Replace artifact dependency with build script

Artifact dependencies and `-Zbuild-std` don't work together yet.

Author: phil-opp

Cargo.toml

@@ -32,6 +32,12 @@ json = "0.12.4"
 fatfs = "0.3.4"
 gpt = "3.0.0"
 
+# [dependencies.bootloader-x86_64-uefi]
+# version = "0.1.0"
+# path = "uefi"
+# artifact = ["bin"]
+# target = "x86_64-unknown-uefi"
+
 [build-dependencies]
 llvm-tools-build = { version = "0.1", optional = true, package = "llvm-tools" }
 toml = { version = "0.5.1", optional = true }

build.rs

@@ -0,0 +1,42 @@
+use std::{
+    path::{Path, PathBuf},
+    process::Command,
+};
+
+fn main() {
+    let out_dir = PathBuf::from(std::env::var("OUT_DIR").unwrap());
+
+    let uefi_path = build_uefi_bootloader(&out_dir);
+
+    println!(
+        "cargo:rustc-env=UEFI_BOOTLOADER_PATH={}",
+        uefi_path.display()
+    );
+}
+
+fn build_uefi_bootloader(out_dir: &Path) -> PathBuf {
+    let cargo = std::env::var("CARGO").unwrap_or_else(|_| "cargo".into());
+    let mut cmd = Command::new(cargo);
+    cmd.arg("install").arg("bootloader-x86_64-uefi");
+    // TODO: remove, only for testing, replace by `--version`
+    cmd.arg("--path").arg("uefi");
+    cmd.arg("--locked");
+    cmd.arg("--target").arg("x86_64-unknown-uefi");
+    cmd.arg("-Zbuild-std=core")
+        .arg("-Zbuild-std-features=compiler-builtins-mem");
+    cmd.arg("--root").arg(out_dir);
+    cmd.env_remove("RUSTFLAGS");
+    let status = cmd
+        .status()
+        .expect("failed to run cargo install for uefi bootloader");
+    if status.success() {
+        let path = out_dir.join("bin").join("bootloader-x86_64-uefi.efi");
+        assert!(
+            path.exists(),
+            "uefi bootloader executable does not exist after building"
+        );
+        path
+    } else {
+        panic!("failed to build uefi bootloader");
+    }
+}