add global git hash constant

client/src/lib.rs

@@ -66,6 +66,15 @@ impl Client {
                 entity_uid,
                 server_info,
             }) => {
+                // TODO: Voxygen should display this.
+                if server_info.git_hash != common::util::GIT_HASH.to_string() {
+                    log::warn!(
+                        "Git hash mismatch between client and server: {} vs {}",
+                        server_info.git_hash,
+                        common::util::GIT_HASH
+                    );
+                }
+
                 let state = State::from_state_package(ecs_state);
                 let entity = state
                     .ecs()

common/build.rs

@@ -0,0 +1,29 @@
+use std::env;
+use std::fs::File;
+use std::io::Write;
+use std::path::Path;
+use std::process::Command;
+
+fn main() {
+    match Command::new("git")
+        .args(&["rev-parse", "--short", "HEAD"])
+        .output()
+    {
+        Ok(output) => match String::from_utf8(output.stdout) {
+            Ok(hash) => {
+                let mut target = File::create(
+                    Path::new(
+                        &env::var("OUT_DIR").expect("failed to query OUT_DIR environment variable"),
+                    )
+                    .join("githash"),
+                )
+                .expect("failed to create git hash file!");
+                target
+                    .write_all(hash.trim().as_bytes())
+                    .expect("failed to write to file!");
+            }
+            Err(e) => panic!("failed to convert git output to UTF-8: {}", e),
+        },
+        Err(e) => panic!("failed to retrieve current git commit hash: {}", e),
+    }
+}

common/src/msg/server.rs

@@ -18,6 +18,7 @@ pub enum RequestStateError {
 pub struct ServerInfo {
     pub name: String,
     pub description: String,
+    pub git_hash: String,
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize)]

common/src/util/mod.rs

@@ -1 +1 @@
-
+pub const GIT_HASH: &str = include_str!(concat!(env!("OUT_DIR"), "/githash"));

server/src/lib.rs

@@ -106,6 +106,7 @@ impl Server {
             server_info: ServerInfo {
                 name: settings.server_name.clone(),
                 description: settings.server_description.clone(),
+                git_hash: common::util::GIT_HASH.to_string(),
             },
             server_settings: settings,
         };

voxygen/build.rs

@@ -1,14 +0,0 @@
-use std::process::Command;
-
-fn main() {
-    match Command::new("git")
-        .args(&["rev-parse", "--short", "HEAD"])
-        .output()
-    {
-        Ok(output) => match String::from_utf8(output.stdout) {
-            Ok(hash) => println!("cargo:rustc-env=GIT_HASH={}", hash),
-            Err(e) => println!("failed to convert git output to UTF-8: {}", e),
-        },
-        Err(e) => println!("failed to retrieve current git commit hash: {}", e),
-    }
-}

voxygen/src/hud/mod.rs

@@ -322,10 +322,7 @@ impl Hud {
         let mut events = Vec::new();
         let ref mut ui_widgets = self.ui.set_widgets();
 
-        let version = match std::env::var("GIT_HASH") {
-            Ok(hash) => format!("{}-{}", env!("CARGO_PKG_VERSION"), hash),
-            Err(_) => env!("CARGO_PKG_VERSION").to_owned(),
-        };
+        let version = format!("{}-{}", env!("CARGO_PKG_VERSION"), common::util::GIT_HASH);
 
         // Nametags and healthbars
         if self.show.ingame {