+}