remove usage of which, uname and whoami

ports/port.script

@@ -110,7 +110,7 @@ void PortBusybox() {
 	str version = "1.33.1";
 	if processorCount == 0 processorCount = SystemGetProcessorCount();
 
-	if StringTrim(SystemShellEvaluate("uname")) == "Darwin" {
+	if SystemGetHostName() == "Darwin" {
 		SystemSetEnvironmentVariable("PATH", "/usr/local/opt/gnu-sed/libexec/gnubin:" + SystemGetEnvironmentVariable("PATH"));
 	}
 
@@ -174,7 +174,7 @@ void PortGCC() {
 	}
 
 	// Make sure we're not running as root.
-	assert StringTrim(SystemShellEvaluate("whoami")) != "root";
+	assert !SystemRunningAsAdministrator();
 
 	// Version strings:
 	str gccVersion      = "11.1.0";
@@ -203,24 +203,23 @@ void PortGCC() {
 		assert SystemGetEnvironmentVariable("PATH") == path;
 
 		// Get the brew library path if we're running on Darwin.
-		str hostPlatform = StringTrim(SystemShellEvaluate("uname"));
 		str libraryPath = "";
-		if hostPlatform == "Darwin" libraryPath = "-L" + StringTrim(SystemShellEvaluate("brew --prefix")) + "/lib";
+		if SystemGetHostName() == "Darwin" libraryPath = "-L" + StringTrim(SystemShellEvaluate("brew --prefix")) + "/lib";
 
 		// Check all the needed tools are available.
-		assert SystemShellExecute("which g++");
-		assert SystemShellExecute("which make");
-		assert SystemShellExecute("which bison");
-		assert SystemShellExecute("which flex");
-		assert SystemShellExecute("which curl");
-		assert SystemShellExecute("which nasm");
-		assert SystemShellExecute("which ctags");
-		assert SystemShellExecute("which xz");
-		assert SystemShellExecute("which gzip");
-		assert SystemShellExecute("which tar");
-		assert SystemShellExecute("which grep");
-		assert SystemShellExecute("which sed");
-		assert SystemShellExecute("which awk");
+		assert SystemShellExecute("awk -V");
+		assert SystemShellExecute("bison -V");
+		assert SystemShellExecute("ctags --version");
+		assert SystemShellExecute("curl -V");
+		assert SystemShellExecute("flex -V");
+		assert SystemShellExecute("g++ --version");
+		assert SystemShellExecute("grep -V");
+		assert SystemShellExecute("gzip -V");
+		assert SystemShellExecute("make -v");
+		assert SystemShellExecute("nasm -v");
+		assert SystemShellExecute("sed --version");
+		assert SystemShellExecute("tar --version");
+		assert SystemShellExecute("xz -V");
 
 		// Check all the needed libraries are available.
 		assert FileWriteAll("bin/test.c", "void main() {}");

util/script.c

@@ -395,6 +395,8 @@ char baseModuleSource[] = {
 	// Miscellaneous:
 
 	"int SystemGetProcessorCount() #extcall;"
+	"bool SystemRunningAsAdministrator() #extcall;"
+	"str SystemGetHostName() #extcall;"
 
 	// File system access:
 
@@ -440,6 +442,8 @@ int ExternalSystemShellEvaluate(ExecutionContext *context, Value *returnValue);
 int ExternalSystemGetProcessorCount(ExecutionContext *context, Value *returnValue);
 int ExternalSystemGetEnvironmentVariable(ExecutionContext *context, Value *returnValue);
 int ExternalSystemSetEnvironmentVariable(ExecutionContext *context, Value *returnValue);
+int ExternalSystemRunningAsAdministrator(ExecutionContext *context, Value *returnValue);
+int ExternalSystemGetHostName(ExecutionContext *context, Value *returnValue);
 int ExternalPathCreateDirectory(ExecutionContext *context, Value *returnValue);
 int ExternalPathCreateLeadingDirectories(ExecutionContext *context, Value *returnValue);
 int ExternalPathDelete(ExecutionContext *context, Value *returnValue);
@@ -467,6 +471,8 @@ ExternalFunction externalFunctions[] = {
 	{ .cName = "SystemGetProcessorCount", .callback = ExternalSystemGetProcessorCount },
 	{ .cName = "SystemGetEnvironmentVariable", .callback = ExternalSystemGetEnvironmentVariable },
 	{ .cName = "SystemSetEnvironmentVariable", .callback = ExternalSystemSetEnvironmentVariable },
+	{ .cName = "SystemRunningAsAdministrator", .callback = ExternalSystemRunningAsAdministrator },
+	{ .cName = "SystemGetHostName", .callback = ExternalSystemGetHostName },
 	{ .cName = "PathExists", .callback = ExternalPathExists },
 	{ .cName = "PathCreateDirectory", .callback = ExternalPathCreateDirectory },
 	{ .cName = "PathCreateLeadingDirectories", .callback = ExternalPathCreateLeadingDirectories },
@@ -4294,6 +4300,7 @@ void ScriptFree(ExecutionContext *context) {
 #else
 #include <dirent.h>
 #include <unistd.h>
+#include <sys/utsname.h>
 #endif
 #include <errno.h>
 #include <stdarg.h>
@@ -5065,6 +5072,35 @@ int ExternalSystemGetProcessorCount(ExecutionContext *context, Value *returnValu
 	return 2;
 }
 
+int ExternalSystemRunningAsAdministrator(ExecutionContext *context, Value *returnValue) {
+	(void) context;
+#ifdef _WIN32
+#pragma message ("ExternalSystemRunningAsAdministrator unimplemented")
+	returnValue->i = 0;
+#else
+	returnValue->i = geteuid() == 0;
+#endif
+	return 2;
+}
+
+int ExternalSystemGetHostName(ExecutionContext *context, Value *returnValue) {
+	(void) context;
+	const char *name;
+#ifdef _WIN32
+	name = "Windows";
+#else
+	struct utsname buffer;
+	uname(&buffer);
+	name = buffer.sysname;
+#endif
+	returnValue->i = HeapAllocate(context);
+	context->heap[returnValue->i].type = T_STR;
+	context->heap[returnValue->i].bytes = strlen(name);
+	context->heap[returnValue->i].text = AllocateResize(NULL, context->heap[returnValue->i].bytes);
+	memcpy(context->heap[returnValue->i].text, name, context->heap[returnValue->i].bytes);
+	return 3;
+}
+
 void *AllocateFixed(size_t bytes) {
 	if (!bytes) {
 		return NULL;