diff mbox series

[RFC] libselinux: Use Python distutils to install SELinux python bindings

Message ID 20190607153544.10046-1-plautrba@redhat.com (mailing list archive)
State Superseded
Headers show
Series [RFC] libselinux: Use Python distutils to install SELinux python bindings | expand

Commit Message

Petr Lautrbach June 7, 2019, 3:35 p.m. UTC
Follow officially documented way how to build C extension modules using
distutils - https://docs.python.org/3.8/extending/building.html#building

Fixes:

- https://bugzilla.redhat.com/show_bug.cgi?id=1715589 - selinux python module
fails to load when it's built using SWIG-4.0:

>>> import selinux
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib64/python3.7/site-packages/selinux/__init__.py", line 13, in <module>
    from . import _selinux
ImportError: cannot import name '_selinux' from 'selinux' (/usr/lib64/python3.7/site-packages/selinux/__init__.py)
>>>

SWIG-4.0 changed (again?) its behavior so that it uses: from . import _selinux
which looks for _selinux module in the same directory as where __init__.py is -
$(PYLIBDIR)/site-packages/selinux. But _selinux module is installed into
$(PYLIBDIR)/site-packages/ since a9604c30a5e2f ("libselinux: Change the location
of _selinux.so").

On the other hand, the module can't be loaded when it's built using older SWIG.
I'd use a symlink from $(PYLIBDIR)/site-packages/selinux to
$(PYLIBDIR)/site-packages/ in order to fix that

- https://bugzilla.redhat.com/show_bug.cgi?id=1715756 - audit2why python module
fails to build with Python 3.8

- https://bugzilla.redhat.com/show_bug.cgi?id=1709576 - selinux python module
doesn't provide any Python metadata

Signed-off-by: Petr Lautrbach <plautrba@redhat.com>
---
 libselinux/src/.gitignore |  2 +-
 libselinux/src/Makefile   | 37 ++++++++-----------------------------
 libselinux/src/setup.py   | 24 ++++++++++++++++++++++++
 3 files changed, 33 insertions(+), 30 deletions(-)
 create mode 100644 libselinux/src/setup.py

Comments

Nicolas Iooss June 30, 2019, 11:54 a.m. UTC | #1
Hi,

Thanks for your patch. Some comments below.

On Fri, Jun 7, 2019 at 5:35 PM Petr Lautrbach <plautrba@redhat.com> wrote:
>
> Follow officially documented way how to build C extension modules using
> distutils - https://docs.python.org/3.8/extending/building.html#building
>
> Fixes:
>
> - https://bugzilla.redhat.com/show_bug.cgi?id=1715589 - selinux python module
> fails to load when it's built using SWIG-4.0:
>
> >>> import selinux
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
>   File "/usr/lib64/python3.7/site-packages/selinux/__init__.py", line 13, in <module>
>     from . import _selinux
> ImportError: cannot import name '_selinux' from 'selinux' (/usr/lib64/python3.7/site-packages/selinux/__init__.py)
> >>>
>
> SWIG-4.0 changed (again?) its behavior so that it uses: from . import _selinux
> which looks for _selinux module in the same directory as where __init__.py is -
> $(PYLIBDIR)/site-packages/selinux. But _selinux module is installed into
> $(PYLIBDIR)/site-packages/ since a9604c30a5e2f ("libselinux: Change the location
> of _selinux.so").
>
> On the other hand, the module can't be loaded when it's built using older SWIG.
> I'd use a symlink from $(PYLIBDIR)/site-packages/selinux to
> $(PYLIBDIR)/site-packages/ in order to fix that

I agree. For information, Debian sid still uses SWIG 3.0 (cf.
https://packages.debian.org/sid/swig), and this patch indeed breaks
things there ("make install-pywrap" succeeds but "import selinux" in
python fails to find module _selinux). Adding the symlink for _selinux
native module can be done with:

--- a/libselinux/src/Makefile
+++ b/libselinux/src/Makefile
@@ -175,6 +175,7 @@ install: all
 install-pywrap: pywrap
        $(PYTHON) setup.py install --prefix=$(PREFIX) `test -n
"$(DESTDIR)" && echo --root $(DESTDIR)`
        install -m 644 selinux.py $(DESTDIR)$(PYTHONLIBDIR)/selinux/__init__.py
+       ln -sf selinux/_selinux$(PYCEXT)
$(DESTDIR)$(PYTHONLIBDIR)/_selinux$(PYCEXT)

 install-rubywrap: rubywrap
        test -d $(DESTDIR)$(RUBYINSTALL) || install -m 755 -d
$(DESTDIR)$(RUBYINSTALL)

