repository: Add meta.json for repo metadata and cfsctl init#268
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cgwalters wants to merge 3 commits intocomposefs:mainfrom
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repository: Add meta.json for repo metadata and cfsctl init#268cgwalters wants to merge 3 commits intocomposefs:mainfrom
cgwalters wants to merge 3 commits intocomposefs:mainfrom
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Add a validated Algorithm type that wraps the fsverity-<hash>-<lg_blocksize> string format (e.g. 'fsverity-sha512-12'). Implements FromStr for parsing with proper error types and Display for serialization, so it can be used as a clap value_parser argument. Includes for_hash::<H>() constructor to derive from FsVerityHashValue types at compile time. Prep for repository metadata support. Assisted-by: OpenCode (Claude Opus 4) Signed-off-by: Colin Walters <walters@verbum.org>
Prep for repository metadata (meta.json) serialization. Assisted-by: OpenCode (Claude Opus 4) Signed-off-by: Colin Walters <walters@verbum.org>
Add a meta.json file to the repository format that records the digest algorithm, format version, and feature flags, so tools can auto-detect the configuration instead of requiring --hash on every invocation. The versioning model is inspired by Linux filesystem superblocks (ext4, XFS, EROFS): a base version integer for fundamental layout changes, plus three tiers of feature flags for finer-grained evolution: - compatible: old tools can safely ignore - read-only-compatible: old tools may read but must not write - incompatible: old tools must refuse the repository entirely Because creating a repo is no longer just `mkdir`, add 'cfsctl init --algorithm=fsverity-sha512-12 [path]'. Closes: composefs#181 Assisted-by: OpenCode (Claude Opus 4) Signed-off-by: Colin Walters <walters@verbum.org>
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Add a meta.json file to the repository format that records the digest
algorithm, format version, and feature flags, so tools can auto-detect
the configuration instead of requiring --hash on every invocation.
The versioning model is inspired by Linux filesystem superblocks
(ext4, XFS, EROFS): a base version integer for fundamental layout
changes, plus three tiers of feature flags for finer-grained
evolution:
Because creating a repo is no longer just
mkdir, add'cfsctl init --algorithm=fsverity-sha512-12 [path]'.
Closes: #181