config.py

Sun, 28 Jan 2018 11:38:01 +0000

author
Tuomo Valkonen <tuomov@iki.fi>
date
Sun, 28 Jan 2018 11:38:01 +0000
changeset 79
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parent 74
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permissions
-rw-r--r--

Cleaned up module organisation to simplify borgend.py and not have to import it in other modules.

23
86b42610d5a8 #!python3 in script file
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1 #!/usr/local/bin/python3
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2 #
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3 # Borgend configuration loader
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4 #
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5
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6 import yaml
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7 import io
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8 import os
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9 import string
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10 import logging
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11 import platform
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12 from functools import reduce
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13 import loggers
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14 import branding
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15 import locations
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16
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17 logger=loggers.get(__name__)
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18
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19 #
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20 # Defaults
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21 #
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22
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23 defaults={
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24 # borg
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25 # Default: backup every 6 hours (21600 seconds)
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26 'backup_interval': 21600,
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27 # Default: retry every 15 minutes if unable to connect / unfinished backup
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28 'retry_interval': 900,
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29 # Extract passphrases at startup or on demand?
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30 'extract_passphrases_at_startup': True,
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31 # Do not insert a quit menu entry (useful for installing on computers of
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32 # inexperienced users)
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33 'no_quit_menu_entry': False,
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34 # Borg settings
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35 'borg': {
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36 'executable': 'borg',
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37 'common_parameters': [],
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38 'create_parameters': [],
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39 'prune_parameters': [],
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40 }
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41 }
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42
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43 #
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44 # Type checking etc.
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45 #
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46
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47 def error(x):
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48 raise AssertionError(x)
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49
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50 def check_field(cfg, field, descr, loc, default, check):
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51 if field in cfg:
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52 tmp=cfg[field]
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53 if not check(tmp):
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54 error("%s is of invalid type for %s" % (field, loc))
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55 return tmp
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56 else:
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57 if default is not None:
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58 return default
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59 else:
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60 error("%s is not configured for %s" % (field, loc))
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61
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62 def check_bool(cfg, field, descr, loc, default=None):
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63 return check_field(cfg, field, descr, loc, default,
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64 lambda x: isinstance(x, bool))
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65
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66 def check_string(cfg, field, descr, loc, default=None):
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67 return check_field(cfg, field, descr, loc, default,
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68 lambda x: isinstance(x, str))
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69
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70 def check_dict(cfg, field, descr, loc, default=None):
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71 return check_field(cfg, field, descr, loc, default,
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72 lambda x: isinstance(x, dict))
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73
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74 def check_list(cfg, field, descr, loc, default=None):
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75 return check_field(cfg, field, descr, loc, default,
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76 lambda x: isinstance(x, list))
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77
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78 def is_list_of(x, chk):
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79 if x is None:
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80 return True
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81 elif isinstance(x, list):
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82 return reduce(lambda y, z: y and chk(z), x, True)
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83 else:
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84 return False
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85
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86 def check_list_of_dicts(cfg, field, descr, loc, default=None):
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87 return check_field(cfg, field, descr, loc, default,
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88 lambda x: is_list_of(x, lambda z: isinstance(z, dict)))
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89
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90 def check_list_of_strings(cfg, field, descr, loc, default=None):
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91 return check_field(cfg, field, descr, loc, default,
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92 lambda x: is_list_of(x, lambda z: isinstance(z, str)))
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93
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94 def check_nonempty_list_of_strings(cfg, field, descr, loc):
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95 return check_list_of_strings(cfg, field, descr, loc) and cfg[field]
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96
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97
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98 def check_nonneg_int(cfg, field, descr, loc, default=None):
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99 return check_field(cfg, field, descr, loc, default,
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100 lambda x: isinstance(x, int) and x>=0)
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101
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102
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103 #
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104 # Borg command line parameter configuration helper routines and classes
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105 #
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106
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107 class BorgParameters:
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108 def __init__(self, common, create, prune):
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109 self.common=common or []
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110 self.create=create or []
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111 self.prune=prune or []
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112
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113 def from_config(cfg, loc):
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114 common=check_list_of_dicts(cfg, 'common_parameters',
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115 'Borg parameters', loc, default=[])
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116
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117 create=check_list_of_dicts(cfg, 'create_parameters',
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118 'Create parameters', loc, default=[])
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119
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120 prune=check_list_of_dicts(cfg, 'prune_parameters',
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121 'Prune parameters', loc, default=[])
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122
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123 return BorgParameters(common, create, prune)
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124
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125 def __add__(self, other):
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126 common=self.common+other.common
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127 create=self.create+other.create
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128 prune=self.prune+other.prune
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129 return BorgParameters(common, create, prune)
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130
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131 #
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132 # Load config on module load
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133 #
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134
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135 def expand_env(cfg, env):
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136 if isinstance(cfg, dict):
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137 out={key: expand_env(val, env) for key, val in cfg.items()}
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138 elif isinstance(cfg, list):
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139 out=[expand_env(val, env) for val in cfg]
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140 elif isinstance(cfg, str):
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141 out=string.Template(cfg).substitute(os.environ)
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142 else:
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143 out=cfg
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144
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145 return out
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146
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147 if not (os.path.exists(locations.cfgfile) and os.path.isfile(locations.cfgfile)):
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148 raise SystemExit("Configuration file required: %s" % locations.cfgfile)
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149
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150 logger.info("Reading configuration %s missing" % locations.cfgfile)
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151
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152 with io.open(locations.cfgfile, 'r') as file:
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153 settings=expand_env(yaml.load(file), os.environ);
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154
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155 #
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156 # Verify basic settings
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157 #
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158
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159 def check_and_set(cfg, field, loc, defa, fn):
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160 cfg[field]=fn(cfg, field, field, loc, defa[field])
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161
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162 check_and_set(settings, 'backup_interval', 'top-level', defaults, check_nonneg_int)
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163 check_and_set(settings, 'retry_interval', 'top-level', defaults, check_nonneg_int)
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164 check_and_set(settings, 'extract_passphrases_at_startup', 'top-level', defaults, check_nonneg_int)
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165 check_and_set(settings, 'no_quit_menu_entry', 'top-level', defaults, check_bool)
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166 check_and_set(settings, 'borg', 'top-level', defaults, check_dict)
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167 # Check parameters within 'borg'
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168 if True:
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169 check_and_set(settings['borg'], 'executable', 'borg',
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170 defaults['borg'], check_string)
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171
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172 borg_parameters=BorgParameters.from_config(settings['borg'], "top-level")
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