Add util script for sanitizing nodes

Deletes the "override" and "default" properties, which may contain
sensitive data

scripts/util/sanitize_node.sh

@@ -0,0 +1,69 @@
+#!/usr/bin/env bash
+# Strip the top-level "override" and "default" attributes from Chef node JSON files.
+#
+# Usage:
+#   ./scripts/util/strip_node_attrs.sh <node> [<node> ...]
+#   ./scripts/util/strip_node_attrs.sh --all
+#
+# A <node> may be a bare node name (e.g. "prometheus-1"), a path relative to the
+# repository root (e.g. "nodes/prometheus-1.json"), or an absolute path.
+#
+# Exit codes:
+#   0 - all target files processed successfully
+#   1 - one or more targets could not be processed (missing args, missing jq,
+#       file not found, invalid JSON, or write failure)
+
+set -uo pipefail
+
+command -v jq >/dev/null 2>&1 || exit 1
+
+root="$(git rev-parse --show-toplevel 2>/dev/null)" || root="$(pwd)"
+
+targets=()
+if [ "$#" -eq 0 ]; then
+  exit 1
+fi
+
+for arg in "$@"; do
+  if [ "$arg" = "--all" ]; then
+    shopt -s nullglob
+    for f in "$root"/nodes/*.json; do
+      targets+=("$f")
+    done
+    shopt -u nullglob
+    continue
+  fi
+
+  if [[ "$arg" == */* ]]; then
+    if [[ "$arg" = /* ]]; then
+      targets+=("$arg")
+    else
+      targets+=("$root/$arg")
+    fi
+  else
+    targets+=("$root/nodes/$arg.json")
+  fi
+done
+
+if [ "${#targets[@]}" -eq 0 ]; then
+  exit 1
+fi
+
+rc=0
+for file in "${targets[@]}"; do
+  [ -f "$file" ] || { rc=1; continue; }
+
+  jq -e . "$file" >/dev/null 2>&1 || { rc=1; continue; }
+
+  tmp="$(mktemp "${file}.XXXXXX")" || { rc=1; continue; }
+  if jq --indent 2 'del(.override, .default)' "$file" > "$tmp" 2>/dev/null; then
+    truncate -s -1 "$tmp" 2>/dev/null || true
+    mv "$tmp" "$file" || { rm -f "$tmp"; rc=1; continue; }
+  else
+    rm -f "$tmp"
+    rc=1
+    continue
+  fi
+done
+
+exit "$rc"