$ git clone -n https://src.fedoraproject.org/rpms/golang-modernc-tcl.git /var/lib/mock/f40-build-737439-107153/root/chroot_tmpdir/scmroot/golang-modernc-tcl
Cloning into '/var/lib/mock/f40-build-737439-107153/root/chroot_tmpdir/scmroot/golang-modernc-tcl'...
$ git fetch origin 6734ccf8cb2c4b375f99c9cd2c7f7b25268ab9ff:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-modernc-tcl
 * [new ref]         6734ccf8cb2c4b375f99c9cd2c7f7b25268ab9ff -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6734ccf Initial import (fedora#2231933)