feat(release): unify cross-platform versioning

crates/vnidrop/build.rs

@@ -0,0 +1,31 @@
+use std::{env, fs, path::PathBuf};
+
+fn main() {
+    let manifest_dir = PathBuf::from(env::var_os("CARGO_MANIFEST_DIR").unwrap());
+    let version_file = manifest_dir.join("../../version.properties");
+    println!("cargo:rerun-if-changed={}", version_file.display());
+
+    let contents = fs::read_to_string(&version_file)
+        .unwrap_or_else(|error| panic!("failed to read {}: {error}", version_file.display()));
+    let versions: Vec<_> = contents
+        .lines()
+        .filter_map(|line| line.strip_prefix("PRODUCT_VERSION="))
+        .collect();
+    assert_eq!(
+        versions.len(),
+        1,
+        "{} must contain exactly one PRODUCT_VERSION",
+        version_file.display()
+    );
+    let version = versions[0];
+    let components: Vec<_> = version.split('.').collect();
+    assert!(
+        components.len() == 3
+            && components.iter().all(|component| {
+                component.parse::<u16>().is_ok()
+                    && (component == &"0" || !component.starts_with('0'))
+            }),
+        "PRODUCT_VERSION must use canonical MAJOR.MINOR.PATCH integers"
+    );
+    println!("cargo:rustc-env=VNIDROP_PRODUCT_VERSION={version}");
+}

crates/vnidrop/src/handshake.rs

@@ -106,7 +106,7 @@ impl HandshakeClient {
                 transfer_name: metadata.transfer_name.clone(),
                 receiver_name: receiver_name.map(ToOwned::to_owned),
                 receiver_device_name: None,
-                app_version: env!("CARGO_PKG_VERSION").to_string(),
+                app_version: env!("VNIDROP_PRODUCT_VERSION").to_string(),
             })
             .await
     }