Block game launch when no Wine prefix is configured

Instead of logging a warning and attempting to launch (which fails with
EACCES), show a clear error dialog directing the user to Settings →
Wine/Proton to create a prefix.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

1 files changed, 20 insertions, 6 deletions

diff --git a/src/src/spawn.cpp b/src/src/spawn.cpp
index 4a4d32b..d94fbae 100644
--- a/src/src/spawn.cpp
+++ b/src/src/spawn.cpp
@@ -663,13 +663,15 @@ int spawn(const SpawnParameters &sp, pid_t &processId) {
 

     const QString prefixPath = resolvePrefixPath();

     if (prefixPath.isEmpty()) {

-      MOBase::log::warn(

-          "No Wine prefix configured - games may not launch correctly. "

-          "Configure a prefix in Settings > Proton or via fluorine-manager.");

+      MOBase::log::error(

+          "No Wine prefix configured - cannot launch game. "

+          "Configure a prefix in Settings > Proton.");

+      return ENOENT;

     } else if (!QDir(QDir(prefixPath).filePath("drive_c")).exists()) {

-      MOBase::log::warn(

-          "Wine prefix '{}' does not contain drive_c/ - prefix may be invalid",

+      MOBase::log::error(

+          "Wine prefix '{}' does not contain drive_c/ - prefix is invalid",

           prefixPath);

+      return ENOENT;

     } else {

       MOBase::log::info("Using Wine prefix: {}", prefixPath);

       launcher.setPrefix(prefixPath);

@@ -1024,7 +1026,19 @@ pid_t startBinary(QWidget *parent, const SpawnParameters &sp) {
   const auto e = spawn::spawn(sp, pid);

 

   if (e != 0) {

-    dialogs::spawnFailed(parent, sp, e);

+    if (e == ENOENT && sp.useProton) {

+      QMessageBox::critical(

+          parent, QObject::tr("No Wine Prefix"),

+          QObject::tr("No Wine prefix has been configured for this instance.\n\n"

+                       "A Wine prefix is required to run Windows games through "

+                       "Proton.\n\n"

+                       "To create one, go to:\n"

+                       "  Settings \u2192 Wine/Proton\n\n"

+                       "Set the prefix location, then click \"Create Prefix\" "

+                       "to generate a new prefix."));

+    } else {

+      dialogs::spawnFailed(parent, sp, e);

+    }

     return -1;

   }