podman history: unexpected (incomplete) results

[edsantiago]

podman history on a newly-committed image does not actually show any previous history, and what it does show looks odd -- "imported from tarball"?

# podman run --name foo fedora date      (unnecessary output excised for readability)
# podman commit foo bar                              [...]
# podman history bar
ID             CREATED          CREATED BY                                      SIZE      COMMENT
b99450604be5   35 seconds ago   /bin/sh -c #(nop) ADD file:3b79c5864268723...   246.1MB   imported from tarball

Compare to docker:

IMAGE               CREATED             CREATED BY                                      SIZE                COMMENT
c4c4eabe5c8b        11 seconds ago      date                                            0 B                 
9110ae7f579f        12 days ago         /bin/sh -c #(nop) ADD file:108805f10df80924ae   235.2 MB            
<missing>           4 months ago        /bin/sh -c #(nop)  ENV DISTTAG=f27container F   0 B                 
<missing>           4 months ago        /bin/sh -c #(nop)  MAINTAINER [Adam Miller <m   0 B                 

Running podman history fedora lists the missing images, although size differs.

[mheon]

Alright, this may be an artifact of how we handle commit - under the covers, we tar up the root filesystem of the container and import that tarball as an image.

We probably should be tarring only the RW layer at top, and importing that as a top layer on top of the existing image. This may require c/storage work?

[rhatdan]

@nalind WDYT?

[baude]

We discussed this on IRC and @TomSweeneyRedHat has agreed to take a look at it based on @nalind 's input which was to use existing buildah code to do this properly.

[TomSweeneyRedHat]

Related to #586