bind osbuild module from dynamically discovered path

Makefile

@@ -10,13 +10,13 @@ sdist:
 tarball:
 	git archive --prefix=osbuild-$(VERSION)/ --format=tar.gz HEAD > $(VERSION).tar.gz
 
-srpm: $(PACKAGE_NAME).spec tarball
+srpm: $(PACKAGE_NAME).spec check-working-directory tarball
 	/usr/bin/rpmbuild -bs \
 	  --define "_sourcedir $(CURDIR)" \
 	  --define "_srcrpmdir $(CURDIR)" \
 	  $(PACKAGE_NAME).spec
 
-rpm: $(PACKAGE_NAME).spec tarball
+rpm: $(PACKAGE_NAME).spec check-working-directory tarball 
 	- rm -r "`pwd`/output"
 	mkdir -p "`pwd`/output"
 	mkdir -p "`pwd`/rpmbuild"

osbuild/pipeline.py

@@ -1,10 +1,12 @@
 
 import contextlib
 import hashlib
+import importlib
 import json
 import os
 import subprocess
 import tempfile
+
 from . import buildroot
 from . import objectstore
 from . import remoteloop
@@ -125,14 +127,21 @@ class Assembler:
                 args["output_dir"] = "/run/osbuild/output"
 
             path = "/run/osbuild/lib"
+            osbuild_module_path = os.path.dirname(importlib.util.find_spec('osbuild').origin)
+            ro_binds = [f"{tree}:/run/osbuild/tree"]
+            if libdir:
+                ro_binds += [f"{libdir}:{path}"]
+            else:
+                # This is a temporary workaround, once we have a common way to include osbuild in the
+                # buildroot we should remove this because it includes code from the host in the buildroot thus
+                # violating our effort of reproducibility.
+                ro_binds += [f"/usr/lib/osbuild:{path}", f"{osbuild_module_path}:{path}/assemblers/osbuild"]
             with build_root.bound_socket("remoteloop") as sock, \
                 remoteloop.LoopServer(sock):
                 r = build_root.run(
                     [f"{path}/osbuild-run", f"{path}/assemblers/{self.name}"],
                     binds=binds,
-                    readonly_binds=[f"{tree}:/run/osbuild/tree"] +
+                    readonly_binds=ro_binds,
-                                   ([f"{libdir}:{path}"] if libdir else [f"/usr/lib/osbuild:{path}",
-                                   f"/usr/lib/python3.7/site-packages/osbuild:{path}/assemblers/osbuild"]),
                     encoding="utf-8",
                     input=json.dumps(args),
                     stdout=None if interactive else subprocess.PIPE,