podman inspect --format issues

[EmilienM]

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

/kind bug

Description

The podman inspect command can report empty output while in docker we had something (see example bellow).

Steps to reproduce the issue:

Runs docker inspect --format='{{range .Config.Env}} -e "{{.}}" {{end}} {{range .Mounts}} -v {{.Source}}:{{.Destination}}{{if .Mode}}:{{.Mode}}{{end}}{{end}} -ti {{.Config.Image}}' my_container

Describe the results you received:

Empty result.

Describe the results you expected:
With Docker, we had this output:

-e "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"  -e "container=oci"  -e "KOLLA_BASE_DISTRO=centos"  -e "KOLLA_INSTALL_TYPE=binary"  -e "KOLLA_INSTALL_METATYPE=rhos"  -e "PS1=$(tput bold)(
$(printenv KOLLA_SERVICE_NAME))$(tput sgr0)[$(id -un)@$(hostname -s) $(pwd)]$ "   -ti 127.0.0.1:5000/rhosp15/centos-binary-chrony:9.3.1            

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

Output of podman version:

Version:       1.0.0
Go Version:    go1.10.2
OS/Arch:       linux/amd64

Output of podman info:

host:
  BuildahVersion: 1.6-dev
  Conmon:
    package: podman-1.0.0-1.git82e8011.el7.x86_64
    path: /usr/libexec/podman/conmon
    version: 'conmon version 1.14.0-dev, commit: 635328ab9b2058e40335533f35d595604666f1e4-dirty'
  Distribution:
    distribution: '"centos"'
    version: "7"
  MemFree: 653869056
  MemTotal: 8201072640
  OCIRuntime:
    package: runc-1.0.0-57.dev.git2abd837.el7.centos.x86_64
    path: /usr/bin/runc
    version: 'runc version spec: 1.0.0'
  SwapFree: 2009853952
  SwapTotal: 2147479552
  arch: amd64
  cpus: 4
  hostname: undercloud.localdomain
  kernel: 3.10.0-957.1.3.el7.x86_64
  os: linux
  rootless: false
  uptime: 28m 28.81s
insecure registries:
  registries:
  - 192.168.24.1:8787
  - 192.168.24.3:8787
registries:
  registries:
  - registry.centos.org
  - registry.access.redhat.com
  - docker.io
  - quay.io
store:
  ConfigFile: /etc/containers/storage.conf
  ContainerStore:
    number: 90
  GraphDriverName: overlay
  GraphOptions: null
  GraphRoot: /var/lib/containers/storage
  GraphStatus:
    Backing Filesystem: extfs
    Native Overlay Diff: "true"
    Supports d_type: "true"
  ImageStore:
    number: 37
  RunRoot: /var/run/containers/storage

Additional environment details (AWS, VirtualBox, physical, etc.):
none

[EmilienM]

We're not sure we have this issue all the times, we are still testing it. Just posted for the record for now.

[rhatdan]

@vrothberg Could you check this out.

[baude]

@EmilienM any chance the image type (oci vs docker) could be a variable here?

[EmilienM]

@baude same (docker) images as before.

[vrothberg]

I can reproduce locally and will take a look

[vrothberg]

Podman seems to not like {{if .Mode}}:{{.Mode}}{{end}}

[vrothberg]

The issue is that Podman doesn't fail with invalid keys as Docker does. The format mentioned in this issue doesn't seem to be correct, so nothing will be printed.

Docker will print errors such as Template parsing error: template: :1:20: executing "" at <.GraphDriver.Dta>: map has no entry for key "Dta".

There might be more issues and I will continue digging tomorrow.

[vrothberg]

@EmilienM, #2181 should be a step in the right direction.

[vrothberg]

Docker does not fail as it seems to have .Mode member in the .Mounts struct.