$ git clone -n https://src.fedoraproject.org/rpms/rubygem-idn.git /var/lib/mock/f45-build-34991-692/root/chroot_tmpdir/scmroot/rubygem-idn
Cloning into '/var/lib/mock/f45-build-34991-692/root/chroot_tmpdir/scmroot/rubygem-idn'...
$ git fetch origin e425664088dbd01332a2899b256551613d78fd1d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-idn
 * [new ref]         e425664088dbd01332a2899b256551613d78fd1d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e425664 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild