$ git clone -n https://src.fedoraproject.org/rpms/golang-cloud-google-trace.git /var/lib/mock/f40-build-2214098-52348/root/chroot_tmpdir/scmroot/golang-cloud-google-trace
Cloning into '/var/lib/mock/f40-build-2214098-52348/root/chroot_tmpdir/scmroot/golang-cloud-google-trace'...
$ git fetch origin 19bd10e0ff7ec285719a37002451d9bf0c8c7a90:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-cloud-google-trace
 * [new ref]         19bd10e0ff7ec285719a37002451d9bf0c8c7a90 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 19bd10e Disable bootstrap mode