$ git clone -n https://src.fedoraproject.org/rpms/nghttp2.git /var/lib/mock/f40-build-2201105-51805/root/chroot_tmpdir/scmroot/nghttp2
Cloning into '/var/lib/mock/f40-build-2201105-51805/root/chroot_tmpdir/scmroot/nghttp2'...
$ git fetch origin 1abd1877dedf0ddbb2532068401bdfc2bda4a4ec:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nghttp2
 * [new ref]         1abd1877dedf0ddbb2532068401bdfc2bda4a4ec -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1abd187 HPND-Kevlin-Henney is now allowed and recognised by Fedora