support for configuration files

src/config.rs

@@ -0,0 +1,33 @@
+use serde::{Deserialize, Serialize};
+use uefi::cstr16;
+use uefi::fs::{FileSystem, Path};
+use uefi::proto::media::fs::SimpleFileSystem;
+
+#[derive(Serialize, Deserialize, Default)]
+pub struct RootConfiguration {
+    #[serde(default)]
+    pub modules: Vec<ModuleConfiguration>,
+}
+
+#[derive(Serialize, Deserialize, Default)]
+pub struct ModuleConfiguration {
+    #[serde(default)]
+    pub chainloader: Option<ChainloaderConfiguration>,
+}
+
+#[derive(Serialize, Deserialize, Default)]
+pub struct ChainloaderConfiguration {
+    pub path: String,
+}
+
+pub fn load() -> RootConfiguration {
+    let fs = uefi::boot::open_protocol_exclusive::<SimpleFileSystem>(
+        uefi::boot::get_handle_for_protocol::<SimpleFileSystem>().expect("no filesystem protocol"),
+    )
+    .expect("unable to open filesystem protocol");
+    let mut fs = FileSystem::new(fs);
+    let content = fs
+        .read(Path::new(cstr16!("sprout.toml")))
+        .expect("unable to read sprout.toml file");
+    toml::from_slice(&content).expect("unable to parse sprout.toml file")
+}