pallet revive: rpc build script should not panic

prdoc/pr_7786.prdoc

@@ -0,0 +1,35 @@
+title: 'pallet revive: rpc build script should not panic'
+doc:
+- audience: Runtime Dev
+  description: |-
+    This can error when you use `cargo remote` and probably also with `cargo vendor`.
+    Still seeing two more build errors, but at least this one is fixed.
+
+    Other one:
+    ```pre
+    error: set `DATABASE_URL` to use query macros online, or run `cargo sqlx prepare` to update the query cache
+       --> substrate/frame/revive/rpc/src/receipt_provider/db.rs:123:17
+        |
+    123 |               let result = query!(
+        |  __________________________^
+    124 | |                 r#"
+    125 | |                 INSERT OR REPLACE INTO transaction_hashes (transaction_hash, block_hash, transaction_index)
+    126 | |                 VALUES ($1, $2, $3)
+    ...   |
+    130 | |                 transaction_index
+    131 | |             )
+    ```
+
+    and (maybe Rust version related, this is 1.84.1)
+    ```pre
+    error[E0282]: type annotations needed
+       --> substrate/frame/revive/rpc/src/receipt_provider/db.rs:102:34
+        |
+    102 |         let (tx_result, logs_result) = tokio::join!(delete_transaction_hashes, delete_logs);
+        |                                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot infer type
+        |
+        = note: this error originates in the macro `$crate::join` which comes from the expansion of the macro `tokio::join` (in Nightly builds, run with -Z macro-backtrace for more info)
+    ```
+crates:
+- name: pallet-revive-eth-rpc
+  bump: patch

substrate/frame/revive/rpc/build.rs

@@ -33,12 +33,17 @@ fn main() {
 		.join("");
 	let target = std::env::var("TARGET").unwrap_or_else(|_| "unknown".to_string());
 
-	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 branch = head.shorthand().unwrap_or("unknown").to_string();
-	let id = &commit.id().to_string()[..7];
-	println!("cargo:rustc-env=GIT_REVISION={branch}-{id}");
+	let (branch, id) = if let Ok(repo) = git2::Repository::open("../../../..") {
+		let head = repo.head().expect("should have head");
+		let commit = head.peel_to_commit().expect("should have commit");
+		let branch = head.shorthand().unwrap_or("unknown").to_string();
+		let id = &commit.id().to_string()[..7];
+		(branch, id.to_string())
+	} else {
+		("unknown".to_string(), "unknown".to_string())
+	};
+
 	println!("cargo:rustc-env=RUSTC_VERSION={rustc_version}");
 	println!("cargo:rustc-env=TARGET={target}");
+	println!("cargo:rustc-env=GIT_REVISION={branch}-{id}");
 }