$ git clone -n https://src.fedoraproject.org/rpms/rubygem-fog-core.git /var/lib/mock/f45-build-34895-692/root/chroot_tmpdir/scmroot/rubygem-fog-core
Cloning into '/var/lib/mock/f45-build-34895-692/root/chroot_tmpdir/scmroot/rubygem-fog-core'...
$ git fetch origin e0de361576a37738bb29f29947e07d098d5e7f24:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-fog-core
 * [new ref]         e0de361576a37738bb29f29947e07d098d5e7f24 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e0de361 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild