$ git clone -n https://src.fedoraproject.org/rpms/free42.git /var/lib/mock/f41-build-873562-16167/root/chroot_tmpdir/scmroot/free42
Cloning into '/var/lib/mock/f41-build-873562-16167/root/chroot_tmpdir/scmroot/free42'...
$ git fetch origin c0dd800fffdf97d4d0975a0b0083ea102b292aca:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/free42
 * [new ref]         c0dd800fffdf97d4d0975a0b0083ea102b292aca -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c0dd800 Update to 3.1.8