303 lines
14 KiB
Python
Executable File
303 lines
14 KiB
Python
Executable File
#!/usr/bin/env python3
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# Thanks to Matt Rude and https://gist.github.com/mattrude/b0ac735d07b0031bb002 so I can know what the hell I'm doing.
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import argparse
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import configparser
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import datetime
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import getpass
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import os
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import subprocess
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from pwd import getpwnam
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from grp import getgrnam
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NOW = datetime.datetime.utcnow()
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NOWstr = NOW.strftime('%Y-%m-%d')
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# TODO:
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# - cleanup/rotation should be optional
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cfgfile = os.path.join(os.environ['HOME'], '.sksdump.ini')
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def getDefaults():
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# Hardcoded defaults
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dflt = {'system': {'user': 'sks',
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'group': 'sks',
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'compress': 'xz',
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'svcs': ['sks-db', 'sks-recon'],
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'logfile': '/var/log/sksdump.log',
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'days': 1,
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'dumpkeys': 15000},
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'paths': {'basedir': '/var/lib/sks',
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'destdir': '/srv/http/sks/dumps',
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'rsync': 'root@mirror.square-r00t.net:/srv/http/sks/dumps'},
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'runtime': {'nodump': None, 'nocompress': None, 'nosync': None}}
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## Build out the default .ini.
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dflt_str = ('# IMPORTANT: This script uses certain permissions functions that require some forethought.\n' +
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'# You can either run as root, which is the "easy" way, OR you can run as the sks user.\n' +
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'# Has to be one or the other; you\'ll SERIOUSLY mess things up otherwise.\n' +
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'# If you run as the sks user, MAKE SURE the following is set in your sudoers\n' +
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'# (where SKSUSER is the username sks runs as):\n#\tCmnd_Alias SKSCMDS = ' +
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'/usr/bin/systemctl start sks-db,\\\n#\t\t/usr/bin/systemctl stop sks-db,\\\n#\t\t' +
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'/usr/bin/systemctl start sks-recon,\\\n#\t\t/usr/bin/systemctl stop sks-recon\n#\t' +
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'SKSUSER ALL = NOPASSWD: SKSCMDS\n\n')
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dflt_str += ('# This was written for systemd systems only. Tweaking would be needed for non-systemd systems\n' +
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'# (since every non-systemd uses their own init system callables...)\n\n')
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# [system]
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d = dflt['system']
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dflt_str += ('## SKSDUMP CONFIG FILE ##\n\n# This section controls various system configuration.\n' +
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'[system]\n# This should be the user SKS runs as.\nuser = {0}\n# This is the group that' +
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'SKS runs as.\ngroup = {1}\n# If None, don\'t compress dumps.\n# If one of: ' +
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'xz, gz, bz2, or lrz (for lrzip) then use that compression algo.\ncompress = {2}\n' +
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'# These services will be started/stopped, in order, before/after dumps. ' +
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'Comma-separated.\nsvcs = {3}\n# The path to the logfile.\nlogfile = {4}\n# The number ' +
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'of days of rotated key dumps. If None, don\'t rotate.\ndays = {5}\n# How many keys to include in each ' +
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'dump file.\ndumpkeys = {6}\n\n').format(d['user'],
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d['group'],
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d['compress'],
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','.join(d['svcs']),
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d['logfile'],
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d['days'],
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d['dumpkeys'])
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# [paths]
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d = dflt['paths']
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dflt_str += ('# This section controls where stuff goes and where we should find it.\n[paths]\n# ' +
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'Where your SKS DB is.\nbasedir = {0}\n# This is the base directory where the dumps should go.\n' +
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'# There will be a sub-directory created for each date.\ndestdir = {1}\n# The ' +
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'path for rsyncing the dumps. If None, don\'t rsync.\nrsync = {2}\n\n').format(d['basedir'],
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d['destdir'],
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d['rsync'])
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# [runtime]
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d = dflt['runtime']
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dflt_str += ('# This section controls runtime options. These can be overridden at the commandline.\n' +
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'# They take no values; they\'re merely options.\n[runtime]\n# Don\'t dump any keys.\n' +
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'# Useful for dedicated in-transit/prep boxes.\n;nodump\n# Don\'t compress the dumps, even if ' +
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'we have a compression scheme specified in [system:compress].\n;nocompress\n# Don\'t sync to' +
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'another server/path, even if one is specified in [paths:rsync].\n;nosync\n')
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realcfg = configparser.ConfigParser(defaults = dflt, allow_no_value = True)
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if not os.path.isfile(cfgfile):
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with open(cfgfile, 'w') as f:
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f.write(dflt_str)
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realcfg.read(cfgfile)
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return(realcfg)
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def svcMgmt(op, args):
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if op not in ('start', 'stop'):
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raise ValueError('Operation must be start or stop')
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for svc in args['svcs'].split(','):
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cmd = ['/usr/bin/systemctl', op, svc.strip()]
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if getpass.getuser() != 'root':
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cmd.insert(0, 'sudo')
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subprocess.run(cmd)
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return()
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def destPrep(args):
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nowdir = os.path.join(args['destdir'], NOWstr)
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curdir = os.path.join(args['destdir'], 'current')
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PAST = NOW - datetime.timedelta(days = args['days'])
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for thisdir, dirs, files in os.walk(args['destdir'], topdown = False):
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for f in files:
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try: # we use a try here because if the link's broken, the script bails out.
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fstat = os.stat(os.path.join(thisdir, f))
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mtime = fstat.st_mtime
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if int(mtime) < PAST.timestamp():
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os.remove(os.path.join(thisdir, f))
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except FileNotFoundError: # broken symlink
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try:
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os.remove(os.path.join(thisdir, f))
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except:
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pass # just... ignore it. it's fine, whatever.
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# Delete if empty dir
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if os.path.isdir(thisdir):
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if len(os.listdir(thisdir)) == 0:
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os.rmdir(thisdir)
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for d in dirs:
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_dir = os.path.join(thisdir, d)
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if os.path.isdir(_dir):
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if len(os.listdir(_dir)) == 0:
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os.rmdir(os.path.join(thisdir, d))
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#try:
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# os.removedirs(sks['destdir']) # Remove empty dirs
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#except:
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# pass # thisisfine.jpg
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os.makedirs(nowdir, exist_ok = True)
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if getpass.getuser() == 'root':
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uid = getpwnam(args['user']).pw_uid
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gid = getgrnam(args['group']).gr_gid
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for d in (args['destdir'], nowdir): # we COULD set it as part of the os.makedirs, but iirc it doesn't set it for existing dirs
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os.chown(d, uid, gid)
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if os.path.isdir(curdir):
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os.remove(curdir)
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os.symlink(NOWstr, curdir, target_is_directory = True)
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return()
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def dumpDB(args):
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destPrep(args)
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os.chdir(args['basedir'])
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svcMgmt('stop', args)
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cmd = ['sks',
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'dump',
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str(args['dumpkeys']), # How many keys per dump?
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os.path.join(args['destdir'], NOWstr), # Where should it go?
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'keydump.{0}'.format(NOWstr)] # What the filename prefix should be
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if getpass.getuser() == 'root':
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cmd2 = ['sudo', '-u', args['user']]
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cmd2.extend(cmd)
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cmd = cmd2
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with open(args['logfile'], 'a') as f:
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f.write('===== {0} =====\n'.format(str(datetime.datetime.utcnow())))
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subprocess.run(cmd, stdout = f, stderr = f)
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svcMgmt('start', args)
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return()
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def compressDB(args):
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if not args['compress']:
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return()
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curdir = os.path.join(args['destdir'], NOWstr)
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for thisdir, dirs, files in os.walk(curdir): # I use os.walk here because we might handle this differently in the future...
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files.sort()
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for f in files:
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fullpath = os.path.join(thisdir, f)
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newfile = '{0}.{1}'.format(fullpath, args['compress'])
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# TODO: add compressed tarball support.
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# However, I can't do this on memory-constrained systems for lrzip.
