$ git clone -n https://src.fedoraproject.org/rpms/transmission.git /var/lib/mock/f40-build-1443614-23577/root/chroot_tmpdir/scmroot/transmission
Cloning into '/var/lib/mock/f40-build-1443614-23577/root/chroot_tmpdir/scmroot/transmission'...
$ git fetch origin 005ab5bc0b91bbe3519f95b7e84be7bb01ef168b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/transmission
 * [new ref]         005ab5bc0b91bbe3519f95b7e84be7bb01ef168b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 005ab5b 4.0.6