Fail hard when update source is unreachable

[mondrake]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.70%. Comparing base (49d60ef) to head (29dc569).
Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master      #97      +/-   ##
============================================
- Coverage     97.70%   97.70%   -0.01%     
  Complexity      220      220              
============================================
  Files             9        9              
  Lines           524      522       -2     
============================================
- Hits            512      510       -2     
  Misses           12       12              

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