$ git clone -n https://src.fedoraproject.org/rpms/crack-attack.git /var/lib/mock/f41-build-695818-12801/root/chroot_tmpdir/scmroot/crack-attack
Cloning into '/var/lib/mock/f41-build-695818-12801/root/chroot_tmpdir/scmroot/crack-attack'...
$ git fetch origin 8fdad71f194dcd6cba47dadb6980dbf946389295:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/crack-attack
 * [new ref]         8fdad71f194dcd6cba47dadb6980dbf946389295 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8fdad71 Eliminate use of obsolete %patchN syntax (#2283636)