$ git clone -n https://src.fedoraproject.org/rpms/golang-github-go-stack-stack.git /var/lib/mock/f38-build-side-42-init-devel-568958-25905/root/chroot_tmpdir/scmroot/golang-github-go-stack-stack
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-568958-25905/root/chroot_tmpdir/scmroot/golang-github-go-stack-stack'...
$ git fetch origin 9e69e96a6f37d908d986334c95951ec9e8066fce:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-go-stack-stack
 * [new ref]         9e69e96a6f37d908d986334c95951ec9e8066fce -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9e69e96 Initial setup of the repo