Fix/generations quoting style

package/contents/tools/sh/generations

@@ -1,9 +1,13 @@
 #!/usr/bin/env bash
-# Emit: active-store-path, booted-store-path, then one stat line per system-N-link,
+# Emit: active-store-path, booted-store-path, then one line per system-N-link,
 # then "current <store-path>" when /run/current-system resolves.
+# Link lines are: <stat %y> '<link>' -> '<target>'. The target comes from readlink rather than
+# stat's %N, whose quoting varies with QUOTING_STYLE and the installed coreutils (#44).
 readlink -f /nix/var/nix/profiles/system 2>/dev/null
 readlink -f /run/booted-system 2>/dev/null
-find /nix/var/nix/profiles -maxdepth 1 -name 'system-*-link' -type l \
-    -exec stat --format='%y %N' {} + 2>/dev/null
+for link in /nix/var/nix/profiles/system-*-link; do
+    [ -L "$link" ] || continue
+    printf "%s '%s' -> '%s'\n" "$(stat --format=%y "$link" 2>/dev/null)" "$link" "$(readlink "$link")"
+done
 current=$(readlink -e /run/current-system 2>/dev/null) && echo "current $current"
 exit 0

package/contents/ui/Engine.qml

@@ -2570,7 +2570,7 @@ Item {
                 currentPath = lines[i].slice(8).trim();
                 continue;
             }
-            const m = lines[i].match(/^([\d-]+ [\d:]+)\.\d+ [+-]\d+ '([^']*system-(\d+)-link)' -> '([^']+)'/);
+            const m = lines[i].match(/^([\d-]+ [\d:]+)(?:\.\d+)?(?: [+-]\d+)? '([^']*system-(\d+)-link)' -> '([^']+)'/);
             if (!m)
                 continue;
             const genNum = parseInt(m[3]);
@@ -2592,7 +2592,8 @@ Item {
 
         list.sort((a, b) => b.number - a.number);
         // `nixos-rebuild test` / `nh os test` activate a closure without registering a generation.
-        root.runningTestBuild = currentPath !== "" && !list.some(g => g.storePath === currentPath);
+        // An empty list means parsing failed, not a test build.
+        root.runningTestBuild = currentPath !== "" && list.length > 0 && !list.some(g => g.storePath === currentPath);
         // Keep the preceding closure even when the displayed history is limited.
         for (let i = 0; i + 1 < list.length; ++i) {
             list[i].previousNumber = list[i + 1].number;

tests/tst_Engine.qml

@@ -637,6 +637,15 @@ Item {
             compare(core.bootedGenNum, -1);
             verify(!core.runningTestBuild, "An unresolvable current-system is not a test build");
         }
+        function test_parse_generations_without_link_lines_is_not_a_test_build() {
+            core.parseGenerations(["/nix/store/162-sys", "/nix/store/162-sys", "current /nix/store/162-sys"].join("\n"));
+            compare(core.generations.length, 0);
+            verify(!core.runningTestBuild, "no parsed generations means a parse failure, not a test build");
+        }
+        function test_parse_generations_accepts_stat_without_fraction_or_zone() {
+            core.parseGenerations(["/nix/store/7-sys", "/nix/store/7-sys", "2026-10-11 12:39:05 '/nix/var/nix/profiles/system-7-link' -> '/nix/store/7-sys'"].join("\n"));
+            compare(core.activeGenNum, 7);
+        }
         function test_terminal_completion_tracks_exit_not_generations() {
             core.runCustomCommand("false", "Test");
             verify(core.isBusy);