ttconv: FTBFS building against python 3.15

Emmanuel Arias <[email protected]> Sat, 22 Aug 2026 18:55:34 -0300

Newsgroups	gmane.linux.debian.devel.python
Message-ID	<aooXg_Raysb5XRzG@debian>

Package: src:ttconv
Version: 1.2.2-1 
User: [email protected]
Usertags: python3.15
Control: forwarded -1 https://github.com/sandflow/ttconv/pull/544

¡Hola!

While rebuilding packages against python 3.15 we found that ttconv
produces some errors when used against it. The packages fails to build
from source [0].

Seems that the attribute _MISSING_TYPE from dataclasses is used and it
doesn't exists (at least) in python3.15. To fix it we should use
MISSING instead of _MISSING_TYPE.  I'm attaching a patch that fix this
issue.

[0] https://debusine.debian.net/debian/r-python-python3.15/artifact/4393731/

-- 
cheers,
        Emmanuel Arias

 ⢀⣴⠾⠻⢶⣦⠀
 ⣾⠁⢠⠒⠀⣿⡁  [email protected]
 ⢿⡄⠘⠷⠚⠋⠀  OpenPGP: 13796755BBC72BB8ABE2AEB5 FA9DEC5DE11C63F1
 ⠈⠳⣄

ttconv-python3.15.debdiff (text/plain, 2 KB)

diff -Nru ttconv-1.2.2/debian/changelog ttconv-1.2.2/debian/changelog
--- ttconv-1.2.2/debian/changelog	2026-06-08 14:51:37.000000000 -0300
+++ ttconv-1.2.2/debian/changelog	2026-08-22 18:47:41.000000000 -0300
@@ -1,3 +1,10 @@
+ttconv (1.2.2-2) UNRELEASED; urgency=medium
+
+  * Team upload
+  * d/patches/544.patch: Add patch to build correctly in py3.15.
+
+ -- Emmanuel Arias <[email protected]>  Sat, 22 Aug 2026 18:47:41 -0300
+
 ttconv (1.2.2-1) unstable; urgency=medium
 
   * New upstream version
diff -Nru ttconv-1.2.2/debian/patches/544.patch ttconv-1.2.2/debian/patches/544.patch
--- ttconv-1.2.2/debian/patches/544.patch	1969-12-31 21:00:00.000000000 -0300
+++ ttconv-1.2.2/debian/patches/544.patch	2026-08-22 18:35:33.000000000 -0300
@@ -0,0 +1,23 @@
+From f3ee2d94b6ee5eb1d574e0ae0accd52b11cde8c7 Mon Sep 17 00:00:00 2001
+From: Emmanuel Arias <[email protected]>
+Date: Sat, 22 Aug 2026 18:31:35 -0300
+Subject: [PATCH] Remove use of dataclasses._MISSING_TYPE
+
+Use dataclasses.MISSING instead. In py3.15 tests fails.
+---
+ src/main/python/ttconv/config.py | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/main/python/ttconv/config.py b/src/main/python/ttconv/config.py
+index dbb4f066..961b6796 100644
+--- a/src/main/python/ttconv/config.py
++++ b/src/main/python/ttconv/config.py
+@@ -73,7 +73,7 @@ def parse(cls, config_dict: Dict) -> ModuleConfiguration:
+   @staticmethod
+   def get_field_default(field: dataclasses.Field) -> Optional[Any]:
+     """Returns the default field value if any, None otherwise"""
+-    if isinstance(field.default, dataclasses._MISSING_TYPE):
++    if field.default is dataclasses.MISSING:
+       return None
+     return field.default
+ 
diff -Nru ttconv-1.2.2/debian/patches/series ttconv-1.2.2/debian/patches/series
--- ttconv-1.2.2/debian/patches/series	2026-06-08 14:51:37.000000000 -0300
+++ ttconv-1.2.2/debian/patches/series	2026-08-22 18:35:55.000000000 -0300
@@ -1 +1,2 @@
 skip-broken-unittests.patch
+544.patch

signature.asc (application/pgp-signature, 833 B)