FMUs don't export libopenblas.so

[Andreas Heuermann]

I'm building a static C FMU 2.0 for ModelExchange with OpenModelica and try to simulate it with FMPy in a clean testing environment without omc available.

Our OpenModelica FMUs can't be simulated with FMPy since they are missing openblas.so

How to reproduce
Note: You will need omc and docker in your path.

Run in your shell:

$ omc buildFMU.mos
true
""
"/home/.../ticket6010/BouncingBall.fmu"
""
$ docker run -it --rm -v $(pwd):/testDir anheuermann/fmpy:focal-arm64 /bin/bash
root@19cd9af7df5a:/# cd /testDir/
root@19cd9af7df5a:/testDir# ls *.fmu
BouncingBall.fmu
root@19cd9af7df5a:/testDir# python3
Python 3.8.2 (default, Apr 27 2020, 15:53:34)
[GCC 9.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from fmpy import *
>>> fmu='BouncingBall.fmu'
>>> result = simulate_fmu(fmu)
Traceback (most recent call last):
  File "/usr/local/lib/python3.8/dist-packages/fmpy/fmi1.py", line 142, in __init__
    self.dll = cdll.LoadLibrary(libraryPath)
  File "/usr/lib/python3.8/ctypes/__init__.py", line 451, in LoadLibrary
    return self._dlltype(name)
  File "/usr/lib/python3.8/ctypes/__init__.py", line 373, in __init__
    self._handle = _dlopen(self._name, mode)
OSError: libopenblas.so.0: cannot open shared object file: No such file or directory

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python3.8/dist-packages/fmpy/simulation.py", line 557, in simulate_fmu
    fmu = instantiate_fmu(unzipdir, model_description, fmi_type, visible, debug_logging, logger, fmi_call_logger, use_remoting)
  File "/usr/local/lib/python3.8/dist-packages/fmpy/simulation.py", line 646, in instantiate_fmu
    fmu = FMU2Model(**fmu_args)
  File "/usr/local/lib/python3.8/dist-packages/fmpy/fmi2.py", line 409, in __init__
    super(FMU2Model, self).__init__(**kwargs)
  File "/usr/local/lib/python3.8/dist-packages/fmpy/fmi2.py", line 85, in __init__
    super(_FMU2, self).__init__(**kwargs)
  File "/usr/local/lib/python3.8/dist-packages/fmpy/fmi1.py", line 144, in __init__
    raise Exception("Failed to load shared library %s. %s" % (libraryPath, e))
Exception: Failed to load shared library /tmp/tmprujxrrsu/binaries/linux64/BouncingBall.so. libopenblas.so.0: cannot open shared object file: No such file or directory
>>>

buildFMU.mos

loadString("
model BouncingBall
  parameter Real e=0.7 \"coefficient of restitution\";
  parameter Real g=9.81 \"gravity acceleration\";
  Real h(fixed=true, start=1) \"height of ball\";
  Real v(fixed=true) \"velocity of ball\";
  Boolean flying(fixed=true, start=true) \"true, if ball is flying\";
  Boolean impact;
  Real v_new(fixed=true);
  Integer foo;
equation
  impact = h <= 0.0;
  foo = if impact then 1 else 2;
  der(v) = if flying then -g else 0;
  der(h) = v;
  when {h <= 0.0 and v <= 0.0,impact} then
    v_new = if edge(impact) then -e*pre(v) else 0;
    flying = v_new > 0;
    reinit(v, v_new);
  end when;
end BouncingBall;");
getErrorString();

buildModelFMU(BouncingBall, version="2.0", fmuType="me", fileNamePrefix="BouncingBall", platforms={"static"});
getErrorString();