$ git clone -n https://src.fedoraproject.org/rpms/gnome-logs.git /var/lib/mock/f40-build-2066676-49285/root/chroot_tmpdir/scmroot/gnome-logs
Cloning into '/var/lib/mock/f40-build-2066676-49285/root/chroot_tmpdir/scmroot/gnome-logs'...
$ git fetch origin 235c9b2e78b9cda2f8bfe685dc27cbe5a0532014:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnome-logs
 * [new ref]         235c9b2e78b9cda2f8bfe685dc27cbe5a0532014 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 235c9b2 Update to 45.beta