$ git clone -n https://src.fedoraproject.org/rpms/nginx.git /var/lib/mock/f41-build-848000-164378/root/chroot_tmpdir/scmroot/nginx
Cloning into '/var/lib/mock/f41-build-848000-164378/root/chroot_tmpdir/scmroot/nginx'...
$ git fetch origin 0d029115826644f0fc68163fd8e47ff86548ef9e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nginx
 * [new ref]         0d029115826644f0fc68163fd8e47ff86548ef9e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0d02911 Update to 1.26.2