fix

src-tauri/src/launcher.rs

@@ -2427,11 +2427,24 @@ impl Launcher {
     // The commit the LIVE pack was cut from. Read from this PC's own copy of that version,
     // which costs nothing; when this PC is on an older version we simply do not know, and
     // the panel says so rather than guessing.
-    let pack_commit = match (&installed, &pack_live) {
-      (Some(have), Some(live)) if have == live => std::fs::read(Layout::new(&install_dir, have).version_dir().join("manifest.json"))
+    // One read, two answers. The commit is only trusted when this PC is ON the live version
+    // (an older copy says where IT came from, not where the live pack did), but the data
+    // payload is worth showing either way - it is carried forward unchanged, so an older
+    // manifest describes the same seed and the same tiles.
+    let manifest = installed.as_ref().and_then(|have| {
+      std::fs::read(Layout::new(&install_dir, have).version_dir().join("manifest.json"))
         .ok()
         .and_then(|raw| serde_json::from_slice::<serde_json::Value>(&raw).ok())
-        .and_then(|m| m.get("source_commit").and_then(|c| c.as_str().map(str::to_string))),
+    });
+    let is_live = matches!((&installed, &pack_live), (Some(have), Some(live)) if have == live);
+    let pack_commit = match (is_live, &manifest) {
+      (true, Some(m)) => m.get("source_commit").and_then(|c| c.as_str().map(str::to_string)),
+      _ => None,
+    };
+    let data = match (&manifest, &installed) {
+      (Some(m), Some(have)) => {
+        Some(crate::release::data_from_manifest(m, have, is_live, now_secs() as i64))
+      }
       _ => None,
     };
     // The launcher's own feeds are public, so this needs no token.
@@ -2477,6 +2490,7 @@ impl Launcher {
       launcher_live,
       launcher_commit,
       None,
+      data,
     )
   }
 

src-tauri/src/release.rs

@@ -23,6 +23,9 @@ pub struct ReleasePlan {
   pub items: Vec<ReleaseItem>,
   /// Why the whole thing cannot run, in one line; None when it can.
   pub blocked: Option<String>,
+  /// What the pack carries but a release does not rebuild. None when nothing is installed
+  /// here, so there is no manifest to read it from.
+  pub data: Option<ReleaseData>,
 }
 
 #[derive(Clone, Debug, Serialize)]
@@ -115,6 +118,107 @@ fn item(
   ReleaseItem { key, title, live, commit: commit.map(|c| c[..c.len().min(7)].to_string()), behind, dirty, note }
 }
 
+/// What a pack carries that a code release does NOT rebuild.
+///
+/// `cut_pack.py` copies the database seed, the source chunks and the tile sets forward from
+/// the previous version every time, and asserts they did not change - which is what keeps a
+/// code release from quietly altering data. The cost is that they age invisibly: the seed and
+/// the tiles are whatever they were the day someone last built them. This puts a date on it.
+#[derive(Clone, Debug, Serialize)]
+pub struct ReleaseData {
+  /// The version whose manifest these numbers were read from.
+  pub version: String,
+  /// Whether that is also what the DHP serves, so the numbers describe the live pack.
+  pub is_live: bool,
+  /// The seed's snapshot stamp, e.g. `20260921T125618Z`.
+  pub db_snapshot: Option<String>,
+  pub db_age_days: Option<i64>,
+  pub db_bytes: u64,
+  pub tile_sets: usize,
+  pub tile_bytes: u64,
+  /// Every distinct dataset the tile sets name.
+  pub tile_datasets: Vec<String>,
+  /// The age of the OLDEST dated dataset, which is what decides how stale the maps are. A
+  /// name carrying no date (`planet_heightmap`) is not counted: that one does not move.
+  pub tiles_age_days: Option<i64>,
+}
+
+/// Days from 1970-01-01 to y-m-d, proleptic Gregorian. Hinnant's algorithm, which is exact
+/// and needs no date crate - the alternative was a dependency to subtract two dates.
+fn days_from_civil(y: i64, m: i64, d: i64) -> i64 {
+  let y = if m <= 2 { y - 1 } else { y };
+  let era = if y >= 0 { y } else { y - 399 } / 400;
+  let yoe = y - era * 400;
+  let mp = (m + 9) % 12;
+  let doy = (153 * mp + 2) / 5 + d - 1;
+  let doe = yoe * 365 + yoe / 4 - yoe / 100 + doy;
+  era * 146_097 + doe - 719_468
+}
+
+/// How many days ago `YYYYMMDD` was, or None when those are not eight sane digits.
+fn age_days(stamp: &str, now_secs: i64) -> Option<i64> {
+  let digits: String = stamp.chars().take_while(|c| c.is_ascii_digit()).collect();
+  if digits.len() < 8 {
+    return None;
+  }
+  let y: i64 = digits[0..4].parse().ok()?;
+  let m: i64 = digits[4..6].parse().ok()?;
+  let d: i64 = digits[6..8].parse().ok()?;
+  if !(1..=12).contains(&m) || !(1..=31).contains(&d) || !(2000..=2999).contains(&y) {
+    return None;
+  }
+  Some(now_secs / 86_400 - days_from_civil(y, m, d))
+}
+
+/// The date a dataset name carries, if any: `protomaps_20260423` -> `20260423`.
+fn dataset_stamp(dataset: &str) -> Option<&str> {
+  let tail = dataset.rsplit('_').next()?;
+  (tail.len() == 8 && tail.chars().all(|c| c.is_ascii_digit())).then_some(tail)
+}
+
+/// Read the data payload out of an installed version's manifest.
+pub fn data_from_manifest(m: &serde_json::Value, version: &str, is_live: bool, now_secs: i64) -> ReleaseData {
+  let db = m.get("db");
+  let db_snapshot = db.and_then(|d| d.get("snapshot")).and_then(|s| s.as_str()).map(str::to_string);
+  let db_bytes = db
+    .and_then(|d| d.get("files"))
+    .and_then(|f| f.as_array())
+    .map(|files| files.iter().filter_map(|f| f.get("size").and_then(serde_json::Value::as_u64)).sum())
+    .unwrap_or(0);
+  let sets = m.get("tiles").and_then(|t| t.get("sets")).and_then(|s| s.as_array());
+  let tile_bytes = sets
+    .map(|s| {
+      s.iter()
+        .filter_map(|set| set.get("bytes").or_else(|| set.get("size")).and_then(serde_json::Value::as_u64))
+        .sum()
+    })
+    .unwrap_or(0);
+  let mut tile_datasets: Vec<String> = Vec::new();
+  for set in sets.map(Vec::as_slice).unwrap_or(&[]) {
+    if let Some(d) = set.get("dataset").and_then(|d| d.as_str()) {
+      if !tile_datasets.iter().any(|have| have == d) {
+        tile_datasets.push(d.to_string());
+      }
+    }
+  }
+  let tiles_age_days = tile_datasets
+    .iter()
+    .filter_map(|d| dataset_stamp(d))
+    .filter_map(|s| age_days(s, now_secs))
+    .max();
+  ReleaseData {
+    version: version.to_string(),
+    is_live,
+    db_age_days: db_snapshot.as_deref().and_then(|s| age_days(s, now_secs)),
+    db_snapshot,
+    db_bytes,
+    tile_sets: sets.map(|s| s.len()).unwrap_or(0),
+    tile_bytes,
+    tile_datasets,
+    tiles_age_days,
+  }
+}
+
 /// Everything the Release panel shows.
 pub fn plan(
   dev_root: &Path,
@@ -125,6 +229,7 @@ pub fn plan(
   launcher_live: Option<String>,
   launcher_commit: Option<String>,
   api_live: Option<String>,
+  data: Option<ReleaseData>,
 ) -> ReleasePlan {
   let docker = docker_running();
   let scripts = mcp_repo.join("scripts").join("release_pack.ps1").is_file()
@@ -157,7 +262,7 @@ pub fn plan(
   } else {
     None
   };
-  ReleasePlan { docker, online, scripts, items, blocked }
+  ReleasePlan { docker, online, scripts, items, blocked, data }
 }
 
 /// The Release console's buffer: filled by the running release, read by the window.
@@ -446,6 +551,51 @@ pub fn next_launcher(live: &str) -> Option<String> {
 mod tests {
   use super::*;
 
+  #[test]
+  fn the_pack_says_how_old_the_data_it_carries_is() {
+    // 2026-10-01, the day this was written, as unix seconds.
+    let now = days_from_civil(2026, 10, 1) * 86_400;
+    assert_eq!(age_days("20261001T000000Z", now), Some(0), "today");
+    assert_eq!(age_days("20260921T125618Z", now), Some(10), "the real 0.72.0 seed");
+    assert_eq!(age_days("20260423", now), Some(161), "the real basemap extract");
+    // Leap day, and a year boundary: the arithmetic is the whole point of this test.
+    assert_eq!(age_days("20260228", now), Some(215));
+    assert_eq!(age_days("20251231", now), Some(274));
+    // Nonsense must not become a date.
+    assert_eq!(age_days("", now), None);
+    assert_eq!(age_days("2026", now), None);
+    assert_eq!(age_days("20261301", now), None, "month 13");
+    assert_eq!(age_days("latest", now), None);
+
+    assert_eq!(dataset_stamp("protomaps_20260423"), Some("20260423"));
+    assert_eq!(dataset_stamp("planet_heightmap"), None, "undated: it does not move");
+
+    // A manifest shaped like the real one.
+    let m: serde_json::Value = serde_json::json!({
+      "db": { "snapshot": "20260921T125618Z",
+              "files": [ {"size": 1000}, {"size": 2000} ] },
+      "tiles": { "sets": [
+        {"style": "dark", "dataset": "protomaps_20260423", "bytes": 10},
+        {"style": "dark_v2", "dataset": "protomaps_20260423", "bytes": 20},
+        {"style": "heightmap", "dataset": "planet_heightmap", "bytes": 70}
+      ]}
+    });
+    let d = data_from_manifest(&m, "0.72.0", true, now);
+    assert_eq!(d.db_bytes, 3000);
+    assert_eq!(d.db_age_days, Some(10));
+    assert_eq!(d.tile_sets, 3);
+    assert_eq!(d.tile_bytes, 100);
+    // Deduplicated, and the undated set does not drag the age to None.
+    assert_eq!(d.tile_datasets, vec!["protomaps_20260423".to_string(), "planet_heightmap".to_string()]);
+    assert_eq!(d.tiles_age_days, Some(161));
+
+    // A manifest with no tiles at all must not panic or invent numbers.
+    let empty = data_from_manifest(&serde_json::json!({}), "0.1.0", false, now);
+    assert_eq!(empty.tile_sets, 0);
+    assert_eq!(empty.db_bytes, 0);
+    assert_eq!(empty.db_age_days, None);
+  }
+
   #[test]
   fn the_next_version_moves_the_right_place() {
     // A pack is a minor (0.71.0 -> 0.72.0); the launcher is a patch (0.1.38 -> 0.1.39).

src-tauri/tauri.conf.json

@@ -1,7 +1,7 @@
 {
   "$schema": "../node_modules/@tauri-apps/cli/config.schema.json",
   "productName": "ODIAN Launcher",
-  "version": "0.1.42",
+  "version": "0.1.43",
   "identifier": "fr.odian.launcher",
   "build": {
     "frontendDist": "../dist",