$ git clone -n https://src.fedoraproject.org/rpms/rust-powierza-coefficient.git /var/lib/mock/f38-build-side-43-rust-devel-1411709-31436/root/chroot_tmpdir/scmroot/rust-powierza-coefficient
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1411709-31436/root/chroot_tmpdir/scmroot/rust-powierza-coefficient'...
$ git fetch origin 38dc41b8cbe203d741062aaf6e24614aef014daa:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-powierza-coefficient
 * [new ref]         38dc41b8cbe203d741062aaf6e24614aef014daa -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 38dc41b Initial Fedora package