forjar 1.31.0

Rust-native Infrastructure as Code — bare-metal first, BLAKE3 state, provenance tracing
Documentation 
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//! Observability registry: every desired-state field must be classified.
//!
//! WHY THIS EXISTS.
//!
//! forjar's failure polarity was backwards: a field nobody observed defaulted to
//! CONVERGED. Chef is the mirror image — an unloaded property yields a permanent
//! diff, so blindness makes a resource noisy rather than falsely green. This
//! registry buys that polarity cheaply: a field that participates in the desired
//! state must be declared either observable (with a value to mutate it to, so
//! the behavioural gate can dirty a baseline) or explicitly unobservable with a
//! reason. There is no third option and no default.
//!
//! WHAT MAKES IT A GATE RATHER THAN A DOCUMENT.
//!
//! The set of desired-state fields is discovered by REFLECTION, not from a
//! hand-written list. `hashed_fields()` serializes a Resource, mutates one field
//! at a time, and reports which mutations change `hash_desired_state`. Adding a
//! field to the hash therefore adds it to that set automatically, and
//! `every_hashed_field_is_classified` fails until someone decides what it is.
//!
//! A hand-written list is precisely what this fleet has been bitten by before —
//! `forjar check` passed for five months behind assertions that enumerated
//! fields by hand and silently omitted the interesting ones.

use crate::core::types::Resource;

mod classify_e01;

/// What forjar can find out about a declared field on a real host.
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum Observability {
    /// The host can be asked. `alt` is a DIFFERENT valid value, used by the
    /// behavioural gate to seed a present-but-wrong baseline: apply with `alt`,
    /// then apply the declaration, then assert the host matches the
    /// declaration. That sequence is the one Molecule's
    /// destroy→create→converge default skips, and it is the only state in which
    /// the 2026-08-19 mount bug was visible.
    Observed { alt: &'static str },
    /// There is genuinely nothing to observe. An action has no converged form;
    /// `output_artifacts` is the honest answer for those. A reason is REQUIRED
    /// so this cannot become a shrug.
    Unobservable(&'static str),
    /// Observable in principle, not yet done. Carries a ticket so the backlog is
    /// countable rather than implied.
    Unmigrated(&'static str),
}

/// Classify one desired-state field.
///
/// Deliberately keyed on the FIELD NAME alone rather than (type, field). Twenty
/// resource types by fourteen fields is 280 arms that one operator will not
/// maintain, and the per-type nuance that actually matters lives in the
/// behavioural gate's fixtures, not here. What this table has to guarantee is
/// narrower and sufficient: no hashed field is unclassified.
pub fn classify(field: &str) -> Option<Observability> {
    // A TABLE, not control flow. Thirty-two arms of `field => value` is data
    // wearing a `match`'s clothes: the grader read it as cyclomatic complexity
    // 34 and CB-200 counted it among the functions below grade A, which is how
    // the 1.26.0 cut found it (PMAT-206). Nothing about the mapping changed.
    FIELDS
        .iter()
        .find(|(name, _)| *name == field)
        .map(|(_, obs)| obs.clone())
        .or_else(|| classify_e01::classify(field))
}

/// Every desired-state field this module classifies, and what the host can say
/// about it. `alt` is the value the behavioural gate writes to prove the field
/// is observed: applying it must change what `check` or `state_query` reports.
static FIELDS: &[(&str, Observability)] = &[
    ("path", Observability::Observed { alt: "/tmp/forjar-alt-path" }),
    ("content", Observability::Observed { alt: "forjar-alt-content" }),
    ("source", Observability::Observed { alt: "//forjar-alt/share" }),
    ("fs_type", Observability::Observed { alt: "nfs" }),
    ("options", Observability::Observed { alt: "ro" }),
    ("owner", Observability::Observed { alt: "nobody" }),
    ("group", Observability::Observed { alt: "nogroup" }),
    ("mode", Observability::Observed { alt: "0600" }),
    ("version", Observability::Observed { alt: "0.0.1-forjar-alt" }),
    ("packages", Observability::Observed { alt: "forjar-alt-package" }),
    ("state", Observability::Observed { alt: "absent" }),
    ("target", Observability::Observed { alt: "/tmp/forjar-alt-target" }),
    ("provider", Observability::Unobservable("selects the mechanism, not the state; the host cannot report which provider installed a thing")),
    ("name", Observability::Unobservable("an identifier, not a property of the host")),
    ("fstype", Observability::Observed { alt: "nfs" }),
    ("shell", Observability::Observed { alt: "/usr/sbin/nologin" }),
    ("home", Observability::Observed { alt: "/tmp/forjar-alt-home" }),
    ("image", Observability::Observed { alt: "forjar/alt-image:0" }),
    ("ports", Observability::Observed { alt: "9999:9999" }),
    ("port", Observability::Observed { alt: "9999" }),
    ("volumes", Observability::Observed { alt: "/tmp/forjar-alt-vol" }),
    ("environment", Observability::Observed { alt: "FORJAR_ALT=1" }),
    ("restart", Observability::Observed { alt: "no" }),
    ("schedule", Observability::Observed { alt: "0 0 31 2 *" }),
    ("command", Observability::Observed { alt: "true # forjar-alt" }),
    ("overlay_ip", Observability::Observed { alt: "10.42.0.254" }),
    ("overlay_iface", Observability::Observed { alt: "forjar-alt0" }),
    ("protocol", Observability::Observed { alt: "udp" }),
    ("from", Observability::Observed { alt: "10.42.0.0/24" }),
    ("completion_check", Observability::Observed { alt: "false # forjar-alt-completion-check" }),
    ("action", Observability::Unobservable("names an operation to perform, not a state the host can report")),
    ("restart_on", Observability::Unobservable("a trigger condition, not observable state; the host cannot say what would have restarted it")),
    // PMAT-560: `service`'s state query reports the loaded unit's ExecStart
    // program and the sha256 of the file at that path, once either is declared.
    ("exec_start", Observability::Observed { alt: "/tmp/forjar-alt-exec.sh" }),
    ("exec_sha256", Observability::Observed { alt: "0000000000000000000000000000000000000000000000000000000000000000" }),
];

/// Every field whose mutation changes `hash_desired_state`, found by reflection.
///
/// Serializes a baseline Resource, and for each JSON field substitutes a marker
/// value and re-hashes. A field whose mutation moves the hash is, by
/// definition, part of the desired state and must be classified.
///
/// This is the forcing function. It cannot go stale the way a hand-written list
/// does, because it asks the hasher rather than a human.
pub fn hashed_fields() -> Vec<String> {
    use crate::core::planner::hashing::hash_desired_state;

    let base = Resource::default();
    let base_hash = hash_desired_state(&base);
    let Ok(serde_json::Value::Object(map)) = serde_json::to_value(&base) else {
        return Vec::new();
    };

    let mut out = Vec::new();
    for key in map.keys() {
        let mut probe = map.clone();
        // A string is accepted by Option<String>, Vec<String> (as one element)
        // and most scalar fields; anything that fails to deserialize simply does
        // not get probed, which is safe — it cannot silently claim "unhashed".
        probe.insert(key.clone(), serde_json::json!("forjar-probe-sentinel"));
        let as_list = {
            let mut p = map.clone();
            p.insert(key.clone(), serde_json::json!(["forjar-probe-sentinel"]));
            p
        };
        for candidate in [probe, as_list] {
            if let Ok(r) = serde_json::from_value::<Resource>(serde_json::Value::Object(candidate))
            {
                if hash_desired_state(&r) != base_hash {
                    out.push(key.clone());
                    break;
                }
            }
        }
    }
    out.sort();
    out.dedup();
    out
}

#[cfg(test)]
mod tests;