1# -*- coding: utf-8 -*-
2
3import os
4import sys
5import shutil
6import tarfile
7import urllib2
8import hashlib
9import argparse
10
11EXTERNAL_DIR	= os.path.realpath(os.path.normpath(os.path.dirname(__file__)))
12
13class SourcePackage:
14	def __init__(self, url, filename, checksum, dstDir, postExtract=None):
15		self.url			= url
16		self.filename		= filename
17		self.checksum		= checksum
18		self.dstDir			= dstDir
19		self.postExtract	= postExtract
20
21def computeChecksum (data):
22	return hashlib.sha256(data).hexdigest()
23
24def clean (pkg):
25	srcPath = os.path.join(EXTERNAL_DIR, pkg.dstDir)
26
27	for entry in os.listdir(srcPath):
28		if entry == "CMakeLists.txt":
29			continue
30
31		fullPath = os.path.join(srcPath, entry)
32
33		if os.path.isfile(fullPath):
34			os.unlink(fullPath)
35		elif os.path.isdir(fullPath):
36			shutil.rmtree(fullPath, ignore_errors=False)
37
38def fetch (pkg):
39	print "Fetching %s" % pkg.url
40
41	req			= urllib2.urlopen(pkg.url)
42	data		= req.read()
43	checksum	= computeChecksum(data)
44	dstPath		= os.path.join(EXTERNAL_DIR, pkg.filename)
45
46	if checksum != pkg.checksum:
47		raise Exception("Checksum mismatch for %s, exepected %s, got %s" % (pkg.filename, pkg.checksum, checksum))
48
49	out = open(dstPath, 'wb')
50	out.write(data)
51	out.close()
52
53def extract (pkg):
54	print "Extracting %s to %s" % (pkg.filename, pkg.dstDir)
55
56	srcPath	= os.path.join(EXTERNAL_DIR, pkg.filename)
57	tmpPath	= os.path.join(EXTERNAL_DIR, ".extract-tmp-%s" % pkg.dstDir)
58	dstPath	= os.path.join(EXTERNAL_DIR, pkg.dstDir)
59	archive	= tarfile.open(srcPath)
60
61	if os.path.exists(tmpPath):
62		shutil.rmtree(tmpPath, ignore_errors=False)
63
64	os.mkdir(tmpPath)
65
66	archive.extractall(tmpPath)
67	archive.close()
68
69	extractedEntries = os.listdir(tmpPath)
70	if len(extractedEntries) != 1 or not os.path.isdir(os.path.join(tmpPath, extractedEntries[0])):
71		raise Exception("%s doesn't contain single top-level directory") % pkg.filename
72
73	topLevelPath = os.path.join(tmpPath, extractedEntries[0])
74
75	for entry in os.listdir(topLevelPath):
76		if os.path.exists(os.path.join(dstPath, entry)):
77			print "  skipping %s" % entry
78			continue
79
80		shutil.move(os.path.join(topLevelPath, entry), dstPath)
81
82	shutil.rmtree(tmpPath, ignore_errors=True)
83
84	if pkg.postExtract != None:
85		pkg.postExtract(dstPath)
86
87def postExtractLibpng (path):
88	shutil.copy(os.path.join(path, "scripts", "pnglibconf.h.prebuilt"),
89				os.path.join(path, "pnglibconf.h"))
90
91PACKAGES = [
92	SourcePackage("http://zlib.net/zlib-1.2.8.tar.gz",
93				  "zlib-1.2.8.tar.gz",
94				  "36658cb768a54c1d4dec43c3116c27ed893e88b02ecfcb44f2166f9c0b7f2a0d",
95				  "zlib"),
96	SourcePackage("ftp://ftp.simplesystems.org/pub/libpng/png/src/libpng16/libpng-1.6.17.tar.gz",
97				  "libpng-1.6.17.tar.gz",
98				  "a18233c99e1dc59a256180e6871d9305a42e91b3f98799b3ceb98e87e9ec5e31",
99				  "libpng",
100				  postExtract = postExtractLibpng),
101]
102
103def parseArgs ():
104	parser = argparse.ArgumentParser(description = "Fetch external sources")
105	parser.add_argument('--clean-only', dest='cleanOnly', action='store_true', default=False,
106						help='Clean only, do not fetch/extract')
107	parser.add_argument('--keep-archive', dest='keepArchive', action='store_true', default=False,
108						help='Keep archive after extracting')
109	return parser.parse_args()
110
111if __name__ == "__main__":
112	args = parseArgs()
113
114	for pkg in PACKAGES:
115		clean(pkg)
116
117		if args.cleanOnly:
118			continue
119
120		fetch(pkg)
121		extract(pkg)
122
123		if not args.keepArchive:
124			os.unlink(os.path.join(EXTERNAL_DIR, pkg.filename))
125