>
> - https://bugzilla.redhat.com/show_bug.cgi?id=1715756 - audit2why python module
> fails to build with Python 3.8
>
> - https://bugzilla.redhat.com/show_bug.cgi?id=1709576 - selinux python module
> doesn't provide any Python metadata
>
> Signed-off-by: Petr Lautrbach <plautrba@redhat.com>
> ---
>  libselinux/src/.gitignore |  2 +-
>  libselinux/src/Makefile   | 37 ++++++++-----------------------------
>  libselinux/src/setup.py   | 24 ++++++++++++++++++++++++
>  3 files changed, 33 insertions(+), 30 deletions(-)
>  create mode 100644 libselinux/src/setup.py
>
> diff --git a/libselinux/src/.gitignore b/libselinux/src/.gitignore
> index 4dcc3b3b..428afe5a 100644
> --- a/libselinux/src/.gitignore
> +++ b/libselinux/src/.gitignore
> @@ -1,4 +1,4 @@
>  selinux.py
> -selinuxswig_wrap.c
> +selinuxswig_python_wrap.c
>  selinuxswig_python_exception.i
>  selinuxswig_ruby_wrap.c
> diff --git a/libselinux/src/Makefile b/libselinux/src/Makefile
> index e9ed0383..826c830c 100644
> --- a/libselinux/src/Makefile
> +++ b/libselinux/src/Makefile
> @@ -36,7 +36,7 @@ TARGET=libselinux.so
>  LIBPC=libselinux.pc
>  SWIGIF= selinuxswig_python.i selinuxswig_python_exception.i
>  SWIGRUBYIF= selinuxswig_ruby.i
> -SWIGCOUT= selinuxswig_wrap.c
> +SWIGCOUT= selinuxswig_python_wrap.c
>  SWIGPYOUT= selinux.py
>  SWIGRUBYCOUT= selinuxswig_ruby_wrap.c
>  SWIGLOBJ:= $(patsubst %.c,$(PYPREFIX)%.lo,$(SWIGCOUT))
> @@ -55,7 +55,7 @@ ifeq ($(LIBSEPOLA),)
>          LDLIBS_LIBSEPOLA := -l:libsepol.a
>  endif
>
> -GENERATED=$(SWIGCOUT) $(SWIGRUBYCOUT) selinuxswig_python_exception.i
> +GENERATED=$(SWIGCOUT) $(SWIGRUBYCOUT) $(SWIGCOUT) selinuxswig_python_exception.i
>  SRCS= $(filter-out $(GENERATED) audit2why.c, $(sort $(wildcard *.c)))
>
>  MAX_STACK_SIZE=32768
> @@ -125,25 +125,18 @@ DISABLE_FLAGS+= -DNO_ANDROID_BACKEND
>  SRCS:= $(filter-out label_backends_android.c, $(SRCS))
>  endif
>
> -SWIG = swig -Wall -python -o $(SWIGCOUT) -outdir ./ $(DISABLE_FLAGS)
> -
>  SWIGRUBY = swig -Wall -ruby -o $(SWIGRUBYCOUT) -outdir ./ $(DISABLE_FLAGS)
>
>  all: $(LIBA) $(LIBSO) $(LIBPC)
>
> -pywrap: all $(SWIGFILES) $(AUDIT2WHYSO)
> +pywrap: all selinuxswig_python_exception.i
> +       CFLAGS="$(SWIG_CFLAGS)" $(PYTHON) setup.py build_ext -I $(DESTDIR)$(INCLUDEDIR) -L $(DESTDIR)$(LIBDIR)
>
>  rubywrap: all $(SWIGRUBYSO)
>
> -$(SWIGLOBJ): $(SWIGCOUT)
> -       $(CC) $(CFLAGS) $(SWIG_CFLAGS) $(PYINC) -fPIC -DSHARED -c -o $@ $<
> -
>  $(SWIGRUBYLOBJ): $(SWIGRUBYCOUT)
>         $(CC) $(CFLAGS) $(SWIG_CFLAGS) $(RUBYINC) -fPIC -DSHARED -c -o $@ $<
>
> -$(SWIGSO): $(SWIGLOBJ)
> -       $(CC) $(CFLAGS) $(LDFLAGS) -L. -shared -o $@ $< -lselinux $(PYLIBS)
> -
>  $(SWIGRUBYSO): $(SWIGRUBYLOBJ)
>         $(CC) $(CFLAGS) $(LDFLAGS) -L. -shared -o $@ $^ -lselinux $(RUBYLIBS)
>
> @@ -161,29 +154,15 @@ $(LIBPC): $(LIBPC).in ../VERSION
>  selinuxswig_python_exception.i: ../include/selinux/selinux.h
>         bash -e exception.sh > $@ || (rm -f $@ ; false)
>
> -$(AUDIT2WHYLOBJ): audit2why.c
> -       $(CC) $(filter-out -Werror, $(CFLAGS)) $(PYINC) -fPIC -DSHARED -c -o $@ $<
> -
> -$(AUDIT2WHYSO): $(AUDIT2WHYLOBJ) $(LIBSEPOLA)
> -       $(CC) $(CFLAGS) $(LDFLAGS) -L. -shared -o $@ $^ -lselinux $(LDLIBS_LIBSEPOLA) $(PYLIBS) -Wl,-soname,audit2why.so,--version-script=audit2why.map,-z,defs
> -
>  %.o:  %.c policy.h
>         $(CC) $(CFLAGS) $(TLSFLAGS) -c -o $@ $<
>
>  %.lo:  %.c policy.h
>         $(CC) $(CFLAGS) -fPIC -DSHARED -c -o $@ $<
>
> -$(SWIGCOUT): $(SWIGIF)
> -       $(SWIG) $<
> -
> -$(SWIGPYOUT): $(SWIGCOUT)
> -
>  $(SWIGRUBYCOUT): $(SWIGRUBYIF)
>         $(SWIGRUBY) $<
>
> -swigify: $(SWIGIF)
> -       $(SWIG) $<
> -
>  install: all
>         test -d $(DESTDIR)$(LIBDIR) || install -m 755 -d $(DESTDIR)$(LIBDIR)
>         install -m 644 $(LIBA) $(DESTDIR)$(LIBDIR)
> @@ -194,10 +173,8 @@ install: all
>         ln -sf --relative $(DESTDIR)$(SHLIBDIR)/$(LIBSO) $(DESTDIR)$(LIBDIR)/$(TARGET)
>
>  install-pywrap: pywrap
> -       test -d $(DESTDIR)$(PYTHONLIBDIR)/selinux || install -m 755 -d $(DESTDIR)$(PYTHONLIBDIR)/selinux
> -       install -m 755 $(SWIGSO) $(DESTDIR)$(PYTHONLIBDIR)/_selinux$(PYCEXT)
> -       install -m 755 $(AUDIT2WHYSO) $(DESTDIR)$(PYTHONLIBDIR)/selinux/audit2why$(PYCEXT)
> -       install -m 644 $(SWIGPYOUT) $(DESTDIR)$(PYTHONLIBDIR)/selinux/__init__.py
> +       $(PYTHON) setup.py install --prefix=$(PREFIX) `test -n "$(DESTDIR)" && echo --root $(DESTDIR)`
> +       install -m 644 selinux.py $(DESTDIR)$(PYTHONLIBDIR)/selinux/__init__.py
>
>  install-rubywrap: rubywrap
>         test -d $(DESTDIR)$(RUBYINSTALL) || install -m 755 -d $(DESTDIR)$(RUBYINSTALL)
> @@ -208,6 +185,8 @@ relabel:
>
>  clean-pywrap:
>         -rm -f $(SWIGLOBJ) $(SWIGSO) $(AUDIT2WHYLOBJ) $(AUDIT2WHYSO)
> +       $(PYTHON) setup.py clean
> +       -rm -rf build *~ \#* *pyc .#*
>
>  clean-rubywrap:
>         -rm -f $(SWIGRUBYLOBJ) $(SWIGRUBYSO)
> diff --git a/libselinux/src/setup.py b/libselinux/src/setup.py
> new file mode 100644
> index 00000000..b12e7869
> --- /dev/null
> +++ b/libselinux/src/setup.py
> @@ -0,0 +1,24 @@
> +#!/usr/bin/python3
> +
> +from distutils.core import Extension, setup
> +
> +setup(
> +    name="selinux",
> +    version="2.9",
> +    description="SELinux python 3 bindings",
> +    author="SELinux Project",
> +    author_email="selinux@vger.kernel.org",
> +    ext_modules=[
> +        Extension('selinux._selinux',
> +                  sources=['selinuxswig_python.i'],
> +                  include_dirs=['../include'],
> +                  library_dirs=['.'],
> +                  libraries=['selinux']),
> +        Extension('selinux.audit2why',
> +                  sources=['audit2why.c'],
> +                  include_dirs=['../include'],
> +                  library_dirs=['.'],
> +                  libraries=['selinux'],
> +                  extra_link_args=['-l:libsepol.a'])
> +    ],
> +)
> --
> 2.22.0.rc3

When building audit2why extension, the version script "audit2why.map"
is no longer used. This might cause libsepol's symbols to "leak" to
the global symbol namespace used by the linker when audit2why
extension gets loaded (I have not tested if this really happens and I
may have missed some details).
Could you use extra_link_args=['-l:libsepol.a',
'-Wl,--version-script=audit2why.map'] and test if this works?

With the symlink and the version script, I managed to build the
extension on Arch Linux and Debian 9 and performed some minimal tests.

Thanks,
Nicolas
Petr Lautrbach July 16, 2019, 3:55 p.m. UTC | #2
Nicolas Iooss <nicolas.iooss@m4x.org> writes:

> Hi,
>
> Thanks for your patch. Some comments below.
>
> On Fri, Jun 7, 2019 at 5:35 PM Petr Lautrbach <plautrba@redhat.com> wrote:
>>
>> Follow officially documented way how to build C extension modules using
>> distutils - https://docs.python.org/3.8/extending/building.html#building
>>
>> Fixes:
>>
>> - https://bugzilla.redhat.com/show_bug.cgi?id=1715589 - selinux python module
>> fails to load when it's built using SWIG-4.0:
>>
>> >>> import selinux
>> Traceback (most recent call last):
>>   File "<stdin>", line 1, in <module>
>>   File "/usr/lib64/python3.7/site-packages/selinux/__init__.py", line 13, in <module>
>>     from . import _selinux
>> ImportError: cannot import name '_selinux' from 'selinux' (/usr/lib64/python3.7/site-packages/selinux/__init__.py)
>> >>>
>>
>> SWIG-4.0 changed (again?) its behavior so that it uses: from . import _selinux
>> which looks for _selinux module in the same directory as where __init__.py is -
>> $(PYLIBDIR)/site-packages/selinux. But _selinux module is installed into
>> $(PYLIBDIR)/site-packages/ since a9604c30a5e2f ("libselinux: Change the location
>> of _selinux.so").
>>
>> On the other hand, the module can't be loaded when it's built using older SWIG.
>> I'd use a symlink from $(PYLIBDIR)/site-packages/selinux to
>> $(PYLIBDIR)/site-packages/ in order to fix that
>
> I agree. For information, Debian sid still uses SWIG 3.0 (cf.
> https://packages.debian.org/sid/swig), and this patch indeed breaks
> things there ("make install-pywrap" succeeds but "import selinux" in
> python fails to find module _selinux). Adding the symlink for _selinux
> native module can be done with:
>
> --- a/libselinux/src/Makefile
> +++ b/libselinux/src/Makefile
> @@ -175,6 +175,7 @@ install: all
>  install-pywrap: pywrap
>         $(PYTHON) setup.py install --prefix=$(PREFIX) `test -n
> "$(DESTDIR)" && echo --root $(DESTDIR)`
>         install -m 644 selinux.py $(DESTDIR)$(PYTHONLIBDIR)/selinux/__init__.py
> +       ln -sf selinux/_selinux$(PYCEXT)
> $(DESTDIR)$(PYTHONLIBDIR)/_selinux$(PYCEXT)
>
>  install-rubywrap: rubywrap
>         test -d $(DESTDIR)$(RUBYINSTALL) || install -m 755 -d
> $(DESTDIR)$(RUBYINSTALL)
>
>>
>> - https://bugzilla.redhat.com/show_bug.cgi?id=1715756 - audit2why python module
>> fails to build with Python 3.8
>>
>> - https://bugzilla.redhat.com/show_bug.cgi?id=1709576 - selinux python module
>> doesn't provide any Python metadata
>>
>> Signed-off-by: Petr Lautrbach <plautrba@redhat.com>
>> ---
>>  libselinux/src/.gitignore |  2 +-
>>  libselinux/src/Makefile   | 37 ++++++++-----------------------------
>>  libselinux/src/setup.py   | 24 ++++++++++++++++++++++++
>>  3 files changed, 33 insertions(+), 30 deletions(-)
>>  create mode 100644 libselinux/src/setup.py
>>
>> diff --git a/libselinux/src/.gitignore b/libselinux/src/.gitignore
>> index 4dcc3b3b..428afe5a 100644
>> --- a/libselinux/src/.gitignore
>> +++ b/libselinux/src/.gitignore
>> @@ -1,4 +1,4 @@
>>  selinux.py
>> -selinuxswig_wrap.c
>> +selinuxswig_python_wrap.c
>>  selinuxswig_python_exception.i
>>  selinuxswig_ruby_wrap.c
>> diff --git a/libselinux/src/Makefile b/libselinux/src/Makefile
>> index e9ed0383..826c830c 100644
>> --- a/libselinux/src/Makefile
>> +++ b/libselinux/src/Makefile
>> @@ -36,7 +36,7 @@ TARGET=libselinux.so
>>  LIBPC=libselinux.pc
>>  SWIGIF= selinuxswig_python.i selinuxswig_python_exception.i
>>  SWIGRUBYIF= selinuxswig_ruby.i
>> -SWIGCOUT= selinuxswig_wrap.c
>> +SWIGCOUT= selinuxswig_python_wrap.c
>>  SWIGPYOUT= selinux.py
>>  SWIGRUBYCOUT= selinuxswig_ruby_wrap.c
>>  SWIGLOBJ:= $(patsubst %.c,$(PYPREFIX)%.lo,$(SWIGCOUT))
>> @@ -55,7 +55,7 @@ ifeq ($(LIBSEPOLA),)
>>          LDLIBS_LIBSEPOLA := -l:libsepol.a
>>  endif
>>
>> -GENERATED=$(SWIGCOUT) $(SWIGRUBYCOUT) selinuxswig_python_exception.i
>> +GENERATED=$(SWIGCOUT) $(SWIGRUBYCOUT) $(SWIGCOUT) selinuxswig_python_exception.i
>>  SRCS= $(filter-out $(GENERATED) audit2why.c, $(sort $(wildcard *.c)))
>>
>>  MAX_STACK_SIZE=32768
>> @@ -125,25 +125,18 @@ DISABLE_FLAGS+= -DNO_ANDROID_BACKEND
>>  SRCS:= $(filter-out label_backends_android.c, $(SRCS))
>>  endif
>>
>> -SWIG = swig -Wall -python -o $(SWIGCOUT) -outdir ./ $(DISABLE_FLAGS)
>> -
>>  SWIGRUBY = swig -Wall -ruby -o $(SWIGRUBYCOUT) -outdir ./ $(DISABLE_FLAGS)
>>
>>  all: $(LIBA) $(LIBSO) $(LIBPC)
>>
>> -pywrap: all $(SWIGFILES) $(AUDIT2WHYSO)
>> +pywrap: all selinuxswig_python_exception.i
>> +       CFLAGS="$(SWIG_CFLAGS)" $(PYTHON) setup.py build_ext -I $(DESTDIR)$(INCLUDEDIR) -L $(DESTDIR)$(LIBDIR)
>>
>>  rubywrap: all $(SWIGRUBYSO)
>>
>> -$(SWIGLOBJ): $(SWIGCOUT)
>> -       $(CC) $(CFLAGS) $(SWIG_CFLAGS) $(PYINC) -fPIC -DSHARED -c -o $@ $<
>> -
>>  $(SWIGRUBYLOBJ): $(SWIGRUBYCOUT)
>>         $(CC) $(CFLAGS) $(SWIG_CFLAGS) $(RUBYINC) -fPIC -DSHARED -c -o $@ $<
>>
>> -$(SWIGSO): $(SWIGLOBJ)
>> -       $(CC) $(CFLAGS) $(LDFLAGS) -L. -shared -o $@ $< -lselinux $(PYLIBS)
>> -
>>  $(SWIGRUBYSO): $(SWIGRUBYLOBJ)
>>         $(CC) $(CFLAGS) $(LDFLAGS) -L. -shared -o $@ $^ -lselinux $(RUBYLIBS)
>>
>> @@ -161,29 +154,15 @@ $(LIBPC): $(LIBPC).in ../VERSION
>>  selinuxswig_python_exception.i: ../include/selinux/selinux.h
>>         bash -e exception.sh > $@ || (rm -f $@ ; false)
>>
>> -$(AUDIT2WHYLOBJ): audit2why.c
>> -       $(CC) $(filter-out -Werror, $(CFLAGS)) $(PYINC) -fPIC -DSHARED -c -o $@ $<
>> -
>> -$(AUDIT2WHYSO): $(AUDIT2WHYLOBJ) $(LIBSEPOLA)
>> -       $(CC) $(CFLAGS) $(LDFLAGS) -L. -shared -o $@ $^ -lselinux $(LDLIBS_LIBSEPOLA) $(PYLIBS) -Wl,-soname,audit2why.so,--version-script=audit2why.map,-z,defs
>> -
>>  %.o:  %.c policy.h
>>         $(CC) $(CFLAGS) $(TLSFLAGS) -c -o $@ $<
>>
>>  %.lo:  %.c policy.h
>>         $(CC) $(CFLAGS) -fPIC -DSHARED -c -o $@ $<
>>
>> -$(SWIGCOUT): $(SWIGIF)
>> -       $(SWIG) $<
>> -
>> -$(SWIGPYOUT): $(SWIGCOUT)
>> -
>>  $(SWIGRUBYCOUT): $(SWIGRUBYIF)
>>         $(SWIGRUBY) $<
>>
>> -swigify: $(SWIGIF)
>> -       $(SWIG) $<
>> -
>>  install: all
>>         test -d $(DESTDIR)$(LIBDIR) || install -m 755 -d $(DESTDIR)$(LIBDIR)
>>         install -m 644 $(LIBA) $(DESTDIR)$(LIBDIR)
>> @@ -194,10 +173,8 @@ install: all
>>         ln -sf --relative $(DESTDIR)$(SHLIBDIR)/$(LIBSO) $(DESTDIR)$(LIBDIR)/$(TARGET)
>>
>>  install-pywrap: pywrap
>> -       test -d $(DESTDIR)$(PYTHONLIBDIR)/selinux || install -m 755 -d $(DESTDIR)$(PYTHONLIBDIR)/selinux
>> -       install -m 755 $(SWIGSO) $(DESTDIR)$(PYTHONLIBDIR)/_selinux$(PYCEXT)
>> -       install -m 755 $(AUDIT2WHYSO) $(DESTDIR)$(PYTHONLIBDIR)/selinux/audit2why$(PYCEXT)
>> -       install -m 644 $(SWIGPYOUT) $(DESTDIR)$(PYTHONLIBDIR)/selinux/__init__.py
>> +       $(PYTHON) setup.py install --prefix=$(PREFIX) `test -n "$(DESTDIR)" && echo --root $(DESTDIR)`
>> +       install -m 644 selinux.py $(DESTDIR)$(PYTHONLIBDIR)/selinux/__init__.py
>>
>>  install-rubywrap: rubywrap
>>         test -d $(DESTDIR)$(RUBYINSTALL) || install -m 755 -d $(DESTDIR)$(RUBYINSTALL)
>> @@ -208,6 +185,8 @@ relabel:
>>
>>  clean-pywrap:
>>         -rm -f $(SWIGLOBJ) $(SWIGSO) $(AUDIT2WHYLOBJ) $(AUDIT2WHYSO)
>> +       $(PYTHON) setup.py clean
>> +       -rm -rf build *~ \#* *pyc .#*
>>
>>  clean-rubywrap:
>>         -rm -f $(SWIGRUBYLOBJ) $(SWIGRUBYSO)
>> diff --git a/libselinux/src/setup.py b/libselinux/src/setup.py
>> new file mode 100644
>> index 00000000..b12e7869
>> --- /dev/null
>> +++ b/libselinux/src/setup.py
>> @@ -0,0 +1,24 @@
>> +#!/usr/bin/python3
>> +
>> +from distutils.core import Extension, setup
>> +
>> +setup(
>> +    name="selinux",
>> +    version="2.9",
>> +    description="SELinux python 3 bindings",
>> +    author="SELinux Project",
>> +    author_email="selinux@vger.kernel.org",
>> +    ext_modules=[
>> +        Extension('selinux._selinux',
>> +                  sources=['selinuxswig_python.i'],
>> +                  include_dirs=['../include'],
>> +                  library_dirs=['.'],
>> +                  libraries=['selinux']),
>> +        Extension('selinux.audit2why',
>> +                  sources=['audit2why.c'],
>> +                  include_dirs=['../include'],
>> +                  library_dirs=['.'],
>> +                  libraries=['selinux'],
>> +                  extra_link_args=['-l:libsepol.a'])
>> +    ],
>> +)
>> --
>> 2.22.0.rc3
>
> When building audit2why extension, the version script "audit2why.map"
> is no longer used. This might cause libsepol's symbols to "leak" to
> the global symbol namespace used by the linker when audit2why
> extension gets loaded (I have not tested if this really happens and I
> may have missed some details).
> Could you use extra_link_args=['-l:libsepol.a',
> '-Wl,--version-script=audit2why.map'] and test if this works?
>
> With the symlink and the version script, I managed to build the
> extension on Arch Linux and Debian 9 and performed some minimal tests.
>

Thanks for comments.

I've applied all your suggestions and add some more. Everything is in my
devel branch on github now -
https://github.com/bachradsusi/SELinuxProject-selinux/commits/swig-use-python-distutils

I'm waiting for Travis tests, then I'll run another tests directly on
Fedora packages and when everything passes I'll resend this as a regular
patch(es).

Petr
diff mbox series

Patch

diff --git a/libselinux/src/.gitignore b/libselinux/src/.gitignore
index 4dcc3b3b..428afe5a 100644
--- a/libselinux/src/.gitignore
+++ b/libselinux/src/.gitignore
@@ -1,4 +1,4 @@ 
 selinux.py
-selinuxswig_wrap.c
+selinuxswig_python_wrap.c
 selinuxswig_python_exception.i
 selinuxswig_ruby_wrap.c
diff --git a/libselinux/src/Makefile b/libselinux/src/Makefile
index e9ed0383..826c830c 100644
--- a/libselinux/src/Makefile
+++ b/libselinux/src/Makefile
@@ -36,7 +36,7 @@  TARGET=libselinux.so
 LIBPC=libselinux.pc
 SWIGIF= selinuxswig_python.i selinuxswig_python_exception.i
 SWIGRUBYIF= selinuxswig_ruby.i
-SWIGCOUT= selinuxswig_wrap.c
+SWIGCOUT= selinuxswig_python_wrap.c
 SWIGPYOUT= selinux.py
 SWIGRUBYCOUT= selinuxswig_ruby_wrap.c
 SWIGLOBJ:= $(patsubst %.c,$(PYPREFIX)%.lo,$(SWIGCOUT))
@@ -55,7 +55,7 @@  ifeq ($(LIBSEPOLA),)
         LDLIBS_LIBSEPOLA := -l:libsepol.a
 endif
 
-GENERATED=$(SWIGCOUT) $(SWIGRUBYCOUT) selinuxswig_python_exception.i
+GENERATED=$(SWIGCOUT) $(SWIGRUBYCOUT) $(SWIGCOUT) selinuxswig_python_exception.i
 SRCS= $(filter-out $(GENERATED) audit2why.c, $(sort $(wildcard *.c)))
 
 MAX_STACK_SIZE=32768
@@ -125,25 +125,18 @@  DISABLE_FLAGS+= -DNO_ANDROID_BACKEND
 SRCS:= $(filter-out label_backends_android.c, $(SRCS))
 endif
 
-SWIG = swig -Wall -python -o $(SWIGCOUT) -outdir ./ $(DISABLE_FLAGS)
-
 SWIGRUBY = swig -Wall -ruby -o $(SWIGRUBYCOUT) -outdir ./ $(DISABLE_FLAGS)
 
 all: $(LIBA) $(LIBSO) $(LIBPC)
 
-pywrap: all $(SWIGFILES) $(AUDIT2WHYSO)
+pywrap: all selinuxswig_python_exception.i
+	CFLAGS="$(SWIG_CFLAGS)" $(PYTHON) setup.py build_ext -I $(DESTDIR)$(INCLUDEDIR) -L $(DESTDIR)$(LIBDIR)
 
 rubywrap: all $(SWIGRUBYSO)
 
-$(SWIGLOBJ): $(SWIGCOUT)
-	$(CC) $(CFLAGS) $(SWIG_CFLAGS) $(PYINC) -fPIC -DSHARED -c -o $@ $<
-
 $(SWIGRUBYLOBJ): $(SWIGRUBYCOUT)
 	$(CC) $(CFLAGS) $(SWIG_CFLAGS) $(RUBYINC) -fPIC -DSHARED -c -o $@ $<
 
-$(SWIGSO): $(SWIGLOBJ)
-	$(CC) $(CFLAGS) $(LDFLAGS) -L. -shared -o $@ $< -lselinux $(PYLIBS)
-
 $(SWIGRUBYSO): $(SWIGRUBYLOBJ)
 	$(CC) $(CFLAGS) $(LDFLAGS) -L. -shared -o $@ $^ -lselinux $(RUBYLIBS)
 
@@ -161,29 +154,15 @@  $(LIBPC): $(LIBPC).in ../VERSION
 selinuxswig_python_exception.i: ../include/selinux/selinux.h
 	bash -e exception.sh > $@ || (rm -f $@ ; false)
 
-$(AUDIT2WHYLOBJ): audit2why.c
-	$(CC) $(filter-out -Werror, $(CFLAGS)) $(PYINC) -fPIC -DSHARED -c -o $@ $<
-
-$(AUDIT2WHYSO): $(AUDIT2WHYLOBJ) $(LIBSEPOLA)
-	$(CC) $(CFLAGS) $(LDFLAGS) -L. -shared -o $@ $^ -lselinux $(LDLIBS_LIBSEPOLA) $(PYLIBS) -Wl,-soname,audit2why.so,--version-script=audit2why.map,-z,defs
-
 %.o:  %.c policy.h
 	$(CC) $(CFLAGS) $(TLSFLAGS) -c -o $@ $<
 
 %.lo:  %.c policy.h
 	$(CC) $(CFLAGS) -fPIC -DSHARED -c -o $@ $<
 
-$(SWIGCOUT): $(SWIGIF)
-	$(SWIG) $<
-
-$(SWIGPYOUT): $(SWIGCOUT)
-
 $(SWIGRUBYCOUT): $(SWIGRUBYIF)
 	$(SWIGRUBY) $<
 
-swigify: $(SWIGIF)
-	$(SWIG) $<
-
 install: all 
 	test -d $(DESTDIR)$(LIBDIR) || install -m 755 -d $(DESTDIR)$(LIBDIR)
 	install -m 644 $(LIBA) $(DESTDIR)$(LIBDIR)
@@ -194,10 +173,8 @@  install: all
 	ln -sf --relative $(DESTDIR)$(SHLIBDIR)/$(LIBSO) $(DESTDIR)$(LIBDIR)/$(TARGET)
 
 install-pywrap: pywrap
-	test -d $(DESTDIR)$(PYTHONLIBDIR)/selinux || install -m 755 -d $(DESTDIR)$(PYTHONLIBDIR)/selinux
-	install -m 755 $(SWIGSO) $(DESTDIR)$(PYTHONLIBDIR)/_selinux$(PYCEXT)
-	install -m 755 $(AUDIT2WHYSO) $(DESTDIR)$(PYTHONLIBDIR)/selinux/audit2why$(PYCEXT)
-	install -m 644 $(SWIGPYOUT) $(DESTDIR)$(PYTHONLIBDIR)/selinux/__init__.py
+	$(PYTHON) setup.py install --prefix=$(PREFIX) `test -n "$(DESTDIR)" && echo --root $(DESTDIR)`
+	install -m 644 selinux.py $(DESTDIR)$(PYTHONLIBDIR)/selinux/__init__.py
 
 install-rubywrap: rubywrap
 	test -d $(DESTDIR)$(RUBYINSTALL) || install -m 755 -d $(DESTDIR)$(RUBYINSTALL) 
@@ -208,6 +185,8 @@  relabel:
 
 clean-pywrap:
 	-rm -f $(SWIGLOBJ) $(SWIGSO) $(AUDIT2WHYLOBJ) $(AUDIT2WHYSO)
+	$(PYTHON) setup.py clean
+	-rm -rf build *~ \#* *pyc .#*
 
 clean-rubywrap:
 	-rm -f $(SWIGRUBYLOBJ) $(SWIGRUBYSO)
diff --git a/libselinux/src/setup.py b/libselinux/src/setup.py
new file mode 100644
index 00000000..b12e7869
--- /dev/null
+++ b/libselinux/src/setup.py
@@ -0,0 +1,24 @@ 
+#!/usr/bin/python3
+
+from distutils.core import Extension, setup
+
+setup(
+    name="selinux",
+    version="2.9",
+    description="SELinux python 3 bindings",
+    author="SELinux Project",
+    author_email="selinux@vger.kernel.org",
+    ext_modules=[
+        Extension('selinux._selinux',
+                  sources=['selinuxswig_python.i'],
+                  include_dirs=['../include'],
+                  library_dirs=['.'],
+                  libraries=['selinux']),
+        Extension('selinux.audit2why',
+                  sources=['audit2why.c'],
+                  include_dirs=['../include'],
+                  library_dirs=['.'],
+                  libraries=['selinux'],
+                  extra_link_args=['-l:libsepol.a'])
+    ],
+)