Add (short) commit hash and build time to version hash

crunchy-cli-core/build.rs

@@ -0,0 +1,33 @@
+fn main() -> std::io::Result<()> {
+    println!(
+        "cargo:rustc-env=GIT_HASH={}",
+        get_short_commit_hash()?.unwrap_or_default()
+    );
+    println!(
+        "cargo:rustc-env=BUILD_DATE={}",
+        chrono::Utc::now().format("%F")
+    );
+
+    Ok(())
+}
+
+fn get_short_commit_hash() -> std::io::Result<Option<String>> {
+    let git = std::process::Command::new("git")
+        .arg("rev-parse")
+        .arg("--short")
+        .arg("HEAD")
+        .output();
+
+    match git {
+        Ok(cmd) => Ok(Some(
+            String::from_utf8_lossy(cmd.stdout.as_slice()).to_string(),
+        )),
+        Err(e) => {
+            if e.kind() != std::io::ErrorKind::NotFound {
+                Err(e)
+            } else {
+                Ok(None)
+            }
+        }
+    }
+}