$ git clone -n https://src.fedoraproject.org/rpms/python-cramjam.git /var/lib/mock/f41-build-813086-148555/root/chroot_tmpdir/scmroot/python-cramjam
Cloning into '/var/lib/mock/f41-build-813086-148555/root/chroot_tmpdir/scmroot/python-cramjam'...
$ git fetch origin ff994571a49c213facd3205d09b3eb2317b8315e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-cramjam
 * [new ref]         ff994571a49c213facd3205d09b3eb2317b8315e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ff99457 Rebuilt with rust-lz4 1.25.0