Podman 2.0 image load name:tag positional arg is no longer optional

[Musi13]

Is this a BUG REPORT or FEATURE REQUEST? (leave only one on its own line)

/kind bug

Description

Running podman image load [-i image.tar] without specifying the image name produces Error: requires at least 1 arg(s), only received 0. The help string suggests this argument is supposed to be optional (as it was pre-2.0):

# podman image load --help
...
Usage:
  podman image load [flags] [NAME[:TAG]]

Steps to reproduce the issue:

1. podman image load --input image.tar

Describe the results you received:

Error: requires at least 1 arg(s), only received 0

Describe the results you expected:

Getting image source signatures
...
Writing manifest to image destination
Storing signatures
Loaded image(s): ...

Additional information you deem important (e.g. issue happens only occasionally):

Output of podman version:

Version:      2.0.0
API Version:  1
Go Version:   go1.13.8
Built:        Thu Jan  1 00:00:00 1970
OS/Arch:      linux/amd64

Output of podman info --debug:

host:
  arch: amd64
  buildahVersion: 1.15.0
  cgroupVersion: v1
  conmon:
    package: 'conmon: /usr/libexec/podman/conmon'
    path: /usr/libexec/podman/conmon
    version: 'conmon version 2.0.18, commit: '
  cpus: 2
  distribution:
    distribution: ubuntu
    version: "20.04"
  eventLogger: file
  hostname: localhost
  idMappings:
    gidmap: null
    uidmap: null
  kernel: 5.4.0-37-generic
  linkmode: dynamic
  memFree: 6089273344
  memTotal: 8348975104
  ociRuntime:
    name: runc
    package: 'runc: /usr/sbin/runc'
    path: /usr/sbin/runc
    version: 'runc version spec: 1.0.1-dev'
  os: linux
  remoteSocket:
    path: /run/podman/podman.sock
  rootless: false
  slirp4netns:
    executable: ""
    package: ""
    version: ""
  swapFree: 0
  swapTotal: 0
  uptime: 58m 41.13s
registries:
  search:
  - docker.io
  - quay.io
store:
  configFile: /etc/containers/storage.conf
  containerStore:
    number: 0
    paused: 0
    running: 0
    stopped: 0
  graphDriverName: overlay
  graphOptions: {}
  graphRoot: /var/lib/containers/storage
  graphStatus:
    Backing Filesystem: extfs
    Native Overlay Diff: "true"
    Supports d_type: "true"
    Using metacopy: "false"
  imageStore:
    number: 1
  runRoot: /var/run/containers/storage
  volumePath: /var/lib/containers/storage/volumes
version:
  APIVersion: 1
  Built: 0
  BuiltTime: Thu Jan  1 00:00:00 1970
  GitCommit: ""
  GoVersion: go1.13.8
  OsArch: linux/amd64
  Version: 2.0.0

Package info (e.g. output of rpm -q podman or apt list podman):

root:~# apt list podman
Listing... Done
podman/unknown,now 2.0.0~1 amd64 [installed]
podman/unknown 2.0.0~1 arm64
podman/unknown 2.0.0~1 armhf
podman/unknown 2.0.0~1 s390x

Additional environment details (AWS, VirtualBox, physical, etc.):

Verified that this works as expected on 1.9.3:

root:~# dpkg -i podman_1.9.3~1_amd64.deb
dpkg: warning: downgrading podman from 2.0.0~1 to 1.9.3~1
(Reading database ... 41048 files and directories currently installed.)
Preparing to unpack podman_1.9.3~1_amd64.deb ...
Unpacking podman (1.9.3~1) over (2.0.0~1) ...
Setting up podman (1.9.3~1) ...
Processing triggers for man-db (2.9.1-1) ...
root:~# podman image load --input /tmp/image.tar
Getting image source signatures
Copying blob 280440e8f2cd skipped: already exists
...

[vrothberg]

Thanks a lot for the report, @Musi13 !

[vrothberg]

Opened #6722 to fix the issue.