Reported container image size on UI seems incorrect

[wxiaoguang]

Description

A report from Discord channel, thanks to Fascinated.

Container registry works perfectly fine but the size of the images always shows as 856 B
Same size on 2 different packages

Gitea Version

1.19.0

[KN4CK3R]

The size is correct. The image is a manifest list ("there are architectures x and y, choose one") and this list is just a small json document. The real images use more space.
Docker Hub does not show the size of a manifest list ("latest" in this case) but shows the size for every architecture:

Gitea displays only the available architectures but without size.

So a simple solution would be to hide the size if an image is a manifest list to not confuse a viewer.

[wxiaoguang]

Is it possible to show the real size of the real image? If it's too difficult, hiding the unrelated "size" also seems good enough.

[yp05327]

IMO the size in Details means the size of used local disk space.
Maybe we can add the size for each architecture in the list.

[Zettat123]

Is it possible to show the real size of the real image?

I think yes. We can read the layers from the manifest.json of each architecture and then add up the size of each layer to get the real size of the image.

[KN4CK3R]

I have changed the display of architectures:

Will push the changes later.

[RealFascinated]

the hope was that the size in the details would be the total size of everything in the package

[KN4CK3R]

That would not be correct.

[RealFascinated]

awesome, thanks :)