Implement for {Free,Net,Open}BSD and Dragonfly

.github/workflows/rust.yml

@@ -76,6 +76,39 @@ jobs:
       - run: which wasm-pack || cargo install wasm-pack
       - run: wasm-pack test --node
 
+  build-cross:
+    strategy:
+      matrix:
+        target: [x86_64-unknown-freebsd, x86_64-unknown-netbsd]
+    runs-on: ubuntu-latest
+    name: "Build for ${{ matrix.target }}"
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Install Rust
+        id: actions-rs
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+          target: ${{ matrix.target }}
+      - name: Cache
+        uses: actions/cache@v3
+        with:
+          key: ${{ runner.os }}-${{ matrix.target }}-${{ steps.actions-rs.outputs.rustc_hash }}-${{ hashFiles('Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-${{ matrix.target }}-${{ steps.actions-rs.outputs.rustc_hash }}-
+            ${{ runner.os }}-${{ matrix.target }}-
+          path: |
+            ~/.cargo/registry/index/
+            ~/.cargo/registry/cache/
+            ~/.cargo/git/db/
+            ~/.cargo/bin/
+            target/
+      - run: which cross || cargo install cross
+      - run: cross build --target ${{ matrix.target }} --examples
+
   check:
     strategy:
       matrix:

src/lib.rs

@@ -38,6 +38,16 @@ mod tz_wasm32;
 #[cfg(target_arch = "wasm32")]
 use tz_wasm32 as platform;
 
+#[cfg(any(target_os = "freebsd", target_os = "dragonfly"))]
+mod tz_freebsd;
+#[cfg(any(target_os = "freebsd", target_os = "dragonfly"))]
+use tz_freebsd as platform;
+
+#[cfg(any(target_os = "netbsd", target_os = "openbsd"))]
+mod tz_netbsd;
+#[cfg(any(target_os = "netbsd", target_os = "openbsd"))]
+use tz_netbsd as platform;
+
 /// Error types
 #[derive(Debug)]
 pub enum GetTimezoneError {

src/tz_freebsd.rs

@@ -0,0 +1,7 @@
+pub(crate) fn get_timezone_inner() -> Result<String, crate::GetTimezoneError> {
+    // see https://gitlab.gnome.org/GNOME/evolution-data-server/-/issues/19
+    let mut contents = std::fs::read_to_string("/var/db/zoneinfo")?;
+    // Trim to the correct length without allocating.
+    contents.truncate(contents.trim_end().len());
+    Ok(contents)
+}

src/tz_netbsd.rs

@@ -0,0 +1,18 @@
+use std::fs::read_link;
+
+const PREFIX: &str = "/usr/share/zoneinfo/";
+
+pub(crate) fn get_timezone_inner() -> Result<String, crate::GetTimezoneError> {
+    // see https://www.cyberciti.biz/faq/openbsd-time-zone-howto/
+    let mut s = read_link("/etc/localtime")?
+        .into_os_string()
+        .into_string()
+        .map_err(|_| crate::GetTimezoneError::FailedParsingString)?;
+    if !s.starts_with(PREFIX) {
+        return Err(crate::GetTimezoneError::FailedParsingString);
+    }
+
+    // Trim to the correct length without allocating.
+    s.replace_range(..PREFIX.len(), "");
+    Ok(s)
+}