$ git clone -n https://src.fedoraproject.org/rpms/rubygem-ruby-shadow.git /var/lib/mock/f45-build-35233-694/root/chroot_tmpdir/scmroot/rubygem-ruby-shadow
Cloning into '/var/lib/mock/f45-build-35233-694/root/chroot_tmpdir/scmroot/rubygem-ruby-shadow'...
$ git fetch origin 8860e738650ec43e7ba1ef89a83acf13805a9fcd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-ruby-shadow
 * [new ref]         8860e738650ec43e7ba1ef89a83acf13805a9fcd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8860e73 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild