$ git clone -n https://src.fedoraproject.org/rpms/nodejs-epel.git /var/lib/mock/f40-build-2705141-70988/root/chroot_tmpdir/scmroot/nodejs-epel
Cloning into '/var/lib/mock/f40-build-2705141-70988/root/chroot_tmpdir/scmroot/nodejs-epel'...
$ git fetch origin f9dbbb3bf9c1ad5053afe3b3f21184937a33f065:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nodejs-epel
 * [new ref]         f9dbbb3bf9c1ad5053afe3b3f21184937a33f065 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f9dbbb3 EPEL-only package