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Edit: /usr/lib/rpm/brp-scl-python-bytecompile

#!/bin/bash
errors_terminate=$2
scl_path=$3

# If using normal root, avoid changing anything.
if [ -z "$RPM_BUILD_ROOT" -o "$RPM_BUILD_ROOT" = "/" ]; then
	exit 0
fi

[ "0$scl_path" = "0" ] && exit 0

# If we don't have a python interpreter, avoid changing anything.
default_python=${1:-/usr/bin/python}
if [ ! -x "$default_python" ]; then
	exit 0
fi

# Figure out how deep we need to descend.  We could pick an insanely high
# number and hope it's enough, but somewhere, somebody's sure to run into it.
depth=`(find "$RPM_BUILD_ROOT" -type f -name "*.py" -print0 ; echo /) | \
       xargs -0 -n 1 dirname | sed 's,[^/],,g' | sort -u | tail -n 1 | wc -c`
if [ -z "$depth" -o "$depth" -le "1" ]; then
	exit 0
fi

# .pyc/.pyo files embed a "magic" value, identifying the ABI version of Python
# bytecode that they are for.
#
# The files below RPM_BUILD_ROOT could be targeting multiple versions of
# python (e.g. a single build that emits several subpackages e.g. a
# python26-foo subpackage, a python31-foo subpackage etc)
#
# Support this by assuming that below each /usr/lib/python$VERSION/, all
# .pyc/.pyo files are to be compiled for /usr/bin/python$VERSION.
# 
# For example, below /usr/lib/python2.6/, we're targeting /usr/bin/python2.6
# and below /usr/lib/python3.1/, we're targeting /usr/bin/python3.1

shopt -s nullglob
for python_libdir in "$RPM_BUILD_ROOT"/usr/lib{,64}/python[0-9].[0-9]/ "$RPM_BUILD_ROOT"/$scl_path/usr/lib{,64}/python[0-9].[0-9]/;
do
	python_binary=/usr/bin/$(basename $python_libdir)
	real_libdir=${python_libdir/$RPM_BUILD_ROOT/}
	echo "Bytecompiling .py files below $python_libdir using $python_binary"

# Generate normal (.pyc) byte-compiled files.
	$python_binary -c 'import compileall, sys; sys.exit(not compileall.compile_dir("'"$python_libdir"'", '"$depth"', "'"$real_libdir"'", force=1, quiet=1))'
	if [ $? -ne 0 -a 0$errors_terminate -ne 0 ]; then
		# One or more of the files had a syntax error
		exit 1
	fi

# Generate optimized (.pyo) byte-compiled files.
	$python_binary -O -c 'import compileall, sys; sys.exit(not compileall.compile_dir("'"$python_libdir"'", '"$depth"', "'"$real_libdir"'", force=1, quiet=1))'
	if [ $? -ne 0 -a 0$errors_terminate -ne 0 ]; then
		# One or more of the files had a syntax error
		exit 1
	fi
done

# Handle other locations in the filesystem using the default python
# implementation:

# Generate normal (.pyc) byte-compiled files.
$default_python -c 'import compileall, re, sys; sys.exit (not compileall.compile_dir("'"$RPM_BUILD_ROOT"'", '"$depth"', "/", 1, re.compile(r"'"/bin/|/sbin/|/usr/lib(64)?/python[0-9]\.[0-9]"'"), quiet=1))'
if [ $? -ne 0 -a 0$errors_terminate -ne 0 ]; then
	# One or more of the files had a syntax error
	exit 1
fi

# Generate optimized (.pyo) byte-compiled files.
$default_python -O -c 'import compileall, re, sys; sys.exit(not compileall.compile_dir("'"$RPM_BUILD_ROOT"'", '"$depth"', "/", 1, re.compile(r"'"/bin/|/sbin/|/usr/lib(64)?/python[0-9]\.[0-9]"'"), quiet=1))' > /dev/null
if [ $? -ne 0 -a 0$errors_terminate -ne 0 ]; then
	# One or more of the files had a syntax error
	exit 1
fi
exit 0

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