$ git clone -n https://src.fedoraproject.org/rpms/megapixels.git /var/lib/mock/f40-build-763217-122451/root/chroot_tmpdir/scmroot/megapixels
Cloning into '/var/lib/mock/f40-build-763217-122451/root/chroot_tmpdir/scmroot/megapixels'...
$ git fetch origin 67f5a994ee416625160561e3aa41563e99359855:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/megapixels
 * [new ref]         67f5a994ee416625160561e3aa41563e99359855 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 67f5a99 Update to 1.7.0