updates_automation.py

import os,re,pdb

## Get the repos
path='/var/lib/apt/lists/'
files=os.listdir(path)
release_files=[file for file in files if file.endswith('Release')]

origin_pattern=re.compile('Origin: (.*)\n')
suite_pattern=re.compile('Suite: (.*)\n')

skipped_release_files=[]
repos_to_add=[]
for release_file in release_files:
  with open(path+release_file, 'r') as f:
    read_data = f.read()
    # parse to get origin and suite
    origin_string=re.findall(origin_pattern,read_data)
    suite_string=re.findall(suite_pattern,read_data)
    try:
      repo="\"%s:%s\";" %(origin_string[0].replace(',',r'\,'),
                            suite_string[0].replace(',',r'\,'))

      repos_to_add.append(repo)
    except IndexError:
      skipped_release_files.append(release_file)



## Add the result from repos_to_add in /etc/apt/apt.conf.d/50unattended-upgrades
# checking if not already present

with open('/etc/apt/apt.conf.d/50unattended-upgrades','r') as f:
  read_data=f.read()
  # get everything before first };
  raw_data=re.findall('[.\s\S]*};',read_data)
  repos_already_present=re.findall('".*:.*";',raw_data[0])

repos_to_add=[repo for repo in repos_to_add if repo not in repos_already_present]

print (repos_to_add)
print ("\n\nSkipping files :")
for skipped_release_file in skipped_release_files:
  print (skipped_release_file)