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#!/usr/bin/env python3
OUTFILE_HEADER = """#!/usr/bin/env python3
#
# create-sys-script.py
#
# (C) 2017 Canonical Ltd.
# Author: Dan Streetman <dan.streetman@canonical.com>
#
# systemd is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2.1 of the License, or
# (at your option) any later version.
#
# systemd is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with systemd; If not, see <http://www.gnu.org/licenses/>.
#
"""
# 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, stat, tempfile, filecmp
OUTFILE = "sys-script.py"
OUTFILE_MODE = 0o775
OUTFILE_FUNCS = r"""
import os, sys
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])
"""
def handle_dir(outfile, path):
m = os.lstat(path).st_mode & 0o777
outfile.write("d('{}', {:#o})\n".format(path, m))
def handle_link(outfile, path):
src = os.readlink(path)
outfile.write("l('{}', '{}')\n".format(path, src))
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 = "b'''{r}'''".format(r=r)
else:
r = repr(b)
outfile.write("f('{}', {:#o}, {})\n".format(path, m, r))
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):
for (dirpath, dirnames, filenames) in os.walk("sys"):
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("FAIL on '{}'".format(path), file=sys.stderr)
raise
if __name__ == "__main__":
# Always operate in the dir where this script is
os.chdir(os.path.dirname(sys.argv[0]))
if not os.path.isdir("sys"):
exit("No sys/ directory; please create before running this")
print("Creating {} using contents of sys/".format(OUTFILE))
with open(OUTFILE, "w") as f:
os.chmod(OUTFILE, OUTFILE_MODE)
f.write(OUTFILE_HEADER.replace(os.path.basename(sys.argv[0]), OUTFILE))
f.write(OUTFILE_FUNCS)
f.write(OUTFILE_MAIN)
process_sysdir(f)
with tempfile.TemporaryDirectory() as tmpd:
print("Recreating sys/ using {} at {}".format(OUTFILE, tmpd))
os.system("./{script} {tmpd}".format(script=OUTFILE, tmpd=tmpd))
verify_script(tmpd)
print("Verification successful, {} is correct".format(OUTFILE))
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