builder.GenBuildPath now tolerates missing sketch folder (#428)

arduino/builder/builder.go

@@ -19,18 +19,22 @@ import (
 	"crypto/md5"
 	"encoding/hex"
 	"os"
-	"path/filepath"
 	"strings"
 
+	"github.com/arduino/go-paths-helper"
 	"github.com/pkg/errors"
 )
 
-// GenBuildPath generates a suitable name for the build folder
-func GenBuildPath(sketchPath string) string {
-	md5SumBytes := md5.Sum([]byte(sketchPath))
+// GenBuildPath generates a suitable name for the build folder.
+// The sketchPath, if not nil, is also used to furhter differentiate build paths.
+func GenBuildPath(sketchPath *paths.Path) *paths.Path {
+	path := ""
+	if sketchPath != nil {
+		path = sketchPath.String()
+	}
+	md5SumBytes := md5.Sum([]byte(path))
 	md5Sum := strings.ToUpper(hex.EncodeToString(md5SumBytes[:]))
-
-	return filepath.Join(os.TempDir(), "arduino-sketch-"+md5Sum)
+	return paths.TempDir().Join("arduino-sketch-" + md5Sum)
 }
 
 // EnsureBuildPathExists creates the build path if doesn't already exists.

arduino/builder/builder_test.go

@@ -23,6 +23,7 @@ import (
 	"testing"
 
 	"github.com/arduino/arduino-cli/arduino/builder"
+	"github.com/arduino/go-paths-helper"
 	"github.com/stretchr/testify/assert"
 )
 
@@ -36,7 +37,10 @@ func tmpDirOrDie() string {
 
 func TestGenBuildPath(t *testing.T) {
 	want := filepath.Join(os.TempDir(), "arduino-sketch-ACBD18DB4CC2F85CEDEF654FCCC4A4D8")
-	assert.Equal(t, want, builder.GenBuildPath("foo"))
+	assert.Equal(t, want, builder.GenBuildPath(paths.New("foo")).String())
+
+	want = filepath.Join(os.TempDir(), "arduino-sketch-D41D8CD98F00B204E9800998ECF8427E")
+	assert.Equal(t, want, builder.GenBuildPath(nil).String())
 }
 
 func TestEnsureBuildPathExists(t *testing.T) {

legacy/builder/builder.go

@@ -43,7 +43,6 @@ import (
 	"github.com/arduino/arduino-cli/legacy/builder/phases"
 	"github.com/arduino/arduino-cli/legacy/builder/types"
 	"github.com/arduino/arduino-cli/legacy/builder/utils"
-	"github.com/arduino/go-paths-helper"
 )
 
 var MAIN_FILE_VALID_EXTENSIONS = map[string]bool{".ino": true, ".pde": true}
@@ -58,7 +57,7 @@ type Builder struct{}
 
 func (s *Builder) Run(ctx *types.Context) error {
 	if ctx.BuildPath == nil {
-		ctx.BuildPath = paths.New(bldr.GenBuildPath(ctx.SketchLocation.String()))
+		ctx.BuildPath = bldr.GenBuildPath(ctx.SketchLocation)
 	}
 
 	if err := bldr.EnsureBuildPathExists(ctx.BuildPath.String()); err != nil {
@@ -150,7 +149,7 @@ type Preprocess struct{}
 
 func (s *Preprocess) Run(ctx *types.Context) error {
 	if ctx.BuildPath == nil {
-		ctx.BuildPath = paths.New(bldr.GenBuildPath(ctx.SketchLocation.String()))
+		ctx.BuildPath = bldr.GenBuildPath(ctx.SketchLocation)
 	}
 
 	if err := bldr.EnsureBuildPathExists(ctx.BuildPath.String()); err != nil {
@@ -186,7 +185,7 @@ type ParseHardwareAndDumpBuildProperties struct{}
 
 func (s *ParseHardwareAndDumpBuildProperties) Run(ctx *types.Context) error {
 	if ctx.BuildPath == nil {
-		ctx.BuildPath = paths.New(bldr.GenBuildPath(ctx.SketchLocation.String()))
+		ctx.BuildPath = bldr.GenBuildPath(ctx.SketchLocation)
 	}
 
 	commands := []types.Command{