$ git clone -n https://src.fedoraproject.org/rpms/golang-github-google-trillian.git /var/lib/mock/f42-build-3494627-45873/root/chroot_tmpdir/scmroot/golang-github-google-trillian
Cloning into '/var/lib/mock/f42-build-3494627-45873/root/chroot_tmpdir/scmroot/golang-github-google-trillian'...
$ git fetch origin 7528ec0fc86843154206461af7f545030c1ee3eb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-google-trillian
 * [new ref]         7528ec0fc86843154206461af7f545030c1ee3eb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7528ec0 Add Packit support