$ git clone -n https://src.fedoraproject.org/rpms/crack.git /var/lib/mock/f41-build-884126-16592/root/chroot_tmpdir/scmroot/crack
Cloning into '/var/lib/mock/f41-build-884126-16592/root/chroot_tmpdir/scmroot/crack'...
$ git fetch origin 5e6886752dd92c6daf656d8f7d1c96ea90e36f39:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/crack
 * [new ref]         5e6886752dd92c6daf656d8f7d1c96ea90e36f39 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5e68867 Eliminate use of obsolete %patchN syntax (#2283636)