$ git clone -n https://src.fedoraproject.org/rpms/rust-devicemapper-sys.git /var/lib/mock/f40-build-2100319-50456/root/chroot_tmpdir/scmroot/rust-devicemapper-sys
Cloning into '/var/lib/mock/f40-build-2100319-50456/root/chroot_tmpdir/scmroot/rust-devicemapper-sys'...
$ git fetch origin 0ea291d8a7bb4f52c6f8de32b30ac036be75eb3d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-devicemapper-sys
 * [new ref]         0ea291d8a7bb4f52c6f8de32b30ac036be75eb3d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0ea291d Update to version 0.2.0