$ git clone -n https://src.fedoraproject.org/rpms/sdrpp.git /var/lib/mock/f42-build-side-1-3510393-46030/root/chroot_tmpdir/scmroot/sdrpp
Cloning into '/var/lib/mock/f42-build-side-1-3510393-46030/root/chroot_tmpdir/scmroot/sdrpp'...
$ git fetch origin 76155ccde93985b3fb685dba696aed7fa7a745d8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/sdrpp
 * [new ref]         76155ccde93985b3fb685dba696aed7fa7a745d8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 76155cc Update to 1.2.1.