Builder allows loading of global user-customizable platform.txt

Fix #469

Author: cmaglie

Diff for: arduino/cores/packagemanager/loader.go

@@ -77,6 +77,17 @@ func (pm *PackageManager) LoadHardwareFromDirectory(path *paths.Path) error {
 	for _, packagerPath := range files {
 		packager := packagerPath.Base()
 
+		// Load custom platform properties if available
+		if packager == "platform.txt" {
+			pm.Log.Infof("Loading custom platform properties: %s", packagerPath)
+			if p, err := properties.LoadFromPath(packagerPath); err != nil {
+				pm.Log.WithError(err).Errorf("Error loading properties.")
+			} else {
+				pm.CustomGlobalProperties.Merge(p)
+			}
+			continue
+		}
+
 		// First exclude all "tools" directory
 		if packager == "tools" {
 			pm.Log.Infof("Excluding directory: %s", packagerPath)

Diff for: arduino/cores/packagemanager/package_manager.go

@@ -38,23 +38,25 @@ import (
 // The manager also keeps track of the status of the Packages (their Platform Releases, actually)
 // installed in the system.
 type PackageManager struct {
-	Log         logrus.FieldLogger
-	Packages    cores.Packages
-	IndexDir    *paths.Path
-	PackagesDir *paths.Path
-	DownloadDir *paths.Path
-	TempDir     *paths.Path
+	Log                    logrus.FieldLogger
+	Packages               cores.Packages
+	IndexDir               *paths.Path
+	PackagesDir            *paths.Path
+	DownloadDir            *paths.Path
+	TempDir                *paths.Path
+	CustomGlobalProperties *properties.Map
 }
 
 // NewPackageManager returns a new instance of the PackageManager
 func NewPackageManager(indexDir, packagesDir, downloadDir, tempDir *paths.Path) *PackageManager {
 	return &PackageManager{
-		Log:         logrus.StandardLogger(),
-		Packages:    cores.NewPackages(),
-		IndexDir:    indexDir,
-		PackagesDir: packagesDir,
-		DownloadDir: downloadDir,
-		TempDir:     tempDir,
+		Log:                    logrus.StandardLogger(),
+		Packages:               cores.NewPackages(),
+		IndexDir:               indexDir,
+		PackagesDir:            packagesDir,
+		DownloadDir:            downloadDir,
+		TempDir:                tempDir,
+		CustomGlobalProperties: properties.NewMap(),
 	}
 }
 

Diff for: legacy/builder/setup_build_properties.go

@@ -127,6 +127,8 @@ func (s *SetupBuildProperties) Run(ctx *types.Context) error {
 	buildProperties.Set("extra.time.zone", strconv.Itoa(timeutils.TimezoneOffsetNoDST(now)))
 	buildProperties.Set("extra.time.dst", strconv.Itoa(timeutils.DaylightSavingsOffset(now)))
 
+	buildProperties.Merge(ctx.PackageManager.CustomGlobalProperties)
+
 	ctx.BuildProperties = buildProperties
 
 	return nil