[Bug 1528316] Re: pyhton3 flask hangs on file changes using send_from_directory

[Chuck Short]

** Changed in: flask (Ubuntu)
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1528316

Title:
  pyhton3 flask hangs on file changes using send_from_directory

Status in flask package in Ubuntu:
  Fix Released

Bug description:
  I was getting an exception randomly on minetest master-server that I
  traced back to "send_from_directory".  When I searched on the web I
  found the problem was already reported and resolved a few years back.

  Similar Error
  https://github.com/mitsuhiko/flask/issues/1169

  Bug Fix:
  https://github.com/mitsuhiko/flask/pull/921

  Please update the package with bug fix reported above.

  Thank you!

  Summary of issue from a user on GitHub:

  welshjf commented on May 1 
  I've hit this problem too; perhaps I can clarify what's going on.
  send_from_directory tests for existence based on the safe_join of directory and filename. So if directory is relative, this is relative to the current working directory of the process -- pretty unreliable. send_file, however, expands relative paths based on current_app.root_path, and does not have any existence check.
  Thus, if the CWD and root_path do not match, send_from_directory may prematurely raise a 404 for files that do exist, or fail to do so for files that happen to exist in the CWD but not the root_path. In the second case, you get a 500 internal error when os.path.getsize or

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: python3-flask (not installed)
  ProcVersionSignature: Ubuntu 3.19.0-25.26~14.04.1-generic 3.19.8-ckt2
  Uname: Linux 3.19.0-25-generic i686
  ApportVersion: 2.14.1-0ubuntu3.19
  Architecture: i386
  Date: Mon Dec 21 10:20:51 2015
  InstallationDate: Installed on 2015-12-09 (12 days ago)
  InstallationMedia: Ubuntu-Server 14.04.3 LTS "Trusty Tahr" - Beta i386 (20150805)
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: flask
  UpgradeStatus: No upgrade log present (probably fresh install)

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