config.py

Sat, 27 Jan 2018 12:19:39 +0000

author
Tuomo Valkonen <tuomov@iki.fi>
date
Sat, 27 Jan 2018 12:19:39 +0000
changeset 75
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parent 74
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child 79
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permissions
-rw-r--r--

UI refresh fix; added debug messages

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 borgend
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14
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15 logger=borgend.logger.getChild(__name__)
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16
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17 #
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18 # Defaults
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19 #
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20
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21 defaults={
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22 # borg
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23 # Default: backup every 6 hours (21600 seconds)
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24 'backup_interval': 21600,
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25 # Default: retry every 15 minutes if unable to connect / unfinished backup
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26 'retry_interval': 900,
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27 # Extract passphrases at startup or on demand?
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28 'extract_passphrases_at_startup': True,
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29 # Do not insert a quit menu entry (useful for installing on computers of
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30 # inexperienced users)
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31 'no_quit_menu_entry': False,
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32 # Borg settings
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33 'borg': {
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34 'executable': 'borg',
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35 'common_parameters': [],
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36 'create_parameters': [],
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37 'prune_parameters': [],
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38 }
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39 }
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40
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41 #
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42 # Locations
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43 #
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44
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45 if platform.system()!='Darwin':
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46 import xdg
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47 cfgfile=os.path.join(xdg.XDG_CONFIG_HOME, borgend.appname, "config.yaml")
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48 logs_dir=os.path.join(xdg.XDG_DATA_HOME, borgend.appname, "logs")
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49 else:
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50 import rumps
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51 __base=rumps.application_support(borgend.appname)
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52 cfgfile=os.path.join(__base, "config.yaml")
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53 logs_dir=os.path.join(__base, "logs")
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54
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55 #
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56 # Type checking etc.
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57 #
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58
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59 def error(x):
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60 raise AssertionError(x)
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61
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62 def check_field(cfg, field, descr, loc, default, check):
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63 if field in cfg:
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64 tmp=cfg[field]
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65 if not check(tmp):
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66 error("%s is of invalid type for %s" % (field, loc))
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67 return tmp
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68 else:
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69 if default is not None:
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70 return default
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71 else:
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72 error("%s is not configured for %s" % (field, loc))
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73
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74 def check_bool(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, bool))
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77
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78 def check_string(cfg, field, descr, loc, default=None):
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79 return check_field(cfg, field, descr, loc, default,
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80 lambda x: isinstance(x, str))
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81
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82 def check_dict(cfg, field, descr, loc, default=None):
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83 return check_field(cfg, field, descr, loc, default,
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84 lambda x: isinstance(x, dict))
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85
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86 def check_list(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: isinstance(x, list))
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89
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90 def is_list_of(x, chk):
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91 if x is None:
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92 return True
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93 elif isinstance(x, list):
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94 return reduce(lambda y, z: y and chk(z), x, True)
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95 else:
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96 return False
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97
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98 def check_list_of_dicts(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: is_list_of(x, lambda z: isinstance(z, dict)))
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101
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102 def check_list_of_strings(cfg, field, descr, loc, default=None):
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103 return check_field(cfg, field, descr, loc, default,
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104 lambda x: is_list_of(x, lambda z: isinstance(z, str)))
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105
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106 def check_nonempty_list_of_strings(cfg, field, descr, loc):
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107 return check_list_of_strings(cfg, field, descr, loc) and cfg[field]
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108
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109
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110 def check_nonneg_int(cfg, field, descr, loc, default=None):
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111 return check_field(cfg, field, descr, loc, default,
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112 lambda x: isinstance(x, int) and x>=0)
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113
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114
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115 #
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116 # Borg command line parameter configuration helper routines and classes
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117 #
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118
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119 class BorgParameters:
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120 def __init__(self, common, create, prune):
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121 self.common=common or []
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122 self.create=create or []
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123 self.prune=prune or []
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124
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125 def from_config(cfg, loc):
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126 common=check_list_of_dicts(cfg, 'common_parameters',
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127 'Borg parameters', loc, default=[])
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128
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129 create=check_list_of_dicts(cfg, 'create_parameters',
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130 'Create parameters', loc, default=[])
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131
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132 prune=check_list_of_dicts(cfg, 'prune_parameters',
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133 'Prune parameters', loc, default=[])
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134
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135 return BorgParameters(common, create, prune)
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136
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137 def __add__(self, other):
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138 common=self.common+other.common
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139 create=self.create+other.create
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140 prune=self.prune+other.prune
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141 return BorgParameters(common, create, prune)
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142
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143 #
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144 # Load config on module load
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145 #
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146
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147 def expand_env(cfg, env):
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148 if isinstance(cfg, dict):
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149 out={key: expand_env(val, env) for key, val in cfg.items()}
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150 elif isinstance(cfg, list):
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151 out=[expand_env(val, env) for val in cfg]
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152 elif isinstance(cfg, str):
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153 out=string.Template(cfg).substitute(os.environ)
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154 else:
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155 out=cfg
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157 return out
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159 if not (os.path.exists(cfgfile) and os.path.isfile(cfgfile)):
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160 raise SystemExit("Configuration file required: %s" % cfgfile)
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161
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162 logger.info("Reading configuration %s missing" % cfgfile)
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163
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164 with io.open(cfgfile, 'r') as file:
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165 settings=expand_env(yaml.load(file), os.environ);
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166
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167 #
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168 # Verify basic settings
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169 #
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170
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171 def check_and_set(cfg, field, loc, defa, fn):
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172 cfg[field]=fn(cfg, field, field, loc, defa[field])
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173
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174 check_and_set(settings, 'backup_interval', 'top-level', defaults, check_nonneg_int)
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175 check_and_set(settings, 'retry_interval', 'top-level', defaults, check_nonneg_int)
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176 check_and_set(settings, 'extract_passphrases_at_startup', 'top-level', defaults, check_nonneg_int)
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177 check_and_set(settings, 'no_quit_menu_entry', 'top-level', defaults, check_bool)
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178 check_and_set(settings, 'borg', 'top-level', defaults, check_dict)
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179 # Check parameters within 'borg'
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180 if True:
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181 check_and_set(settings['borg'], 'executable', 'borg',
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182 defaults['borg'], check_string)
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183
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184 borg_parameters=BorgParameters.from_config(settings['borg'], "top-level")
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185

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