Added debug check command to check if a combination of board/programmer supports debugging.

arduino/cores/fqbn.go

@@ -30,6 +30,16 @@ type FQBN struct {
 	Configs      *properties.Map
 }
 
+// MustParseFQBN extract an FQBN object from the input string
+// or panics if the input is not a valid FQBN.
+func MustParseFQBN(fqbnIn string) *FQBN {
+	res, err := ParseFQBN(fqbnIn)
+	if err != nil {
+		panic(err)
+	}
+	return res
+}
+
 // ParseFQBN extract an FQBN object from the input string
 func ParseFQBN(fqbnIn string) (*FQBN, error) {
 	// Split fqbn

commands/daemon/debug.go

@@ -66,3 +66,9 @@ func (s *ArduinoCoreServerImpl) GetDebugConfig(ctx context.Context, req *rpc.Get
 	res, err := cmd.GetDebugConfig(ctx, req)
 	return res, convertErrorToRPCStatus(err)
 }
+
+// IsDebugSupported checks if debugging is supported for a given configuration
+func (s *ArduinoCoreServerImpl) IsDebugSupported(ctx context.Context, req *rpc.IsDebugSupportedRequest) (*rpc.IsDebugSupportedResponse, error) {
+	res, err := cmd.IsDebugSupported(ctx, req)
+	return res, convertErrorToRPCStatus(err)
+}

commands/debug/debug.go

@@ -118,7 +118,7 @@ func Debug(ctx context.Context, req *rpc.GetDebugConfigRequest, inStream io.Read
 
 // getCommandLine compose a debug command represented by a core recipe
 func getCommandLine(req *rpc.GetDebugConfigRequest, pme *packagemanager.Explorer) ([]string, error) {
-	debugInfo, err := getDebugProperties(req, pme)
+	debugInfo, err := getDebugProperties(req, pme, false)
 	if err != nil {
 		return nil, err
 	}

commands/debug/debug_info.go

@@ -18,6 +18,8 @@ package debug
 import (
 	"context"
 	"encoding/json"
+	"errors"
+	"reflect"
 	"slices"
 	"strconv"
 	"strings"
@@ -41,25 +43,83 @@ func GetDebugConfig(ctx context.Context, req *rpc.GetDebugConfigRequest) (*rpc.G
 		return nil, &arduino.InvalidInstanceError{}
 	}
 	defer release()
-	return getDebugProperties(req, pme)
+	return getDebugProperties(req, pme, false)
 }
 
-func getDebugProperties(req *rpc.GetDebugConfigRequest, pme *packagemanager.Explorer) (*rpc.GetDebugConfigResponse, error) {
-	// TODO: make a generic function to extract sketch from request
-	// and remove duplication in commands/compile.go
-	if req.GetSketchPath() == "" {
-		return nil, &arduino.MissingSketchPathError{}
+// IsDebugSupported checks if the given board/programmer configuration supports debugging.
+func IsDebugSupported(ctx context.Context, req *rpc.IsDebugSupportedRequest) (*rpc.IsDebugSupportedResponse, error) {
+	pme, release := instances.GetPackageManagerExplorer(req.GetInstance())
+	if pme == nil {
+		return nil, &arduino.InvalidInstanceError{}
+	}
+	defer release()
+	configRequest := &rpc.GetDebugConfigRequest{
+		Instance:    req.GetInstance(),
+		Fqbn:        req.GetFqbn(),
+		SketchPath:  "",
+		Port:        req.GetPort(),
+		Interpreter: req.GetInterpreter(),
+		ImportDir:   "",
+		Programmer:  req.GetProgrammer(),
+	}
+	expectedOutput, err := getDebugProperties(configRequest, pme, true)
+	var x *arduino.FailedDebugError
+	if errors.As(err, &x) {
+		return &rpc.IsDebugSupportedResponse{DebuggingSupported: false}, nil
 	}
-	sketchPath := paths.New(req.GetSketchPath())
-	sk, err := sketch.New(sketchPath)
 	if err != nil {
-		return nil, &arduino.CantOpenSketchError{Cause: err}
+		return nil, err
+	}
+
+	// Compute the minimum FQBN required to get the same debug configuration.
+	// (i.e. the FQBN cleaned up of the options that do not affect the debugger configuration)
+	minimumFQBN := cores.MustParseFQBN(req.GetFqbn())
+	for _, config := range minimumFQBN.Configs.Keys() {
+		checkFQBN := minimumFQBN.Clone()
+		checkFQBN.Configs.Remove(config)
+		configRequest.Fqbn = checkFQBN.String()
+		checkOutput, err := getDebugProperties(configRequest, pme, true)
+		if err == nil && reflect.DeepEqual(expectedOutput, checkOutput) {
+			minimumFQBN.Configs.Remove(config)
+		}
+	}
+	return &rpc.IsDebugSupportedResponse{
+		DebuggingSupported: true,
+		DebugFqbn:          minimumFQBN.String(),
+	}, nil
+}
+
+func getDebugProperties(req *rpc.GetDebugConfigRequest, pme *packagemanager.Explorer, skipSketchChecks bool) (*rpc.GetDebugConfigResponse, error) {
+	var (
+		sketchName             string
+		sketchDefaultFQBN      string
+		sketchDefaultBuildPath *paths.Path
+	)
+	if !skipSketchChecks {
+		// TODO: make a generic function to extract sketch from request
+		// and remove duplication in commands/compile.go
+		if req.GetSketchPath() == "" {
+			return nil, &arduino.MissingSketchPathError{}
+		}
+		sketchPath := paths.New(req.GetSketchPath())
+		sk, err := sketch.New(sketchPath)
+		if err != nil {
+			return nil, &arduino.CantOpenSketchError{Cause: err}
+		}
+		sketchName = sk.Name
+		sketchDefaultFQBN = sk.GetDefaultFQBN()
+		sketchDefaultBuildPath = sk.DefaultBuildPath()
+	} else {
+		// Use placeholder sketch data
+		sketchName = "Sketch"
+		sketchDefaultFQBN = ""
+		sketchDefaultBuildPath = paths.New("SketchBuildPath")
 	}
 
 	// XXX Remove this code duplication!!
 	fqbnIn := req.GetFqbn()
-	if fqbnIn == "" && sk != nil {
-		fqbnIn = sk.GetDefaultFQBN()
+	if fqbnIn == "" {
+		fqbnIn = sketchDefaultFQBN
 	}
 	if fqbnIn == "" {
 		return nil, &arduino.MissingFQBNError{}
@@ -109,16 +169,18 @@ func getDebugProperties(req *rpc.GetDebugConfigRequest, pme *packagemanager.Expl
 	if importDir := req.GetImportDir(); importDir != "" {
 		importPath = paths.New(importDir)
 	} else {
-		importPath = sk.DefaultBuildPath()
-	}
-	if !importPath.Exist() {
-		return nil, &arduino.NotFoundError{Message: tr("Compiled sketch not found in %s", importPath)}
+		importPath = sketchDefaultBuildPath
 	}
-	if !importPath.IsDir() {
-		return nil, &arduino.NotFoundError{Message: tr("Expected compiled sketch in directory %s, but is a file instead", importPath)}
+	if !skipSketchChecks {
+		if !importPath.Exist() {
+			return nil, &arduino.NotFoundError{Message: tr("Compiled sketch not found in %s", importPath)}
+		}
+		if !importPath.IsDir() {
+			return nil, &arduino.NotFoundError{Message: tr("Expected compiled sketch in directory %s, but is a file instead", importPath)}
+		}
 	}
 	toolProperties.SetPath("build.path", importPath)
-	toolProperties.Set("build.project_name", sk.Name+".ino")
+	toolProperties.Set("build.project_name", sketchName+".ino")
 
 	// Set debug port property
 	port := req.GetPort()

internal/cli/debug/debug.go

@@ -36,27 +36,31 @@ import (
 	"github.com/spf13/cobra"
 )
 
-var (
-	fqbnArg     arguments.Fqbn
-	portArgs    arguments.Port
-	interpreter string
-	importDir   string
-	printInfo   bool
-	programmer  arguments.Programmer
-	tr          = i18n.Tr
-)
+var tr = i18n.Tr
 
