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authorMichał Górny <mgorny@gentoo.org>2021-01-30 13:16:35 +0100
committerMichał Górny <mgorny@gentoo.org>2021-01-30 13:16:53 +0100
commit22323b8313dbe3f0b08f5b1ce2fb2f7ae26ee642 (patch)
parent2021-01-05-libressl-support-discontinued: add (diff)
2021-01-30-python-preference-to-follow-PYTHON-TARGETS: add
Signed-off-by: Michał Górny <mgorny@gentoo.org>
1 files changed, 48 insertions, 0 deletions
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+Title: Python preference to follow PYTHON_TARGETS
+Author: Michał Górny <mgorny@gentoo.org>
+Posted: 2021-01-30
+Revision: 1
+News-Item-Format: 2.0
+On 2021-02-01 stable users will switch to a new method of updating
+the preferred Python versions that employs the configuration update
+mechanism in order to follow PYTHON_TARGETS. We will also deprecate
+app-eselect/eselect-python, and it will stop being installed by default
+after 2021-07-01. If you wish to use the newest Python version present
+in your PYTHON_TARGETS, you only have to accept configuration changes.
+If you wish to customize the behavior, read on.
+Since 2017, /usr/bin/python and the related non-versioned symlinks
+are wrapped through dev-lang/python-exec. The list of preferred Python
+implementations is stored in /etc/python-exec/python-exec.conf and/or
+per-program /etc/python-exec/<basename>.conf configuration files.
+To preserve backwards compatibility, app-eselect/eselect-python remained
+a wrapper that updated this file.
+However, this mechanism alone has proven inconvenient to end users who
+had to update python-exec.conf whenever the default PYTHON_TARGETS
+changed. Thanks to the fallback logic, this was not a major problem
+for software installed via Gentoo packages that always ensure that
+a supported implementation is used. However, users have reported that
+whenever the preference for /usr/bin/python mismatched their
+PYTHON_TARGETS, their custom scripts would break due to unsatisfied
+dependencies. This does not follow the principle of least surprise.
+For this reason, we have decided to change the default python-exec
+configuration to match PYTHON_TARGETS by default, in the eclass
+preference order, that is from the newest CPython version to oldest,
+with alternative Python implementations coming afterwards. This change
+will be propagated via the configuration protection mechanism whenever
+dev-lang/python-exec-conf is installed or rebuilt due to PYTHON_TARGETS
+changes. This will permit the users to interactively confirm
+the updates.
+If the new default is not correct for you, please use your preferred
+configuration update tool to discard or edit the new configuration file.
+Furthermore, dev-lang/python will no longer attempt to automatically
+update the Python interpreter preference, or pull in eselect-python
+automatically. If you wish to continue using it, please install/record
+it explicitly to ensure that it is not unmerged, e.g.:
+ emerge -n app-eselect/eselect-python