chore: handle documents diff in apply-config dry run

Before this PR diff generator only diffed the v1alpha1 config and nothing else. With this PR it also takes
separate docs into the account.

```shell
~ > <editor> controlplane.yaml
~ > talosctl -n talos-default-controlplane-1  apply-config --file controlplane.yaml --dry-run
Dry run summary:
Applied configuration without a reboot (skipped in dry-run).
Config diff:
No changes.
Documents diff:
[]config.Document{
+	&runtime.KmsgLogV1Alpha1{
+		Meta:       meta.Meta{MetaAPIVersion: "v1alpha1", MetaKind: "KmsgLogConfig"},
+		MetaName:   "omni-kmsg",
+		KmsgLogURL: s"tcp://[fdae:41e4:649b:9303::1]:8092",
+	},
}
~ > talosctl -n talos-default-controlplane-1  apply-config --file controlplane.yaml
Applied configuration without a reboot
~ >
~ >
~ >
~ > <editor> controlplane.yaml
~ > talosctl -n talos-default-controlplane-1  apply-config --file controlplane.yaml --dry-run
Dry run summary:
Applied configuration without a reboot (skipped in dry-run).
Config diff:
No changes.
Documents diff:
[]config.Document{
	&runtime.KmsgLogV1Alpha1{Meta: {MetaAPIVersion: "v1alpha1", MetaKind: "KmsgLogConfig"}, MetaName: "omni-kmsg", KmsgLogURL: {URL: &{Scheme: "tcp", Host: "[fdae:41e4:649b:9303::1]:8092"}}},
+	&network.DefaultActionConfigV1Alpha1{
+		Meta:    meta.Meta{MetaAPIVersion: "v1alpha1", MetaKind: "NetworkDefaultActionConfig"},
+		Ingress: s"block",
+	},
}
```

Closes #8885

Signed-off-by: Dmitriy Matrenichev <dmitry.matrenichev@siderolabs.com>

cmd/talosctl/cmd/talos/apply-config.go

@@ -43,7 +43,7 @@ var applyConfigCmd = &cobra.Command{
 	RunE: func(cmd *cobra.Command, args []string) error {
 		var (
 			cfgBytes []byte
-			e        error
+			err      error
 		)
 
 		if len(args) > 0 {
@@ -59,9 +59,9 @@ var applyConfigCmd = &cobra.Command{
 		}
 
 		if applyConfigCmdFlags.filename != "" {
-			cfgBytes, e = os.ReadFile(applyConfigCmdFlags.filename)
+			cfgBytes, err = os.ReadFile(applyConfigCmdFlags.filename)
-			if e != nil {
+			if err != nil {
-				return fmt.Errorf("failed to read configuration from %q: %w", applyConfigCmdFlags.filename, e)
+				return fmt.Errorf("failed to read configuration from %q: %w", applyConfigCmdFlags.filename, err)
 			}
 
 			if len(cfgBytes) < 1 {
@@ -74,19 +74,19 @@ var applyConfigCmd = &cobra.Command{
 					patches []configpatcher.Patch
 				)
 
-				patches, e = configpatcher.LoadPatches(applyConfigCmdFlags.patches)
+				patches, err = configpatcher.LoadPatches(applyConfigCmdFlags.patches)
-				if e != nil {
+				if err != nil {
-					return e
+					return err
 				}
 
-				cfg, e = configpatcher.Apply(configpatcher.WithBytes(cfgBytes), patches)
+				cfg, err = configpatcher.Apply(configpatcher.WithBytes(cfgBytes), patches)
-				if e != nil {
+				if err != nil {
-					return e
+					return err
 				}
 
-				cfgBytes, e = cfg.Bytes()
+				cfgBytes, err = cfg.Bytes()
-				if e != nil {
+				if err != nil {
-					return e
+					return err
 				}
 			}
 		} else if applyConfigCmdFlags.Mode.Mode != helpers.InteractiveMode {
@@ -108,8 +108,10 @@ var applyConfigCmd = &cobra.Command{
 
 				if len(GlobalArgs.Endpoints) > 0 {
 					return WithClientNoNodes(func(bootstrapCtx context.Context, bootstrapClient *client.Client) error {
-						opts := []installer.Option{}
+						opts := []installer.Option{
-						opts = append(opts, installer.WithBootstrapNode(bootstrapCtx, bootstrapClient, GlobalArgs.Endpoints[0]), installer.WithDryRun(applyConfigCmdFlags.dryRun))
+							installer.WithBootstrapNode(bootstrapCtx, bootstrapClient, GlobalArgs.Endpoints[0]),
+							installer.WithDryRun(applyConfigCmdFlags.dryRun),
+						}
 
