Add package for converting tar to erofs#289
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Signed-off-by: Derek McGowan <derek@mcg.dev>
WithTarIndexData enables tar-index mode in Apply. When set, file payload bytes are written to an external data file (via go-erofs WithDataFile) at 512-byte-block-aligned positions, and the EROFS writer records chunk-index entries pointing into that file rather than copying bytes into its internal spool. The resulting EROFS image is metadata-only: filesystem structure, inode table, and chunk-index table. Combining it with the data file produces a blob where a kernel consumer can locate file content directly via DeviceID=1 chunk references. This replaces the mkfs.erofs --tar=i --aufs subprocess invocation with a pure-Go implementation. Block size is set to 512 to match tar's natural granularity (each header block is 512 bytes). Adds three tests: - TestWithTarIndexDataBasic: round-trips a file through the combined blob - TestWithTarIndexDataFileListing: compares file listing with full extraction - TestWithTarIndexDataWhiteouts: verifies OCI whiteout translation Signed-off-by: Derek McGowan <derek@mcg.dev>
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Adds package
github.com/containerd/continuity/tarconvwhich uses the go-erofs library to convert a tar stream into erofs.