$ git clone -n https://src.fedoraproject.org/rpms/rubygem-ruby_version.git /var/lib/mock/f45-build-35281-694/root/chroot_tmpdir/scmroot/rubygem-ruby_version
Cloning into '/var/lib/mock/f45-build-35281-694/root/chroot_tmpdir/scmroot/rubygem-ruby_version'...
$ git fetch origin 176ec09805e23efd74f5e2aa98f1ca2d02d9cdcf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-ruby_version
 * [new ref]         176ec09805e23efd74f5e2aa98f1ca2d02d9cdcf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 176ec09 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild