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From: Santiago Vila &lt;sanvila@debian.org&gt;
To: Debian BTS &lt;submit@bugs.debian.org&gt;
Subject: trollimage: FTBFS: E PendingDeprecationWarning: Use `@` matmul
 instead of `*` mul operator for matrix multiplication
X-Debbugs-Cc: sanvila@debian.org
Message-Id: &lt;E1x0oSu-006VpT-2h@paradis.debian.org&gt;
Date: Sun, 30 Aug 2026 22:57:28 +0000
Delivered-To: submit@bugs.debian.org

Package: src:trollimage
Version: 1.28.0-1
Severity: serious
Tags: ftbfs forky sid

Dear maintainer:

During a rebuild of all packages in unstable, this package failed to build.

Below you will find the last part of the build log (probably the most
relevant part, but not necessarily). If required, the full build log
is available here:

https://people.debian.org/~sanvila/build-logs/202608/

About the archive rebuild: The build was made on virtual machines from AWS,
using sbuild and a reduced chroot with only build-essential packages.

If you cannot reproduce the bug please contact me privately, as I
am willing to provide ssh access to a virtual machine where the bug is
fully reproducible.

If this is really a bug in one of the build-depends, please use
reassign and add an affects on src:trollimage, so that this is still
visible in the BTS web page for this package.

Thanks.

--------------------------------------------------------------------------------
[...]

self = Affine(1.0, 0.0, -300.0,
       0.0, 1.0, 250.0)
other = Affine(100.0, 0.0, 0.0,
       0.0, -100.0, 0.0)

    def __mul__(self, other):
        &quot;&quot;&quot;Multiplication.
    
        Apply the transform using matrix multiplication, creating
        a resulting object of the same type.  A transform may be applied
        to another transform, a vector, vector array, or shape.
    
        Parameters
        ----------
        other : Affine or iterable of (vx, vy)
    
        Returns
        -------
        Affine or a tuple of two items
    
        .. deprecated:: 3.1.0
            Use `@` matmul instead of `*` mul operator for matrix multiplication.
        &quot;&quot;&quot;
        # TODO: consider elevating to DeprecationWarning for 3.2
&gt;       warnings.warn(
            &quot;Use `@` matmul instead of `*` mul operator for matrix multiplication&quot;,
            PendingDeprecationWarning,
            stacklevel=2,
        )
E       PendingDeprecationWarning: Use `@` matmul instead of `*` mul operator for matrix multiplication

other      = Affine(100.0, 0.0, 0.0,
       0.0, -100.0, 0.0)
self       = Affine(1.0, 0.0, -300.0,
       0.0, 1.0, 250.0)

/usr/lib/python3/dist-packages/affine/__init__.py:623: PendingDeprecationWarning
=========================== short test summary info ============================
SKIPPED [1] ../../../../../../usr/lib/python3/dist-packages/_pytest/unittest.py:523: no display
FAILED trollimage/tests/test_xrimage.py::TestXRImage::test_save_geotiff_int_with_area_def
============ 1 failed, 308 passed, 1 skipped, 3 deselected in 4.37s ============
E: pybuild pybuild:485: test: plugin pyproject failed with: exit code=1: cd /&lt;&lt;PKGBUILDDIR&gt;&gt;/.pybuild/cpython3_3.14_trollimage/build; python3.14 -m pytest -k &quot;not test_gamma_per_channel&quot; --pyargs trollimage
dh_auto_test: error: pybuild --test --test-pytest -i python{version} -p 3.14 --parallel=2 returned exit code 13
make: *** [debian/rules:16: binary] Error 25
dpkg-buildpackage: error: debian/rules binary subprocess failed with exit status 2
--------------------------------------------------------------------------------
]