In the noble upload, why was python3-venv moved from Build-Depends-Arch
to Build-Depends? This is not documented in d/changelog:

--- a/debian/control
+++ b/debian/control
@@ -7,13 +7,13 @@ XSBC-Original-Maintainer: Debian QEMU Team <pkg-qemu-devel@lists.alioth.debian.o
 Uploaders: Michael Tokarev <mjt@tls.msk.ru>
 Build-Depends: debhelper-compat (= 13),
  python3:any,
+ python3-venv,
  meson (>> 0.63.0~), ninja-build,
  flex, bison,
 Build-Depends-Arch:
 # In comments below we also specify (system-specific) arguments
 # to qemu's configure script, -- optional features which depend
 # on build-dependencies.
- python3-venv,
 # --enable-docs
 # for python3-sphinx:native see #995622
  texinfo, python3-sphinx:native, python3-sphinx-rtd-theme,


** Changed in: qemu (Ubuntu Noble)
       Status: In Progress => Incomplete

-- 
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https://bugs.launchpad.net/bugs/2133804

Title:
  QEMU does not emulate IOCTL TCGETS2

Status in QEMU:
  Fix Released
Status in qemu package in Ubuntu:
  Fix Released
Status in qemu source package in Jammy:
  Confirmed
Status in qemu source package in Noble:
  Incomplete
Status in qemu source package in Plucky:
  Won't Fix
Status in qemu source package in Questing:
  Fix Committed
Status in qemu source package in Resolute:
  Fix Released

Bug description:
  [ Impact ]

  - Terminal prompt is missing for multiarch containers with qemu-user

  - Users cannot see the prompt but still can type the commands
    However the absence of the prompt can be misleading and make users think that the container hangs.

  - this fix implements the missing ioctl TERMIOS2

  [ Test Plan ]

  On an amd64 host

  $ sudo apt install -y docker.io qemu-user-static
  $ sudo usermod -aG docker ubuntu
  $ newgrp docker
  $ docker run --platform=linux/arm64 -it ubuntu:26.04 bash
   (this runs on AMD64 host, if you are runnig on ARM64, use -platform=linux/riscv64 instead)

  After docker pulls the image and run the container, you cannot see the
  prompt

  ...
  Status: Downloaded newer image for ubuntu:26.04
  ...

  $ docker run --platform=linux/arm64 -it ubuntu:24.04 bash

  Doing the same for Ubuntu Noble image works.

  $ docker run --platform=linux/arm64 -it ubuntu:24.04 bash
  Unable to find image 'ubuntu:24.04' locally
  24.04: Pulling from library/ubuntu
  818154cda96d: Pull complete
  352b2c3faa58: Download complete
  Digest: sha256:c4a8d5503dfb2a3eb8ab5f807da5bc69a85730fb49b5cfca2330194ebcc41c7b
  Status: Downloaded newer image for ubuntu:24.04
  root@bf8124075385:/#

  With this fix, the users should see the prompt when they run bash
  interactively in the container:

  $ docker run --platform=linux/arm64 -it ubuntu:26.04 bash
  root@bf8124075385:/#

  [ Where problems could occur ]

  The fix is around the termios managament so regressions can happen there.
  There might be regressions on the prompt display.

  The prompt display is widely used so potential regressions should be
  visible quickly.

  [ Other Info ]

  None

  -- Original bug report ---

  In Ubuntu 25.10 we moved to glibc 2.42. Here glibc has changed the
  implementation of isatty(). It now uses IOCTL TCGETS2 instead of
  TCGETS. TCGETS2 is not emulated by static QEMU (qemu-riscv64, qemu-
  arm64, ...).

  This leads to failures in containers for foreign architectures. E.g. no console prompt is displayed.
  A detailed analysis is contained in LP #2133188.

  A proper implementation of the missing IOCTLs will include:

  Functions:

  in linux-user/syscall.c:
  host_to_target_termios2()
  target_to_host_termios2()
  print_termios2()

  Definitions:

  in linux-user/syscall.c
  #define termios2 host_termios2

  in linux-user/syscall_types.h
  STRUCT_SPECIAL(termios2)

  in linux-user/ioctls.h:
  IOCTL(TCGETS2, IOC_R, MK_PTR(MK_STRUCT(STRUCT_termios2)))
  IOCTL(TCSETS2, IOC_W, MK_PTR(MK_STRUCT(STRUCT_termios2)))
  IOCTL(TCSETSF2, IOC_W, MK_PTR(MK_STRUCT(STRUCT_termios2)))
  IOCTL(TCSETSW2, IOC_W, MK_PTR(MK_STRUCT(STRUCT_termios2)))

  in linux-user/user-internals.h:
  void print_termios2(void *arg);

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