$ git clone -n https://src.fedoraproject.org/rpms/grub2-breeze-theme.git /var/lib/mock/f42-build-862509-170850/root/chroot_tmpdir/scmroot/grub2-breeze-theme
Cloning into '/var/lib/mock/f42-build-862509-170850/root/chroot_tmpdir/scmroot/grub2-breeze-theme'...
$ git fetch origin 64000f01da45352e48a3cf90d69938ef16d5608c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/grub2-breeze-theme
 * [new ref]         64000f01da45352e48a3cf90d69938ef16d5608c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 64000f0 6.2.4