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Python: Drop support for Python 3.6

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Python 3.6 was EOL 2021-12-31. Newer versions of upstream libraries have
begun dropping support for this version and it is becoming more
cumbersome to support. Avocado-framework and qemu.qmp each have their
own reasons for wanting to drop Python 3.6, but won't until QEMU does.

Versions of Python available in our supported build platforms as of today,
with optional versions available in parentheses:

openSUSE Leap 15.4: 3.6.15 (3.9.10, 3.10.2)
CentOS Stream 8:    3.6.8  (3.8.13, 3.9.16)
CentOS Stream 9:    3.9.13
Fedora 36:          3.10
Fedora 37:          3.11
Debian 11:          3.9.2
Alpine 3.14, 3.15:  3.9.16
Alpine 3.16, 3.17:  3.10.10
Ubuntu 20.04 LTS:   3.8.10
Ubuntu 22.04 LTS:   3.10.4
NetBSD 9.3:         3.9.13*
FreeBSD 12.4:       3.9.16
FreeBSD 13.1:       3.9.16
OpenBSD 7.2:        3.9.16

Note: Our VM tests install 3.9 explicitly for FreeBSD and 3.10 for
NetBSD; the default for "python" or "python3" in FreeBSD is
3.9.16. NetBSD does not appear to have a default meta-package, but
offers several options, the lowest of which is 3.7.15. "python39"
appears to be a pre-requisite to one of the other packages we request in
tests/vm/netbsd. pip, ensurepip and other Python essentials are
currently only available for Python 3.10 for NetBSD.

CentOS and OpenSUSE support parallel installation of multiple Python
interpreters, and binaries in /usr/bin will always use Python 3.6.  However,
the newly introduced support for virtual environments ensures that all build
steps that execute QEMU Python code use a single interpreter.

Since it is safe to under our supported platform policy, bump our
minimum supported version of Python to 3.7.

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20230511035435.734312-24-jsnow@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2023-05-10 23:54:31 -04:00
parent 0c5f3dcbb2
commit 5591b74511
6 changed files with 16 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
configure vendored
View File

@ -617,9 +617,9 @@ esac
check_py_version() {
# We require python >= 3.6.
# We require python >= 3.7.
# NB: a True python conditional creates a non-zero return code (Failure)
"$1" -c 'import sys; sys.exit(sys.version_info < (3,6))'
"$1" -c 'import sys; sys.exit(sys.version_info < (3,7))'
}
python=
@ -628,7 +628,7 @@ first_python=
if test -z "${PYTHON}"; then
# A bare 'python' is traditionally python 2.x, but some distros
# have it as python 3.x, so check in both places.
for binary in python3 python python3.11 python3.10 python3.9 python3.8 python3.7 python3.6; do
for binary in python3 python python3.11 python3.10 python3.9 python3.8 python3.7; do
if has "$binary"; then
python=$(command -v "$binary")
if check_py_version "$python"; then
@ -1077,7 +1077,7 @@ then
# If first_python is set, there was a binary somewhere even though
# it was not suitable. Use it for the error message.
if test -n "$first_python"; then
error_exit "Cannot use '$first_python', Python >= 3.6 is required." \
error_exit "Cannot use '$first_python', Python >= 3.7 is required." \
"Use --python=/path/to/python to specify a supported Python."
else
error_exit "Python not found. Use --python=/path/to/python"
@ -1090,7 +1090,7 @@ then
fi
if ! check_py_version "$python"; then
error_exit "Cannot use '$python', Python >= 3.6 is required." \
error_exit "Cannot use '$python', Python >= 3.7 is required." \
"Use --python=/path/to/python to specify a supported Python."
fi

2
docs/about/build-platforms.rst
View File

@ -98,7 +98,7 @@ Python runtime
option of the ``configure`` script to point QEMU to a supported
version of the Python runtime.
As of QEMU |version|, the minimum supported version of Python is 3.6.
As of QEMU |version|, the minimum supported version of Python is 3.7.
Python build dependencies
Some of QEMU's build dependencies are written in Python. Usually these

10
python/Makefile
View File

@ -9,14 +9,14 @@ help:
@echo "make check-minreqs:"
@echo " Run tests in the minreqs virtual environment."
@echo " These tests use the oldest dependencies."
@echo " Requires: Python 3.6"
@echo " Hint (Fedora): 'sudo dnf install python3.6'"
@echo " Requires: Python 3.7"
@echo " Hint (Fedora): 'sudo dnf install python3.7'"
@echo ""
@echo "make check-tox:"
@echo " Run tests against multiple python versions."
@echo " These tests use the newest dependencies."
@echo " Requires: Python 3.6 - 3.10, and tox."
@echo " Hint (Fedora): 'sudo dnf install python3-tox python3.10'"
@echo " Requires: Python 3.7 - 3.11, and tox."
@echo " Hint (Fedora): 'sudo dnf install python3-tox python3.11'"
@echo " The variable QEMU_TOX_EXTRA_ARGS can be use to pass extra"
@echo " arguments to tox".
@echo ""
@ -59,7 +59,7 @@ PIP_INSTALL = pip install --disable-pip-version-check
min-venv: $(QEMU_MINVENV_DIR) $(QEMU_MINVENV_DIR)/bin/activate
$(QEMU_MINVENV_DIR) $(QEMU_MINVENV_DIR)/bin/activate: setup.cfg tests/minreqs.txt
@echo "VENV $(QEMU_MINVENV_DIR)"
@python3.6 -m venv $(QEMU_MINVENV_DIR)
@python3.7 -m venv $(QEMU_MINVENV_DIR)
@( \
echo "ACTIVATE $(QEMU_MINVENV_DIR)"; \
. $(QEMU_MINVENV_DIR)/bin/activate; \

7
python/setup.cfg
View File

@ -14,7 +14,6 @@ classifiers =
Natural Language :: English
Operating System :: OS Independent
Programming Language :: Python :: 3 :: Only
Programming Language :: Python :: 3.6
Programming Language :: Python :: 3.7
Programming Language :: Python :: 3.8
Programming Language :: Python :: 3.9
@ -23,7 +22,7 @@ classifiers =
Typing :: Typed
[options]
python_requires = >= 3.6
python_requires = >= 3.7
packages =
qemu.qmp
qemu.machine
@ -77,7 +76,7 @@ exclude = __pycache__,
[mypy]
strict = True
python_version = 3.6
python_version = 3.7
warn_unused_configs = True
namespace_packages = True
warn_unused_ignores = False
@ -199,7 +198,7 @@ multi_line_output=3
# of python available on your system to run this test.
[tox:tox]
envlist = py36, py37, py38, py39, py310, py311
envlist = py37, py38, py39, py310, py311
skip_missing_interpreters = true
[testenv]

2
python/tests/minreqs.txt
View File

@ -1,5 +1,5 @@
# This file lists the ***oldest possible dependencies*** needed to run
# "make check" successfully under ***Python 3.6***. It is used primarily
# "make check" successfully under ***Python 3.7***. It is used primarily
# by GitLab CI to ensure that our stated minimum versions in setup.cfg
# are truthful and regularly validated.
#

2
scripts/qapi/mypy.ini
View File

@ -1,7 +1,7 @@
[mypy]
strict = True
disallow_untyped_calls = False
python_version = 3.6
python_version = 3.7
[mypy-qapi.schema]
disallow_untyped_defs = False