Add FUSE external mapping support, BG3/Oblivion Remastered fixes, fomod-plus and NaK integration

FUSE VFS now deploys non-data-dir mod mappings (Paks, OBSE, UE4SS, etc.)
via real symlinks and injects file-level data-dir mappings (plugins.txt,
loadorder.txt) into the VFS tree. Fixes game launches for Oblivion
Remastered (Root Builder path resolution, script extender support) and
BG3 (Wine prefix documents directory, file mapper symlinks on Linux).

Vendors mo2-fomod-plus plugin and NaK crate for FOMOD installer and
game finder/runtime support.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

1 files changed, 177 insertions, 0 deletions

diff --git a/libs/nak/src/deps/mod.rs b/libs/nak/src/deps/mod.rs
new file mode 100644
index 0000000..a055eb7
--- /dev/null
+++ b/libs/nak/src/deps/mod.rs
@@ -0,0 +1,177 @@
+//! Dependency management via winetricks
+//!
+//! Uses winetricks for all Windows dependency installation.
+
+pub mod tools;
+
+use std::error::Error;
+use std::path::Path;
+use std::sync::atomic::{AtomicBool, Ordering};
+use std::sync::Arc;
+
+use crate::config::AppConfig;
+use crate::logging::{log_error, log_install};
+use crate::runtime_wrap;
+use crate::steam::SteamProton;
+
+// Re-export tools
+pub use tools::{check_command_available, ensure_cabextract, ensure_winetricks, get_winetricks_path};
+
+/// Standard winetricks verbs for MO2 prefix
+pub const STANDARD_VERBS: &[&str] = &[
+    "vcrun2022",      // Visual C++ 2015-2022 Runtime
+    "dotnet6",        // .NET 6.0
+    "dotnet7",        // .NET 7.0
+    "dotnet8",        // .NET 8.0
+    "dotnetdesktop6", // .NET Desktop Runtime 6.0
+    "d3dcompiler_47", // DirectX Compiler 47
+    "d3dcompiler_43", // DirectX Compiler 43
+    "d3dx9",          // DirectX 9 (all versions)
+    "d3dx11_43",      // DirectX 11
+    "xact",           // XACT Audio (32-bit)
+    "xact_x64",       // XACT Audio (64-bit)
+];
+
+
+/// Run winetricks to install dependencies
+pub fn run_winetricks(
+    prefix_path: &Path,
+    proton: &SteamProton,
+    verbs: &[&str],
+    log_callback: impl Fn(String),
+) -> Result<(), Box<dyn Error>> {
+    if verbs.is_empty() {
+        return Ok(());
+    }
+
+    let winetricks_path = ensure_winetricks()?;
+    ensure_cabextract()?;
+
+    let Some(wine_bin) = proton.wine_binary() else {
+        return Err("Wine binary not found in Proton".into());
+    };
+
+    let Some(wineserver_bin) = proton.wineserver_binary() else {
+        return Err("Wineserver binary not found in Proton".into());
+    };
+
+    let cache_dir = AppConfig::get_default_cache_dir();
+    std::fs::create_dir_all(&cache_dir)?;
+
+    let verbs_str = verbs.join(" ");
+    log_callback(format!("Installing dependencies via winetricks: {}", verbs_str));
+    log_install(&format!("Running winetricks with verbs: {}", verbs_str));
+
+    let nak_bin = tools::get_nak_bin_path();
+    let current_path = std::env::var("PATH").unwrap_or_default();
+    let new_path = format!("{}:{}", nak_bin.display(), current_path);
+
+    let envs: Vec<(&str, String)> = vec![
+        ("PATH", new_path),
+        ("WINE", wine_bin.display().to_string()),
+        ("WINESERVER", wineserver_bin.display().to_string()),
+        ("WINEPREFIX", prefix_path.display().to_string()),
+        ("WINETRICKS_CACHE", cache_dir.display().to_string()),
+    ];
+    let status = runtime_wrap::build_command(&winetricks_path, &envs)
+        .arg("-q")
+        .args(verbs)
+        .status()?;
+
+    if !status.success() {
+        let err_msg = format!("Winetricks failed with exit code: {:?}", status.code());
+        log_error(&err_msg);
+        return Err(err_msg.into());
+    }
+
+    log_install("Winetricks completed successfully");
+    Ok(())
+}
+
+/// Install all standard dependencies to a prefix
+pub fn install_standard_deps(
+    prefix_path: &Path,
+    proton: &SteamProton,
+    log_callback: impl Fn(String),
+) -> Result<(), Box<dyn Error>> {
+    run_winetricks(prefix_path, proton, STANDARD_VERBS, log_callback)
+}
+
+/// Run winetricks with cancellation support.
+pub fn run_winetricks_cancellable(
+    prefix_path: &Path,
+    proton: &SteamProton,
+    verbs: &[&str],
+    log_callback: impl Fn(String),
+    cancel_flag: &Arc<AtomicBool>,
+) -> Result<(), Box<dyn Error>> {
+    if verbs.is_empty() {
+        return Ok(());
+    }
+
+    let winetricks_path = ensure_winetricks()?;
+    ensure_cabextract()?;
+
+    let Some(wine_bin) = proton.wine_binary() else {
+        return Err("Wine binary not found in Proton".into());
+    };
+
+    let Some(wineserver_bin) = proton.wineserver_binary() else {
+        return Err("Wineserver binary not found in Proton".into());
+    };
+
+    let cache_dir = AppConfig::get_default_cache_dir();
+    std::fs::create_dir_all(&cache_dir)?;
+
+    let verbs_str = verbs.join(" ");
+    log_callback(format!("Installing dependencies via winetricks: {}", verbs_str));
+    log_install(&format!("Running winetricks with verbs: {}", verbs_str));
+
+    let nak_bin = tools::get_nak_bin_path();
+    let current_path = std::env::var("PATH").unwrap_or_default();
+    let new_path = format!("{}:{}", nak_bin.display(), current_path);
+
+    let envs: Vec<(&str, String)> = vec![
+        ("PATH", new_path),
+        ("WINE", wine_bin.display().to_string()),
+        ("WINESERVER", wineserver_bin.display().to_string()),
+        ("WINEPREFIX", prefix_path.display().to_string()),
+        ("WINETRICKS_CACHE", cache_dir.display().to_string()),
+    ];
+    let mut child = runtime_wrap::build_command(&winetricks_path, &envs)
+        .arg("-q")
+        .args(verbs)
+        .spawn()?;
+
+    loop {
+        match child.try_wait()? {
+            Some(status) => {
+                if !status.success() {
+                    let err_msg = format!("Winetricks failed with exit code: {:?}", status.code());
+                    log_error(&err_msg);
+                    return Err(err_msg.into());
+                }
+                log_install("Winetricks completed successfully");
+                return Ok(());
+            }
+            None => {
+                if cancel_flag.load(Ordering::Relaxed) {
+                    let _ = child.kill();
+                    let _ = child.wait();
+                    return Err("Cancelled".into());
+                }
+                std::thread::sleep(std::time::Duration::from_millis(250));
+            }
+        }
+    }
+}
+
+/// Install standard deps with cancellation support
+pub fn install_standard_deps_cancellable(
+    prefix_path: &Path,
+    proton: &SteamProton,
+    log_callback: impl Fn(String),
+    cancel_flag: &Arc<AtomicBool>,
+) -> Result<(), Box<dyn Error>> {
+    run_winetricks_cancellable(prefix_path, proton, STANDARD_VERBS, log_callback, cancel_flag)
+}