1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
|
#!/usr/bin/env python3
# SPDX-License-Identifier: LGPL-2.1+
OUTFILE_HEADER = """#!/usr/bin/env python3
# SPDX-License-Identifier: LGPL-2.1+
#
# create-sys-script.py
#
# © 2017 Canonical Ltd.
# Author: Dan Streetman <dan.streetman@canonical.com>
"""
# Use this only to (re-)create the test/sys-script.py script,
# after adding or modifying anything in the test/sys/ directory
import os, sys
import stat
import tempfile
import filecmp
import subprocess
OUTFILE_MODE = 0o775
OUTFILE_FUNCS = r"""
import os, sys
import shutil
def d(path, mode):
os.mkdir(path, mode)
def l(path, src):
os.symlink(src, path)
def f(path, mode, contents):
with open(path, "wb") as f:
f.write(contents)
os.chmod(path, mode)
"""
OUTFILE_MAIN = """
if len(sys.argv) < 2:
exit("Usage: {} <target dir>".format(sys.argv[0]))
if not os.path.isdir(sys.argv[1]):
exit("Target dir {} not found".format(sys.argv[1]))
os.chdir(sys.argv[1])
if os.path.exists('sys'):
shutil.rmtree('sys')
"""
def handle_dir(outfile, path):
m = os.lstat(path).st_mode & 0o777
outfile.write(f"d('{path}', {m:#o})\n")
def handle_link(outfile, path):
src = os.readlink(path)
outfile.write(f"l('{path}', '{src}')\n")
def escape_single_quotes(b):
# remove the b'' wrapping each line repr
r = repr(b)[2:-1]
# python escapes all ' only if there are ' and " in the string
if '"' not in r:
r = r.replace("'", r"\'")
# return line with all ' escaped
return r
def handle_file(outfile, path):
m = os.lstat(path).st_mode & 0o777
with open(path, "rb") as f:
b = f.read()
if b.count(b"\n") > 1:
r = "\n".join( escape_single_quotes(l) for l in b.split(b"\n") )
r = f"b'''{r}'''"
else:
r = repr(b)
outfile.write(f"f('{path}', {m:#o}, {r})\n")
def process_sysdir(outfile):
for (dirpath, dirnames, filenames) in os.walk('sys'):
handle_dir(outfile, dirpath)
for d in dirnames:
path = os.path.join(dirpath, d)
if stat.S_ISLNK(os.lstat(path).st_mode):
handle_link(outfile, path)
for f in filenames:
path = os.path.join(dirpath, f)
mode = os.lstat(path).st_mode
if stat.S_ISLNK(mode):
handle_link(outfile, path)
elif stat.S_ISREG(mode):
handle_file(outfile, path)
def verify_dir(tmpd, path_a):
path_b = os.path.join(tmpd, path_a)
mode_a = os.lstat(path_a).st_mode
mode_b = os.lstat(path_b).st_mode
if not stat.S_ISDIR(mode_b):
raise Exception("Not directory")
if (mode_a & 0o777) != (mode_b & 0o777):
raise Exception("Permissions mismatch")
def verify_link(tmpd, path_a):
path_b = os.path.join(tmpd, path_a)
if not stat.S_ISLNK(os.lstat(path_b).st_mode):
raise Exception("Not symlink")
if os.readlink(path_a) != os.readlink(path_b):
raise Exception("Symlink dest mismatch")
def verify_file(tmpd, path_a):
path_b = os.path.join(tmpd, path_a)
mode_a = os.lstat(path_a).st_mode
mode_b = os.lstat(path_b).st_mode
if not stat.S_ISREG(mode_b):
raise Exception("Not file")
if (mode_a & 0o777) != (mode_b & 0o777):
raise Exception("Permissions mismatch")
if not filecmp.cmp(path_a, path_b, shallow=False):
raise Exception("File contents mismatch")
def verify_script(tmpd):
any = False
for (dirpath, dirnames, filenames) in os.walk("sys"):
any = True
try:
path = dirpath
verify_dir(tmpd, path)
for d in dirnames:
path = os.path.join(dirpath, d)
if stat.S_ISLNK(os.lstat(path).st_mode):
verify_link(tmpd, path)
for f in filenames:
path = os.path.join(dirpath, f)
mode = os.lstat(path).st_mode
if stat.S_ISLNK(mode):
verify_link(tmpd, path)
elif stat.S_ISREG(mode):
verify_file(tmpd, path)
except Exception:
print(f'FAIL on "{path}"', file=sys.stderr)
raise
if not any:
exit('Nothing found!')
if __name__ == "__main__":
if len(sys.argv) < 2:
exit('Usage: create-sys-script.py /path/to/test/')
outfile = os.path.abspath(os.path.dirname(sys.argv[0]) + '/sys-script.py')
print(f'Creating {outfile} using contents of {sys.argv[1]}/sys')
os.chdir(sys.argv[1])
with open(outfile, "w") as f:
os.chmod(outfile, OUTFILE_MODE)
f.write(OUTFILE_HEADER.replace(os.path.basename(sys.argv[0]),
os.path.basename(outfile)))
f.write(OUTFILE_FUNCS)
f.write(OUTFILE_MAIN)
process_sysdir(f)
with tempfile.TemporaryDirectory() as tmpd:
print(f'Recreating sys/ using {outfile} at {tmpd}')
subprocess.check_call([outfile, tmpd])
verify_script(tmpd)
print(f'Verification successful, {outfile} is correct')
|
