$ git clone -n https://src.fedoraproject.org/rpms/plasma-bigscreen.git /var/lib/mock/f40-build-2536680-61850/root/chroot_tmpdir/scmroot/plasma-bigscreen
Cloning into '/var/lib/mock/f40-build-2536680-61850/root/chroot_tmpdir/scmroot/plasma-bigscreen'...
$ git fetch origin 6cac78aacf237dba71008b6f1bbb9376ef7d6f6f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-bigscreen
 * [new ref]         6cac78aacf237dba71008b6f1bbb9376ef7d6f6f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6cac78a Cleaned up spec (Don't need to rebuild)