bug#32170: python-cairocffi error "dlopen() failed to load a library: cairo / cairo-2"

bug#32170: python-cairocffi error "dlopen() failed to load a library: cairo / cairo-2"

[Ben Sturmfels]

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Hi Folks,

I'm having problems running Python code that depends on the
"python-cairocffi" package. Running "from cairocffi._ffi import ffi" on
Trisquel 8 works fine, but on GuixSD I get:

$ guix environment --container --ad-hoc python cairo python-cairocffi
$ python3.6 -c "from cairocffi._ffi import ffi"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/home/ben/.guix-profile/lib/python3.6/site-packages/cairocffi/__init__.py", line 41, in <module>
    cairo = dlopen(ffi, 'cairo', 'cairo-2')
  File "/home/ben/.guix-profile/lib/python3.6/site-packages/cairocffi/__init__.py", line 38, in dlopen
    raise OSError("dlopen() failed to load a library: %s" % ' / '.join(names))
OSError: dlopen() failed to load a library: cairo / cairo-2

The background on this is that I use the Weasyprint PDF library from
PyPI and Weasyprint issues the above "from cairocffi._ffi import ffi".

I'm running GuixSD up-to-date with the latest master branch.

Regards,
Ben

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bug#32170: python-cairocffi error "dlopen() failed to load a library: cairo / cairo-2"

[Danny Milosavljevic]

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Hi Ben,

thanks for the report.

I've fixed it in a545090ce5e6b9da1f473f558dabda69f317e461 on guix master
by allowing absolute paths as python-cairocffi's dlopen's parameter
and also substituting the sonames by the absolute paths in the callers.

python-cairocffi's dlopen is re-exported.  That means that users that
use it also have to use the absolute paths.

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bug#32170: python-cairocffi error "dlopen() failed to load a library: cairo / cairo-2"

[Ben Sturmfels]

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On 17/07/18 07:54, Danny Milosavljevic wrote:
> Hi Ben,
> 
> thanks for the report.
> 
> I've fixed it in a545090ce5e6b9da1f473f558dabda69f317e461 on guix master
> by allowing absolute paths as python-cairocffi's dlopen's parameter
> and also substituting the sonames by the absolute paths in the callers.
> 
> python-cairocffi's dlopen is re-exported.  That means that users that
> use it also have to use the absolute paths.

Thanks Danny, I appreciate you squashing this one so quickly!

Regards,
Ben


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