Merge nucleic/gentle-willow-quail-cjp3 into dev

packages/naros-identity/postinst

@@ -0,0 +1,35 @@
+#!/bin/sh
+# Register the identity shim in /etc/ld.so.preload (NAROS.md §2.3).
+#
+# Idempotent, and additive rather than authoritative: the file is rewritten preserving any
+# other entries, so this package never owns unrelated preloads. The write goes through a
+# temp file + rename because /etc/ld.so.preload is read by the loader on EVERY exec — a
+# partially written list would be observed by whatever runs during the write.
+set -e
+
+LIB=/usr/lib/naros/libnaros-uname.so
+PRELOAD=/etc/ld.so.preload
+TMP="$PRELOAD.naros-tmp"
+
+case "$1" in
+  configure)
+    # Belt and braces: never point the loader at a library that is not on disk.
+    if [ ! -f "$LIB" ]; then
+      echo "naros-identity: $LIB missing, not registering preload" >&2
+      exit 0
+    fi
+    if [ -f "$PRELOAD" ] && grep -qxF "$LIB" "$PRELOAD"; then
+      exit 0
+    fi
+    if [ -f "$PRELOAD" ]; then
+      cat "$PRELOAD" > "$TMP"
+    else
+      : > "$TMP"
+    fi
+    echo "$LIB" >> "$TMP"
+    chmod 0644 "$TMP"
+    mv "$TMP" "$PRELOAD"
+    ;;
+esac
+
+exit 0