[gentoo-dev] [PATCH] install-qa-check.d: Add check for missing Python bytecode (.pyc)

[Michał Górny]

Add a check that detects Python modules that were not compiled after
installation.  To limit false positives, this is only done on modules
installed to site-packages.

Early testing of this check made it possible to detect a bug
in python_optimize.

Signed-off-by: Michał Górny <mgorny@g.o>
---
 metadata/install-qa-check.d/60python-pyc | 83 ++++++++++++++++++++++++
 1 file changed, 83 insertions(+)
 create mode 100644 metadata/install-qa-check.d/60python-pyc

diff --git a/metadata/install-qa-check.d/60python-pyc b/metadata/install-qa-check.d/60python-pyc
new file mode 100644
index 000000000000..7fe3b0c963d1
--- /dev/null
+++ b/metadata/install-qa-check.d/60python-pyc
@@ -0,0 +1,83 @@
+# Copyright 2019 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+# QA check: ensure that Python modules are compiled after installing
+# Maintainer: Python project <python@g.o>
+
+inherit python-utils-r1
+
+python_pyc_check() {
+	local impl missing=() outdated=()
+	for impl in "${_PYTHON_SUPPORTED_IMPLS[@]}"; do
+		python_export "${impl}" EPYTHON PYTHON
+		local sitedir=$(python_get_sitedir "${impl}")
+
+		if [[ -d ${D}${sitedir} ]]; then
+			local suffixes=() subdir=
+			case ${EPYTHON} in
+				python2*)
+					suffixes=( .py{c,o} )
+					;;
+				pypy)
+					suffixes=( .pyc )
+					;;
+				python3*|pypy3*)
+					local tag=$("${PYTHON}" -c 'import sys; print(sys.implementation.cache_tag)')
+					suffixes=( ".${tag}"{,.opt-{1,2}}.pyc )
+					subdir=__pycache__/
+					;;
+				*)
+					# skip testing unknown impl
+					continue
+					;;
+			esac
+
+			einfo "Verifying compiled files in ${sitedir}"
+			local f s
+			while read -d $'\0' -r f; do
+				local dir=${f%/*}
+				local basename=${f##*/}
+				basename=${basename%.py}
+
+				for s in "${suffixes[@]}"; do
+					local cache=${dir}/${subdir}${basename}${s}
+					if [[ ! -f ${cache} ]]; then
+						missing+=( "${cache}" )
+					elif [[ ${f} -nt ${cache} ]]; then
+						outdated+=( "${cache}" )
+					fi
+				done
+			done < <(find "${D}${sitedir}" -name '*.py' -print0)
+		fi
+	done
+
+	if [[ ${missing[@]} ]]; then
+		eqawarn
+		eqawarn "This package installs one or more Python modules that are not byte-compiled."
+		eqawarn "The following files are missing:"
+		eqawarn
+		eqatag -v python-pyc.missing "${missing[@]#${D}}"
+	fi
+
+	if [[ ${outdated[@]} ]]; then
+		eqawarn
+		eqawarn "This package installs one or more compiled Python modules that have older"
+		eqawarn "timestamps than the corresponding source files:"
+		eqawarn
+		eqatag -v python-pyc.outdated "${outdated[@]#${D}}"
+	fi
+
+	if [[ ${missing[@]} || ${outdated[@]} ]]; then
+		eqawarn
+		eqawarn "Please either fix the upstream build system to byte-compile Python modules"
+		eqawarn "correctly, or call python_optimize after installing them.  For more"
+		eqawarn "information, see:"
+		eqawarn "https://wiki.gentoo.org/wiki/Project:Python/Byte_compiling"
+		eqawarn
+	fi
+}
+
+python_pyc_check
+: # guarantee successful exit
+
+# vim:ft=ebuild
-- 
2.23.0