$ git clone -n https://src.fedoraproject.org/rpms/rust-libflate.git /var/lib/mock/f41-build-700692-12889/root/chroot_tmpdir/scmroot/rust-libflate
Cloning into '/var/lib/mock/f41-build-700692-12889/root/chroot_tmpdir/scmroot/rust-libflate'...
$ git fetch origin bcb96e08d6aaf0158a5dc5dd1472ebc6d2185784:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-libflate
 * [new ref]         bcb96e08d6aaf0158a5dc5dd1472ebc6d2185784 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bcb96e0 Update to 2.1.0; Fixes: RHBZ#2221370