jj/build.rs

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// Copyright 2023 The Jujutsu Authors
//
// 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
//
// https://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.
use std::process::Command;
use std::str;
use cargo_metadata::MetadataCommand;
fn main() -> std::io::Result<()> {
let path = std::env::var("CARGO_MANIFEST_DIR").unwrap();
let meta = MetadataCommand::new()
.manifest_path("./Cargo.toml")
.current_dir(&path)
.exec()
.unwrap();
let root = meta.root_package().unwrap();
let version = &root.version;
if let Some(git_hash) = get_git_hash() {
println!("cargo:rustc-env=JJ_VERSION={}-{}", version, git_hash);
} else {
println!("cargo:rustc-env=JJ_VERSION={}", version);
}
Ok(())
}
fn get_git_hash() -> Option<String> {
if let Ok(output) = Command::new("jj")
.args([
"--ignore-working-copy",
"--color=never",
"log",
"--no-graph",
"-r=@-",
"-T=commit_id",
])
.output()
{
if output.status.success() {
println!("cargo:rerun-if-changed=.jj/repo/op_heads/heads/");
return Some(String::from_utf8(output.stdout).unwrap());
}
}
if let Ok(output) = Command::new("git").args(["rev-parse", "HEAD"]).output() {
if output.status.success() {
println!("cargo:rerun-if-changed=.git/HEAD");
let line = str::from_utf8(&output.stdout).unwrap();
return Some(line.trim_end().to_owned());
}
}
None
}