$ git clone -n https://src.fedoraproject.org/rpms/deepin-wallpapers.git /var/lib/mock/f41-build-side-1-2633978-25987/root/chroot_tmpdir/scmroot/deepin-wallpapers
Cloning into '/var/lib/mock/f41-build-side-1-2633978-25987/root/chroot_tmpdir/scmroot/deepin-wallpapers'...
$ git fetch origin e59f87abf3e4d291e1e8edd31e2584a437022458:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/deepin-wallpapers
 * [new ref]         e59f87abf3e4d291e1e8edd31e2584a437022458 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e59f87a fix build