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division by zero in manage.py delete-disconnected-fs-submissions #7201

@cfm

Description

@cfm

Description

On iteration $i$ through the for-loop in securedrop.management.submissions.delete_disconnected_fs_submissions(), bytes_deleted = 0 can cause rate to be set to 0 in—

rate = bytes_deleted / time_elapsed

—leading to a ZeroDivisionError in the next iteration $i + 1$ in:

eta = filesize / rate

Steps to Reproduce

  1. Delete something in /var/lib/securedrop/store
  2. manage.py delete-disconnected-fs-submissions --force

Expected Behavior

Disconnected submissions are deleted.

Actual Behavior

Securely removing file 1/16299 /var/lib/securedrop/store/3ASULFX2WGAMVUXRYL6V2LNP77DA34TUKV4ARDHIU5OUJZQXJKVGL6VLAPGA2BJRGFFZ477RUKJBDIIQGVBGNIGKRGNCZLTIHMKCXCY=/4-stuffed_branch-reply.gpg...
elapsed: 0.06s rate: 0.0 MB/s overall rate: 0.0 MB/s
Traceback (most recent call last):
  File "/var/www/securedrop/manage.py", line 452, in <module>
    _run_from_commandline()
  File "/var/www/securedrop/manage.py", line 442, in _run_from_commandline
    rc = args.func(args)
  File "/var/www/securedrop/management/submissions.py", line 153, in delete_disconnected_fs_submissions
    eta = filesize / rate
ZeroDivisionError: float division by zero

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