#!/bin/bash

errors_terminate=$2

extra=$3

# If using normal root, avoid changing anything.

if [ -z "$RPM_BUILD_ROOT" -o "$RPM_BUILD_ROOT" = "/" ]; 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

# This function now implements Python byte-compilation in two different ways:

# Python >= 3.4 uses a new module compileall2 - https://github.com/fedora-python/compileall2

# Python < 3.4 (inc. Python 2) uses compileall module from stdlib with some hacks

# When we drop support for Python 2, we'd be able to use all compileall2 features like:

# - -s and -p options to manipulate with a path baked into pyc files instead of $real_libdir

# - -o 0 -o 1 to produce multiple files in one run - each with a different optimization level - instead of $options

# - removed useless $depth - both compileall and compileall2 are limited by sys.getrecursionlimit()

# These changes will make this script much simpler

function python_bytecompile()

{

    local options=$1

    local python_binary=$2

    local exclude=$3

    local python_libdir=$4

    local depth=$5 # Not used for Python >= 3.4

    local real_libdir=$6 # Not used for Python >= 3.4

	python_version=$($python_binary -c "import sys; sys.stdout.write('{0.major}{0.minor}'.format(sys.version_info))")

	#

	# Python 3.4 and higher

	#

	if [ "$python_version" -ge 34 ]; then

		[ ! -z $exclude ] && exclude="-x '$exclude'"

		# /usr/lib/rpm/redhat/ contains compileall2 Python module

		# -q disables verbose output

		# -f forces the process to overwrite existing compiled files

		# -x excludes paths defined by regex

		# -e excludes symbolic links pointing outside the build root

		# -x and -e together implements the same functionality as the Filter class below

		# -s strips $RPM_BUILD_ROOT from the path

		# -p prepends the leading slash to the path to make it absolute

		PYTHONPATH=/usr/lib/rpm/redhat/ $python_binary -B $options -m compileall2 -q -f $exclude -s $RPM_BUILD_ROOT -p / -e $RPM_BUILD_ROOT $python_libdir

	else

#

# Python 3.3 and lower (incl. Python 2)

#

cat << EOF | $python_binary $options

import compileall, sys, os, re

python_libdir = "$python_libdir"

depth = $depth

real_libdir = "$real_libdir"

build_root = "$RPM_BUILD_ROOT"

exclude = r"$exclude"

class Filter:

    def search(self, path):

        ret = not os.path.realpath(path).startswith(build_root)

        if exclude:

            ret = ret or re.search(exclude, path)

        return ret

sys.exit(not compileall.compile_dir(python_libdir, depth, real_libdir, force=1, rx=Filter(), quiet=1))

EOF

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 `find "$RPM_BUILD_ROOT" -type d|grep -E "/usr/lib(64)?/python[0-9]\.[0-9]+$"`;

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_bytecompile "" "$python_binary" "" "$python_libdir" "$depth" "$real_libdir"

	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_bytecompile "-O" "$python_binary" "" "$python_libdir" "$depth" "$real_libdir"

	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

# if extra is set to 0, don't do this

if [ 0$extra -eq 0 ]; then

	exit 0

fi

# If we don't have a default python interpreter, we cannot proceed

default_python=${1:-/usr/bin/python}

if [ ! -x "$default_python" ]; then

	exit 0

fi

# Figure out if there are files to be bytecompiled with the default_python at all

# this prevents unnecessary default_python invocation

find "$RPM_BUILD_ROOT" -type f -name "*.py" | grep -Ev "/bin/|/sbin/|/usr/lib(64)?/python[0-9]\.[0-9]|/usr/share/doc" || exit 0

# Generate normal (.pyc) byte-compiled files.

python_bytecompile "" $default_python "/bin/|/sbin/|/usr/lib(64)?/python[0-9]\.[0-9]|/usr/share/doc" "$RPM_BUILD_ROOT" "$depth" "/"

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_bytecompile "-O" $default_python "/bin/|/sbin/|/usr/lib(64)?/python[0-9]\.[0-9]|/usr/share/doc" "$RPM_BUILD_ROOT" "$depth" "/"

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