$ git clone -n https://src.fedoraproject.org/rpms/qjackctl.git /var/lib/mock/f40-build-1793150-24860/root/chroot_tmpdir/scmroot/qjackctl
Cloning into '/var/lib/mock/f40-build-1793150-24860/root/chroot_tmpdir/scmroot/qjackctl'...
$ git fetch origin 0043fb842de2b3264622759957953963cc448fac:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/qjackctl
 * [new ref]         0043fb842de2b3264622759957953963cc448fac -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0043fb8 Update to version 1.0.0