desktop: Use vergen to get version info

Cargo.lock

@@ -3741,6 +3741,7 @@ dependencies = [
  "tracing-tracy",
  "unic-langid",
  "url",
+ "vergen",
  "webbrowser",
  "wgpu",
  "winapi",
@@ -4967,6 +4968,17 @@ version = "0.8.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f1bddf1187be692e79c5ffeab891132dfb0f236ed36a43c7ed39f1165ee20191"
 
+[[package]]
+name = "vergen"
+version = "8.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3e884903ddba094df9bcdeb43b41170658bb4c2001ca8c47df7368244f4210ee"
+dependencies = [
+ "anyhow",
+ "rustversion",
+ "time",
+]
+
 [[package]]
 name = "version-compare"
 version = "0.1.1"

desktop/Cargo.toml

@@ -43,6 +43,7 @@ winapi = "0.3.9"
 
 [build-dependencies]
 embed-resource = "2"
+vergen = { version = "8.2.0", features = ["build", "git", "gitcl", "cargo"] }
 
 [features]
 default = ["software_video"]

desktop/build.rs

@@ -1,18 +1,14 @@
 use std::env;
-use std::fs::File;
-use std::io::Write;
-use std::path::{Path, PathBuf};
-use std::process::Command;
+use std::error::Error;
+use vergen::EmitBuilder;
 
-fn main() {
-    // This build script to generate Git version info is from the rustfmt project
-
-    // Only check .git/HEAD dirty status if it exists - doing so when
-    // building dependent crates may lead to false positives and rebuilds
-    println!("cargo:rerun-if-changed=build.rs");
-    if Path::new(".git/HEAD").exists() {
-        println!("cargo:rerun-if-changed=.git/HEAD");
-    }
+fn main() -> Result<(), Box<dyn Error>> {
+    // Emit version info, and "rerun-if-changed" for relevant files, including build.rs
+    EmitBuilder::builder()
+        .all_build()
+        .all_cargo()
+        .all_git()
+        .emit()?;
 
     // Embed resource file w/ icon on windows
     // To allow for cross-compilation, this must not be behind cfg(windows)!
@@ -20,33 +16,13 @@ fn main() {
     embed_resource::compile("assets/ruffle_desktop.rc", embed_resource::NONE);
 
     println!("cargo:rerun-if-env-changed=CFG_RELEASE_CHANNEL");
-    if option_env!("CFG_RELEASE_CHANNEL").map_or(true, |c| c == "nightly" || c == "dev") {
+    let channel = channel();
+    if channel == "nightly" || channel == "dev" {
         println!("cargo:rustc-cfg=nightly");
     }
+    println!("cargo:rustc-env=CFG_RELEASE_CHANNEL={channel}");
 
-    let out_dir: PathBuf = env::var_os("OUT_DIR")
-        .expect("OUT_DIR environment variable must be set and valid")
-        .into();
-
-    File::create(out_dir.join("version-info.txt"))
-        .expect("Must be able to create a file in OUT_DIR")
-        .write_all(commit_info().as_bytes())
-        .expect("Must be able to write to OUT_DIR");
-}
-
-// Try to get hash and date of the last commit on a best effort basis. If anything goes wrong
-// (git not installed or if this is not a git repository) just return an empty string.
-fn commit_info() -> String {
-    match (channel(), commit_hash(), commit_date()) {
-        (channel, Some(hash), Some(date)) => format!(
-            "{}-{} ({} {})",
-            option_env!("CARGO_PKG_VERSION").unwrap_or("unknown"),
-            channel,
-            hash.trim_end(),
-            date
-        ),
-        _ => String::new(),
-    }
+    Ok(())
 }
 
 fn channel() -> String {
@@ -56,19 +32,3 @@ fn channel() -> String {
         "nightly".to_owned()
     }
 }
-
-fn commit_hash() -> Option<String> {
-    Command::new("git")
-        .args(["rev-parse", "--short", "HEAD"])
-        .output()
-        .ok()
-        .and_then(|r| String::from_utf8(r.stdout).ok())
-}
-
-fn commit_date() -> Option<String> {
-    Command::new("git")
-        .args(["log", "-1", "--date=short", "--pretty=format:%cd"])
-        .output()
-        .ok()
-        .and_then(|r| String::from_utf8(r.stdout).ok())
-}

desktop/src/main.rs

@@ -40,7 +40,16 @@ thread_local! {
 static GLOBAL: tracing_tracy::client::ProfiledAllocator<std::alloc::System> =
     tracing_tracy::client::ProfiledAllocator::new(std::alloc::System, 0);
 
-static RUFFLE_VERSION: &str = include_str!(concat!(env!("OUT_DIR"), "/version-info.txt"));
+static RUFFLE_VERSION: &str = concat!(
+    env!("CARGO_PKG_VERSION"),
+    "-",
+    env!("CFG_RELEASE_CHANNEL"),
+    " (",
+    env!("VERGEN_GIT_SHA"),
+    " ",
+    env!("VERGEN_GIT_COMMIT_DATE"),
+    ")"
+);
 
 fn init() {
     // When linked with the windows subsystem windows won't automatically attach