cloud-init package: write-mime-multipart with SyntaxWarning

[Anna Gabriela Teixeira Araujo]

When typing the command:

$ write-mime-multipart --output=combined-userdata.txt \
   my-boothook.txt:text/cloud-boothook \
   my-include.txt:text/x-include-url \
   my-upstart-job.txt:text/upstart-job \
   my-user-script.txt:text/x-shellscript \
   my-cloudconfig.txt

The file output works correctly, but the message below comes as output too:
"/usr/bin/write-mime-multipart:104: SyntaxWarning: "is" with a literal. Did you mean "=="?
  if options.output is "-":"

On the line 104 of the script located in /usr/bin/write-mime-multipart, I just changed:

104 if options.output is "-":
105 if hasattr(sys.stdout, "buffer"):

To:

104 if options.output == "-":
105 if hasattr(sys.stdout, "buffer"):

So, the message stops to pop up after running the command.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[James Falcon (falcojr)]

write-mime-multipart hasn't been part of cloud-init since 0.5.15, which is no longer supported anywhere. It was since moved to the cloud-utils package where it has already been fixed upstream but has not been SRUed to supported Ubuntu releases.

[James Falcon (falcojr)]

This was fixed in upstream cloud-utils version 0.32. It is available in Ubuntu 21.10 and later.