erofs: Switch default format version from V2 to V1#330
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This is one of the goals in getting to composefs-rs 1.0. V1 is compatible with both C mkcomposefs 1.0.8 and composefs-rs, making it the better default for interoperability. V2 remains available for users who need it. For backward compatibility, old repositories that lack an explicit erofs_formats field in meta.json continue to use V2 via a separate serde default (legacy_erofs_default), ensuring they are not silently reinterpreted as V1. Tests that validate specific V2 behavior (directory entry assertions without whiteout stubs, V2-only OCI image refs, digest stability pinning) now use V2 explicitly. Closes: composefs#327 Assisted-by: opencode (Claude claude-opus-4-6) Signed-off-by: Colin Walters <walters@verbum.org>
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This is one of the goals in getting to composefs-rs 1.0.
V1 is compatible with both C mkcomposefs 1.0.8 and composefs-rs, making it the better default for interoperability. V2 remains available for users who need it.
For backward compatibility, old repositories that lack an explicit erofs_formats field in meta.json continue to use V2 via a separate serde default (legacy_erofs_default), ensuring they are not silently reinterpreted as V1.
Tests that validate specific V2 behavior (directory entry assertions without whiteout stubs, V2-only OCI image refs, digest stability pinning) now use V2 explicitly.
Closes: #327
Assisted-by: opencode (Claude claude-opus-4-6)