Print the used Wine version on startup

CHANGELOG.md

@@ -26,6 +26,8 @@ Versioning](https://semver.org/spec/v2.0.0.html).
   rather than the loaded `.so` file.
 - Increased the maximum number of audio channels from 32 to 256.
 - Clarified the error that appears when we're unable to load the `.dll`.
+- Yabridge will now print the used version of Wine during startup. This can be
+  useful for diagnosing startup problems.
 
 ### Fixed
 

src/plugin/plugin-bridge.cpp

@@ -22,6 +22,7 @@
 #include <boost/process/env.hpp>
 #include <boost/process/io.hpp>
 #include <boost/process/search_path.hpp>
+#include <boost/process/system.hpp>
 #include <iostream>
 #include <random>
 
@@ -134,6 +135,16 @@ fs::path generate_endpoint_name();
  */
 fs::path get_this_file_location();
 
+/**
+ * Return the installed Wine version. This is obtained by from `wine --version`
+ * and then stripping the `wine-` prefix. This respects the `WINELOADER`
+ * environment variable used in the scripts generated by winegcc.
+ *
+ * This will *not* throw when Wine can not be found, but will instead return
+ * '<NOT FOUND>'. This way the user will still get some useful log files.
+ */
+std::string get_wine_version();
+
 /**
  * Locate the Wine prefix and set the `WINEPREFIX` environment variable if
  * found. This way it's also possible to run .dll files outside of a Wine prefix
@@ -170,6 +181,7 @@ PluginBridge::PluginBridge(audioMasterCallback host_callback)
       host_callback_function(host_callback),
       logger(Logger::create_from_environment(
           create_logger_prefix(socket_endpoint.path()))),
+      wine_version(get_wine_version()),
       wine_stdout(io_context),
       wine_stderr(io_context),
 #ifndef USE_WINEDBG
@@ -202,11 +214,12 @@ PluginBridge::PluginBridge(audioMasterCallback host_callback)
 {
     logger.log("Initializing yabridge version " +
                std::string(yabridge_git_version));
-    logger.log("host:       '" + vst_host_path.string() + "'");
-    logger.log("plugin:     '" + vst_plugin_path.string() + "'");
-    logger.log("socket:     '" + socket_endpoint.path() + "'");
-    logger.log("wineprefix: '" +
+    logger.log("host:         '" + vst_host_path.string() + "'");
+    logger.log("plugin:       '" + vst_plugin_path.string() + "'");
+    logger.log("socket:       '" + socket_endpoint.path() + "'");
+    logger.log("wine prefix:  '" +
                find_wineprefix().value_or("<default>").string() + "'");
+    logger.log("wine version: '" + wine_version + "'");
 
     // Include a list of enabled compile-tiem features, mostly to make debug
     // logs more useful
@@ -802,8 +815,41 @@ fs::path get_this_file_location() {
     return "/" / boost::dll::this_line_location();
 }
 
+std::string get_wine_version() {
+    // The '*.exe' scripts generated by winegcc allow you to override the binary
+    // used to run Wine, so will will respect this as well
+    std::string wine_command = "wine";
+
+    bp::native_environment env = boost::this_process::environment();
+    if (!env["WINELOADER"].empty()) {
+        wine_command = env.get("WINELOADER");
+    }
+
+    bp::ipstream output;
+    try {
+        const fs::path wine_path = bp::search_path(wine_command);
+        bp::system(wine_path, "--version", bp::std_out = output);
+    } catch (const std::system_error&) {
+        return "<NOT FOUND>";
+    }
+
+    // `wine --version` might contain additional output in certain custom Wine
+    // builds, so we only want to look at the first line
+    std::string version_string;
+    std::getline(output, version_string);
+
+    // Strip the `wine-` prefix from the output, could potentially be absent in
+    // custom Wine builds
+    const std::string version_prefix("wine-");
+    if (version_string.find(version_prefix) == 0) {
+        version_string = version_string.substr(version_prefix.size());
+    }
+
+    return version_string;
+}
+
 bp::environment set_wineprefix() {
-    auto env = boost::this_process::environment();
+    bp::native_environment env = boost::this_process::environment();
 
     // Allow the wine prefix to be overridden manually
     if (!env["WINEPREFIX"].empty()) {