 						conn, err := installer.NewConnection(
 							ctx,

internal/app/machined/internal/server/v1alpha1/v1alpha1_server.go

@@ -8,6 +8,7 @@ import (
 	"archive/tar"
 	"bufio"
 	"bytes"
+	stdcmp "cmp"
 	"compress/gzip"
 	"context"
 	"encoding/json"
@@ -76,6 +77,8 @@ import (
 	"github.com/siderolabs/talos/pkg/machinery/api/storage"
 	timeapi "github.com/siderolabs/talos/pkg/machinery/api/time"
 	clientconfig "github.com/siderolabs/talos/pkg/machinery/client/config"
+	"github.com/siderolabs/talos/pkg/machinery/config"
+	docscfg "github.com/siderolabs/talos/pkg/machinery/config/config"
 	"github.com/siderolabs/talos/pkg/machinery/config/configloader"
 	"github.com/siderolabs/talos/pkg/machinery/config/generate/secrets"
 	machinetype "github.com/siderolabs/talos/pkg/machinery/config/machine"
@@ -218,15 +221,7 @@ func (s *Server) ApplyConfiguration(ctx context.Context, in *machine.ApplyConfig
 	}
 
 	if in.DryRun {
-		var config interface{}
+		details := generateDiff(s.Controller.Runtime(), cfgProvider)
-		if s.Controller.Runtime().Config() != nil {
-			config = s.Controller.Runtime().ConfigContainer().RawV1Alpha1()
-		}
-
-		diff := cmp.Diff(config, cfgProvider.RawV1Alpha1(), cmp.AllowUnexported(v1alpha1.InstallDiskSizeMatcher{}))
-		if diff == "" {
-			diff = "No changes."
-		}
 
 		return &machine.ApplyConfigurationResponse{
 			Messages: []*machine.ApplyConfiguration{
@@ -234,8 +229,7 @@ func (s *Server) ApplyConfiguration(ctx context.Context, in *machine.ApplyConfig
 					Mode: in.Mode,
 					ModeDetails: fmt.Sprintf(`Dry run summary:
 %s (skipped in dry-run).
-Config diff:
+%s`, modeDetails, details),
-%s`, modeDetails, diff),
 				},
 			},
 		}, nil
@@ -301,6 +295,35 @@ Config diff:
 	}, nil
 }
 
+func generateDiff(r runtime.Runtime, provider config.Provider) string {
+	var cfg *v1alpha1.Config
+
+	if r.Config() != nil {
+		cfg = r.ConfigContainer().RawV1Alpha1()
+	}
+
+	v1alpha1Diff := cmp.Diff(cfg, provider.RawV1Alpha1(), cmp.AllowUnexported(v1alpha1.InstallDiskSizeMatcher{}))
+	if v1alpha1Diff == "" {
+		v1alpha1Diff = "No changes."
+	}
+
+	origDocs := slices.DeleteFunc(r.ConfigContainer().Documents(), func(doc docscfg.Document) bool { return doc.Kind() == v1alpha1.Version })
+	newDocs := slices.DeleteFunc(provider.Documents(), func(doc docscfg.Document) bool { return doc.Kind() == v1alpha1.Version })
+
+	slices.SortStableFunc(origDocs, func(a, b docscfg.Document) int { return stdcmp.Compare(a.Kind(), b.Kind()) })
+	slices.SortStableFunc(newDocs, func(a, b docscfg.Document) int { return stdcmp.Compare(a.Kind(), b.Kind()) })
+
+	documentsDiff := cmp.Diff(origDocs, newDocs)
+	if documentsDiff == "" {
+		documentsDiff = "No changes."
+	}
+
+	return fmt.Sprintf(`Config diff:
+%s
+Documents diff:
+%s`, v1alpha1Diff, documentsDiff)
+}
+
 // GenerateConfiguration implements the machine.MachineServer interface.
 func (s *Server) GenerateConfiguration(ctx context.Context, in *machine.GenerateConfigurationRequest) (reply *machine.GenerateConfigurationResponse, err error) {
 	if s.Controller.Runtime().Config().Machine().Type() == machinetype.TypeWorker {

internal/integration/api/apply-config.go

@@ -8,12 +8,14 @@ package api
 
 import (
 	"context"
+	"net/url"
 	"os"
-	"sort"
+	"slices"
 	"testing"
 	"time"
 
