$ git clone -n https://src.fedoraproject.org/rpms/rust-async-std.git /var/lib/mock/f39-build-1564142-37498/root/chroot_tmpdir/scmroot/rust-async-std
Cloning into '/var/lib/mock/f39-build-1564142-37498/root/chroot_tmpdir/scmroot/rust-async-std'...
$ git fetch origin cdf12c0a542a44b5e02966ae4a6943f2c36d6ff2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-async-std
 * [new ref]         cdf12c0a542a44b5e02966ae4a6943f2c36d6ff2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cdf12c0 Regenerate with rust2rpm v24