$ git clone -n https://src.fedoraproject.org/rpms/rubygem-gettext.git /var/lib/mock/f45-build-34932-692/root/chroot_tmpdir/scmroot/rubygem-gettext
Cloning into '/var/lib/mock/f45-build-34932-692/root/chroot_tmpdir/scmroot/rubygem-gettext'...
$ git fetch origin 3b02fa1dca07835bb2895aabd2093a0fc71c2409:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-gettext
 * [new ref]         3b02fa1dca07835bb2895aabd2093a0fc71c2409 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3b02fa1 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild