Include git info into docker build, show git ref at version (#3829)

* ci: include .git directory into build

* p2p: include git ref into version for user agent, show git commit hash instead of last tag into log

* p2p: do not show anything after version if git commit hash is empty

* fix: user agent typo

p2p/Cargo.toml

@@ -8,6 +8,7 @@ repository = "https://github.com/mimblewimble/grin"
 keywords = [ "crypto", "grin", "mimblewimble" ]
 workspace = ".."
 edition = "2018"
+build = "src/build/build.rs"
 
 [dependencies]
 bitflags = "1"
@@ -29,3 +30,6 @@ grin_chain = { path = "../chain", version = "5.4.0" }
 
 [dev-dependencies]
 grin_pool = { path = "../pool", version = "5.4.0" }
+
+[build-dependencies]
+built = { version = "0.8.0", features = ["git2"]}

p2p/src/build/build.rs

@@ -0,0 +1,28 @@
+// Copyright 2026 The Grin Developers
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! Build hooks to spit out version info
+
+use std::env;
+use std::path::Path;
+
+fn main() {
+	// build and versioning information
+	let out_dir_path = format!("{}{}", env::var("OUT_DIR").unwrap(), "/built.rs");
+	// don't fail the build if something's missing, may just be cargo release
+	let _ = built::write_built_file_with_opts(
+		Some(Path::new(env!("CARGO_MANIFEST_DIR"))),
+		Path::new(&out_dir_path),
+	);
+}

p2p/src/handshake.rs

@@ -16,7 +16,7 @@ use crate::conn::Tracker;
 use crate::core::core::hash::Hash;
 use crate::core::pow::Difficulty;
 use crate::core::ser::ProtocolVersion;
-use crate::msg::{read_message, write_message, Hand, Msg, Shake, Type, USER_AGENT};
+use crate::msg::{read_message, user_agent, write_message, Hand, Msg, Shake, Type};
 use crate::peer::Peer;
 use crate::types::{Capabilities, Direction, Error, P2PConfig, PeerAddr, PeerInfo, PeerLiveInfo};
 use crate::util::RwLock;
@@ -120,7 +120,7 @@ impl Handshake {
 			total_difficulty,
 			sender_addr: self_addr,
 			receiver_addr: peer_addr,
-			user_agent: USER_AGENT.to_string(),
+			user_agent: user_agent().to_string(),
 		};
 
 		// write and read the handshake response
@@ -225,7 +225,7 @@ impl Handshake {
 			capabilities: capab,
 			genesis: self.genesis,
 			total_difficulty: total_difficulty,
-			user_agent: USER_AGENT.to_string(),
+			user_agent: user_agent().to_string(),
 		};
 
 		let msg = Msg::new(Type::Shake, shake, negotiated_version)?;

p2p/src/msg.rs

@@ -40,8 +40,19 @@ use std::io::{Read, Write};
 use std::sync::Arc;
 use std::{fmt, thread, time::Duration};
 
+// include build information
+pub mod built_info {
+	include!(concat!(env!("OUT_DIR"), "/built.rs"));
+}
+
 /// Grin's user agent with current version
-pub const USER_AGENT: &str = concat!("MW/Grin ", env!("CARGO_PKG_VERSION"));
+pub fn user_agent() -> String {
+	format!(
+		"MW/Grin {}{}",
+		env!("CARGO_PKG_VERSION"),
+		built_info::GIT_COMMIT_HASH_SHORT.map_or_else(|| "".to_owned(), |v| ".".to_owned() + v)
+	)
+}
 
 /// Magic numbers expected in the header of every message
 const OTHER_MAGIC: [u8; 2] = [73, 43];

p2p/tests/peer_handshake.rs

@@ -25,6 +25,7 @@ use std::{thread, time};
 use crate::core::core::hash::Hash;
 use crate::core::global;
 use crate::core::pow::Difficulty;
+use crate::p2p::msg::built_info;
 use crate::p2p::types::PeerAddr;
 use crate::p2p::Peer;
 
@@ -88,7 +89,12 @@ fn peer_handshake() {
 	)
 	.unwrap();
 
-	assert!(peer.info.user_agent.ends_with(env!("CARGO_PKG_VERSION")));
+	let git_hash =
+		built_info::GIT_COMMIT_HASH_SHORT.map_or_else(|| "".to_owned(), |v| ".".to_owned() + v);
+	assert!(peer
+		.info
+		.user_agent
+		.ends_with(format!("{}{}", env!("CARGO_PKG_VERSION"), git_hash).as_str()));
 
 	thread::sleep(time::Duration::from_secs(1));