$ git clone -n https://src.fedoraproject.org/rpms/golang-github-letsencrypt-challtestsrv.git /var/lib/mock/f38-build-side-42-init-devel-667057-26652/root/chroot_tmpdir/scmroot/golang-github-letsencrypt-challtestsrv
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-667057-26652/root/chroot_tmpdir/scmroot/golang-github-letsencrypt-challtestsrv'...
$ git fetch origin 8216f0128735c78fceff2a50e05fa61882786aaa:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-letsencrypt-challtestsrv
 * [new ref]         8216f0128735c78fceff2a50e05fa61882786aaa -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8216f01 Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild