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fix: respect pre-set environment variables in build template #6394

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fix: respect pre-set environment variables in build template #6394

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8cb2ad3
fix: respect pre-set environment variables in build template
Bahtya Apr 8, 2026
dd80646
style: fix indentation of FLET_ASSETS_DIR putIfAbsent
Bahtya Apr 8, 2026
81f1ec8
style: fix indentation per review feedback
Bahtya Apr 8, 2026
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20 changes: 10 additions & 10 deletions sdk/python/templates/build/{{cookiecutter.out_dir}}/lib/main.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -65,7 +65,7 @@ List<String> _args = [];
String pageUrl = "";
String assetsDir = "";
String appDir = "";
Map<String, String> environmentVariables = {};
Map<String, String> environmentVariables = Map.from(Platform.environment);

void main(List<String> args) async {

Expand Down Expand Up @@ -187,29 +187,29 @@ Future prepareApp() async {
}
}

environmentVariables["FLET_APP_STORAGE_DATA"] = appDataPath;
environmentVariables["FLET_APP_STORAGE_TEMP"] = appTempPath;
environmentVariables.putIfAbsent("FLET_APP_STORAGE_DATA", () => appDataPath);
environmentVariables.putIfAbsent("FLET_APP_STORAGE_TEMP", () => appTempPath);

outLogFilename = path.join(appTempPath, "console.log");
environmentVariables["FLET_APP_CONSOLE"] = outLogFilename;
environmentVariables.putIfAbsent("FLET_APP_CONSOLE", () => outLogFilename);

environmentVariables["FLET_PLATFORM"] =
defaultTargetPlatform.name.toLowerCase();
environmentVariables.putIfAbsent(
"FLET_PLATFORM", () => defaultTargetPlatform.name.toLowerCase());

if (defaultTargetPlatform == TargetPlatform.windows) {
// use TCP on Windows
var tcpPort = await getUnusedPort();
pageUrl = "tcp://localhost:$tcpPort";
environmentVariables["FLET_SERVER_PORT"] = tcpPort.toString();
environmentVariables.putIfAbsent("FLET_SERVER_PORT", () => tcpPort.toString());
} else {
// use UDS on other platforms
pageUrl = "flet_$pid.sock";
environmentVariables["FLET_SERVER_UDS_PATH"] = pageUrl;
environmentVariables.putIfAbsent("FLET_SERVER_UDS_PATH", () => pageUrl);
}
}

if (!kIsWeb && assetsDir.isNotEmpty) {
environmentVariables["FLET_ASSETS_DIR"] = assetsDir;
environmentVariables.putIfAbsent("FLET_ASSETS_DIR", () => assetsDir);
}

return "";
Expand Down Expand Up @@ -245,7 +245,7 @@ Future<String?> runPythonApp(List<String> args) async {
debugPrint('Python output Socket Server is listening on $socketAddr');
}

environmentVariables["FLET_PYTHON_CALLBACK_SOCKET_ADDR"] = socketAddr;
environmentVariables.putIfAbsent("FLET_PYTHON_CALLBACK_SOCKET_ADDR", () => socketAddr);

void closeOutServer() async {
outSocketServer.close();
Expand Down
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