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c88337c9ac
Docker images used to be, essentially, a linked list of layers. Each
layer would have a tarball and a json document pointing to its parent,
and the image pointed to the top layer:
imageA ----> layerA
|
v
layerB
|
v
layerC
The current image spec changed this format to where the Image defined
the order and set of layers:
imageA ---> layerA
|--> layerB
`--> layerC
For backwards compatibility, docker produces images which follow both
specs: layers point to parents, and images also point to the entire
list:
imageA ---> layerA
| |
| v
|--> layerB
| |
| v
`--> layerC
This is nice for tooling which supported the older version and never
updated to support the newer format.
Our `buildImage` code only supported the old version, so in order for
`buildImage` to properly generate an image based on another image
with `fromImage`, the parent image's layers must fully support the old
mechanism.
This is not a problem in general, but is a problem with
`buildLayeredImage`.
`buildLayeredImage` creates images with newer image spec, because
individual store paths don't have a guaranteed parent layer. Including
a specific parent ID in the layer's json makes the output less likely
to cache hit when published or pulled.
This means until now, `buildLayeredImage` could not be the input to
`buildImage`.
The changes in this PR change `buildImage` to only use the layer's
manifest when locating parent IDs. This does break buildImage on
extremely old Docker images, though I do wonder how many of these
exist.
This work has been sponsored by Target.
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| .. | ||
| agda | ||
| bintools-wrapper | ||
| build-bazel-package | ||
| build-dotnet-package | ||
| build-fhs-userenv | ||
| build-setupcfg | ||
| buildenv | ||
| cc-wrapper | ||
| docker | ||
| dotnetbuildhelpers | ||
| dotnetenv | ||
| emacs | ||
| expand-response-params | ||
| fetchbower | ||
| fetchbzr | ||
| fetchcvs | ||
| fetchdarcs | ||
| fetchdocker | ||
| fetchegg | ||
| fetchfossil | ||
| fetchgit | ||
| fetchgitlocal | ||
| fetchgx | ||
| fetchhg | ||
| fetchipfs | ||
| fetchmavenartifact | ||
| fetchmtn | ||
| fetchnuget | ||
| fetchpatch | ||
| fetchrepoproject | ||
| fetchs3 | ||
| fetchsvn | ||
| fetchsvnrevision | ||
| fetchsvnssh | ||
| fetchurl | ||
| fetchzip | ||
| icon-conv-tools | ||
| kernel | ||
| libredirect | ||
| make-desktopitem | ||
| make-startupitem | ||
| make-symlinks | ||
| mkshell | ||
| mono-dll-fixer | ||
| nix-prefetch-github | ||
| nuke-references | ||
| ocaml | ||
| references-by-popularity | ||
| release | ||
| remove-references-to | ||
| rust | ||
| setup-hooks | ||
| singularity-tools | ||
| skaware | ||
| src-only | ||
| substitute | ||
| substitute-files | ||
| templaterpm | ||
| upstream-updater | ||
| vm | ||
| wrapper-common | ||
| writers | ||
| build-maven.nix | ||
| build-pecl.nix | ||
| closure-info.nix | ||
| dhall-to-nix.nix | ||
| plugins.nix | ||
| replace-dependency.nix | ||
| setup-systemd-units.nix | ||
| source-from-head-fun.nix | ||
| trivial-builders.nix | ||