[Python-modules-team] Bug#902522: sorl-thumbnail: FTBFS in buster/sid (failing tests)

[Santiago Vila]

Package: src:sorl-thumbnail
Version: 12.3+git20170708-1
Severity: serious
Tags: ftbfs

Dear maintainer:

I tried to build this package in buster with "dpkg-buildpackage -A"
but it failed:

--------------------------------------------------------------------------------
[...]
 debian/rules build-indep
dh build-indep --with python2,python3,sphinxdoc --buildsystem=pybuild
   dh_update_autotools_config -i -O--buildsystem=pybuild
   dh_autoreconf -i -O--buildsystem=pybuild
   dh_auto_configure -i -O--buildsystem=pybuild
I: pybuild base:217: python2.7 setup.py config 
running config
I: pybuild base:217: python3.6 setup.py config 
running config
   debian/rules override_dh_auto_build
make[1]: Entering directory '/<<BUILDDIR>>/sorl-thumbnail-12.3+git20170708'
dh_auto_build
I: pybuild base:217: /usr/bin/python setup.py build 

[... snipped ...]

============================= test session starts ==============================
platform linux2 -- Python 2.7.15, pytest-3.3.2, py-1.5.3, pluggy-0.6.0
Django settings: tests.settings.pgmagick (from environment variable)
rootdir: /<<BUILDDIR>>/sorl-thumbnail-12.3+git20170708, inifile: setup.cfg
plugins: django-3.1.2
collected 68 items

tests/thumbnail_tests/test_alternative_resolutions.py .                  [  1%]
tests/thumbnail_tests/test_backends.py .......F.s..                      [ 19%]
tests/thumbnail_tests/test_commands.py ....                              [ 25%]
tests/thumbnail_tests/test_engines.py ..................s.....ss         [ 63%]
tests/thumbnail_tests/test_filters.py s.s.                               [ 69%]
tests/thumbnail_tests/test_kvstore.py .                                  [ 70%]
tests/thumbnail_tests/test_parsers.py .....                              [ 77%]
tests/thumbnail_tests/test_storage.py ....                               [ 83%]
tests/thumbnail_tests/test_templatetags.py ........ss.                   [100%]

=================================== FAILURES ===================================
_____________________ TestDescriptors.test_is_valid_image ______________________

self = <tests.thumbnail_tests.test_backends.TestDescriptors testMethod=test_is_valid_image>

    def test_is_valid_image(self):
        with same_open_fd_count(self):
>           self.ENGINE.is_valid_image(b'invalidbinaryimage.jpg')

tests/thumbnail_tests/test_backends.py:99: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <sorl.thumbnail.engines.pgmagick_engine.Engine object at 0x7fb03a699710>
raw_data = 'invalidbinaryimage.jpg'

    def is_valid_image(self, raw_data):
        blob = Blob()
        blob.update(raw_data)
>       im = Image(blob)
E       RuntimeError: Magick: Unable to deduce image format () reported by magick/blob.c:739 (BlobToImage)

sorl/thumbnail/engines/pgmagick_engine.py:29: RuntimeError
================ 1 failed, 59 passed, 8 skipped in 1.22 seconds ================
debian/rules:22: recipe for target 'override_dh_auto_test' failed
make[1]: *** [override_dh_auto_test] Error 1
make[1]: Leaving directory '/<<BUILDDIR>>/sorl-thumbnail-12.3+git20170708'
debian/rules:10: recipe for target 'build-indep' failed
make: *** [build-indep] Error 2
dpkg-buildpackage: error: debian/rules build-indep subprocess returned exit status 2
--------------------------------------------------------------------------------

The above is how the build ends in my autobuilder and it's not
necessarily the relevant part.

The failure is not, however, related to using dpkg-buildpackage -A,
as it also fails in reproducible builds:

https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/sorl-thumbnail.html

If this is really a bug in one of the build-depends, please use reassign and affects,
so that this is still visible in the page for this package.

Thanks.