$ git clone -n https://src.fedoraproject.org/rpms/golang-github-acme-lego.git /var/lib/mock/f41-build-842751-161701/root/chroot_tmpdir/scmroot/golang-github-acme-lego
Cloning into '/var/lib/mock/f41-build-842751-161701/root/chroot_tmpdir/scmroot/golang-github-acme-lego'...
$ git fetch origin 981368ed6fb25a520c2f60aa1e6fab05f655e3e4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-acme-lego
 * [new ref]         981368ed6fb25a520c2f60aa1e6fab05f655e3e4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 981368e Update to 4.17.4 - Closes rhbz#2009869 rhbz#2171504 rhbz#2268886 rhbz#2294003 rhbz#2225838