feat(cache): pin the build-environment image in the escrow manifest#106
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An escrow archive restores data, but a rebuild years later also needs a runnable environment (emb, the Flutter SDK, a period host). Let the archive reference the container image that reconstructs it. - `emb cache export --image <ref>` records the build-environment image (from `emb cross --dockerfile`) in the manifest, warning when the ref is a mutable tag rather than a digest. - `emb cache import` reports the pinned image so the operator knows which environment to pull. Adds `isImageDigestPinned` and an `env_image` manifest field; README and tests updated. Signed-off-by: Joel Winarske <joel.winarske@linux.com>
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Extends the escrow archive (#102) so it references the environment, not just the data. An archive restores bytes, but a rebuild years on also needs a runnable environment — emb, the Flutter SDK, a period-appropriate host. This lets the archive pin the container image that reconstructs it.
What
emb cache export --image <ref>records the build-environment image (the oneemb cross --dockerfileemits, baking emb + toolchain + sysroot) into the archive manifest asenv_image. It warns when<ref>is a mutable tag rather than a digest, since only a digest is a durable escrow anchor.emb cache importreports the pinned image so the operator knows which environment to pull before restoring the data.Structure
cache_archive.dart:archiveManifestgains an optionalenvImage; new pureisImageDigestPinned(ref)(matches…@sha256:<hex>).Test
dart analyze lib testclean;dart format --set-exit-if-changedclean.cache_archive_test.dartcovers theenv_imagefield (present/absent) andisImageDigestPinned(digest vs tag).real dpkg-deb/real debugfsenv failures.Docs
README
emb cachetable (export --image,importreporting) and the escrow paragraph explain data-vs-environment and cross-linkemb cross --dockerfile.