[Bug 1559079] [NEW] swiftclient.service upload leaks filehandles for large files

[Chris Stratford]

Public bug reported:

When uploading large files (i.e. multi-segment ones) using the
swiftclient.service functions, if you pass a file path instead of a file
object it seems to leave the files open after upload.

For example:
tmpfile = "/tmp/wibble"
obj = SwiftUploadObject(tmpfile, object_name=tmpfile)
swift.upload(container="mycontainer", objects=[obj])

After this, lsof shows /tmp/wibble is still open (multiple times)

This approach works around the problem:
with open(tmpfile, "r") as f:
    obj = SwiftUploadObject(f, object_name=tmpfile)
    swift.upload(container=container, objects=[obj]):

While I've seen this on the wily packaged version, it also appears to be
a problem in the upstream (3.0) python module.

$ lsb_release -rd
Description:	Ubuntu 15.10
Release:	15.10

$ apt-cache policy python-swiftclient
python-swiftclient:
  Installed: 1:2.6.0-1ubuntu1
  Candidate: 1:2.6.0-1ubuntu1
  Version table:
 *** 1:2.6.0-1ubuntu1 0
        500 http://gb.archive.ubuntu.com/ubuntu/ wily/main amd64 Packages
        100 /var/lib/dpkg/status

** Affects: python-swiftclient (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1559079

Title:
  swiftclient.service upload leaks filehandles for large files

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