$ git clone -n https://src.fedoraproject.org/rpms/grub2-breeze-theme.git /var/lib/mock/f40-build-2185365-51289/root/chroot_tmpdir/scmroot/grub2-breeze-theme
Cloning into '/var/lib/mock/f40-build-2185365-51289/root/chroot_tmpdir/scmroot/grub2-breeze-theme'...
$ git fetch origin 6ebdef4ae8d5bc9c716e8a66d88a55deb71c5fcf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/grub2-breeze-theme
 * [new ref]         6ebdef4ae8d5bc9c716e8a66d88a55deb71c5fcf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6ebdef4 5.91.0