 // NewCommand created a new `upload` command
 func NewCommand() *cobra.Command {
+	var (
+		fqbnArg     arguments.Fqbn
+		portArgs    arguments.Port
+		interpreter string
+		importDir   string
+		printInfo   bool
+		programmer  arguments.Programmer
+	)
+
 	debugCommand := &cobra.Command{
 		Use:     "debug",
 		Short:   tr("Debug Arduino sketches."),
 		Long:    tr("Debug Arduino sketches. (this command opens an interactive gdb session)"),
 		Example: "  " + os.Args[0] + " debug -b arduino:samd:mkr1000 -P atmel_ice /home/user/Arduino/MySketch",
 		Args:    cobra.MaximumNArgs(1),
-		Run:     runDebugCommand,
+		Run: func(cmd *cobra.Command, args []string) {
+			runDebugCommand(args, &portArgs, &fqbnArg, interpreter, importDir, &programmer, printInfo)
+		},
 	}
 
+	debugCommand.AddCommand(newDebugCheckCommand())
 	fqbnArg.AddToCommand(debugCommand)
 	portArgs.AddToCommand(debugCommand)
 	programmer.AddToCommand(debugCommand)
@@ -67,7 +71,8 @@ func NewCommand() *cobra.Command {
 	return debugCommand
 }
 
-func runDebugCommand(command *cobra.Command, args []string) {
+func runDebugCommand(args []string, portArgs *arguments.Port, fqbnArg *arguments.Fqbn,
+	interpreter string, importDir string, programmer *arguments.Programmer, printInfo bool) {
 	instance := instance.CreateAndInit()
 	logrus.Info("Executing `arduino-cli debug`")
 
@@ -81,7 +86,7 @@ func runDebugCommand(command *cobra.Command, args []string) {
 	if err != nil {
 		feedback.FatalError(err, feedback.ErrGeneric)
 	}
-	fqbn, port := arguments.CalculateFQBNAndPort(&portArgs, &fqbnArg, instance, sk.GetDefaultFqbn(), sk.GetDefaultPort(), sk.GetDefaultProtocol())
+	fqbn, port := arguments.CalculateFQBNAndPort(portArgs, fqbnArg, instance, sk.GetDefaultFqbn(), sk.GetDefaultPort(), sk.GetDefaultProtocol())
 	debugConfigRequested := &rpc.GetDebugConfigRequest{
 		Instance:    instance,
 		Fqbn:        fqbn,

