xtask: Install a simple logger

This currently doesn't do anything, but in the next commit ovmf-prebuilt will be
used to download OVMF files, and that library uses the logger.

xtask/Cargo.toml

@@ -12,6 +12,7 @@ fatfs = { version = "0.3.6", default-features = false, features = ["alloc", "std
 fs-err = "3.0.0"
 heck = "0.5.0"
 itertools = "0.13.0"
+log.workspace = true
 lzma-rs = "0.3.0"
 mbrman = "0.5.1"
 nix = { version = "0.29.0", default-features = false, features = ["fs"] }
@@ -24,5 +25,5 @@ sha2 = "0.10.6"
 syn = { version = "2.0.0", features = ["full"] }
 tar = "0.4.38"
 tempfile = "3.6.0"
-walkdir = "2.4.0"
 ureq = "2.8.0"
+walkdir = "2.4.0"

xtask/src/main.rs

@@ -17,6 +17,7 @@ use arch::UefiArch;
 use cargo::{Cargo, CargoAction, Feature, Package, TargetTypes};
 use clap::Parser;
 use itertools::Itertools;
+use log::{LevelFilter, Metadata, Record};
 use opt::{Action, BuildOpt, ClippyOpt, CovOpt, DocOpt, Opt, QemuOpt, TpmVersion};
 use std::process::Command;
 use util::run_cmd;
@@ -322,9 +323,33 @@ fn has_cmd(target_cmd: &str) -> bool {
     run_cmd(cmd).is_ok()
 }
 
+fn install_logger() {
+    struct Logger;
+
+    impl log::Log for Logger {
+        fn enabled(&self, _: &Metadata) -> bool {
+            true
+        }
+
+        fn log(&self, record: &Record) {
+            println!("[{}] {}", record.level(), record.args());
+        }
+
+        fn flush(&self) {}
+    }
+
+    static LOGGER: Logger = Logger;
+
+    log::set_logger(&LOGGER)
+        .map(|()| log::set_max_level(LevelFilter::Info))
+        .unwrap();
+}
+
 fn main() -> Result<()> {
     let opt = Opt::parse();
 
+    install_logger();
+
     match &opt.action {
         Action::Build(build_opt) => build(build_opt),
         Action::CheckRaw(_) => check_raw::check_raw(),