/usr/lib/python3/dist-packages/simple_cdd/utils.py is in python3-simple-cdd 0.6.5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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from debian import deb822
import subprocess
import fcntl
import select
import shlex
import re
import hashlib
import os
import logging
import shutil
import sys
log = logging.getLogger()
if hasattr(shlex, "quote"):
shell_quote = shlex.quote
else:
import pipes
shell_quote = pipes.quote
if hasattr(shutil, "which"):
shell_which = shutil.which
else:
# Available since python 1.6:
# http://stackoverflow.com/questions/377017/test-if-executable-exists-in-python
from distutils.spawn import find_executable
shell_which = find_executable
def stream_output(proc):
"""
Take a subprocess.Popen object and generate its output, line by line,
annotated with "stdout" or "stderr". At process termination it generates
one last element: ("result", return_code) with the return code of the
process.
"""
fds = [proc.stdout, proc.stderr]
bufs = [b"", b""]
types = ["stdout", "stderr"]
# Set both pipes as non-blocking
for fd in fds:
fcntl.fcntl(fd, fcntl.F_SETFL, os.O_NONBLOCK)
# Multiplex stdout and stderr with different prefixes
while len(fds) > 0:
s = select.select(fds, (), ())
for fd in s[0]:
idx = fds.index(fd)
buf = fd.read()
if len(buf) == 0:
fds.pop(idx)
if len(bufs[idx]) != 0:
yield types[idx], bufs.pop(idx)
types.pop(idx)
else:
bufs[idx] += buf
lines = bufs[idx].split(b"\n")
bufs[idx] = lines.pop()
for l in lines:
yield types[idx], l
res = proc.wait()
yield "result", res
def run_command(name, cmd, env=None, logfd=None):
"""
Run a command logging its output.
name is the name used to identify the command in logs
cmd is the command itself
env is the environment to run the command in. If missing, the current
environment is used.
logfd, if present, is a file where the full output of the command will also
be written.
"""
quoted_cmd = " ".join(shell_quote(x) for x in cmd)
log.debug("%s running command %s", name, quoted_cmd)
if logfd: print("runcmd:", quoted_cmd, file=logfd)
# Run the script itself on an empty environment, so that what was
# documented is exactly what was run
proc = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, env=env)
stderr = []
for type, val in stream_output(proc):
if type == "stdout":
val = val.decode("utf-8").rstrip()
if logfd: print("stdout:", val, file=logfd)
log.debug("%s stdout: %s", name, val)
elif type == "stderr":
val = val.decode("utf-8").rstrip()
if logfd: print("stderr:", val, file=logfd)
if val: stderr.append(val)
log.debug("%s stderr: %s", name, val)
elif type == "result":
if logfd: print("retval:", val, file=logfd)
log.debug("%s retval: %d", name, val)
retval = val
if retval != 0:
lastlines = min(len(stderr), 5)
log.error("%s exited with code %s", name, retval)
log.error("Last %d lines of standard error:", lastlines)
for line in stderr[-lastlines:]:
log.error("%s: %s", name, line)
return retval
def verify_preseed_file(pathname):
"""
Verify that a preseed file is valid.
Returns true if it is valid, false otherwise.
"""
# # verify that preseeding files are valid
proc = subprocess.Popen(["/usr/bin/debconf-set-selections", "--checkonly", pathname],
stdout=subprocess.PIPE, stderr=subprocess.PIPE)
res = None
re_ignore_stderr = re.compile(r'debconf: DbDriver "passwords" warning: could not open /var/cache/debconf/passwords.dat: Permission denied')
for type, val in stream_output(proc):
if type == "stdout":
pass
elif type == "stderr":
val = val.decode("utf-8")
if not re_ignore_stderr.match(val):
print(val, file=sys.stderr)
elif type == "result":
res = val
return res == 0
def list_debs(file_or_dir):
"""
Generated all .deb or .udeb files recursively found inside the given
directories.
If an argument is a file, and is a .deb or .udeb, it is also generated
"""
wanted = re.compile(r".*\.(deb|udeb)$")
if os.path.isfile(file_or_dir):
if wanted.search(file_or_dir):
yield file_or_dir
elif os.path.isdir(file_or_dir):
for root, dirs, files in os.walk(file_or_dir):
for f in files:
if not wanted.search(f): continue
yield os.path.join(root, f)
else:
log.warn("local package source %s is neither a file nor a directory", file_or_dir)
class Checksums:
"""
In-memory database of file checksums
"""
FIELDS = ["MD5Sum", "SHA1", "SHA256"]
def __init__(self):
# dict mapping pathnames to { size: int, MD5Sum: str, SHA1: str, SHA256: str }
#
# Only those checksum fields actually present in the Release file will
# exist. size is also optional.
self.by_relname = {}
# Files that have been parsed to collect checksums
self.sources = []
def verify_file(self, absname, relname):
"""
Verify if a file matches the checksums. Fails if it does not, or if we
do not have a checksum for it.
"""
# Get the checksum record for this file
file_sums = self.by_relname.get(relname, None)
if file_sums is None:
raise Fail("No checksums found for %s in %s", relname, ", ".join(self.sources))
# Check file size if we have it
expected_size = file_sums.get("size", None)
if expected_size is not None:
real_size = os.stat(absname).st_size
if real_size != expected_size:
raise Fail("Invalid size for %s: expected %d, got %d", absname, expected_size, real_size)
# Check the file against the checksums that we have
for hashtype in self.FIELDS:
hashsum = file_sums.get(hashtype, None)
if hashsum is None: continue
# Compute the checksum
if hashtype == "MD5SUM":
hasher = hashlib.md5()
elif hashtype == "SHA256":
hasher = hashlib.sha256()
elif hashtype == "SHA1":
hasher = hashlib.sha1()
else:
continue
with open(absname, "rb") as fd:
hasher.update(fd.read())
# Verify
if hasher.hexdigest() != hashsum:
raise Fail("Invalid checksum for %s: expected %s, got %s", absname, hashsum, hasher.hexdigest())
def parse_release_file(self, pathname):
"""
Add checksums from a Release file
"""
self.sources.append(pathname)
with open(pathname, "rt") as fd:
for rec in deb822.Deb822.iter_paragraphs(fd, fields=self.FIELDS):
for hashname in self.FIELDS:
hashes = rec.get(hashname, None)
if hashes is None: continue
for line in hashes.split("\n"):
line = line.strip()
if not line: continue
hashsum, size, pathname = line.split()
entry = self.by_relname.get(pathname, None)
if entry is None:
self.by_relname[pathname] = { "size": int(size), hashname: hashsum }
else:
entry["size"] = int(size)
entry[hashname] = hashsum
def parse_checksums_file(self, pathname, fieldname):
"""
Add checksums from a md5sum/sha256sum format file
"""
self.sources.append(pathname)
with open(pathname, "rt") as fd:
for line in fd:
hashsum, pathname = line.split()
if pathname.startswith("./"):
pathname = pathname[2:]
entry = self.by_relname.get(pathname, None)
if entry is None:
self.by_relname[pathname] = { fieldname: hashsum }
else:
entry[fieldname] = hashsum
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