fix the commit sha in the version (#129)

Signed-off-by: xermicus <cyrill@parity.io>

crates/solidity/Cargo.toml

@@ -48,6 +48,9 @@ mimalloc = { version = "*", default-features = false }
 libc = { workspace = true }
 inkwell = { workspace = true, features = ["target-riscv", "llvm18-0-no-llvm-linking"]}
 
+[build-dependencies]
+git2 = { workspace = true }
+
 [features]
 parallel = ["rayon"]
 default = ["parallel"]

crates/solidity/build.rs

@@ -1,9 +1,7 @@
 fn main() {
-    let git_rev = std::process::Command::new("git")
-        .args(["rev-parse", "--short", "HEAD"])
-        .output()
-        .map(|out| String::from_utf8(out.stdout).unwrap_or_default())
-        .unwrap_or("unknown".to_owned());
-
-    println!("cargo:rustc-env=GIT_COMMIT_HASH={}", git_rev.trim());
+    let repo = git2::Repository::open("../..").expect("should be a repository");
+    let head = repo.head().expect("should have head");
+    let commit = head.peel_to_commit().expect("should have commit");
+    let id = &commit.id().to_string()[..7];
+    println!("cargo:rustc-env=GIT_COMMIT_HASH={id}");
 }