[Bug 1762572] Re: regression: sftp method no longer uses temporary file name during upload

[Ubuntu Foundations Team Bug Bot]

The attachment "0001-fix-atomic-upload-regression-for-sftp-method.patch"
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** Tags added: patch

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https://bugs.launchpad.net/bugs/1762572

Title:
  regression: sftp method no longer uses temporary file name during
  upload

Status in dput package in Ubuntu:
  Confirmed

Bug description:
  In previous versions of dput, the sftp method would use a temporary
  file name while uploading. For example:

  linux-headers-4.4.61-20-ev3dev-
  rpi_1~1_armhf.deb.tmp.1492202382.950381994.19485.970636164

  In bionic with package version 1.0.1ubuntu1, it no longer does this.

  I have a remote script that it triggered by a file system watcher that
  looks for the creation of a new .changes file. Since the file is
  created with this line:

  with sftp_client.file(remote_path, "w") as remote_fileobj:

  the initial file is empty and as a result, my script sent me this
  message from reprepro:

  Unexpected empty file 'raspberrypi-firmware_1.20180409-1ev3dev1_armhf.changes'!
  There have been errors!

  This script was working with previous versions of dput.

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