$ git clone -n https://src.fedoraproject.org/rpms/rubygem-nio4r.git /var/lib/mock/f40-build-2205227-51993/root/chroot_tmpdir/scmroot/rubygem-nio4r
Cloning into '/var/lib/mock/f40-build-2205227-51993/root/chroot_tmpdir/scmroot/rubygem-nio4r'...
$ git fetch origin c6971d89e84426e2d96d408f56825471e6c4310c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-nio4r
 * [new ref]         c6971d89e84426e2d96d408f56825471e6c4310c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c6971d8 Rebuilt for https://fedoraproject.org/wiki/Changes/Ruby_3.3