Use custom unescape code and remove dep

Cargo.toml

@@ -14,11 +14,11 @@ clap = { version = "4", features = ["default", "derive"] }
 clap-verbosity-flag = "2"
 humantime = "2"
 bytes = "1"
+thiserror = "1"
 tokio = { version = "1", features = ["full"] }
 tokio-stream = "0.1"
 tokio-util = { version = "0.7", features = ["full"] }
 async-stream = "0.3"
-unescape = "0.1"
 udev = "0.8"
 bollard = "0.16"
 futures = "0.3"

src/dev/device.rs

@@ -42,7 +42,7 @@ impl Device {
             })
             .or_else(|| {
                 let vendor = self.device.property_value("ID_VENDOR_ENC")?.to_str()?;
-                let vendor = unescape::unescape(vendor)?;
+                let vendor = crate::util::escape::unescape_devnode(vendor).ok()?;
                 Some(vendor)
             })?;
 
@@ -57,7 +57,7 @@ impl Device {
             })
             .or_else(|| {
                 let model = self.device.property_value("ID_MODEL_ENC")?.to_str()?;
-                let model = unescape::unescape(model)?;
+                let model = crate::util::escape::unescape_devnode(model).ok()?;
                 Some(model)
             })?;
 

src/util/escape.rs

@@ -0,0 +1,32 @@
+#[derive(thiserror::Error, Debug)]
+#[error("Invalid escape sequence")]
+pub struct InvalidEscapeError;
+
+/// Unescape a udev-escaped devnode name.
+pub fn unescape_devnode(escaped: &str) -> Result<String, InvalidEscapeError> {
+    let mut result = String::with_capacity(escaped.len());
+    let mut iter = escaped.chars();
+
+    while let Some(c) = iter.next() {
+        if c != '\\' {
+            result.push(c);
+            continue;
+        }
+
+        // Udev escaped devnode names only use hexadecimal escapes, so we only need to handle those.
+        if iter.next() != Some('x') {
+            return Err(InvalidEscapeError);
+        }
+
+        let hex = iter.as_str().get(..2).ok_or(InvalidEscapeError)?;
+        result.push(
+            u8::from_str_radix(hex, 16)
+                .map_err(|_| InvalidEscapeError)?
+                .into(),
+        );
+        iter.next();
+        iter.next();
+    }
+
+    Ok(result)
+}

src/util/mod.rs

@@ -1 +1,2 @@
+pub mod escape;
 pub mod tty_mode_guard;