$ git clone -n https://src.fedoraproject.org/rpms/golang-github-ebitengine-purego.git /var/lib/mock/f39-build-1643166-40228/root/chroot_tmpdir/scmroot/golang-github-ebitengine-purego
Cloning into '/var/lib/mock/f39-build-1643166-40228/root/chroot_tmpdir/scmroot/golang-github-ebitengine-purego'...
$ git fetch origin 396378bfacf1a7defcfa8c834ead338c7a344c60:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-ebitengine-purego
 * [new ref]         396378bfacf1a7defcfa8c834ead338c7a344c60 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 396378b Exclude ppc64le and s390x