$ git clone -n https://src.fedoraproject.org/rpms/breeze-gtk.git /var/lib/mock/f42-build-side-1-3584179-46892/root/chroot_tmpdir/scmroot/breeze-gtk
Cloning into '/var/lib/mock/f42-build-side-1-3584179-46892/root/chroot_tmpdir/scmroot/breeze-gtk'...
$ git fetch origin 522c7e490daf993e0e505749b3da1d164e470316:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/breeze-gtk
 * [new ref]         522c7e490daf993e0e505749b3da1d164e470316 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 522c7e4 6.4.2