main.rs

//! https://github.com/martinvonz/jj/issues/2697

use std::path::Path;
use std::process::Command;

use gix::refs::transaction::{Change, PreviousValue, RefEdit};
use gix::ObjectId;

fn main() {
    let repo_path = Path::new("test-repo");
    {
        let repo = gix::init(repo_path).unwrap();
        let empty_tree_id =
            ObjectId::from_hex(b"4b825dc642cb6eb9a060e54bf8d69288fbee4904").unwrap();
        let commit_id1 = repo
            .commit(
                "refs/heads/main",
                "empty commit",
                empty_tree_id,
                [] as [ObjectId; 0],
            )
            .unwrap()
            .detach();

        // Create many refs to mmap() packed-refs
        let edits = (0..1000).map(|n| {
            let name = format!("refs/heads/feat-{n:04}");
            RefEdit {
                change: Change::Update {
                    log: Default::default(),
                    expected: PreviousValue::MustNotExist,
                    new: commit_id1.into(),
                },
                name: name.try_into().unwrap(),
                deref: false,
            }
        });
        repo.edit_references(edits).unwrap();
    }

    Command::new("git")
        .current_dir(repo_path)
        .args(["pack-refs", "--all"])
        .status()
        .unwrap();
    dbg!(repo_path.join(".git").join("packed-refs").metadata().unwrap().len());

    // Reopen the repo to ensure that the packed-refs file is read.
    {
        let repo = gix::open(repo_path).unwrap();
        let git_ref = repo.find_reference("refs/heads/feat-0000").unwrap();
        dbg!(&repo.refs);
        git_ref.delete().unwrap();
    }
}