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