$ git clone -n https://src.fedoraproject.org/rpms/rust-rancor.git /var/lib/mock/f41-build-side-1-3000341-36333/root/chroot_tmpdir/scmroot/rust-rancor
Cloning into '/var/lib/mock/f41-build-side-1-3000341-36333/root/chroot_tmpdir/scmroot/rust-rancor'...
$ git fetch origin f9398f9c1d219a0de85824eab21779cc41a98742:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rancor
 * [new ref]         f9398f9c1d219a0de85824eab21779cc41a98742 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f9398f9 Initial package (close RHBZ#2314085)