Add script for mass-converging

E.g. just the new users recipe

scripts/knife/converge_all.sh

@@ -0,0 +1,70 @@
+#!/usr/bin/env bash
+#
+# Converge every node in nodes/ with a runlist override (-o).
+#
+# Usage:
+#   ./converge_all.sh "recipe[kosmos-base::users]"
+#
+# Port selection per node:
+#   - nodes WITH a normal.vm_host attribute (KVM guests):  port 22
+#   - nodes WITHOUT a normal.vm_host attribute (bare metal): port 2222
+#
+# Runs sequentially and aborts on the first failure (set -euo pipefail).
+
+set -euo pipefail
+
+if [[ $# -ne 1 ]]; then
+  echo "Usage: $0 '<runlist override>'" >&2
+  echo "  e.g. $0 \"recipe[kosmos-base::users]\"" >&2
+  exit 1
+fi
+
+RUNLIST="$1"
+
+shopt -s nullglob
+nodes=( nodes/*.json )
+
+if [[ ${#nodes[@]} -eq 0 ]]; then
+  echo "No nodes found in nodes/" >&2
+  exit 1
+fi
+
+total=${#nodes[@]}
+i=0
+
+for f in "${nodes[@]}"; do
+  i=$((i + 1))
+
+  IFS=$'\x1f' read -r node_name vm_host knife_host < <(python3 -c '
+import json, sys
+d = json.load(open(sys.argv[1]))
+print("\x1f".join([
+    d.get("name", "") or "",
+    d.get("normal", {}).get("vm_host", "") or "",
+    d.get("normal", {}).get("knife_zero", {}).get("host", "") or "",
+]))
+' "$f")
+
+  if [[ -z "$node_name" ]]; then
+    echo "[$i/$total] $f: could not read node name, skipping" >&2
+    exit 1
+  fi
+
+  if [[ -z "$knife_host" ]]; then
+    echo "[$i/$total] $node_name: no knife_zero.host set, skipping" >&2
+    exit 1
+  fi
+
+  if [[ -n "$vm_host" ]]; then
+    port=22
+    label="vm_host=${vm_host}"
+  else
+    port=2222
+    label="bare metal"
+  fi
+
+  echo "[$i/$total] $node_name ($label, port ${port}, host ${knife_host})"
+  knife zero converge "name:${node_name}" -a knife_zero.host -p"${port}" -o "${RUNLIST}"
+done
+
+echo "Converged ${total} node(s) successfully."