"write() argument must be str, not bytes" error when saving file to stdout

[Victor Engmark]

`openstack object save my_container_name my_file.sql.gz` works fine - it saves my_file.gz to the current directory. However, for efficiency reasons I want to stream the file into a program and not save it locally. As a starting point I've tried to run `openstack object save --file - my_container_name my_file.sql.gz | gunzip` as described by `openstack object save --help`, but it fails with the error message "write() argument must be str, not bytes".

Stack trace from running with `--debug`:

write() argument must be str, not bytes
Traceback (most recent call last):
  File "/vagrant/.venv/lib/python3.6/site-packages/cliff/app.py", line 400, in run_subcommand
    result = cmd.run(parsed_args)
  File "/vagrant/.venv/lib/python3.6/site-packages/osc_lib/command/command.py", line 41, in run
    return super(Command, self).run(parsed_args)
  File "/vagrant/.venv/lib/python3.6/site-packages/cliff/command.py", line 184, in run
    return_code = self.take_action(parsed_args) or 0
  File "/vagrant/.venv/lib/python3.6/site-packages/openstackclient/object/v1/object.py", line 226, in take_action
    file=parsed_args.file,
  File "/vagrant/.venv/lib/python3.6/site-packages/openstackclient/api/object_store_v1.py", line 382, in object_save
    sys.stdout.write(chunk)
TypeError: write() argument must be str, not bytes
clean_up SaveObject: write() argument must be str, not bytes
Traceback (most recent call last):
  File "/vagrant/.venv/lib/python3.6/site-packages/osc_lib/shell.py", line 134, in run
    ret_val = super(OpenStackShell, self).run(argv)
  File "/vagrant/.venv/lib/python3.6/site-packages/cliff/app.py", line 279, in run
    result = self.run_subcommand(remainder)
  File "/vagrant/.venv/lib/python3.6/site-packages/osc_lib/shell.py", line 169, in run_subcommand
    ret_value = super(OpenStackShell, self).run_subcommand(argv)
  File "/vagrant/.venv/lib/python3.6/site-packages/cliff/app.py", line 400, in run_subcommand
    result = cmd.run(parsed_args)
  File "/vagrant/.venv/lib/python3.6/site-packages/osc_lib/command/command.py", line 41, in run
    return super(Command, self).run(parsed_args)
  File "/vagrant/.venv/lib/python3.6/site-packages/cliff/command.py", line 184, in run
    return_code = self.take_action(parsed_args) or 0
  File "/vagrant/.venv/lib/python3.6/site-packages/openstackclient/object/v1/object.py", line 226, in take_action
    file=parsed_args.file,
  File "/vagrant/.venv/lib/python3.6/site-packages/openstackclient/api/object_store_v1.py", line 382, in object_save
    sys.stdout.write(chunk)
TypeError: write() argument must be str, not bytes

Setup:

$ python --version
Python 3.6.5
$ openstack --version
openstack 3.15.0
$ uname --kernel-name --kernel-release --kernel-version --machine --processor --hardware-platform --operating-system
Linux 4.15.0-22-generic #24-Ubuntu SMP Wed May 16 12:15:17 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
$ cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=18.04
DISTRIB_CODENAME=bionic
DISTRIB_DESCRIPTION="Ubuntu 18.04 LTS"

[Tim Burke (1-tim-z)]

Submitted https://review.openstack.org/#/c/573465/ to fix it, FWIW, but that was months ago.

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/python-openstackclient 3.19.0 release.

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/python-openstackclient queens-eol release.

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/python-openstackclient rocky-eol release.

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/python-openstackclient stein-eol release.