feat: support raw format for attach command

[chlins]

This pull request introduces a new feature to support attaching model artifact layers in raw format and includes several related updates across the codebase. Key changes include adding a Raw flag to the configuration, modifying the processor logic to handle the raw format, and updating tests and dependencies accordingly.

New Feature: Support for Raw Format

• Added a Raw flag to the Attach struct in pkg/config/attach.go and initialized it in the NewAttach function. This flag enables attaching model artifact layers in raw format. [1] [2]
• Updated the cmd/attach.go file to include the Raw flag in the CLI options.

Processor Logic Enhancements

• Modified the getProcessor function in pkg/backend/attach.go to use the Raw flag to determine the appropriate media type for different file types. Added support for raw formats in model config, model weight, model code, and model doc processors.
• Updated the Attach method to pass the cfg parameter to getProcessor and replaced manual slice manipulation with the slices.Delete function for improved readability and safety.

Dependency and Test Updates

• Added the slices package to the imports in pkg/backend/attach.go to utilize the slices.Delete function.
• Updated the test case in pkg/backend/attach_test.go to pass the cfg parameter to the getProcessor function.

Minor Adjustments

• Increased the refresh rate of the progress bar in internal/pb/pb.go from 200ms to 300ms for smoother updates.

[Copilot]

Pull Request Overview

This PR introduces a new Raw flag to the attach command, enabling the use of “raw” media types when attaching model artifact layers, and makes related updates across the codebase.

• Add Raw boolean to Attach config and wire it through the CLI
• Extend getProcessor to pick raw media types and replace manual slice removal with slices.Delete
• Update tests and bump progress bar refresh rate for smoother updates

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
pkg/config/attach.go	Added Raw field to Attach struct and initialized it in NewAttach
cmd/attach.go	Exposed --raw flag in the attach command
pkg/backend/attach.go	Updated getProcessor signature to accept Raw, select raw media types, and use slices.Delete
pkg/backend/attach_test.go	Updated test call to getProcessor to include *config.Attach
internal/pb/pb.go	Increased progress bar refresh rate from 200ms to 300ms

Comments suppressed due to low confidence (1)

pkg/backend/attach_test.go:76

• Tests currently only cover the default (Raw=false) path. Add a test case where &config.Attach{Raw: true} is passed to verify that the processor uses the raw media types.

			proc := b.getProcessor(tt.filepath, &config.Attach{})

[gaius-qi]

LGTM