87 lines
3.9 KiB
Markdown
87 lines
3.9 KiB
Markdown
# Pre8 Responsibility-Alignment Baseline
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## Repository Identity
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The following identities were read directly from Git objects at execution-start
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commit `475b62437f89a8a98e0e3a1d1628481768525cb2`:
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```text
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execution-start commit: 475b62437f89a8a98e0e3a1d1628481768525cb2
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execution-start tree: 3f0bc6be8324446440ce578f03d892c95f73591c
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repo-pre-7 tree: b8f9af2cd55225c4348b79ff5910ae6fc83cd517
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repo-pre-8 tree: b8f9af2cd55225c4348b79ff5910ae6fc83cd517
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```
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The equal `repo-pre-7` and `repo-pre-8` tree identities establish that
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`repo-pre-8` is an exact tracked snapshot of `repo-pre-7` at the execution
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start. This relationship is based on Git object identities, not a live
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worktree comparison.
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Relevant source identities at the same commit are:
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```text
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mode blob path
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100644 e06822e363d9122a39256494bde7d12cfea1f7c9 repo-pre-8/src/decompressor.c
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100644 ff595fe009679a4e950eb3743b2f152fac4aad31 repo-pre-8/src/decompressor_lzma.c
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100644 f3e48cd2016608aaf84ed5e80151782a6c5513f7 repo-pre-8/src/decompressor_deflate.c
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100644 23756af263ceb148ca50fbb8cd1ae80ba3fac4cd repo-pre-8/src/decompressor_zstd.c
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100644 cac9ee15f81a1607a03fbab3466cf89c588872c8 repo-pre-8/src/internal.h
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100644 2257a2299b3bcf3ab15978d723843f26d0b4b346 repo-pre-8/src/xattr.c
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```
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These values define the immutable comparison baseline for Pre8. Concurrent
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or later worktree changes are not assessed by this document.
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## Execution Scope
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Pre8 is limited to the following private responsibility-alignment tasks:
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1. Move `z_erofs_load_lzma_config()` from the core decompressor file to the
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LZMA backend without changing its name, signature, validation order,
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state updates, or error behavior.
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2. Move `z_erofs_load_deflate_config()` to the DEFLATE backend with its
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existing format checks, window-bit limits, state updates, and errors
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preserved.
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3. Move `z_erofs_load_zstd_config()` to the ZSTD backend while preserving the
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availability check, configuration checks, window-log limit, diagnostics,
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and `WITH_ZSTDIO` behavior.
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4. Replace the duplicated inline and shared xattr traversal paths with shared
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private iterator helpers while preserving lookup priority, list order,
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namespace and errno timing, validation differences, output accounting, and
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buffer ownership.
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The source allowlist is restricted to the six files identified above. This
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baseline file is the only documentation path used by the baseline step.
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Pre8 does not include superblock extraction, a new `compress.h` contract,
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descriptor tables, decode callback ABI changes, codec primitive renaming,
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typed errno conversion, Linux page or folio abstractions, broad function
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reordering, or any item already recorded under `planning/reject/`.
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## Initial Validation Status
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This document records the execution baseline only. No implementation,
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correctness, build, or runtime conclusion is made here.
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| Validation item | Initial status |
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| Pre8 source implementation | NOT RUN |
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| Source allowlist and protected-path audit | NOT RUN |
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| `git diff --check` | NOT RUN |
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| Loader definition, declaration, reference, and body-equivalence checks | NOT RUN |
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| Xattr iterator invariant and behavior review | NOT RUN |
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| Direct-parent restoration checks for source commits | NOT RUN |
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| Final-HEAD inverse-patch compatibility checks | NOT RUN |
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| `WITH_ZSTDIO=0` build | NOT RUN |
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| `WITH_ZSTDIO=1` build | NOT RUN |
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| Basic plain/LZ4 QEMU mount, read, readdir, and unmount smoke | NOT RUN |
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| Pre7 deferred QEMU coverage | NOT RUN |
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| Pre8 xattr QEMU coverage | NOT RUN |
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| Pre8 codec QEMU coverage | NOT RUN |
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| QEMU cleanup and zero-residual-state checks | NOT RUN |
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| Completion and evidence-honesty review | NOT RUN |
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Historical evidence from an earlier snapshot is not a Pre8 result. Every
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status above remains `NOT RUN` until supported by fresh evidence from the
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final Pre8 DUT. This file must not be interpreted as a completion report.
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