$ git clone -n https://src.fedoraproject.org/rpms/gnutls.git /var/lib/mock/f42-build-863178-171473/root/chroot_tmpdir/scmroot/gnutls
Cloning into '/var/lib/mock/f42-build-863178-171473/root/chroot_tmpdir/scmroot/gnutls'...
$ git fetch origin abb8fe2e0b307d5ea246fd6ab699f55693947fa1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnutls
 * [new ref]         abb8fe2e0b307d5ea246fd6ab699f55693947fa1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at abb8fe2 Update to 3.8.8 upstream release