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Description
openedon Oct 1, 2024
Issue Description
While trying to find a reliable way to compute the disk image size for images and while I found the right approach for docker, I discovered that podman does not support the same option, making harder to keep the build script cross compatible.
To give some insights, the .Size reported by inspect commands is NOT a reliable way to get information about image size because it will report different values for the same image when some layers are shared across multiple images.
We wanted a reliable way to measure the size that does not involve using save to export the image, as that is quite time consuming.
Steps to reproduce the issue
podman system df -v --format "{{ json . }}"
Error: cannot combine --format and --verbose flags
Some command with docker works fine, producing an usable json file.
Describe the results you received
Describe the results you received-
Describe the results you expected
Be able to get a JSON file compatible with the one produced by docker command.
podman info output
host:
arch: arm64
buildahVersion: 1.37.3
cgroupControllers:
- cpu
- io
- memory
- pids
cgroupManager: systemd
cgroupVersion: v2
conmon:
package: conmon-2.1.12-2.fc40.aarch64
path: /usr/bin/conmon
version: 'conmon version 2.1.12, commit: '
cpuUtilization:
idlePercent: 99.63
systemPercent: 0.18
userPercent: 0.19
cpus: 5
databaseBackend: sqlite
distribution:
distribution: fedora
variant: coreos
version: "40"
eventLogger: journald
freeLocks: 2048
hostname: localhost.localdomain
idMappings:
gidmap:
- container_id: 0
host_id: 1000
size: 1
- container_id: 1
host_id: 100000
size: 1000000
uidmap:
- container_id: 0
host_id: 501
size: 1
- container_id: 1
host_id: 100000
size: 1000000
kernel: 6.10.10-200.fc40.aarch64
linkmode: dynamic
logDriver: journald
memFree: 1356480512
memTotal: 4084568064
networkBackend: netavark
networkBackendInfo:
backend: netavark
dns:
package: aardvark-dns-1.12.1-1.20240925084542154505.main.19.g56d105f.fc40.aarch64
path: /usr/libexec/podman/aardvark-dns
version: aardvark-dns 1.13.0-dev
package: netavark-1.12.1-1.20240913132227547291.main.38.gcebebc7.fc40.aarch64
path: /usr/libexec/podman/netavark
version: netavark 1.13.0-dev
ociRuntime:
name: crun
package: crun-1.17-1.20240910121144502937.main.3.g4ab4ac0.fc40.aarch64
path: /usr/bin/crun
version: |-
crun version UNKNOWN
commit: fa61d61334521bb205430e928df99f947716f88c
rundir: /run/user/501/crun
spec: 1.0.0
+SYSTEMD +SELINUX +APPARMOR +CAP +SECCOMP +EBPF +CRIU +LIBKRUN +WASM:wasmedge +YAJL
os: linux
pasta:
executable: /usr/bin/pasta
package: passt-0^20240906.g6b38f07-1.fc40.aarch64
version: |
pasta 0^20240906.g6b38f07-1.fc40.aarch64-pasta
Copyright Red Hat
GNU General Public License, version 2 or later
<https://www.gnu.org/licenses/old-licenses/gpl-2.0.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
remoteSocket:
exists: true
path: /run/user/501/podman/podman.sock
rootlessNetworkCmd: pasta
security:
apparmorEnabled: false
capabilities: CAP_CHOWN,CAP_DAC_OVERRIDE,CAP_FOWNER,CAP_FSETID,CAP_KILL,CAP_NET_BIND_SERVICE,CAP_SETFCAP,CAP_SETGID,CAP_SETPCAP,CAP_SETUID,CAP_SYS_CHROOT
rootless: true
seccompEnabled: true
seccompProfilePath: /usr/share/containers/seccomp.json
selinuxEnabled: true
serviceIsRemote: true
slirp4netns:
executable: /usr/bin/slirp4netns
package: slirp4netns-1.2.2-2.fc40.aarch64
version: |-
slirp4netns version 1.2.2
commit: 0ee2d87523e906518d34a6b423271e4826f71faf
libslirp: 4.7.0
SLIRP_CONFIG_VERSION_MAX: 4
libseccomp: 2.5.5
swapFree: 0
swapTotal: 0
uptime: 75h 35m 25.00s (Approximately 3.12 days)
variant: v8
plugins:
authorization: null
log:
- k8s-file
- none
- passthrough
- journald
network:
- bridge
- macvlan
- ipvlan
volume:
- local
registries:
search:
- docker.io
store:
configFile: /var/home/core/.config/containers/storage.conf
containerStore:
number: 0
paused: 0
running: 0
stopped: 0
graphDriverName: overlay
graphOptions: {}
graphRoot: /var/home/core/.local/share/containers/storage
graphRootAllocated: 106769133568
graphRootUsed: 13714677760
graphStatus:
Backing Filesystem: xfs
Native Overlay Diff: "true"
Supports d_type: "true"
Supports shifting: "false"
Supports volatile: "true"
Using metacopy: "false"
imageCopyTmpDir: /var/tmp
imageStore:
number: 70
runRoot: /run/user/501/containers
transientStore: false
volumePath: /var/home/core/.local/share/containers/storage/volumes
version:
APIVersion: 5.2.3
Built: 1727136000
BuiltTime: Tue Sep 24 01:00:00 2024
GitCommit: ""
GoVersion: go1.22.7
Os: linux
OsArch: linux/arm64
Version: 5.2.3Podman in a container
No
Privileged Or Rootless
None
Upstream Latest Release
Yes
Additional environment details
Additional environment details
Additional information
Practical example for extracting effective image size given an image ID:
$ docker system df -v --format "{{ json .Images }}" | jq -r '.[] | select(.ID == "sha256:6c738f16d08cc1ed35ca4ceb971496ed93c1157c3254866fcdb356ee79154942") | .VirtualSize'
596.1MB
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