122 lines
3.3 KiB
Plaintext
122 lines
3.3 KiB
Plaintext
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#!/usr/bin/env python3
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""" Write out a puppet cosmos-modules.conf """
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import hashlib
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import os
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import os.path
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import sys
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try:
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from configobj import ConfigObj
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OS_INFO = ConfigObj("/etc/os-release")
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except (IOError, ModuleNotFoundError):
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OS_INFO = None
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def get_file_hash(modulesfile):
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"""
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Based on https://github.com/python/cpython/pull/31930: should use
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hashlib.file_digest() but it is only available in python 3.11
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"""
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try:
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with open(modulesfile, "rb") as fileobj:
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digestobj = hashlib.sha256()
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_bufsize = 2**18
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buf = bytearray(_bufsize) # Reusable buffer to reduce allocations.
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view = memoryview(buf)
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while True:
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size = fileobj.readinto(buf)
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if size == 0:
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break # EOF
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digestobj.update(view[:size])
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except FileNotFoundError:
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return ""
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return digestobj.hexdigest()
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def get_list_hash(file_lines):
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"""Get hash of list contents"""
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file_lines_hash = hashlib.sha256()
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for line in file_lines:
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file_lines_hash.update(line)
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return file_lines_hash.hexdigest()
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def create_file_content(modules):
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"""
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Write out the expected file contents to a list so we can check the
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expected checksum before writing anything
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"""
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file_lines = []
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file_lines.append(
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"# Generated by {}\n".format( # pylint: disable=consider-using-f-string
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os.path.basename(sys.argv[0])
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).encode("utf-8")
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)
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for key in modules:
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file_lines.append(
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"{0:11} {1} {2} {3}\n".format( # pylint: disable=consider-using-f-string
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key,
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modules[key]["repo"],
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modules[key]["upgrade"],
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modules[key]["tag"],
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).encode("utf-8")
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)
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return file_lines
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def main():
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"""Starting point of the program"""
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modulesfile: str = "/etc/puppet/cosmos-modules.conf"
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modulesfile_tmp: str = modulesfile + ".tmp"
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modules: dict = {
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"sunet": {
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"repo": "https://github.com/SUNET/puppet-sunet.git",
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"upgrade": "yes",
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"tag": "stable-2*",
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},
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"nagioscfg": {
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"repo": "https://github.com/SUNET/puppet-nagioscfg.git",
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"upgrade": "yes",
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"tag": "sunet-2*",
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},
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}
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# When/if we want we can do stuff to modules here
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if OS_INFO:
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if OS_INFO["VERSION_CODENAME"] == "bullseye":
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pass
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# Build list of expected file content
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file_lines = create_file_content(modules)
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# Get hash of the list
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list_hash = get_list_hash(file_lines)
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# Get hash of the existing file on disk
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file_hash = get_file_hash(modulesfile)
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# Update the file if necessary
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if list_hash != file_hash:
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# Since we are reading the file with 'rb' when computing our hash use 'wb' when
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# writing so we dont end up creating a file that does not match the
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# expected hash
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with open(modulesfile_tmp, "wb") as fileobj:
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for line in file_lines:
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fileobj.write(line)
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# Rename it in place so the update is atomic for anything else trying to
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# read the file
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os.rename(modulesfile_tmp, modulesfile)
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if __name__ == "__main__":
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main()
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