$ git clone -n https://src.fedoraproject.org/rpms/slock.git /var/lib/mock/f41-build-1041749-18988/root/chroot_tmpdir/scmroot/slock
Cloning into '/var/lib/mock/f41-build-1041749-18988/root/chroot_tmpdir/scmroot/slock'...
$ git fetch origin 9a9cab297328630735a576edf0934f32e9537962:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/slock
 * [new ref]         9a9cab297328630735a576edf0934f32e9537962 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9a9cab2 Eliminate use of obsolete %patchN syntax (#2283636)