revert: switch back to the legacy mediatype for v0.1.0

[chlins]

This pull request updates the codebase to use the github.com/dragonflyoss/model-spec/specs-go/v1 package instead of the deprecated github.com/modelpack/model-spec/specs-go/v1 for model specifications. Additionally, it introduces compatibility with legacy model spec types and annotations where appropriate. The changes ensure consistency and future compatibility with the new model spec source.

Migration to new model spec package:

• All import statements referencing github.com/modelpack/model-spec/specs-go/v1 have been updated to use github.com/dragonflyoss/model-spec/specs-go/v1 across backend and test files, including attach.go, build.go, builder.go, processor files, and test mocks. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12]

Legacy model spec compatibility:

• In pkg/backend/attach.go, references to model spec types and constants have been updated to use legacymodelspec instead of modelspec for media types and model config structures, ensuring backward compatibility. [1] [2] [3]
• In pkg/backend/processor/base.go, sorting logic for descriptors now checks both the new and legacy annotation keys for file paths, improving compatibility with older model spec annotations. [1] [2]

[gemini-code-assist]

Summary of Changes

Hello @chlins, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request implements a revert to ensure compatibility with the legacy mediatype for version 0.1.0. It primarily involves switching the model specification package from "github.com/modelpack/model-spec/specs-go/v1" back to "github.com/dragonflyoss/model-spec/specs-go/v1". Additionally, it introduces explicit handling for these legacy types and annotations to maintain backward compatibility within the system.

Highlights

• Revert Model Specification Package: The codebase has been updated to switch back to using "github.com/dragonflyoss/model-spec/specs-go/v1" for model specifications, replacing the "github.com/modelpack/model-spec/specs-go/v1" package across various backend and test files.
• Legacy Mediatype Integration: In "pkg/backend/attach.go", references to model spec types and constants now explicitly use "legacymodelspec" (which points to "dragonflyoss") for media types and model configuration, ensuring proper handling of the older format.
• Enhanced Annotation Compatibility: The sorting logic for descriptors in "pkg/backend/processor/base.go" has been improved to check for file paths using both the current ("modelpack") and legacy ("dragonflyoss") annotation keys, providing robust compatibility with different model spec versions.

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[gemini-code-assist]

Code Review

This pull request primarily updates the model specification dependency from github.com/modelpack/model-spec/specs-go/v1 to github.com/dragonflyoss/model-spec/specs-go/v1 and adds backward compatibility for legacy annotations. The changes are mostly straightforward dependency updates across several files. However, I've identified a critical bug in the sorting logic within pkg/backend/processor/base.go due to a copy-paste error, which would cause incorrect sorting of descriptors. I've provided a fix for this issue. It's also worth noting that the pull request title and description seem to be contradictory, which could cause confusion. The title suggests a revert, while the description and code changes indicate a migration to a new package.

[aftersnow]

lgtm