[Bug 1821261] Re: nfsiostat broken and exits with traceback

[Eric Desrochers]

Sponsored for B & C release. They are both wainting in their respective
upload queues for approval by the SRU team to start building in their
respective -proposed pockets.

- Eric

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Title:
  nfsiostat broken and exits with traceback

Status in nfs-utils package in Ubuntu:
  Fix Released
Status in nfs-utils source package in Bionic:
  In Progress
Status in nfs-utils source package in Cosmic:
  In Progress
Status in nfs-utils source package in Disco:
  Fix Released

Bug description:
  [Impact]

   * nfsiostat, in nfs-common-1.3.4-2, is broken in bionic, cosmic and
  disco.

   * nfsiostat will not run at all, and is unusuable when users run the
  command. Users should be able to run the command and see output of
  their nfs mounts.

   * The bug is caused by the 'list' reserved word being used as a
  variable name in list_nfs_mounts(), and is explained here:
  https://askubuntu.com/questions/1123319/nfsiostat-failing-
  on-18-04/1123336#1123336?s=a1e9150fbf284e849efe6fe084e7c7b8

  [Test Case]

  * When you run the command nfsiostat, either as root or a regular
  user, the following traceback is printed:

  $ nfsiostat
  Traceback (most recent call last):
    File "/usr/sbin/nfsiostat", line 640, in <module>
      iostat_command(prog)
    File "/usr/sbin/nfsiostat", line 593, in iostat_command
      devices = list_nfs_mounts(origdevices, mountstats)
    File "/usr/sbin/nfsiostat", line 495, in list_nfs_mounts
      for device, descr in list(mountstats.items()):
  TypeError: 'list' object is not callable

  * Instead, the correct behaviour is not crash, and do something like
  the following on a system with no current nfs mounts:

  $ nfsiostat
  No NFS mount points were found

  [Regression Potential]

   * There is only one file modified, which is the nfsiostat python
  script. There is no other changes to any other executable in the
  package. Since nfsiostat was in complete failure before, the fix makes
  it work again, there should not be any cause for concern regarding
  regressions.

   * In the event of a regression, worst case scenario is that users are
  impacted in getting the status of their nfs mounts, while still being
  able to freely mount and use such devices, since they are handled by
  other packages.

   * I have built and tested all versions of packages in a ppa, which you can find here:
   https://launchpad.net/~mruffell/+archive/ubuntu/nfs-utils-testing

  [Other Info]

   * The impacted code is present in xenial and trusty, since it was
  merged into upstream in 2009. However, due to how the function works,
  the program executes fine and does not crash.

  * Upstream commit:
  http://git.linux-nfs.org/?p=steved/nfs-utils.git;a=commitdiff;h=c4c14011b70375050d7bba7c57e2eaf4c715dc7c

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