Bump the minimum python version to 3.9

The minimum python version when installing from source is now python 3.9, as Pyside6 6.7.1 dropped support for python 3.8 (see #780 for more information). On Debian-derivatives distributions, the minimum Python version is now set to 3.8. In practice, because Pyside6 is not packaged for Debian, we use Pyside2 [0], which is why we can relax the python version requirement. In practice, when installing from source on an environment where python3.9 is not the default python, poetry will look for it and use it if available > For various reasons, this Python version might not be compatible with > the python range supported by the project. In this case, Poetry will > try to find one that is and use it. > > [Poetry docs](https://python-poetry.org/docs/managing-environments/) On Ubuntu Focal (20.04) where Python 3.9 is not installed by default, it is possible to install it using the `python3.9` package. Additionally, In version 1.24.3, PyMuPDF changed its package name from `fitz` to `pymupdf` [2], resulting in a breakage on how it is installed in our container. This is now fixed. [0] More information on how Pyside6 packaging affects dangerzone on #221 [1] See [the current status of Pyside6 packaging](https://repology.org/ project/python:pyside6/packages) [2] PyMuPDF changelog: https://pymupdf.readthedocs.io/en/latest/changes.html#change-log
freedomofpress · Jun 4, 2024 · c01515b · c01515b
1 parent 2aee6f4
commit c01515b
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diff --git a/BUILD.md b/BUILD.md
@@ -33,6 +33,30 @@ Install dependencies:
   </tr>
 </table>
 
+
+<table>
+  <tr>
+      <td>
+<details>
+  <summary><i>:memo: Expand this section if you are on Ubuntu 20.04 (Focal).</i></summary>
+  </br>
+
+  The default Python version that ships with Ubuntu Focal (3.8) is not
+  compatible with PySide6, which requires Python 3.9 of greater.
+
+  You can install Python 3.9 using the `python3.9` package.
+
+  ```bash
+  sudo apt install -y python3.9
+  ```
+
+  Poetry will automatically pick up the correct version when running.
+</details>
+    </td>
+  </tr>
+</table>
+
+
 ```sh
 sudo apt install -y podman dh-python build-essential fakeroot make libqt6gui6 \
     pipx python3 python3-dev python3-stdeb python3-all

diff --git a/Dockerfile b/Dockerfile
@@ -8,7 +8,7 @@ ARG REQUIREMENTS_TXT
 # Install PyMuPDF via hash-checked requirements file
 COPY ${REQUIREMENTS_TXT} /tmp/requirements.txt
 RUN apk --no-cache add linux-headers g++ linux-headers gcc make python3-dev py3-pip clang-dev
-RUN pip install --break-system-packages --require-hashes -r /tmp/requirements.txt
+RUN pip install -vv --break-system-packages --require-hashes -r /tmp/requirements.txt
 
 
 ###########################################
@@ -62,6 +62,7 @@ RUN apk --no-cache -U upgrade && \
     font-noto-cjk
 
 COPY --from=pymupdf-build /usr/lib/python3.12/site-packages/fitz/ /usr/lib/python3.12/site-packages/fitz
+COPY --from=pymupdf-build /usr/lib/python3.12/site-packages/pymupdf/ /usr/lib/python3.12/site-packages/pymupdf
 COPY --from=tessdata-dl /usr/share/tessdata/ /usr/share/tessdata
 COPY --from=h2orestart-dl /libreoffice_ext/ /libreoffice_ext
 

diff --git a/dev_scripts/env.py b/dev_scripts/env.py
@@ -100,7 +100,7 @@
 ARG DEBIAN_FRONTEND=noninteractive
 
 RUN apt-get update \
-    && apt-get install -y python-all curl wget gnupg2 \
+    && apt-get install -y python-all python3.9 curl wget gnupg2 \
     && rm -rf /var/lib/apt/lists/*
 RUN . /etc/os-release \
     && sh -c "echo 'deb http://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable/xUbuntu_$VERSION_ID/ /' \

diff --git a/dev_scripts/qa.py b/dev_scripts/qa.py
@@ -216,6 +216,30 @@
   </tr>
 </table>
 
+
+<table>
+  <tr>
+      <td>
+<details>
+  <summary><i>:memo: Expand this section if you are on Ubuntu 20.04 (Focal).</i></summary>
+  </br>
+
+  The default Python version that ships with Ubuntu Focal (3.8) is not
+  compatible with PySide6, which requires Python 3.9 of greater.
+
+  You can install Python 3.9 using the `python3.9` package.
+
+  ```bash
+  sudo apt install -y python3.9
+  ```
+  
+  Poetry will automatically pick up the correct version when running.
+</details>
+    </td>
+  </tr>
+</table>
+
+
 ```sh
 sudo apt install -y podman dh-python build-essential fakeroot make libqt6gui6 \
     pipx python3 python3-dev python3-stdeb python3-all

diff --git a/poetry.lock b/poetry.lock
diff --git a/pyproject.toml b/pyproject.toml
@@ -13,10 +13,10 @@ include = [
 ]
 
 [tool.poetry.dependencies]
-python = ">=3.8,<3.13"
+python = ">=3.9,<3.13"
 click = "*"
 appdirs = "*"
-PySide6 = "^6.4.1"
+PySide6 = "^6.7.1"
 colorama = "*"
 pyxdg = {version = "*", platform = "linux"}
 requests = "*"

diff --git a/stdeb.cfg b/stdeb.cfg
@@ -3,7 +3,7 @@ Package3: dangerzone
 Depends3: podman, python3, python3-pyside2.qtcore, python3-pyside2.qtgui, python3-pyside2.qtwidgets, python3-pyside2.qtsvg, python3-appdirs, python3-click, python3-xdg, python3-colorama, python3-requests, python3-markdown, python3-packaging
 Build-Depends: dh-python, python3, python3-setuptools, python3-stdeb
 Suite: bionic
-X-Python3-Version: >= 3.6
+X-Python3-Version: >= 3.8
 # Do not trigger testing when we build the package. Assume that the user
 # has tested the package already. For more info, see:
 # https://github.com/freedomofpress/dangerzone/issues/292#issuecomment-1349967888