1 # SPDX-License-Identifier: GPL-2.0
2 # Copyright (C) 2020 Bootlin
3 # Author: Joao Marcos Costa <joaomarcos.costa@bootlin.com>
10 def sqfs_get_random_letters(size):
12 for i in range(0, size):
13 letters.append(random.choice(string.ascii_letters))
15 return ''.join(letters)
17 def sqfs_generate_file(path, size):
18 content = sqfs_get_random_letters(size)
19 file = open(path, "w")
24 def __init__(self, name, files, sizes, block_size = 4096):
28 self.mksquashfs_opts = " -b " + str(block_size) + " -comp " + self.name
30 def add_opt(self, opt):
31 self.mksquashfs_opts += " " + opt
33 def gen_image(self, build_dir):
34 src = os.path.join(build_dir, "sqfs_src/")
36 for (f, s) in zip(self.files, self.sizes):
37 sqfs_generate_file(src + f, s)
39 # the symbolic link always targets the first file
40 os.symlink(self.files[0], src + "sym")
42 sqfs_img = os.path.join(build_dir, "sqfs-" + self.name)
43 i_o = src + " " + sqfs_img
44 opts = self.mksquashfs_opts
46 subprocess.run(["mksquashfs " + i_o + opts], shell = True, check = True)
48 print("mksquashfs error. Compression type: " + self.name)
51 def clean_source(self, build_dir):
52 src = os.path.join(build_dir, "sqfs_src/")
55 os.remove(src + "sym")
58 def cleanup(self, build_dir):
59 self.clean_source(build_dir)
60 sqfs_img = os.path.join(build_dir, "sqfs-" + self.name)
63 files = ["blks_only", "blks_frag", "frag_only"]
64 sizes = [4096, 5100, 100]
65 gzip = Compression("gzip", files, sizes)
66 zstd = Compression("zstd", files, sizes)
67 lzo = Compression("lzo", files, sizes)
69 # use fragment blocks for files larger than block_size
70 gzip.add_opt("-always-use-fragments")
71 zstd.add_opt("-always-use-fragments")
73 # avoid fragments if lzo is used
74 lzo.add_opt("-no-fragments")
76 comp_opts = [gzip, zstd, lzo]