$ git clone -n https://src.fedoraproject.org/rpms/stb.git /var/lib/mock/f41-build-side-1-2816679-32973/root/chroot_tmpdir/scmroot/stb
Cloning into '/var/lib/mock/f41-build-side-1-2816679-32973/root/chroot_tmpdir/scmroot/stb'...
$ git fetch origin 3de92ac5a25aeb65a446b38552c38710968b1915:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/stb
 * [new ref]         3de92ac5a25aeb65a446b38552c38710968b1915 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3de92ac stb_image_resize2 2.11