 	"github.com/cosi-project/runtime/pkg/safe"
+	"github.com/siderolabs/gen/ensure"
 	"github.com/siderolabs/go-pointer"
 	"github.com/siderolabs/go-retry/retry"
 	"google.golang.org/grpc/codes"
@@ -23,7 +25,9 @@ import (
 	machineapi "github.com/siderolabs/talos/pkg/machinery/api/machine"
 	"github.com/siderolabs/talos/pkg/machinery/client"
 	"github.com/siderolabs/talos/pkg/machinery/config"
+	"github.com/siderolabs/talos/pkg/machinery/config/container"
 	"github.com/siderolabs/talos/pkg/machinery/config/machine"
+	"github.com/siderolabs/talos/pkg/machinery/config/types/runtime"
 	"github.com/siderolabs/talos/pkg/machinery/config/types/v1alpha1"
 	"github.com/siderolabs/talos/pkg/machinery/constants"
 	mc "github.com/siderolabs/talos/pkg/machinery/resources/config"
@@ -88,14 +92,13 @@ func (suite *ApplyConfigSuite) TestApply() {
 
 	suite.WaitForBootDone(suite.ctx)
 
-	sort.Strings(nodes)
+	slices.Sort(nodes)
 
 	node := nodes[0]
-
 	nodeCtx := client.WithNode(suite.ctx, node)
 
 	provider, err := suite.ReadConfigFromNode(nodeCtx)
-	suite.Assert().Nilf(err, "failed to read existing config from node %q: %w", node, err)
+	suite.Assert().NoErrorf(err, "failed to read existing config from node %q: %w", node, err)
 
 	cfgDataOut := suite.PatchV1Alpha1Config(provider, func(cfg *v1alpha1.Config) {
 		if cfg.MachineConfig.MachineSysctls == nil {
@@ -115,7 +118,7 @@ func (suite *ApplyConfigSuite) TestApply() {
 			)
 			if err != nil {
 				// It is expected that the connection will EOF here, so just log the error
-				suite.Assert().Nilf(err, "failed to apply configuration (node %q): %w", node, err)
+				suite.Assert().NoErrorf(err, "failed to apply configuration (node %q): %w", node, err)
 			}
 
 			return nil
@@ -125,7 +128,7 @@ func (suite *ApplyConfigSuite) TestApply() {
 	// Verify configuration change
 	var newProvider config.Provider
 
-	suite.Require().Nilf(
+	suite.Require().NoErrorf(
 		retry.Constant(time.Minute, retry.WithUnits(time.Second)).Retry(
 			func() error {
 				newProvider, err = suite.ReadConfigFromNode(nodeCtx)
@@ -300,7 +303,7 @@ func (suite *ApplyConfigSuite) TestApplyConfigRotateEncryptionSecrets() {
 				)
 				if err != nil {
 					// It is expected that the connection will EOF here, so just log the error
-					suite.Assert().Nilf(err, "failed to apply configuration (node %q): %w", node, err)
+					suite.Assert().Errorf(err, "failed to apply configuration (node %q): %w", node, err)
 				}
 
 				return nil
@@ -312,7 +315,7 @@ func (suite *ApplyConfigSuite) TestApplyConfigRotateEncryptionSecrets() {
 		// Verify configuration change
 		var newProvider config.Provider
 
-		suite.Require().Nilf(
+		suite.Require().Errorf(
 			retry.Constant(time.Minute, retry.WithUnits(time.Second)).Retry(
 				func() error {
 					newProvider, err = suite.ReadConfigFromNode(nodeCtx)
@@ -355,14 +358,13 @@ func (suite *ApplyConfigSuite) TestApplyNoReboot() {
 
 	suite.WaitForBootDone(suite.ctx)
 
-	sort.Strings(nodes)
+	slices.Sort(nodes)
 
 	node := nodes[0]
-
 	nodeCtx := client.WithNode(suite.ctx, node)
 
 	provider, err := suite.ReadConfigFromNode(nodeCtx)
-	suite.Require().Nilf(err, "failed to read existing config from node %q: %s", node, err)
+	suite.Require().NoErrorf(err, "failed to read existing config from node %q: %s", node, err)
 
 	cfgDataOut := suite.PatchV1Alpha1Config(provider, func(cfg *v1alpha1.Config) {
 		// this won't be possible without a reboot
@@ -387,14 +389,13 @@ func (suite *ApplyConfigSuite) TestApplyDryRun() {
 
 	suite.WaitForBootDone(suite.ctx)
 
-	sort.Strings(nodes)
+	slices.Sort(nodes)
 
 	node := nodes[0]
-
 	nodeCtx := client.WithNode(suite.ctx, node)
 
 	provider, err := suite.ReadConfigFromNode(nodeCtx)
-	suite.Require().Nilf(err, "failed to read existing config from node %q: %s", node, err)
+	suite.Require().NoErrorf(err, "failed to read existing config from node %q: %s", node, err)
 
 	cfgDataOut := suite.PatchV1Alpha1Config(provider, func(cfg *v1alpha1.Config) {
 		// this won't be possible without a reboot
@@ -416,10 +417,49 @@ func (suite *ApplyConfigSuite) TestApplyDryRun() {
 		},
 	)
 
