git describe

Cargo.toml

@@ -7,6 +7,9 @@ edition = "2021"
 
 [dependencies]
 
+[build-dependencies]
+git2 = { version = "0.19.0", default-features = false }
+
 [profile.release]
 strip = "symbols"
 lto = "fat"

build.rs

@@ -0,0 +1,24 @@
+use git2::{DescribeFormatOptions, DescribeOptions, Repository};
+
+fn main() {
+    let Ok(repo) = Repository::open(".") else {
+        return;
+    };
+    let Ok(git_describe_result) = repo
+        .describe(
+            DescribeOptions::new()
+                .describe_tags()
+                .show_commit_oid_as_fallback(true),
+        )
+        .and_then(|describe| {
+            describe.format(Some(
+                DescribeFormatOptions::new()
+                    .always_use_long_format(true)
+                    .dirty_suffix("-dirty"),
+            ))
+        })
+    else {
+        return;
+    };
+    println!("cargo::rustc-env=GIT_DESCRIBE={git_describe_result}")
+}

src/main.rs

@@ -1,5 +1,5 @@
 fn main() {
-    println!("Hello, world!!!");
+    println!("Hello, world!!! - {}", env!("GIT_DESCRIBE"));
     if cfg!(target_os = "macos") {
         println!("You are running macos!");
     } else if cfg!(target_os = "linux") {