Hi,

This batch includes some minor refactoring, plus two major experimental features (to be enabled via `make.conf` by people ready to test them):

1. DISTUTILS_ALLOW_PYC_SYMLINKS to symlink matching .pyc files across
optimization levels, e.g.:

__init__.opt-2.pyc -> __init__.opt-1.pyc
__init__.opt-1.pyc -> __init__.pyc

2. DISTUTILS_ALLOW_CROSS_IMPL_SYMLINKS to symlink matching files across
different Python implementations and save lots of space, e.g.:

python3.11/site-packages/frobnicate.py
python3.12/site-packages/frobnicate.py -> ../../python3.11/site-packages/frobnicate.py
python3.13/site-packages/frobnicate.py -> ../../python3.11/site-packages/frobnicate.py

This can specifically help with large .py files, lots of data
installed in package directory and stable ABI extensions.

Both features are opt-in, and at this point considered experimental
and dangerous. We may consider making the first one opt-out
in the future, but I want to test both extensively first.

Note that we may independently of this start moving package data
out of site-packages and into /usr/share for some large packages.


Michał Górny (4):
python-utils-r1.eclass: Simplify _python_impl_matches
distutils-r1.eclass: Quote DISTUTILS_ALLOW_WHEEL_REUSE
distutils-r1.eclass: Support .pyc symlinking
distutils-r1.eclass: Support cross-impl symlinks

eclass/distutils-r1.eclass | 81 ++++++++++++++++++++++++++++++++++-
eclass/python-utils-r1.eclass | 4 +-
2 files changed, 81 insertions(+), 4 deletions(-)

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

Remove special case for '3.10' in _python_impl_matches -- it was only
necessary because we needed to handle 'pypy3' target specially,
and that is no longer the case. Technically, the code checks for
'pypy3_10' but that's not a problem, since there is no such a thing.

Signed-off-by: Michał Górny <mgorny@gentoo.org>
---
eclass/python-utils-r1.eclass | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/eclass/python-utils-r1.eclass b/eclass/python-utils-r1.eclass index ef05a58e1b13..3a4a3f19a1be 100644
--- a/eclass/python-utils-r1.eclass
+++ b/eclass/python-utils-r1.eclass
@@ -230,9 +230,7 @@ _python_impl_matches() {
fi
return 0
;;
- 3.10)
- ;;
- 3.8|3.9|3.1[1-3])
+ 3.[89]|3.1[0-3])
[[ ${impl%t} == python${pattern/./_} || ${impl} == pypy${pattern/./_} ]] &&
return 0
;;

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

Reported-by: Ionen Wolkens <ionen@gentoo.org>
Signed-off-by: Michał Górny <mgorny@gentoo.org>
---
eclass/distutils-r1.eclass | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/eclass/distutils-r1.eclass b/eclass/distutils-r1.eclass
index 880e33cd741f..799206f7eb03 100644
--- a/eclass/distutils-r1.eclass
+++ b/eclass/distutils-r1.eclass
@@ -215,7 +215,7 @@
# This is an optimization that can avoid the overhead of calling into
# the build system in pure Python packages and packages using the stable
# Python ABI.
-: ${DISTUTILS_ALLOW_WHEEL_REUSE=1}
+: "${DISTUTILS_ALLOW_WHEEL_REUSE=1}"

# @ECLASS_VARIABLE: BUILD_DIR
# @OUTPUT_VARIABLE

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

Support replacing installed files with cross-implementation symlinks
to save space. Opt-in via `DISTUTILS_ALLOW_CROSS_IMPL_SYMLINKS`
variable.

Closes: https://bugs.gentoo.org/954762
Signed-off-by: Michał Górny <mgorny@gentoo.org>
---
eclass/distutils-r1.eclass | 66 ++++++++++++++++++++++++++++++++++++++
1 file changed, 66 insertions(+)

diff --git a/eclass/distutils-r1.eclass b/eclass/distutils-r1.eclass
index 32cff457e996..d2e4f9ce7ba0 100644
--- a/eclass/distutils-r1.eclass
+++ b/eclass/distutils-r1.eclass
@@ -227,6 +227,18 @@
# Note that it requires >=dev-python/gpep517-19.
: "${DISTUTILS_ALLOW_PYC_SYMLINKS=}"

+# @ECLASS_VARIABLE: DISTUTILS_ALLOW_CROSS_IMPL_SYMLINKS
+# @USER_VARIABLE
+# @DESCRIPTION:
+# If set to a non-empty value, the eclass will replace identical files
+# from installed wheels with symlinks, across different Python
+# implementations. This may include .py files, variety of data files
+# and stable ABI extensions.
+#
+# This is an optimization that can reduce disk space usage when packages
+# are built for multiple Python implementations.
+: "${DISTUTILS_ALLOW_CROSS_IMPL_SYMLINKS=}"
+
# @ECLASS_VARIABLE: BUILD_DIR
# @OUTPUT_VARIABLE
# @DEFAULT_UNSET
@@ -1233,6 +1245,33 @@ distut

Support replacing identical .pyc files with symlinks, using gpep517-19
option `--symlink-pyc`. Opt in via `DISTUTILS_ALLOW_PYC_SYMLINKS`
variable.

Signed-off-by: Michał Górny <mgorny@gentoo.org>
---
eclass/distutils-r1.eclass | 13 +++++++++++++
1 file changed, 13 insertions(+)

diff --git a/eclass/distutils-r1.eclass b/eclass/distutils-r1.eclass
index 799206f7eb03..32cff457e996 100644
--- a/eclass/distutils-r1.eclass
+++ b/eclass/distutils-r1.eclass
@@ -217,6 +217,16 @@
# Python ABI.
: "${DISTUTILS_ALLOW_WHEEL_REUSE=1}"

+# @ECLASS_VARIABLE: DISTUTILS_ALLOW_PYC_SYMLINKS
+# @USER_VARIABLE
+# @DESCRIPTION:
+# If set to a non-empty value, the eclass is allowed to create symlinks
+# between different optimization levels of compiled .pyc files.
+#
+# This is an optimization that can slightly reduce disk space usage.
+# Note that it requires >=dev-python/gpep517-19.
+: "${DISTUTILS_ALLOW_PYC_SYMLINKS=}"
+
# @ECLASS_VARIABLE: BUILD_DIR
# @OUTPUT_VARIABLE
# @DEFAULT_UNSET
@@ -1220,6 +1230,9 @@ distutils_wheel_install() {
--optimize=all
"${wheel}"
)
+ if [[ ${DISTUTILS_ALLOW_PYC_SYMLINKS} ]]; then
+ cmd+=( --symlink-pyc )
+ fi
printf '%s\n' "${cmd[*]}"
"$