$ git clone -n https://src.fedoraproject.org/rpms/plymouth-theme-breeze.git /var/lib/mock/f42-build-3426581-45197/root/chroot_tmpdir/scmroot/plymouth-theme-breeze
Cloning into '/var/lib/mock/f42-build-3426581-45197/root/chroot_tmpdir/scmroot/plymouth-theme-breeze'...
$ git fetch origin 3efae4693c2ca92b98550906870df4d0c3c15289:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plymouth-theme-breeze
 * [new ref]         3efae4693c2ca92b98550906870df4d0c3c15289 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3efae46 6.3.3