feat: Expose attach config from mod host as env var

Cargo.toml

@@ -11,7 +11,7 @@ members = [
   "crates/mod-host-types",
   "crates/telemetry",
   "crates/xtask",
-  "crates/binary-analysis",
+  "crates/binary-analysis", "crates/mod-host-api",
 ]
 resolver = "2"
 

crates/cli/src/config.rs

@@ -41,6 +41,10 @@ pub struct Options {
     #[clap(long, help_heading = "Configuration", value_hint = clap::ValueHint::DirPath)]
     pub(crate) windows_binaries_dir: Option<Box<Path>>,
 
+    /// Path to a directory used to store me3 log files.
+    #[clap(long, help_heading = "Configuration", value_hint = clap::ValueHint::DirPath)]
+    pub(crate) log_dir: Option<Box<Path>>,
+
     #[clap(skip)]
     #[serde(default)]
     pub(crate) game: BTreeMap<Game, GameOptions>,
@@ -53,7 +57,10 @@ pub struct Config {
 
 impl Config {
     pub fn log_dir(&self) -> Option<Box<Path>> {
-        self.known_dirs.data_dir().join("logs")
+        self.options
+            .log_dir
+            .clone()
+            .or_else(|| self.known_dirs.data_dir().join("logs"))
     }
 
     pub fn cache_dir(&self) -> Option<Box<Path>> {
@@ -107,6 +114,7 @@ impl Options {
         Self {
             crash_reporting: other.crash_reporting.or(self.crash_reporting),
             game: other.game.into_iter().chain(self.game).collect(),
+            log_dir: other.log_dir.or(self.log_dir),
             profile_dir: other.profile_dir.or(self.profile_dir),
             steam_dir: other.steam_dir.or(self.steam_dir),
             windows_binaries_dir: other.windows_binaries_dir.or(self.windows_binaries_dir),

crates/mod-host-api/Cargo.toml

@@ -0,0 +1,14 @@
+[package]
+name = "me3-mod-host-api"
+version = "0.9.0"
+edition.workspace = true
+rust-version.workspace = true
+repository.workspace = true
+license.workspace = true
+
+[dependencies]
+me3-launcher-attach-protocol.workspace = true
+serde_json.workspace = true
+
+[lints]
+workspace = true

crates/mod-host-api/src/lib.rs

@@ -0,0 +1,6 @@
+use me3_launcher_attach_protocol::AttachConfig;
+
+pub fn current_attach_config() -> Option<AttachConfig> {
+    let json_var = std::env::var("ME3_ATTACH_CONFIG").ok();
+    json_var.map(|v| serde_json::from_str(&v).expect("mod host serialized invalid data"))
+}

crates/mod-host/src/lib.rs

@@ -70,6 +70,12 @@ fn on_attach(request: AttachRequest) -> AttachResult {
     me3_telemetry::install_error_handler();
 
     let attach_config = Arc::new(request.config);
+    let attach_config_json = serde_json::to_string(&*attach_config)?;
+
+    // SAFETY: only called on Windows
+    unsafe {
+        std::env::set_var("ME3_ATTACH_CONFIG", attach_config_json);
+    }
 
     let telemetry_vars: TelemetryVars = me3_env::deserialize_from_env()?;