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# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2020 Bootlin
# Author: Joao Marcos Costa <joaomarcos.costa@bootlin.com>
import os
import random
import string
import subprocess
def sqfs_get_random_letters(size):
letters = []
for i in range(0, size):
letters.append(random.choice(string.ascii_letters))
return ''.join(letters)
def sqfs_generate_file(path, size):
content = sqfs_get_random_letters(size)
file = open(path, "w")
file.write(content)
file.close()
class Compression:
def __init__(self, name, files, sizes, block_size = 4096):
self.name = name
self.files = files
self.sizes = sizes
self.mksquashfs_opts = " -b " + str(block_size) + " -comp " + self.name
def add_opt(self, opt):
self.mksquashfs_opts += " " + opt
def gen_image(self, build_dir):
src = os.path.join(build_dir, "sqfs_src/")
os.mkdir(src)
for (f, s) in zip(self.files, self.sizes):
sqfs_generate_file(src + f, s)
# the symbolic link always targets the first file
os.symlink(self.files[0], src + "sym")
sqfs_img = os.path.join(build_dir, "sqfs-" + self.name)
i_o = src + " " + sqfs_img
opts = self.mksquashfs_opts
try:
subprocess.run(["mksquashfs " + i_o + opts], shell = True, check = True)
except:
print("mksquashfs error. Compression type: " + self.name)
raise RuntimeError
def clean_source(self, build_dir):
src = os.path.join(build_dir, "sqfs_src/")
for f in self.files:
os.remove(src + f)
os.remove(src + "sym")
os.rmdir(src)
def cleanup(self, build_dir):
self.clean_source(build_dir)
sqfs_img = os.path.join(build_dir, "sqfs-" + self.name)
os.remove(sqfs_img)
files = ["blks_only", "blks_frag", "frag_only"]
sizes = [4096, 5100, 100]
gzip = Compression("gzip", files, sizes)
zstd = Compression("zstd", files, sizes)
lzo = Compression("lzo", files, sizes)
# use fragment blocks for files larger than block_size
gzip.add_opt("-always-use-fragments")
zstd.add_opt("-always-use-fragments")
# avoid fragments if lzo is used
lzo.add_opt("-no-fragments")
comp_opts = [gzip, zstd, lzo]
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