fix(smart v0.1.17): smart_status optionnel + AmbientCapabilities CAP_SYS_ADMIN

- SmartJson.smart_status devient Option<SmartStatus> avec #[serde(default)]
  → parsing non-bloquant si le champ est absent (ex: NVME_IOCTL_ADMIN_CMD échoue)
- Service: suppression NoNewPrivileges, ajout AmbientCapabilities=CAP_SYS_ADMIN
  → smartctl hérite la capability via execve (kernel ≥ 5.2)
- Nettoyage logs debug (suppression dump JSON brut)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

agent/Cargo.lock

@@ -248,7 +248,7 @@ dependencies = [
 
 [[package]]
 name = "nanometrics-agent"
-version = "0.1.15"
+version = "0.1.17"
 dependencies = [
  "libc",
  "rumqttc",

agent/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "nanometrics-agent"
-version = "0.1.15"
+version = "0.1.17"
 edition = "2021"
 
 [lib]

agent/src/metrics/smart.rs

@@ -2,7 +2,8 @@ use serde::Deserialize;
 
 #[derive(Deserialize)]
 struct SmartJson {
-    smart_status: SmartStatus,
+    #[serde(default)]
+    smart_status: Option<SmartStatus>,
     temperature: Option<SmartTemp>,
     ata_smart_attributes: Option<SmartAttrs>,
     nvme_smart_health_information_log: Option<NvmeHealth>,
@@ -78,7 +79,7 @@ pub fn parse_json(json: &str) -> Result<crate::payload::SmartMetrics, serde_json
 
     Ok(crate::payload::SmartMetrics {
         device: String::new(),
-        passed: s.smart_status.passed,
+        passed: s.smart_status.as_ref().map(|s| s.passed).unwrap_or(false),
         temperature,
         reallocated_sectors: reallocated,
         power_on_hours: power_hours,
@@ -125,12 +126,9 @@ pub fn collect() -> Option<Vec<crate::payload::SmartMetrics>> {
             Ok(o) => o,
             Err(e) => { eprintln!("[smart] erreur exec smartctl {}: {}", dev, e); continue }
         };
-        eprintln!("[smart] smartctl {} → exit={}, stdout={} octets, stderr={} octets",
-            dev, output.status, output.stdout.len(), output.stderr.len());
         let json = String::from_utf8_lossy(&output.stdout);
         match parse_json(&json) {
             Ok(metrics) => {
-                eprintln!("[smart] {} parsé OK (passed={})", dev, metrics.passed);
                 results.push(crate::payload::SmartMetrics {
                     device: dev.trim_start_matches("/dev/").to_string(),
                     ..metrics
@@ -138,7 +136,6 @@ pub fn collect() -> Option<Vec<crate::payload::SmartMetrics>> {
             }
             Err(e) => {
                 eprintln!("[smart] {} parse JSON échoué: {}", dev, e);
-                eprintln!("[smart] premiers 200 octets stdout: {:?}", &json.chars().take(200).collect::<String>());
             }
         }
     }

deploy/nanometrics-agent.service

@@ -17,7 +17,12 @@ ConfigurationDirectoryMode=0755
 ProtectSystem=strict
 ProtectHome=read-only
 PrivateTmp=yes
-NoNewPrivileges=yes
+# CAP_SYS_ADMIN est requis par le noyau pour NVME_IOCTL_ADMIN_CMD (lecture SMART NVMe).
+# NoNewPrivileges est retiré car il efface les ambient capabilities sur exec (noyau ≥ 5.2),
+# ce qui empêcherait smartctl enfant d'hériter la capability.
+# CapabilityBoundingSet borne à la seule cap nécessaire.
+CapabilityBoundingSet=CAP_SYS_ADMIN
+AmbientCapabilities=CAP_SYS_ADMIN
 
 RestrictAddressFamilies=AF_INET AF_INET6 AF_UNIX