$ git clone -n https://src.fedoraproject.org/rpms/rubygem-chef-utils.git /var/lib/mock/f45-build-34810-691/root/chroot_tmpdir/scmroot/rubygem-chef-utils
Cloning into '/var/lib/mock/f45-build-34810-691/root/chroot_tmpdir/scmroot/rubygem-chef-utils'...
$ git fetch origin ac8a792e957d381fcdebf117266d20b0f20fb748:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-chef-utils
 * [new ref]         ac8a792e957d381fcdebf117266d20b0f20fb748 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ac8a792 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild