$ git clone -n https://src.fedoraproject.org/rpms/rubygem-prawn-templates.git /var/lib/mock/f45-build-35205-694/root/chroot_tmpdir/scmroot/rubygem-prawn-templates
Cloning into '/var/lib/mock/f45-build-35205-694/root/chroot_tmpdir/scmroot/rubygem-prawn-templates'...
$ git fetch origin 3a22354606dea86e6f2dbf5037477182a1208dc3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-prawn-templates
 * [new ref]         3a22354606dea86e6f2dbf5037477182a1208dc3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3a22354 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild