gistfile1.txt

common has 8 layers:

grahamc@Morbo> docker load < /nix/store/2iygj2ykzmsvpp28q8ny9l2gjn511jav-docker-image-common.tar.gz
658eb6718c69: Loading layer  10.24kB/10.24kB
e92a114c41b2: Loading layer  10.24kB/10.24kB
53be5f522b34: Loading layer  122.9kB/122.9kB
f9f68d90f176: Loading layer  5.622MB/5.622MB
55c401b67ff7: Loading layer  409.6kB/409.6kB
0296e7b7d4b7: Loading layer  1.198MB/1.198MB
ffecd238fa95: Loading layer    4.7MB/4.7MB
424ad95540cb: Loading layer  25.57MB/25.57MB
Loaded image: common:2iygj2ykzmsvpp28q8ny9l2gjn511jav

buildImage ignores them all, presumably because they lack a ParentID:

[130] grahamc@Morbo> docker load < /nix/store/h7cx2y2d49llk0d3ymqkxi709gwkifzr-docker-image-full.tar.gz                                  ~
f422afc34bd4: Loading layer  122.9kB/122.9kB
5f59d66c0838: Loading layer  5.581MB/5.581MB
Loaded image: full:h7cx2y2d49llk0d3ymqkxi709gwkifzr

but that is not valid, see Docker's beha1vior:

    FROM common:2iygj2ykzmsvpp28q8ny9l2gjn511jav
    ADD ./Dockerfile /
    
[1] grahamc@Morbo> docker build .
Sending build context to Docker daemon  2.048kB
Step 1/2 : FROM common:2iygj2ykzmsvpp28q8ny9l2gjn511jav
 ---> 22ae6a4907dc
Step 2/2 : ADD ./Dockerfile /
 ---> 091e0b872384
Successfully built 091e0b872384
grahamc@Morbo> docker history 091e0b8
IMAGE               CREATED             CREATED BY                                      SIZE                COMMENT
091e0b872384        9 seconds ago       /bin/sh -c #(nop) ADD file:e025af6a5cc15f2c8…   63B                 
22ae6a4907dc        48 years ago                                                        24.8MB              
<missing>           48 years ago                                                        2.82MB              
<missing>           48 years ago                                                        1.17MB              
<missing>           48 years ago                                                        401kB               
<missing>           48 years ago                                                        5.48MB              
<missing>           48 years ago                                                        6.12kB              
<missing>           48 years ago                                                        82B                 
<missing>           48 years ago                                                        118B                
<missing>           48 years ago                                                        6.12kB