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

packages/naros-identity/prerm

@@ -0,0 +1,28 @@
+#!/bin/sh
+# Deregister the identity shim from /etc/ld.so.preload before its files are removed
+# (NAROS.md §2.3), so the loader never names a library that is no longer on disk.
+#
+# Runs on remove/deconfigure only: on `upgrade` the entry must persist, since the
+# replacement .so lands at the same path and the new postinst is a no-op.
+set -e
+
+LIB=/usr/lib/naros/libnaros-uname.so
+PRELOAD=/etc/ld.so.preload
+TMP="$PRELOAD.naros-tmp"
+
+case "$1" in
+  remove | deconfigure)
+    [ -f "$PRELOAD" ] || exit 0
+    # grep exits 1 when nothing survives the filter; that is the empty case, not an error.
+    grep -vxF "$LIB" "$PRELOAD" > "$TMP" || true
+    if [ -s "$TMP" ]; then
+      chmod 0644 "$TMP"
+      mv "$TMP" "$PRELOAD"
+    else
+      # An empty ld.so.preload is legal but pointless — drop the file entirely.
+      rm -f "$TMP" "$PRELOAD"
+    fi
+    ;;
+esac
+
+exit 0