updating sysresc relchk
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@ -1,52 +1,219 @@
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#!/usr/bin/env python3
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# TODO: add config file support
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# TODO: logging
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import datetime
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import json
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import hashlib
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import pathlib
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import os
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import re
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import shutil
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import subprocess
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# import subprocess
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##
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import psutil
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import requests
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from lxml import etree
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dest_dir = '/boot/iso'
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dest_file = 'sysresccd.iso'
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ver_file = '.sysresccd.info'
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feed_url = 'https://osdn.net/projects/systemrescuecd/storage/!rss'
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dl_base = ('https://osdn.net/frs/'
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'redir.php?m=constant&f='
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'/storage/g/s/sy/systemrescuecd/releases/{version}/systemrescuecd-{version}.iso')
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old_version = None
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new_version = None
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grub_cfg = '/etc/grub.d/40_custom_sysresccd'
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class Updater(object):
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_fname_re = re.compile(r'^systemrescue-(?P<version>[0-9.]+)-(?P<arch>(i686|amd64)).iso$')
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_def_hash = 'sha256'
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_allowed_hashes = ('sha256', 'sha512')
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_allowed_arches = ('i686', 'amd64')
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_date_fmt = '%a, %d %b %Y %H:%M:%S %z'
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def __init__(self,
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arch = 'amd64',
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dest_dir = '/boot/iso',
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dest_file = 'sysresccd.iso',
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ver_file = '.sysresccd.json',
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lock_path = '/tmp/.sysresccd.lck',
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feed_url = 'https://osdn.net/projects/systemrescuecd/storage/!rss',
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dl_base = 'https://osdn.net/frs/redir.php?m=constant&f=/storage/g/s/sy/systemrescuecd',
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grub_cfg = '/etc/grub.d/40_custom_sysresccd',
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# check_gpg = True, # TODO: GPG sig checking
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hash_type = 'sha512'):
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if arch.lower() not in self._allowed_arches:
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raise ValueError('arch must be one of: {0}'.format(', '.join(self._allowed_arches)))
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else:
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self.arch = arch.lower()
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if hash_type.lower() not in self._allowed_hashes:
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raise ValueError('hash_type must be one of: {0}'.format(', '.join(self._allowed_hashes)))
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else:
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self.hash_type = hash_type.lower()
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self.dest_dir = os.path.abspath(os.path.expanduser(dest_dir))
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self.dest_file = dest_file
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self.ver_file = ver_file
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self.feed_url = feed_url
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self.dl_base = dl_base
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self.grub_cfg = grub_cfg
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self.lckfile = os.path.abspath(os.path.expanduser(lock_path))
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self.hasher = hashlib.new(self.hash_type)
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self.old_date = None
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self.old_ver = None
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self.old_hash = None
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self.new_date = None
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self.new_ver = None
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self.new_hash = None
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self.do_update = False
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self.force_update = False
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self.iso_url = None
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self.dest_iso = os.path.join(self.dest_dir, self.dest_file)
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self.dest_ver = os.path.join(self.dest_dir, self.ver_file)
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self._init_vars()
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def _init_vars(self):
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if self.getRunning():
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return(None)
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self.getCurVer()
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self.getNewVer()
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return(None)
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def main(self):
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if self.getRunning():
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return(None)
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self.lock()
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if self.do_update or \
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self.force_update or not \
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all((self.old_date,
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self.old_ver,
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self.old_hash)):
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self.download()
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self.touchVer()
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self.unlock()
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return(None)
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def download(self):
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if self.getRunning():
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return(None)
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if not any((self.do_update, self.force_update)):
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return(None)
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if not self.iso_url:
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raise RuntimeError('iso_url attribute must be set first')
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req = requests.get(self.iso_url, stream = True)
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if not req.ok:
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raise RuntimeError('Received non-200/30x for {0}'.format(self.iso_url))
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with req as uri:
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with open(self.dest_iso, 'wb') as fh:
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shutil.copyfileobj(uri.raw, fh)
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with open(self.dest_iso, 'rb') as fh:
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self.hasher.update(fh.read())
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self.new_hash = self.hasher.hexdigest().lower()
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self.hasher = hashlib.new(self.hash_type)
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self.updateVer()
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return(None)
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def getCurVer(self):
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if self.getRunning():
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return(None)
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if not os.path.isfile(self.dest_ver):
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self.do_update = True
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self.force_update = True
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self.old_ver = 0.00
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return(None)
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with open(self.dest_ver, 'rb') as fh:
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ver_info = json.load(fh)
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tz_data = datetime.timezone(datetime.timedelta(hours = 0), 'UTC')