-	suite.Require().Nilf(err, "failed to apply configuration (node %q): %s", node, err)
+	suite.Require().NoErrorf(err, "failed to apply configuration (node %q): %s", node, err)
 	suite.Assert().Contains(reply.Messages[0].ModeDetails, "Dry run summary")
 }
 
+// TestApplyDryRunDocuments verifies the apply config API with multi doc and dry run enabled.
+func (suite *ApplyConfigSuite) TestApplyDryRunDocuments() {
+	nodes := suite.DiscoverNodeInternalIPsByType(suite.ctx, machine.TypeWorker)
+	suite.Require().NotEmpty(nodes)
+
+	suite.WaitForBootDone(suite.ctx)
+
+	slices.Sort(nodes)
+
+	node := nodes[0]
+	nodeCtx := client.WithNode(suite.ctx, node)
+
+	provider, err := suite.ReadConfigFromNode(nodeCtx)
+	suite.Require().NoErrorf(err, "failed to read existing config from node %q: %s", node, err)
+
+	kmsg := runtime.NewKmsgLogV1Alpha1()
+	kmsg.MetaName = "omni-kmsg"
+	kmsg.KmsgLogURL.URL = ensure.Value(url.Parse("tcp://[fdae:41e4:649b:9303::1]:8092"))
+
+	cont, err := container.New(provider.RawV1Alpha1(), kmsg)
+	suite.Require().NoErrorf(err, "failed to create container: %s", err)
+
+	cfgDataOut, err := cont.Bytes()
+	suite.Require().NoErrorf(err, "failed to marshal container: %s", err)
+
+	reply, err := suite.Client.ApplyConfiguration(
+		nodeCtx, &machineapi.ApplyConfigurationRequest{
+			Data:   cfgDataOut,
+			Mode:   machineapi.ApplyConfigurationRequest_AUTO,
+			DryRun: true,
+		},
+	)
+
+	suite.Require().NoErrorf(err, "failed to apply configuration (node %q): %s", node, err)
+	suite.Assert().Contains(reply.Messages[0].ModeDetails, "Dry run summary")
+	suite.Assert().Contains(reply.Messages[0].ModeDetails, "omni-kmsg")
+	suite.Assert().Contains(reply.Messages[0].ModeDetails, "tcp://[fdae:41e4:649b:9303::1]:8092")
+}
+
 // TestApplyTry applies the config in try mode with a short timeout.
 func (suite *ApplyConfigSuite) TestApplyTry() {
 	nodes := suite.DiscoverNodeInternalIPsByType(suite.ctx, machine.TypeWorker)
@@ -427,10 +467,9 @@ func (suite *ApplyConfigSuite) TestApplyTry() {
 
 	suite.WaitForBootDone(suite.ctx)
 
-	sort.Strings(nodes)
+	slices.Sort(nodes)
 
 	node := nodes[0]
-
 	nodeCtx := client.WithNode(suite.ctx, node)
 
 	getMachineConfig := func(ctx context.Context) (*mc.MachineConfig, error) {
@@ -443,7 +482,7 @@ func (suite *ApplyConfigSuite) TestApplyTry() {
 	}
 
 	provider, err := getMachineConfig(nodeCtx)
-	suite.Require().Nilf(err, "failed to read existing config from node %q: %s", node, err)
+	suite.Require().NoErrorf(err, "failed to read existing config from node %q: %s", node, err)
 
 	cfgDataOut := suite.PatchV1Alpha1Config(provider.Provider(), func(cfg *v1alpha1.Config) {
 		if cfg.MachineConfig.MachineNetwork == nil {
@@ -465,10 +504,10 @@ func (suite *ApplyConfigSuite) TestApplyTry() {
 			TryModeTimeout: durationpb.New(time.Second * 1),
 		},
 	)
-	suite.Assert().Nilf(err, "failed to apply configuration (node %q): %s", node, err)
+	suite.Assert().NoErrorf(err, "failed to apply configuration (node %q): %s", node, err)
 
 	provider, err = getMachineConfig(nodeCtx)
-	suite.Require().Nilf(err, "failed to read existing config from node %q: %w", node, err)
+	suite.Require().NoErrorf(err, "failed to read existing config from node %q: %w", node, err)
 
 	suite.Assert().NotNil(provider.Config().Machine().Network())
 	suite.Assert().NotNil(provider.Config().Machine().Network().Devices())
@@ -487,7 +526,7 @@ func (suite *ApplyConfigSuite) TestApplyTry() {
 
 	for range 100 {
 		provider, err = getMachineConfig(nodeCtx)
-		suite.Assert().Nilf(err, "failed to read existing config from node %q: %s", node, err)
+		suite.Assert().NoErrorf(err, "failed to read existing config from node %q: %s", node, err)
 
 		if provider.Config().Machine().Network() == nil {
 			return