$ git clone -n https://src.fedoraproject.org/rpms/rust-async-std.git /var/lib/mock/f40-build-1661676-24218/root/chroot_tmpdir/scmroot/rust-async-std
Cloning into '/var/lib/mock/f40-build-1661676-24218/root/chroot_tmpdir/scmroot/rust-async-std'...
$ git fetch origin ce353a5ae0b1346d048bd1fd309e504664e11e80:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-async-std
 * [new ref]         ce353a5ae0b1346d048bd1fd309e504664e11e80 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ce353a5 Fix building tests with Rust 1.78+