lib: replace protobuf crate with prost

lib/Cargo.toml

@@ -14,7 +14,7 @@ readme = "../README.md"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [build-dependencies]
-protobuf-codegen = "3.2.0"
+prost-build = "0.11.5"
 version_check = "0.9.4"
 
 [dependencies]
@@ -32,7 +32,6 @@ maplit = "1.0.2"
 once_cell = "1.16.0"
 pest = "2.5.1"
 pest_derive = "2.5.1"
-protobuf = { version = "3.0.1", features = ["with-bytes"] }
 regex = "1.7.0"
 serde_json = "1.0.91"
 tempfile = "3.3.0"
@@ -42,6 +41,7 @@ uuid = { version = "1.2.2", features = ["v4"] }
 whoami = "1.2.3"
 zstd = "0.12.1"
 tracing = "0.1.37"
+prost = "0.11.5"
 
 [dev-dependencies]
 assert_matches = "1.5.0"

lib/build.rs

@@ -12,18 +12,14 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-fn main() {
+fn main() -> std::io::Result<()> {
     let input = &[
         "src/protos/op_store.proto",
         "src/protos/store.proto",
         "src/protos/working_copy.proto",
     ];
-    protobuf_codegen::Codegen::new()
-        .pure()
-        .inputs(input)
-        .include("src/protos")
-        .cargo_out_dir("protos")
-        .run_from_script();
+    prost_build::compile_protos(input, &["src/protos/"])?;
+
     println!("cargo:rerun-if-changed=build.rs");
     for file in input {
         println!("cargo:rerun-if-changed={file}");
@@ -32,4 +28,6 @@ fn main() {
     if let Some(true) = version_check::supports_feature("map_first_last") {
         println!("cargo:rustc-cfg=feature=\"map_first_last\"");
     }
+
+    Ok(())
 }

lib/src/git_backend.rs

@@ -20,7 +20,7 @@ use std::sync::{Arc, Mutex};
 
 use git2::Oid;
 use itertools::Itertools;
-use protobuf::Message;
+use prost::Message;
 use uuid::Uuid;
 
 use crate::backend::{
@@ -126,17 +126,16 @@ fn signature_to_git(signature: &Signature) -> git2::Signature {
 }
 
 fn serialize_extras(commit: &Commit) -> Vec<u8> {
-    let mut proto = crate::protos::store::Commit::new();
+    let mut proto = crate::protos::store::Commit::default();
     proto.change_id = commit.change_id.to_bytes();
     for predecessor in &commit.predecessors {
         proto.predecessors.push(predecessor.to_bytes());
     }
-    proto.write_to_bytes().unwrap()
+    proto.encode_to_vec()
 }
 
 fn deserialize_extras(commit: &mut Commit, bytes: &[u8]) {
-    let mut cursor = Cursor::new(bytes);
-    let proto: crate::protos::store::Commit = Message::parse_from_reader(&mut cursor).unwrap();
+    let proto = crate::protos::store::Commit::decode(bytes).unwrap();
     commit.change_id = ChangeId::new(proto.change_id);
     for predecessor in &proto.predecessors {
         commit.predecessors.push(CommitId::from_bytes(predecessor));