$ git clone -n https://src.fedoraproject.org/rpms/golang-github-slimtoolkit-slim.git /var/lib/mock/f40-build-2709384-71611/root/chroot_tmpdir/scmroot/golang-github-slimtoolkit-slim
Cloning into '/var/lib/mock/f40-build-2709384-71611/root/chroot_tmpdir/scmroot/golang-github-slimtoolkit-slim'...
$ git fetch origin 60e8d710c46e633c7f321665dd4e956ca783ceb7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-slimtoolkit-slim
 * [new ref]         60e8d710c46e633c7f321665dd4e956ca783ceb7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 60e8d71 Added the README