$ git clone -n https://src.fedoraproject.org/rpms/lens-magic.git /var/lib/mock/f41-build-833559-157883/root/chroot_tmpdir/scmroot/lens-magic
Cloning into '/var/lib/mock/f41-build-833559-157883/root/chroot_tmpdir/scmroot/lens-magic'...
$ git fetch origin 69728a5e29b493025e1008a05fd2dbd46aca8d4f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/lens-magic
 * [new ref]         69728a5e29b493025e1008a05fd2dbd46aca8d4f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 69728a5 Initial import