fix uncommited net exclusion

if this does not work, do the folliwing steps:
1. remove net submodule
2. remove symlink in local ~/.cache/tinygo/goroot-<hash>/net
3. manual symlink yo local golang /usr/local/bin/src/net

Signed-off-by: leongross <leon.gross@9elements.com>

Author: leongross

loader/goroot.go

@@ -45,7 +45,7 @@ func GetCachedGoroot(config *compileopts.Config) (string, error) {
 	}
 
 	// Find the overrides needed for the goroot.
-	overrides := pathsToOverride(config.GoMinorVersion, needsSyscallPackage(config.BuildTags()))
+	overrides := pathsToOverride(config.GoMinorVersion, config.BuildTags())
 
 	// Resolve the merge links within the goroot.
 	merge, err := listGorootMergeLinks(goroot, tinygoroot, overrides)
@@ -225,9 +225,20 @@ func needsSyscallPackage(buildTags []string) bool {
 	return false
 }
 
+// linuxNetworking returns whether the unmodified go linux net stack should be used
+// until the full rework of the net package is done.
+func linuxNetworking(buildTags []string) bool {
+	for _, tag := range buildTags {
+		if tag == "linux" {
+			return true
+		}
+	}
+	return false
+}
+
 // The boolean indicates whether to merge the subdirs. True means merge, false
 // means use the TinyGo version.
-func pathsToOverride(goMinor int, needsSyscallPackage bool) map[string]bool {
+func pathsToOverride(goMinor int, buildTags []string) map[string]bool {
 	paths := map[string]bool{
 		"":                            true,
 		"crypto/":                     true,
@@ -264,15 +275,16 @@ func pathsToOverride(goMinor int, needsSyscallPackage bool) map[string]bool {
 		paths["crypto/internal/boring/sig/"] = false
 	}
 
-	if needsSyscallPackage {
+	if needsSyscallPackage(buildTags) {
 		paths["syscall/"] = true // include syscall/js
 	}
 
-	// to enable network support for linux systems, reuse the Go version of the net package
-	// and the according runtime functions
-	// if runtime.GOOS == "linux" {
-	// 	paths["runtime/netpoll/"] = true
-	// }
+	if linuxNetworking(buildTags) {
+		for _, v := range []string{"crypto/tls/", "net/http/", "net/"} {
+			delete(paths, v) // remote entries so go stdlib is used
+		}
+	}
+
 	return paths
 }
 

loader/loader.go

@@ -279,7 +279,7 @@ func (p *Program) getOriginalPath(path string) string {
 			originalPath = realgorootPath
 		}
 		maybeInTinyGoRoot := false
-		for prefix := range pathsToOverride(p.config.GoMinorVersion, needsSyscallPackage(p.config.BuildTags())) {
+		for prefix := range pathsToOverride(p.config.GoMinorVersion, p.config.BuildTags()) {
 			if runtime.GOOS == "windows" {
 				prefix = strings.ReplaceAll(prefix, "/", "\\")
 			}