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# See: https://github.com/kata198/python-lrzip/issues/1
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with open(args['logfile'], 'a') as f:
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f.write('===== {0} Now compressing {1} =====\n'.format(str(datetime.datetime.utcnow()), fullpath))
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if args['compress'].lower() == 'gz':
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import gzip
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with open(fullpath, 'rb') as fh_in, gzip.open(newfile, 'wb') as fh_out:
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fh_out.writelines(fh_in)
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elif args['compress'].lower() == 'xz':
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import lzma
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with open(fullpath, 'rb') as fh_in, lzma.open(newfile, 'wb', preset = 9|lzma.PRESET_EXTREME) as fh_out:
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fh_out.writelines(fh_in)
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elif args['compress'].lower() == 'bz2':
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import bz2
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with open(fullpath, 'rb') as fh_in, bz2.open(newfile, 'wb') as fh_out:
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fh_out.writelines(fh_in)
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elif args['compress'].lower() == 'lrz':
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import lrzip
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with open(fullpath, 'rb') as fh_in, open(newfile, 'wb') as fh_out:
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fh_out.write(lrzip.compress(fh_in.read()))
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os.remove(fullpath)
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if getpass.getuser() == 'root':
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uid = getpwnam(args['user']).pw_uid
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gid = getgrnam(args['group']).gr_gid
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os.chown(newfile, uid, gid)
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return()
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def syncDB(args):
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if not args['rsync']:
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return()
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cmd = ['rsync',
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'-a',
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'--delete',
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os.path.join(args['destdir'], '.'),
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args['rsync']]
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with open(args['logfile'], 'a') as f:
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f.write('===== {0} Rsyncing to mirror =====\n'.format(str(datetime.datetime.utcnow())))
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with open(args['logfile'], 'a') as f:
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subprocess.run(cmd, stdout = f, stderr = f)
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return()
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def parseArgs():
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cfg = getDefaults()
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system = cfg['system']
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paths = cfg['paths']
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runtime = cfg['runtime']
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args = argparse.ArgumentParser(description = 'sksdump - a tool for dumping the SKS Database',
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epilog = 'brent s. || 2017 || https://square-r00t.net')
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args.add_argument('-u',
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'--user',
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default = system['user'],
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dest = 'user',
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help = 'The user that you run SKS services as.')
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args.add_argument('-g',
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'--group',
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default = system['group'],
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dest = 'group',
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help = 'The group that SKS services run as.')
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args.add_argument('-c',
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'--compress',
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default = system['compress'],
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dest = 'compress',
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choices = ['xz', 'gz', 'bz2', 'lrz', None],
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help = 'The compression scheme to apply to the dumps.')
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args.add_argument('-s',
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'--services',
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default = system['svcs'],
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dest = 'svcs',
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help = 'A comma-separated list of services that will be stopped/started for the dump (in the provided order).')
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args.add_argument('-l',
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'--log',
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default = system['logfile'],
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dest = 'logfile',
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help = 'The path to the logfile.')
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args.add_argument('-a',
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'--days',
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default = system['days'],
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dest = 'days',
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type = int,
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help = 'How many days to keep rotation for.')
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args.add_argument('-d',
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'--dumpkeys',
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default = system['dumpkeys'],
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dest = 'dumpkeys',
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type = int,
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help = 'How many keys to put in each dump.')
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args.add_argument('-b',
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'--basedir',
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default = paths['basedir'],
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dest = 'basedir',
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help = 'The directory which holds your SKS DB.')
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args.add_argument('-e',
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'--destdir',
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default = paths['destdir'],
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dest = 'destdir',
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help = 'The directory where the dumps should be saved (a sub-directory with the date will be created).')
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args.add_argument('-r',
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'--rsync',
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default = paths['rsync'],
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dest = 'rsync',
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help = 'The remote (user@host:/path/) or local (/path/) path to use to sync the dumps to.')
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args.add_argument('-D',
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'--no-dump',
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dest = 'nodump',
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action = 'store_true',
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default = ('nodump' in runtime),
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help = 'Don\'t dump the SKS DB (default is to dump)')
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args.add_argument('-C',
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'--no-compress',
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dest = 'nocompress',
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action = 'store_true',
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default = ('nocompress' in runtime),
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help = 'Don\'t compress the DB dumps (default is to compress)')
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args.add_argument('-S',
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'--no-sync',
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dest = 'nosync',
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action = 'store_true',
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default = ('nosync' in runtime),
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help = 'Don\'t sync the dumps to the remote server.')
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varargs = vars(args.parse_args())
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return(varargs)
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def main():
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args = parseArgs()
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if getpass.getuser() not in ('root', args['user']):
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exit('ERROR: You must be root or {0}!'.format(args['user']))
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with open(args['logfile'], 'a') as f:
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f.write('===== {0} STARTING =====\n'.format(str(datetime.datetime.utcnow())))
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if not args['nodump']:
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dumpDB(args)
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if not args['nocompress']:
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compressDB(args)
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if not args['nosync']:
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syncDB(args)
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with open(args['logfile'], 'a') as f:
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f.write('===== {0} DONE =====\n'.format(str(datetime.datetime.utcnow())))
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if __name__ == '__main__':
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main()
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