Run $WINELOADER --version under the correct env

This makes the initialization message reflect the correct Wine version
when using a `WINELOADER` script to change between Wine versions
depending on the Wine prefix.

src/plugin/bridges/common.h

@@ -175,7 +175,7 @@ class PluginBridge {
             info.wine_prefix);
         init_msg << "'" << std::endl;
 
-        init_msg << "wine version:  '" << get_wine_version() << "'"
+        init_msg << "wine version:  '" << info.wine_version() << "'"
                  << std::endl;
         init_msg << std::endl;
 

src/plugin/utils.cpp

@@ -24,6 +24,10 @@
 #include <boost/process/system.hpp>
 #include <sstream>
 
+// XXX: With Boost 1.75 at least, this header cannot be included in alphabetical
+//      order because it's missing some includes
+#include <boost/process/env.hpp>
+
 // Generated inside of the build directory
 #include <src/common/config/config.h>
 
@@ -90,6 +94,41 @@ boost::filesystem::path PluginInfo::normalize_wine_prefix() const {
         wine_prefix);
 }
 
+std::string PluginInfo::wine_version() const {
+    // The '*.exe' scripts generated by winegcc allow you to override the binary
+    // used to run Wine, so will will handle this in the same way for our Wine
+    // version detection
+    fs::path wine_path;
+    bp::environment env = create_host_env();
+    if (const std::string wineloader_path = env["WINELOADER"].to_string();
+        access(wineloader_path.c_str(), X_OK) == 0) {
+        wine_path = wineloader_path;
+    } else {
+        wine_path = bp::search_path("wine").string();
+    }
+
+    bp::ipstream output;
+    try {
+        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
+    constexpr std::string_view version_prefix("wine-");
+    if (version_string.starts_with(version_prefix)) {
+        version_string = version_string.substr(version_prefix.size());
+    }
+
+    return version_string;
+}
+
 fs::path find_plugin_library(const fs::path& this_plugin_path,
                              PluginType plugin_type,
                              bool prefer_32bit_vst3) {
@@ -341,41 +380,6 @@ std::vector<boost::filesystem::path> get_augmented_search_path() {
     return search_path;
 }
 
-std::string get_wine_version() {
-    // The '*.exe' scripts generated by winegcc allow you to override the binary
-    // used to run Wine, so will will handle this in the same way for our Wine
-    // version detection
-    fs::path wine_path;
-    bp::environment env = boost::this_process::environment();
-    if (const std::string wineloader_path = env["WINELOADER"].to_string();
-        access(wineloader_path.c_str(), X_OK) == 0) {
-        wine_path = wineloader_path;
-    } else {
-        wine_path = bp::search_path("wine").string();
-    }
-
-    bp::ipstream output;
-    try {
-        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
-    constexpr std::string_view version_prefix("wine-");
-    if (version_string.starts_with(version_prefix)) {
-        version_string = version_string.substr(version_prefix.size());
-    }
-
-    return version_string;
-}
-
 Configuration load_config_for(const fs::path& yabridge_path) {
     // First find the closest `yabridge.tmol` file for the plugin, falling back
     // to default configuration settings if it doesn't exist

src/plugin/utils.h

@@ -83,6 +83,19 @@ struct PluginInfo {
      */
     boost::filesystem::path normalize_wine_prefix() const;
 
+    /**
+     * 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. The script will be run with under the same environment as the
+     * Wine plugin host will be run at, since the user may use a custom
+     * `WINELOADER` to change use different Wine binaries for each prefix.
+     *
+     * 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 wine_version() const;
+
     const PluginType plugin_type;
 
     /**
@@ -228,16 +241,6 @@ std::vector<boost::filesystem::path> get_augmented_search_path();
  */
 boost::filesystem::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();
-
 /**
  * Load the configuration that belongs to a copy of or symlink to
  * `libyabridge-{vst2,vst3}.so`. If no configuration file could be found then