$ git clone -n https://src.fedoraproject.org/rpms/ocean-sound-theme.git /var/lib/mock/f42-build-side-1-3499389-45964/root/chroot_tmpdir/scmroot/ocean-sound-theme
Cloning into '/var/lib/mock/f42-build-side-1-3499389-45964/root/chroot_tmpdir/scmroot/ocean-sound-theme'...
$ git fetch origin b2433adde1e1330d224fad8cbc7d70bd973fd5a2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocean-sound-theme
 * [new ref]         b2433adde1e1330d224fad8cbc7d70bd973fd5a2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b2433ad 6.3.4