allow device matching by udev properties

src/utils.rs

@@ -2,6 +2,8 @@ use log::error;
 use std::collections::BTreeSet as Set;
 use std::sync::LazyLock;
 
+use crate::udev;
+
 static CMDLINE: LazyLock<String> = LazyLock::new(|| {
     std::fs::read("/proc/cmdline")
         .inspect_err(|e| error!("failed to read kernel cmdline: {e}"))
@@ -88,3 +90,24 @@ pub fn select_n_by_regex<'t>(
         nas.take(n as usize).collect()
     }
 }
+
+pub async fn select_n_by_udev<'t>(
+    n: i16,
+    subsystem: &str,
+    result_property: &str,
+    filter: &udev::Filter,
+    in_use: &Set<String>,
+) -> eyre::Result<Vec<String>> {
+    let devs = udev::all().await?;
+    let nas = devs
+        .of_subsystem(subsystem)
+        .filter(|dev| filter.matches(dev))
+        .filter_map(|dev| Some(dev.property(result_property)?.to_string()))
+        .filter(|name| !in_use.contains(name));
+
+    Ok(if n == -1 {
+        nas.collect()
+    } else {
+        nas.take(n as usize).collect()
+    })
+}