$ git clone -n https://src.fedoraproject.org/rpms/autoconf268.git /var/lib/mock/f39-build-1510704-35505/root/chroot_tmpdir/scmroot/autoconf268
Cloning into '/var/lib/mock/f39-build-1510704-35505/root/chroot_tmpdir/scmroot/autoconf268'...
$ git fetch origin 008337336754427d797ebd53d9013d0a436bd9a9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/autoconf268
 * [new ref]         008337336754427d797ebd53d9013d0a436bd9a9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0083373 Initial setup of the repo