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self.old_date = datetime.datetime.fromtimestamp(ver_info['date']).replace(tzinfo = tz_data)
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self.old_ver = ver_info['ver']
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self.old_hash = ver_info.get(self.hash_type, self._def_hash)
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if ver_info.get('arch') != self.arch:
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self.do_update = True
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self.force_update = True
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try:
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with open(self.dest_iso, 'rb') as fh:
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self.hasher.update(fh.read())
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if self.old_hash != self.hasher.hexdigest().lower():
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self.do_update = True
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self.force_update = True
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self.hasher = hashlib.new(self.hash_type)
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except FileNotFoundError:
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return(None)
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return (None)
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def getNewVer(self):
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if self.getRunning():
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return(None)
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req = requests.get(self.feed_url)
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if not req.ok:
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raise RuntimeError('Received non-200/30x for {0}'.format(self.feed_url))
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feed = etree.fromstring(req.content)
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for item in feed.xpath('//item'):
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date_xml = item.find('pubDate')
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title_xml = item.find('title')
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link_xml = item.find('link')
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date = title = link = None
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if date_xml is not None:
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date = datetime.datetime.strptime(date_xml.text, self._date_fmt)
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if title_xml is not None:
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title = title_xml.text
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if link_xml is not None:
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link = link_xml.text
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fname_r = self._fname_re.search(os.path.basename(title))
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if not fname_r:
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continue
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ver_info = fname_r.groupdict()
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if ver_info['arch'] != self.arch:
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continue
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new_ver = float(ver_info.get('version', self.old_ver))
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if not all((self.old_ver, self.old_date)) or \
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(new_ver > self.old_ver) or \
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(self.old_date < date):
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self.do_update = True
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self.new_ver = new_ver
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self.new_date = date
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self.iso_url = link
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hash_url = '{0}.{1}'.format(self.iso_url, self.hash_type)
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req = requests.get(hash_url)
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if not req.ok:
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raise RuntimeError('Received non-200/30x for {0}'.format(hash_url))
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self.new_hash = req.content.decode('utf-8').lower()
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return(None)
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def getRunning(self):
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if not os.path.isfile(self.lckfile):
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return(False)
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my_pid = os.getpid()
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with open(self.lckfile, 'r') as fh:
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pid = int(fh.read().strip())
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if not psutil.pid_exists(pid):
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os.remove(self.lckfile)
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return(False)
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if pid == my_pid:
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return(False)
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return(True)
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def lock(self):
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with open(self.lckfile, 'w') as fh:
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fh.write(str(os.getpid()))
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return(None)
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def touchVer(self):
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if self.getRunning():
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return(None)
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ver_path = pathlib.Path(self.dest_ver)
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ver_path.touch(exist_ok = True)
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return(None)
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def unlock(self):
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if os.path.isfile(self.lckfile):
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os.remove(self.lckfile)
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return(None)
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def updateVer(self):
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if self.getRunning():
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return(None)
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d = {'date': self.new_date.timestamp(),
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'arch': self.arch,
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'ver': self.new_ver,
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self.hash_type: self.new_hash}
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with open(os.path.join(self.dest_dir, self.ver_file), 'w') as fh:
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fh.write(json.dumps(d, indent = 4))
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fh.write('\n')
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return(None)
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def downloadISO(url, version):
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dest = os.path.join(dest_dir, dest_file)
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destver = os.path.join(dest_dir, ver_file)
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with requests.get(url, stream = True) as url:
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with open(dest, 'wb') as fh:
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shutil.copyfileobj(url.raw, fh)
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with open(destver, 'w') as fh:
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fh.write(version.strip())
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return()
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if os.path.isfile(os.path.join(dest_dir, ver_file)):
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with open(os.path.join(dest_dir, ver_file), 'r') as f:
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old_version = f.read().strip()
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r = requests.get(feed_url)
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if not r.ok:
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raise RuntimeError('Could not fetch feed from {0}'.format(feed_url))
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feed = etree.fromstring(r.content)
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latest = feed.xpath('//item')[0]
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raw_version = os.path.basename(latest.find('title').text.strip())
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new_version = re.sub(r'^systemrescuecd-(x86-)?(?P<version>[0-9.]+).iso',
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r'\g<version>',
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raw_version)
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dl_url = dl_base.format(version = new_version)
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if old_version and old_version != new_version:
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downloadISO(dl_url, new_version)
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elif not old_version:
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downloadISO(dl_url, new_version)
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if __name__ == '__main__':
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u = Updater()
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u.main()
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