$ git clone -n https://src.fedoraproject.org/rpms/guile-gnutls.git /var/lib/mock/f40-build-796899-140981/root/chroot_tmpdir/scmroot/guile-gnutls
Cloning into '/var/lib/mock/f40-build-796899-140981/root/chroot_tmpdir/scmroot/guile-gnutls'...
$ git fetch origin 0c93be24f7238e5d07efe1b61ac15f598fe23b36:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/guile-gnutls
 * [new ref]         0c93be24f7238e5d07efe1b61ac15f598fe23b36 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0c93be2 Initial import (fedora#2172108).