$ git clone -n https://src.fedoraproject.org/rpms/golang-gocloud.git /var/lib/mock/f39-build-2132497-50802/root/chroot_tmpdir/scmroot/golang-gocloud
Cloning into '/var/lib/mock/f39-build-2132497-50802/root/chroot_tmpdir/scmroot/golang-gocloud'...
$ git fetch origin a1c2771ff400f124f0fa336862872b595a841b1b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-gocloud
 * [new ref]         a1c2771ff400f124f0fa336862872b595a841b1b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a1c2771 Use %autopatch -p1