$ git clone -n https://src.fedoraproject.org/rpms/golang-cloud-google-logging.git /var/lib/mock/f40-build-2238300-53563/root/chroot_tmpdir/scmroot/golang-cloud-google-logging
Cloning into '/var/lib/mock/f40-build-2238300-53563/root/chroot_tmpdir/scmroot/golang-cloud-google-logging'...
$ git fetch origin 939e585f466dc057a6df7e475bd4dbfac648aea8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-cloud-google-logging
 * [new ref]         939e585f466dc057a6df7e475bd4dbfac648aea8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 939e585 Disable bootstrap mode