add initial bls support

src/generators/bls.rs

@@ -0,0 +1,82 @@
+mod entry;
+
+use crate::config::EntryDeclaration;
+use crate::context::SproutContext;
+use crate::generators::bls::entry::BlsEntry;
+use crate::utils;
+use anyhow::{Context, Result};
+use serde::{Deserialize, Serialize};
+use std::rc::Rc;
+use std::str::FromStr;
+use uefi::CString16;
+use uefi::fs::{FileSystem, Path};
+use uefi::proto::device_path::text::{AllowShortcuts, DisplayOnly};
+use uefi::proto::media::fs::SimpleFileSystem;
+
+#[derive(Serialize, Deserialize, Default, Clone)]
+pub struct BlsConfiguration {
+    pub entry: EntryDeclaration,
+    #[serde(default = "default_bls_path")]
+    pub path: String,
+}
+
+fn default_bls_path() -> String {
+    "\\loader\\entries".to_string()
+}
+
+pub fn generate(
+    context: Rc<SproutContext>,
+    bls: &BlsConfiguration,
+) -> Result<Vec<(Rc<SproutContext>, EntryDeclaration)>> {
+    let mut entries = Vec::new();
+
+    let path = context.stamp(&bls.path);
+    let resolved = utils::resolve_path(context.root().loaded_image_path()?, &path)
+        .context("failed to resolve bls path")?;
+    let fs = uefi::boot::open_protocol_exclusive::<SimpleFileSystem>(resolved.filesystem_handle)
+        .context("failed to open bls filesystem")?;
+    let mut fs = FileSystem::new(fs);
+    let sub_text_path = resolved
+        .sub_path
+        .to_string(DisplayOnly(false), AllowShortcuts(false))
+        .context("failed to convert subpath to string")?;
+    let entries_path = Path::new(&sub_text_path);
+
+    let entries_iter = fs
+        .read_dir(entries_path)
+        .context("failed to read bls entries")?;
+
+    for entry in entries_iter {
+        let entry = entry?;
+        if !entry.is_regular_file() {
+            continue;
+        }
+        let name = entry.file_name().to_string();
+        if !name.ends_with(".conf") {
+            continue;
+        }
+
+        let full_entry_path = CString16::try_from(format!("{}\\{}", sub_text_path, name).as_str())
+            .context("failed to construct full entry path")?;
+        let full_entry_path = Path::new(&full_entry_path);
+        let content = fs
+            .read(full_entry_path)
+            .context("failed to read bls file")?;
+        let content = String::from_utf8(content).context("failed to read bls entry as utf8")?;
+        let entry = BlsEntry::from_str(&content).context("failed to parse bls entry")?;
+
+        if !entry.is_valid() {
+            continue;
+        }
+
+        let mut context = context.fork();
+        context.set("title", entry.title().unwrap_or(name));
+        context.set("chainload", entry.chainload_path().unwrap_or_default());
+        context.set("options", entry.options().unwrap_or_default());
+        context.set("initrd", entry.initrd_path().unwrap_or_default());
+
+        entries.push((context.freeze(), bls.entry.clone()));
+    }
+
+    Ok(entries)
+}