[tor-bugs] #32527 [Applications/rbm]: rbm downloads 0B sig file if network drops; rejects sig on next run

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#32527: rbm downloads 0B sig file if network drops; rejects sig on next run
------------------------+----------------------------------
 Reporter:  JeremyRand  |          Owner:  boklm
     Type:  defect      |         Status:  new
 Priority:  Medium      |      Component:  Applications/rbm
  Version:              |       Severity:  Normal
 Keywords:              |  Actual Points:
Parent ID:              |         Points:
 Reviewer:              |        Sponsor:
------------------------+----------------------------------
 Instructions to reproduce:

 1. Build Tor Browser via `tor-browser-build`.
 2. Right before rbm tries to download a `.sig` file, shut off the network
 connection.

 Expected results:

 rbm should not write a `.sig` file.  Future invocations of rbm once
 network connection is restored should download the `.sig` file.

 Observed results:

 rbm writes a `.sig` file with size 0B.  When the network connection is
 restored and rbm is run again, rbm does not retry downloading the `.sig`
 file, and instead says something like `Error: File llvm-8.0.0.src.tar.xz
 is not signed with a valid key`.  Manually deleting the 0B `.sig` file
 allows rbm to function properly again.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/32527>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online

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