'podman system df' results in Error: invalid reference format

[cmurf]

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

/kind bug

Description

sudo podman system df always reports zero values

Steps to reproduce the issue:

1. load or obtain an image, e.g. podman load -i /tmp/test.tar

2. `sudo podman

Describe the results you received:

$ podman images
REPOSITORY                         TAG     IMAGE ID      CREATED       SIZE
registry.fedoraproject.org/fedora  latest  eb7134a03cd6  2 months ago  208 MB

$ sudo podman system df
TYPE           TOTAL   ACTIVE  SIZE    RECLAIMABLE
Images         0       0       0B      0B (0%)
Containers     0       0       0B      0B (0%)
Local Volumes  0       0       0B      0B (0%)

Describe the results you expected:

Seems like there should be some non-zero values reported for podman system df

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

Output of podman version:

podman-2.1.0-0.85.dev.git0bd5181.fc33.x86_64

Output of podman info --debug:

$ podman version
Version:      2.1.0-dev
API Version:  1
Go Version:   go1.14.4
Built:        Wed Dec 31 17:00:00 1969
OS/Arch:      linux/amd64
[chris@localhost ~]$ podman info --debug
host:
  arch: amd64
  buildahVersion: 1.16.0-dev
  cgroupVersion: v2
  conmon:
    package: conmon-2.0.20-0.1.dev.git3c396d4.fc33.x86_64
    path: /usr/bin/conmon
    version: 'conmon version 2.0.20-dev, commit: fd84f1439b1a7dafedfc2de2072fedac9641f264'
  cpus: 3
  distribution:
    distribution: fedora
    version: "33"
  eventLogger: file
  hostname: localhost.localdomain
  idMappings:
    gidmap:
    - container_id: 0
      host_id: 1000
      size: 1
    - container_id: 1
      host_id: 100000
      size: 65536
    uidmap:
    - container_id: 0
      host_id: 1000
      size: 1
    - container_id: 1
      host_id: 100000
      size: 65536
  kernel: 5.8.0-0.rc5.20200715gite9919e11e219.1.fc33.x86_64
  linkmode: dynamic
  memFree: 1181343744
  memTotal: 3031236608
  ociRuntime:
    name: crun
    package: crun-0.14-1.fc33.x86_64
    path: /usr/bin/crun
    version: |-
      crun version 0.14
      commit: ebc56fc9bcce4b3208bb0079636c80545122bf58
      spec: 1.0.0
      +SYSTEMD +SELINUX +APPARMOR +CAP +SECCOMP +EBPF +YAJL
  os: linux
  remoteSocket:
    path: /run/user/1000/podman/podman.sock
  rootless: true
  slirp4netns:
    executable: /usr/bin/slirp4netns
    package: slirp4netns-1.1.4-2.dev.git4c6befe.fc33.x86_64
    version: |-
      slirp4netns version 1.1.4+dev
      commit: 4c6befe05c3137232cf06a5c2879daf4c20be6b1
      libslirp: 4.3.1
      SLIRP_CONFIG_VERSION_MAX: 3
  swapFree: 1515188224
  swapTotal: 1515188224
  uptime: 4m 24.6s
registries:
  search:
  - registry.fedoraproject.org
  - registry.access.redhat.com
  - registry.centos.org
  - docker.io
store:
  configFile: /home/chris/.config/containers/storage.conf
  containerStore:
    number: 0
    paused: 0
    running: 0
    stopped: 0
  graphDriverName: overlay
  graphOptions:
    overlay.mount_program:
      Executable: /usr/bin/fuse-overlayfs
      Package: fuse-overlayfs-1.1.0-6.dev.git50ab2c2.fc33.x86_64
      Version: |-
        fusermount3 version: 3.9.2
        fuse-overlayfs: version 1.1.0
        FUSE library version 3.9.2
        using FUSE kernel interface version 7.31
  graphRoot: /home/chris/.local/share/containers/storage
  graphStatus:
    Backing Filesystem: xfs
    Native Overlay Diff: "false"
    Supports d_type: "true"
    Using metacopy: "false"
  imageStore:
    number: 1
  runRoot: /run/user/1000/containers
  volumePath: /home/chris/.local/share/containers/storage/volumes
version:
  APIVersion: 1
  Built: 0
  BuiltTime: Wed Dec 31 17:00:00 1969
  GitCommit: ""
  GoVersion: go1.14.4
  OsArch: linux/amd64
  Version: 2.1.0-dev

$

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

podman-2.1.0-0.85.dev.git0bd5181.fc33.x86_64

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

Reproduces on baremetal and VM. Fedora 32 and Rawhide. Btrfs and XFS.

[Luap99]

It looks like you are using rootful and rootless podman here.
If you use podman rootless than you have to use podman system df also as your user and not with sudo.

[cmurf]

What brought me to using sudo is that it doesn't work without it.

$ podman system df
Error: invalid reference format

I get that on a Fedora 32 baremetal and clean installed Fedora 33 VM. But a different F32 baremetal system, it works. I'm not sure what's different among them.

[Luap99]

OK, that is the bug.
I could reproduce this on 2 of my machines. I noticed that the problem only occurs when I had an untagged image on my system.

Can you confirm that you have an untagged image on your system?
run podman images it should contain a line where REPOSITORY and TAG is none like this.

REPOSITORY                       TAG     IMAGE ID      CREATED       SIZE
<none>                           <none>  3a9e1a01ad12  2 months ago  137 MB

[cmurf]

Can you confirm that you have an untagged image on your system?

Confirmed.