$ git clone -n https://src.fedoraproject.org/rpms/golang-github-sacloud-libsacloud.git /var/lib/mock/f40-build-2246296-53808/root/chroot_tmpdir/scmroot/golang-github-sacloud-libsacloud
Cloning into '/var/lib/mock/f40-build-2246296-53808/root/chroot_tmpdir/scmroot/golang-github-sacloud-libsacloud'...
$ git fetch origin 0795662126edb63455e52623c0a059fa1c548665:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-sacloud-libsacloud
 * [new ref]         0795662126edb63455e52623c0a059fa1c548665 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0795662 Remove deprecated %patchN syntax