generated from coulomb/repo-seed
tegwick
d2c73b02d9
WP-0009 git-backed DecisionLog + per-space append authority (keystone backing); WP-0010 derived views (wikilinks, BackLinks, RecentChanges, AllPages/SiteMap); WP-0011 incremental union + equivalence index + I-2 verification; WP-0012 second adapter (git-IS-store) validating the contract on a new substrate. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
97 lines
3.4 KiB
Markdown
97 lines
3.4 KiB
Markdown
---
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id: SHARD-WP-0012
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type: workplan
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title: "second adapter — git-IS-store shard (contract validation on a new substrate)"
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domain: whynot
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repo: shard-wiki
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status: active
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owner: tegwick
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topic_slug: whynot
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created: "2026-06-15"
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updated: "2026-06-15"
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depends_on:
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- SHARD-WP-0007
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- SHARD-WP-0008
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---
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# SHARD-WP-0012 — git-IS-store shard adapter
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## Goal
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Add a **second adapter on a different substrate** to validate the contract beyond the plain
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folder: a **git-IS-store** shard (`FederationArchitecture` T17 / TSD §A.3 — the home case where
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git is the store *and* the journal). It exercises git-native history (TSD §A.5 *adopt*),
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commit-as-write, `current_rev`=commit-sha drift detection, and the implication rules
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(attachment=git-IS-store ⟹ substrate=git ∧ history=git-native). Proves "writing an adapter +
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declaring a verified profile" is all it takes — no core changes.
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**Non-goal:** remote push/pull federation (VCS-replication+ping is a federation workplan);
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merge beyond fast-forward (apply-under-drift refuse is enough, as in SHARD-WP-0008).
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## Context
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- Contract: `TechnicalSpecificationDocument.md` §A; binding taxonomy §A.3; history §A.5.
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- Reuses the existing contract/conformance/overlay machinery unchanged.
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---
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## GitShardAdapter — read over a git working tree/repo
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```task
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id: SHARD-WP-0012-T1
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status: todo
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priority: high
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```
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A `GitShardAdapter` reading Markdown from a git repo: keys = tracked `*.md` paths; `read`
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returns a `Page` whose `source_rev` is the **commit sha** (HEAD or blob commit); profile =
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git-IS-store / substrate=git / history=git-native / addressing=path, validated against the
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implication rules. Tests: read tracked files; profile validates; conformance read path passes.
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## Write = commit; current_rev = sha (drift)
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```task
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id: SHARD-WP-0012-T2
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status: todo
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priority: high
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```
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`write(key, body)` stages + **commits** (author/message), returning the updated `Page` at the
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new sha; `current_rev(key)` returns the current commit sha for drift detection. Declare `WRITE`
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+ `version`. Tests: write commits; conformance positive-write probe passes; `current_rev`
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changes after an external commit.
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## History adopt + integration with union/overlay
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```task
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id: SHARD-WP-0012-T3
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status: todo
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priority: medium
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```
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Adopt git-native history (TSD §A.5 *adopt*): expose a minimal page history (commit list for a
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path) behind a `version`-gated method. Integration: attach a `GitShardAdapter` to an
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`InformationSpace` alongside a `FolderAdapter` → resolve/chorus/edit/overlay/apply all work
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across substrates (apply-under-drift uses sha rev). Update SCOPE; `pytest` + pyflakes green.
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---
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## Acceptance criteria
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- `GitShardAdapter` passes the conformance suite (read + positive write) with a profile whose
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implication rules hold (git-IS-store ⟹ git substrate + git-native history).
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- Write = commit; `current_rev` = sha drives apply-under-drift correctly.
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- The union/overlay/edit machinery works unchanged across folder + git shards (no core change —
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capability-as-data proven on a second substrate).
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- `pytest` + pyflakes green; each task committed; state-hub synced.
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## Notes
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If `git` plumbing via subprocess proves heavy for tests, a thin in-repo git helper (or
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`tmp_path` repos created in tests) is acceptable; no new runtime dependency — use stdlib +
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`git` CLI already present.
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## Suggested task order
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T1 read adapter + profile → T2 write=commit + current_rev → T3 history adopt + integration.
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