Add udev_hwdb feature and fix cross build with feature enabled

.github/workflows/build.yml

@@ -21,10 +21,10 @@ jobs:
       fail-fast: false
       matrix:
         job:
-          # - { os: ubuntu-latest, target: aarch64-unknown-linux-gnu, use-cross: true }
-          - { os: ubuntu-latest, target: x86_64-pc-windows-gnu, use-cross: true }
-          - { os: ubuntu-latest, target: x86_64-unknown-linux-gnu, use-cross: false }
-          - { os: macos-latest, target: universal-apple-darwin, use-cross: false }
+          - { os: ubuntu-latest, target: aarch64-unknown-linux-gnu, use-cross: true, feature-flags: "--all-features" }
+          - { os: ubuntu-latest, target: x86_64-pc-windows-gnu, use-cross: true, feature-flags: "--all-features"  }
+          - { os: ubuntu-latest, target: x86_64-unknown-linux-gnu, use-cross: false, feature-flags: "--all-features"  }
+          - { os: macos-latest, target: universal-apple-darwin, use-cross: false, feature-flags: "--all-features"  }
     steps:
       - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@v1
@@ -90,14 +90,14 @@ jobs:
         run: |
           case ${{ matrix.job.target }} in
             universal-apple-*) 
-              cargo build --locked --release --all-features --target=aarch64-apple-darwin
-              cargo build --locked --release --all-features --target=x86_64-apple-darwin
+              cargo build --locked --release ${{ matrix.job.feature-flags }} --target=aarch64-apple-darwin
+              cargo build --locked --release ${{ matrix.job.feature-flags }} --target=x86_64-apple-darwin
               mkdir -p target/universal-apple-darwin/release
               # merge into universal
               lipo -create -output target/universal-apple-darwin/release/cyme target/aarch64-apple-darwin/release/cyme target/x86_64-apple-darwin/release/cyme
               ;;
             *) 
-              ${{ env.CARGO_CMD }} build --locked --release --all-features --target=${{ matrix.job.target }}
+              ${{ env.CARGO_CMD }} build --locked --release ${{ matrix.job.feature-flags }} --target=${{ matrix.job.target }}
               ;;
           esac
 

Cargo.toml

@@ -16,7 +16,7 @@ clap = { version = "4.0.22", features = ["derive", "wrap_help"] }
 colored = "2.0.0"
 itertools = "0.10.5"
 lazy_static = "1.4.0"
-rusb = { git = "https://github.com/tuna-f1sh/rusb.git", version = "0.9.1", optional = true }
+rusb = { version = "0.9.1", optional = true }
 log = "0.4.17"
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0.87"
@@ -32,25 +32,30 @@ terminal_size = "0.2.5"
 strum = "0.24.1"
 strum_macros = "0.24.3"
 
+[patch.crates-io]
+libudev-sys = { git = "https://github.com/Emilgardis/libudev-sys/", branch = "fix-cross-compilation" }
+rusb = { git = "https://github.com/a1ien/rusb.git" }
+
 [dev-dependencies]
 diff = "0.1"
 assert-json-diff = "2.0.2"
 
 [target.x86_64-unknown-linux-gnu.dependencies]
-udev = { version = "^0.8.0", optional = true, features = ["hwdb"] }
-rusb = { git = "https://github.com/tuna-f1sh/rusb.git", version = "0.9.1" }
+udev = { version = "^0.8.0", optional = true }
+rusb = "0.9.1"
 
 [target.arm-unknown-linux-gnueabihf.dependencies]
-udev = { version = "^0.8.0", optional = true, features = ["hwdb"] }
-rusb = { git = "https://github.com/tuna-f1sh/rusb.git", version = "0.9.1" }
+udev = { version = "^0.8.0", optional = true }
+rusb = "0.9.1"
 
 [target.aarch64-unknown-linux-gnu.dependencies]
-udev = { version = "^0.8.0", optional = true, features = ["hwdb"] }
-rusb = { git = "https://github.com/tuna-f1sh/rusb.git", version = "0.9.1" }
+udev = { version = "^0.8.0", optional = true }
+rusb = "0.9.1"
 
 [features]
 libusb = ["dep:rusb"]
 udev = ["dep:udev"]
+udev_hwdb = ["udev/hwdb"]
 usb_test = []
 cli_generate = ["dep:clap_complete", "dep:clap_mangen"] # for generating man and completions
 default = ["libusb"]
@@ -65,6 +70,9 @@ strip = true
 panic = "abort"
 codegen-units = 1 # quicker binary, slower build
 
+# [package.metadata.cross.build]
+# pre-build = ["dpkg --add-architecture $CROSS_DEB_ARCH && apt-get update && apt-get install --assume-yes libusb-1.0-0-dev:$CROSS_DEB_ARCH libudev-dev:$CROSS_DEB_ARCH"]
+
 [package.metadata.cross.target.arm-unknown-linux-gnueabihf]
 pre-build = ["dpkg --add-architecture armhf && apt-get update && apt-get install --assume-yes libusb-1.0-0-dev:armhf libudev-dev:armhf"]
 

README.md

@@ -45,7 +45,7 @@ The name comes from the technical term for the type of blossom on a Apple tree:
 ## Requirements
 
 * Linux/Windows and pre-compiled targets require [libusb 1.0.0](https://libusb.info): `brew install libusb`, `sudo apt install libusb-1.0-0-dev` or one's package manager of choice.
-* Linux pre-compiled and `--features udev` requires 'libudev-dev': `sudo apt install libudev-dev` or one's package manager of choice.
+* Linux pre-compiled and `--features udev`/`--features udev_hwdb` requires 'libudev-dev': `sudo apt install libudev-dev` or one's package manager of choice.
 
