build-sys: add configure option to disable installation of Python module

Distributions often have their own guidelines regarding installation of Python
modules (e.g. Arch Linux mandates using --optimize=1 for setup.py install,
which the Makefile in this project does not do). Add an option
"--disable-python-installation" (disabled by default) to allow skipping the
Python installation process entirely so that distributions can take care of
this process manually in their preferred way.

Signed-off-by: Jonas Witschel <diabonas@archlinux.org>

configure.ac

@@ -380,6 +380,10 @@ AS_IF([ test $? = 0 ],
        [AC_MSG_RESULT([yes])],
        [AC_MSG_ERROR([python setuptools is required])])
 
+AC_ARG_ENABLE([python-installation],
+  AS_HELP_STRING([--disable-python-installation], [Disable running setup.py install for swtpm_setup]))
+AM_CONDITIONAL([PYTHON_INSTALLATION], [test "x$enable_python_installation" != "xno"])
+
 AC_ARG_ENABLE([hardening],
   AS_HELP_STRING([--disable-hardening], [Disable hardening flags]))
 

src/swtpm_setup/Makefile.am

@@ -19,6 +19,7 @@ $(PY_PACKAGE): $(PY_SWTPM_SETUP_FILES)
 
 all-local: $(PY_PACKAGE)
 
+if PYTHON_INSTALLATION
 install-exec-local: $(PY_PACKAGE)
 	@if ! test $(findstring /usr, "$(DESTDIR)$(bindir)"); then \
 		echo "Warning: Not installing python package to $(DESTDIR)$(bindir)"; \
@@ -35,6 +36,7 @@ uninstall-local:
 		echo "Local pip3 uninstall"; \
 		$(PIP3) uninstall -y $(PY_PACKAGE_NAME); \
 	fi
+endif
 
 # for out-of-tree builds we need to clean up
 clean-local: