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cairocffi_to_pycairo doesn't work in fedora #78

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stuaxo opened this issue Jan 20, 2016 · 14 comments
Open

cairocffi_to_pycairo doesn't work in fedora #78

stuaxo opened this issue Jan 20, 2016 · 14 comments
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@stuaxo
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stuaxo commented Jan 20, 2016

On fedora (disclaimer: not usually a fedora user) - cairocffi_to_pycairo.py doesn't seem to work

 $ python -c 'from cairocffi_to_pycairo.py import *'
[devel@b1e68ff9c787 utils]$ python -c 'from cairocffi_to_pycairo.py import *'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "cairocffi_to_pycairo.py", line 8, in <module>
    pycairo.PycairoContext_FromContext.restype = ctypes.c_void_p
  File "/usr/lib64/python2.7/ctypes/__init__.py", line 373, in __getattr__
    func = self.__getitem__(name)
  File "/usr/lib64/python2.7/ctypes/__init__.py", line 378, in __getitem__
    func = self._FuncPtr((name_or_ordinal, self))
AttributeError: /usr/lib64/python2.7/site-packages/cairo/_cairo.so: undefined symbol: PycairoContext_FromContext

I've made a Dockerfile that can repro the issue https://github.com/stuaxo/docker-fedora-cairocffi-bug run ./build.sh then ./run.sh
@SimonSapin
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Can you check what symbols are in the .so file?

readelf -Ws /usr/lib64/python2.7/site-packages/cairo/_cairo.so

(I don’t know how to use Docker, and I’m not all that interested.)

@stuaxo
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stuaxo commented Jan 21, 2016

Here you go -

$ readelf -Ws /usr/lib64/python2.7/site-packages/cairo/_cairo.so

Symbol table '.dynsym' contains 280 entries:
   Num:    Value          Size Type    Bind   Vis      Ndx Name
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     5: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND cairo_rel_line_to
     6: 0000000000000000     0 NOTYPE  GLOBAL DEFAULT  UND PyList_New
     7: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND cairo_matrix_invert
     8: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND cairo_copy_page
     9: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND cairo_version_string
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    22: 0000000000000000     0 NOTYPE  GLOBAL DEFAULT  UND PyObject_AsWriteBuffer
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    36: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND cairo_matrix_init_rotate
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@SimonSapin
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On my system this shows a number of symbols that start with Pycairo for the C API: http://cairographics.org/documentation/pycairo/2/pycairo_c_api.html

I don’t know where they are on your system, but that’s not something cairocffi can do anything about.

@stuaxo
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stuaxo commented Jan 21, 2016

My real system is Ubuntu and readelf looks a lot more sane. For my own use, turns out I wasn't using this code.

It looks like a bug in fedora, but not being a fedora user I don't know where to start upstreaming this bug.

Possibly worth closing until an actual fedora user hits this, then get them to whoever packages cairo for fedora.

@stuaxo
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stuaxo commented Jan 21, 2016

Bah, spoke to soon - I do use that function ... but not fedora. Will either refactor code to just do this in the other direction or work out something else :)

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Maybe write a module in C that uses pycairo’s C API to see if it works on Fedora and sees what .so files it loads?

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stuaxo commented Jan 23, 2016

I've never tried writing a C module before, but might give it a go. In the meantime, I'll try this with a standard non-docker VM and see if it works.

It's weird - as I installed pycairo + cairocffi using their standard package manager - ie dnf install -y python-cairocffi dnf install -y python-pycairo, I would expect them to just work, but maybe it's something wrong with my setup.

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stuaxo commented Feb 8, 2016

Another data-point: got the same thing happen on Windows... (maybe I can use dependency walker to check what symbols are available, but it's not something I'm familiar with).

To get a cairo dll there, I have installed the pygtk-all-in-one installer, though my codebase is Gtk3, so I use pygobject for windows: http://opensourcepack.blogspot.co.uk/p/pygobject-pygi-aio.html for that.

Will see what they say on the cairo mailing list.

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stuaxo commented Mar 30, 2016

It seems to be the same .so in Fedora, and not be available. I can only think that something must have changed in the way cairo was built that is making the symbol not show up. Next step I'll try and build cairo in a fedora vm and see if the symbol is available.

I'm also wondering if it will be possible to implement this in an alternate way using some of the other Py* functions.

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Note that it’s a question of how pycairo is built, not cairo. They are two separate projects with their own source repositories, and are typically packaged separately in distributions.

PycairoContext_FromContext is defined here: https://cgit.freedesktop.org/py2cairo/tree/src/context.c#n38 . You may be able to duplicate it in Python + ctypes, but that sounds very brittle, on top of the already-brittle cairocffi_to_pycairo hack.

@liZe liZe added the bug label Aug 27, 2016
@lazka
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lazka commented Jul 19, 2017

Here is some code implementing the pycairo->cairocffi conversion using only the public API: pygobject/pycairo#59 (comment)

Feel free to use it under the cairocffi license.

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stuaxo commented Mar 14, 2019

Great, @lazka's version works, I will see if I can make a PR of it.

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stuaxo commented Jun 4, 2019

Looks like the one on bpaste disappeared (I really should have taken a copy of that a the time, doh)

@riaqn
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riaqn commented Apr 13, 2022 •
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Hello, what's the status on this? I'm having a similar issue: PycairoContext_FromContext is not in the pycairo .so file - any ideas? My guess is that those functions are not used inside pycairo and thus optimized out?

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