Add a coldplug utility

src/bin/mdev-coldplug.rs

@@ -0,0 +1,49 @@
+use std::path::PathBuf;
+
+use clap::Parser;
+use mdev::setup_log;
+use tracing::{debug, error};
+use walkdir::WalkDir;
+
+#[derive(Parser)]
+struct Opt {
+    /// Verbose mode, logs to stderr
+    #[arg(short, long, action = clap::ArgAction::Count)]
+    verbose: u8,
+
+    /// Path where the sysfs is mounted
+    #[arg(short, long, default_value = "/sys")]
+    sysfs_mount: PathBuf,
+}
+
+impl Opt {
+    fn setup_log(&self) -> anyhow::Result<()> {
+        setup_log(self.verbose)
+    }
+}
+
+fn main() -> anyhow::Result<()> {
+    let opt = Opt::parse();
+
+    opt.setup_log()?;
+
+    let classdir = WalkDir::new(opt.sysfs_mount.join("class"))
+        .follow_links(true)
+        .max_depth(4)
+        .into_iter();
+    let busdir = WalkDir::new(opt.sysfs_mount.join("bus"))
+        .follow_links(true)
+        .max_depth(3)
+        .into_iter();
+
+    for entry in classdir
+        .chain(busdir)
+        .filter_map(|e| e.ok().filter(|e| e.file_name().eq("uevent")))
+    {
+        debug!("{entry:?}");
+        let p = entry.path();
+        std::fs::write(p, "add").unwrap_or_else(|e| error!("cannot write to {}: {e}", p.display()));
+    }
+
+    Ok(())
+}