$ git clone -n https://src.fedoraproject.org/rpms/qjackctl.git /var/lib/mock/f41-build-849850-164984/root/chroot_tmpdir/scmroot/qjackctl
Cloning into '/var/lib/mock/f41-build-849850-164984/root/chroot_tmpdir/scmroot/qjackctl'...
$ git fetch origin 2e5b6c29c691fedf6fea45d886e575883bf440e8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/qjackctl
 * [new ref]         2e5b6c29c691fedf6fea45d886e575883bf440e8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2e5b6c2 Update to version 1.0.1