fix: Benchy test without git code cannot output result

fil-proofs-tooling/Cargo.toml

@@ -49,6 +49,9 @@ humansize = "1.1.0"
 blstrs = "0.6.0"
 time = "0.3.9"
 
+[build-dependencies]
+vergen = "3.1.0"
+
 [features]
 default = ["opencl", "measurements"]
 cuda = [

fil-proofs-tooling/build.rs

@@ -0,0 +1,4 @@
+use vergen::{ConstantsFlags, generate_cargo_keys};
+fn main() {
+    generate_cargo_keys(ConstantsFlags::all()).expect("Unable to generate cargo keys!");
+}

fil-proofs-tooling/src/metadata.rs

@@ -1,6 +1,4 @@
 use anyhow::{anyhow, Result};
-use chrono::{DateTime, TimeZone, Utc};
-use git2::Repository;
 use serde::Serialize;
 
 /// Captures metadata about the current setup.
@@ -27,25 +25,14 @@ impl<T> Metadata<T> {
 #[serde(rename_all = "kebab-case")]
 pub struct GitMetadata {
     hash: String,
-    date: DateTime<Utc>,
+    date: String,
 }
 
 impl GitMetadata {
     pub fn new() -> Result<Self> {
-        let repo_path = if let Ok(mdir) = std::env::var("CARGO_MANIFEST_DIR") {
-            std::path::Path::new(&mdir).into()
-        } else {
-            std::env::current_dir()?
-        };
-        let repo = Repository::discover(repo_path)?;
-        let head = repo.head()?;
-        let commit = head.peel_to_commit()?;
-        // Unwrap is OK as the given seconds won't be out of range.
-        let date = Utc.timestamp_opt(commit.time().seconds(), 0).unwrap();
-
         Ok(GitMetadata {
-            hash: commit.id().to_string(),
-            date,
+            hash: env!("VERGEN_SHA").to_string(),
+            date: env!("VERGEN_COMMIT_DATE").to_string(),
         })
     }
 }