$ git clone -n https://src.fedoraproject.org/rpms/tcl-thread.git /var/lib/mock/f29-build-4264-1022/root/thebuilddir/tmp/scmroot/tcl-thread
Cloning into '/var/lib/mock/f29-build-4264-1022/root/thebuilddir/tmp/scmroot/tcl-thread'...
$ git reset --hard 7c73065e17b656308159983ede159b93b602083f
HEAD is now at 7c73065 Update to 2.8.2 after unretire.