$ git clone -n https://src.fedoraproject.org/rpms/qjackctl.git /var/lib/mock/f42-build-side-1-3500295-45970/root/chroot_tmpdir/scmroot/qjackctl
Cloning into '/var/lib/mock/f42-build-side-1-3500295-45970/root/chroot_tmpdir/scmroot/qjackctl'...
$ git fetch origin 1e44d916ca29c61205cf06f891407aac6b8a612e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/qjackctl
 * [new ref]         1e44d916ca29c61205cf06f891407aac6b8a612e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1e44d91 Update to version 1.0.4