ev/
correct.rs

1//! `ev correct` — append a corrective CHILD tick that fixes a stale non-hashed tag (authority /
2//! jurisdiction / provenance) on an existing decision, under ev's append-only law.
3//!
4//! The child copies the target's HASHED payload (decision / observe / grounds) verbatim — so it is
5//! recognizably the same decision — and carries the corrected tag; it is funneled through
6//! `capture::append` (a new id at HEAD), so the target tick is NEVER rewritten. A human authors it
7//! (blame required); it is UNREACHABLE from migrate / canonical-intake, so an adapter can never
8//! launder a tag. `brief`/`list` then collapse the lineage to its current (latest) state, so the
9//! corrected child surfaces and the stale parent stays as honest history.
10
11use crate::capture::{append, Decision};
12use crate::store::Store;
13use crate::tick::Tick;
14use std::path::Path;
15
16pub struct CorrectArgs {
17    pub id: String,
18    pub authority: Option<String>,
19    pub jurisdiction: Option<String>,
20    pub provenance: Option<String>,
21    pub blame: Option<String>,
22}
23
24pub fn run(repo: &Path, a: CorrectArgs) -> Result<Tick, String> {
25    let store = Store::at(repo);
26    if !store.exists() {
27        return Err("no .evolving/ store here — run `ev init` first".into());
28    }
29    let target = store
30        .read_tick(&a.id)
31        .map_err(|e| format!("reading {}: {e}", a.id))?
32        .ok_or_else(|| format!("no such tick: {}", a.id))?;
33
34    // At least one tag must be supplied (else there is nothing to correct), and each is vocab-checked.
35    if a.authority.is_none() && a.jurisdiction.is_none() && a.provenance.is_none() {
36        return Err(
37            "ev correct needs at least one of --authority / --jurisdiction / --provenance".into(),
38        );
39    }
40    if let Some(v) = &a.authority {
41        crate::capture::validate_authority(v)?;
42    }
43    if let Some(v) = &a.jurisdiction {
44        crate::tick::validate_jurisdiction(v)?;
45    }
46    if let Some(v) = &a.provenance {
47        crate::tick::validate_provenance(v)?;
48    }
49
50    // The corrected tags: an override wins; otherwise inherit the target's (a tag-correction does not
51    // re-author the decision, so an unspecified tag — including provenance — carries over unchanged).
52    let authority = a.authority.clone().or_else(|| target.authority.clone());
53    let jurisdiction = a
54        .jurisdiction
55        .clone()
56        .or_else(|| target.jurisdiction.clone());
57    let provenance = a.provenance.clone().or_else(|| target.provenance.clone());
58
59    // Refuse a no-op: if nothing actually changes, there is nothing to correct.
60    if authority == target.authority
61        && jurisdiction == target.jurisdiction
62        && provenance == target.provenance
63    {
64        return Err(format!(
65            "tick {} already carries those tags — nothing to correct",
66            a.id
67        ));
68    }
69    // A detect-only (C/D) decision may carry no runnable Test check — refuse a correction that would
70    // make the tick violate that structural lock (the same shared predicate verify + ingest use).
71    if crate::tick::detect_only_carries_test(jurisdiction.as_deref(), &target.grounds) {
72        return Err(format!(
73            "cannot set jurisdiction {} on a decision that carries a test check (detect-only)",
74            jurisdiction.as_deref().unwrap_or("")
75        ));
76    }
77
78    let blame = crate::capture::resolve_blame(repo, a.blame.clone())?;
79
80    // The corrective child: the target's HASHED payload verbatim + the corrected tags, appended at
81    // HEAD (a new id, since parent_id differs). The target is never rewritten — immutability intact.
82    let child = append(
83        repo,
84        Decision {
85            observe: target.observe.clone(),
86            decision: target.decision.clone(),
87            grounds: target.grounds.clone(),
88            blame,
89            authority,
90            jurisdiction,
91            source_ref: target.source_ref.clone(),
92            provenance,
93        },
94    )?;
95    crate::events::append(&store, "correct", Some(&child.id), None);
96    Ok(child)
97}
ev/correct.rs

ev/
correct.rs
