$ git clone -n https://src.fedoraproject.org/rpms/R-parallelly.git /var/lib/mock/f45-build-6284-347/root/chroot_tmpdir/scmroot/R-parallelly
Cloning into '/var/lib/mock/f45-build-6284-347/root/chroot_tmpdir/scmroot/R-parallelly'...
$ git fetch origin 4655d138ad6914f23bdc2699608c97488f7494c2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-parallelly
 * [new ref]         4655d138ad6914f23bdc2699608c97488f7494c2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4655d13 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild