$ git clone -n https://src.fedoraproject.org/rpms/dev86.git /var/lib/mock/f45-build-7440-364/root/chroot_tmpdir/scmroot/dev86
Cloning into '/var/lib/mock/f45-build-7440-364/root/chroot_tmpdir/scmroot/dev86'...
$ git fetch origin 5448a018adddd974dbef77c6d22e8204a238b9c9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/dev86
 * [new ref]         5448a018adddd974dbef77c6d22e8204a238b9c9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5448a01 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild