$ git clone -n https://src.fedoraproject.org/rpms/rubygem-i18n.git /var/lib/mock/f45-build-34990-692/root/chroot_tmpdir/scmroot/rubygem-i18n
Cloning into '/var/lib/mock/f45-build-34990-692/root/chroot_tmpdir/scmroot/rubygem-i18n'...
$ git fetch origin 870407fa2f9c91e36a901a5c3329bdd9d9960424:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-i18n
 * [new ref]         870407fa2f9c91e36a901a5c3329bdd9d9960424 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 870407f Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild