$ git clone -n https://src.fedoraproject.org/rpms/SDL2_mixer.git /var/lib/mock/f42-build-side-1-3505949-45995/root/chroot_tmpdir/scmroot/SDL2_mixer
Cloning into '/var/lib/mock/f42-build-side-1-3505949-45995/root/chroot_tmpdir/scmroot/SDL2_mixer'...
$ git fetch origin 96166149fb76082837eddaad2811c45b96bfeb95:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/SDL2_mixer
 * [new ref]         96166149fb76082837eddaad2811c45b96bfeb95 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9616614 Add packit.yaml