 For pre-compiled binaries, see the [releases](https://github.com/tuna-f1sh/cyme/releases).
 
@@ -68,7 +68,9 @@ More package managers to come/package distribution, please feel free to create a
 
 ## Linux udev
 
-To obtain device and interface drivers being used on Linux like `lsusb`, one must install 'libudev-dev' via a package manager and the `--features udev` feature when building. Only supported on Linux targets.
+To obtain device and interface drivers being used on Linux like `lsusb`, one must install 'libudev-dev' via a package manager and the `--features udev` feature when building. To lookup USB IDs from the udev hwdb as well (like `lsusb`) use `--features udev_hwdb`. Without hwdb, `cyme` will use the 'usb-ids' crate, which is the same source as the hwdb binary data but the bundled hwdb may differ due to customisations or last update ('usb-ids' will be most up to date).
+
+Only supported on Linux targets.
 
 ## Alias `lsusb`
 

src/lib.rs

@@ -45,8 +45,7 @@ pub mod icon;
 pub mod lsusb;
 pub mod system_profiler;
 pub mod types;
-#[cfg(target_os = "linux")]
-#[cfg(feature = "udev")]
+#[cfg(all(target_os = "linux", feature = "udev"))]
 pub mod udev;
 pub mod usb;
 

src/lsusb.rs

@@ -830,15 +830,17 @@ pub mod names {
     }
 
     /// Wrapper around [`crate::udev::hwdb_get`] so that it can be 'used' without feature
+    ///
+    /// Returns `Err` not `None` if feature is not enabled so that with unwrap_or hwdb can still return `None` if no match in db
     #[allow(unused_variables)]
     fn hwdb_get(modalias: &str, key: &'static str) -> Result<Option<String>, Error> {
-        #[cfg(all(target_os = "linux", feature = "udev"))]
-        return crate::udev::hwdb_get(modalias, key);
+        #[cfg(all(target_os = "linux", feature = "udev_hwdb"))]
+        return crate::udev::hwdb::get(modalias, key);
 
-        #[cfg(not(all(target_os = "linux", feature = "udev")))]
+        #[cfg(not(all(target_os = "linux", feature = "udev_hwdb")))]
         return Err(Error::new(
             ErrorKind::Unsupported,
-            "hwdb_get requires 'udev' feature",
+            "hwdb_get requires 'udev_hwdb' feature",
         ));
     }
 }

src/udev.rs

@@ -124,34 +124,41 @@ pub fn get_udev_attribute<T: AsRef<std::ffi::OsStr> + std::fmt::Display>(
         .map(|s| s.to_str().unwrap_or("").to_string()))
 }
 
-/// Lookup an entry in the udev hwdb given the `modalias` and `key`.
+/// udev hwdb lookup functions
 ///
-/// Should act like https://github.com/gregkh/usbutils/blob/master/names.c#L115
-///
-/// ```
-/// use cyme::udev::hwdb_get;
-///
-/// let modalias = "usb:v1D6Bp0001";
-/// let vendor = hwdb_get(&modalias, "ID_VENDOR_FROM_DATABASE").unwrap();
-///
-/// assert_eq!(vendor, Some("Linux Foundation".into()));
-///
-/// let modalias = "usb:v*p*d*dc03dsc01dp01*";
-/// let vendor = hwdb_get(&modalias, "ID_USB_PROTOCOL_FROM_DATABASE").unwrap();
-///
-/// assert_eq!(vendor, Some("Keyboard".into()));
-/// ```
-pub fn hwdb_get(modalias: &str, key: &'static str) -> Result<Option<String>, Error> {
-    let hwdb = udevlib::Hwdb::new().map_err(|e| {
-        Error::new(
-            ErrorKind::Udev,
-            &format!("Failed to get hwdb: Error({})", e),
-        )
-    })?;
+/// Protected by the `udev_hwdb` feature because 'libudev-sys' excludes hwdb ffi bindings if native udev does not support hwdb
+#[cfg(feature = "udev_hwdb")]
+pub mod hwdb {
+    use super::*;
+    /// Lookup an entry in the udev hwdb given the `modalias` and `key`.
+    ///
+    /// Should act like https://github.com/gregkh/usbutils/blob/master/names.c#L115
+    ///
+    /// ```
+    /// use cyme::udev;
+    ///
+    /// let modalias = "usb:v1D6Bp0001";
+    /// let vendor = hwdb::get(&modalias, "ID_VENDOR_FROM_DATABASE").unwrap();
+    ///
+    /// assert_eq!(vendor, Some("Linux Foundation".into()));
+    ///
+    /// let modalias = "usb:v*p*d*dc03dsc01dp01*";
+    /// let vendor = hwdb::get(&modalias, "ID_USB_PROTOCOL_FROM_DATABASE").unwrap();
+    ///
+    /// assert_eq!(vendor, Some("Keyboard".into()));
+    /// ```
+    pub fn get(modalias: &str, key: &'static str) -> Result<Option<String>, Error> {
+        let hwdb = udevlib::Hwdb::new().map_err(|e| {
+            Error::new(
+                ErrorKind::Udev,
+                &format!("Failed to get hwdb: Error({})", e),
+            )
+        })?;
 
-    Ok(hwdb
-        .query_one(&modalias.to_string(), &key.to_string())
-        .map(|s| s.to_str().unwrap_or("").to_string()))
+        Ok(hwdb
+            .query_one(&modalias.to_string(), &key.to_string())
+            .map(|s| s.to_str().unwrap_or("").to_string()))
+    }
 }
 
 #[cfg(test)]