internal/cli/debug/debug_check.go

@@ -0,0 +1,89 @@
+// This file is part of arduino-cli.
+//
+// Copyright 2023 ARDUINO SA (http://www.arduino.cc/)
+//
+// This software is released under the GNU General Public License version 3,
+// which covers the main part of arduino-cli.
+// The terms of this license can be found at:
+// https://www.gnu.org/licenses/gpl-3.0.en.html
+//
+// You can be released from the requirements of the above licenses by purchasing
+// a commercial license. Buying such a license is mandatory if you want to
+// modify or otherwise use the software for commercial activities involving the
+// Arduino software without disclosing the source code of your own applications.
+// To purchase a commercial license, send an email to license@arduino.cc.
+
+package debug
+
+import (
+	"context"
+	"os"
+
+	"github.com/arduino/arduino-cli/commands/debug"
+	"github.com/arduino/arduino-cli/internal/cli/arguments"
+	"github.com/arduino/arduino-cli/internal/cli/feedback"
+	"github.com/arduino/arduino-cli/internal/cli/feedback/result"
+	"github.com/arduino/arduino-cli/internal/cli/instance"
+	rpc "github.com/arduino/arduino-cli/rpc/cc/arduino/cli/commands/v1"
+	"github.com/sirupsen/logrus"
+	"github.com/spf13/cobra"
+)
+
+func newDebugCheckCommand() *cobra.Command {
+	var (
+		fqbnArg     arguments.Fqbn
+		portArgs    arguments.Port
+		interpreter string
+		programmer  arguments.Programmer
+	)
+	debugCheckCommand := &cobra.Command{
+		Use:     "check",
+		Short:   tr("Check if the given board/programmer combination supports debugging."),
+		Example: "  " + os.Args[0] + " debug check -b arduino:samd:mkr1000 -P atmel_ice",
+		Run: func(cmd *cobra.Command, args []string) {
+			runDebugCheckCommand(&portArgs, &fqbnArg, interpreter, &programmer)
+		},
+	}
+	fqbnArg.AddToCommand(debugCheckCommand)
+	portArgs.AddToCommand(debugCheckCommand)
+	programmer.AddToCommand(debugCheckCommand)
+	debugCheckCommand.Flags().StringVar(&interpreter, "interpreter", "console", tr("Debug interpreter e.g.: %s", "console, mi, mi1, mi2, mi3"))
+	return debugCheckCommand
+}
+
+func runDebugCheckCommand(portArgs *arguments.Port, fqbnArg *arguments.Fqbn, interpreter string, programmerArg *arguments.Programmer) {
+	instance := instance.CreateAndInit()
+	logrus.Info("Executing `arduino-cli debug`")
+
+	port, err := portArgs.GetPort(instance, "", "")
+	if err != nil {
+		feedback.FatalError(err, feedback.ErrBadArgument)
+	}
+	fqbn := fqbnArg.String()
+	resp, err := debug.IsDebugSupported(context.Background(), &rpc.IsDebugSupportedRequest{
+		Instance:    instance,
+		Fqbn:        fqbn,
+		Port:        port,
+		Interpreter: interpreter,
+		Programmer:  programmerArg.String(instance, fqbn),
+	})
+	if err != nil {
+		feedback.FatalError(err, feedback.ErrGeneric)
+	}
+	feedback.PrintResult(&debugCheckResult{result.NewIsDebugSupportedResponse(resp)})
+}
+
+type debugCheckResult struct {
+	Result *result.IsDebugSupportedResponse
+}
+
+func (d *debugCheckResult) Data() interface{} {
+	return d.Result
+}
+
+func (d *debugCheckResult) String() string {
+	if d.Result.DebuggingSupported {
+		return tr("The given board/programmer configuration supports debugging.")
+	}
+	return tr("The given board/programmer configuration does NOT support debugging.")
+}

internal/cli/feedback/result/rpc.go

@@ -1057,3 +1057,15 @@ func NewCompileDiagnosticNote(cdn *rpc.CompileDiagnosticNote) *CompileDiagnostic
 		Column:  cdn.GetColumn(),
 	}
 }
+
+type IsDebugSupportedResponse struct {
+	DebuggingSupported bool   `json:"debugging_supported"`
+	DebugFQBN          string `json:"debug_fqbn,omitempty"`
+}
+
+func NewIsDebugSupportedResponse(resp *rpc.IsDebugSupportedResponse) *IsDebugSupportedResponse {
+	return &IsDebugSupportedResponse{
+		DebuggingSupported: resp.GetDebuggingSupported(),
+		DebugFQBN:          resp.GetDebugFqbn(),
+	}
+}

internal/cli/feedback/result/rpc_test.go

@@ -217,6 +217,10 @@ func TestAllFieldAreMapped(t *testing.T) {
 	compileDiagnosticNoteRpc := &rpc.CompileDiagnosticNote{}
 	compileDiagnosticNoteResult := result.NewCompileDiagnosticNote(compileDiagnosticNoteRpc)
 	mustContainsAllPropertyOfRpcStruct(t, compileDiagnosticNoteRpc, compileDiagnosticNoteResult)
+
+	isDebugSupportedResponseRpc := &rpc.IsDebugSupportedResponse{}
+	isDebugSupportedResponseResult := result.NewIsDebugSupportedResponse(isDebugSupportedResponseRpc)
+	mustContainsAllPropertyOfRpcStruct(t, isDebugSupportedResponseRpc, isDebugSupportedResponseResult)
 }
 
 func TestEnumsMapsEveryRpcCounterpart(t *testing.T) {