Script to renew every host's gateway session over SSH

scripts/renew-hosts.sh

@@ -0,0 +1,61 @@
+#!/usr/bin/env bash
+# Renews the gateway's T3 sessions, which last 30 days and cannot be refreshed. For each host it
+# makes a one-time pairing credential on that host and hands it straight to `wristcode host add`
+# on the gateway, so the credential is never printed. Run it from a machine that can SSH to every
+# host by name. The watch warns a week before a session expires.
+#
+#   scripts/renew-hosts.sh              renew every host below
+#   scripts/renew-hosts.sh "Mac mini"   renew one host by label
+set -euo pipefail
+
+GATEWAY_SSH="${GATEWAY_SSH:-server.gib}"
+GATEWAY_CONTAINER="${GATEWAY_CONTAINER:-wristcode-gateway}"
+
+# label | SSH host, or "local" for the machine running this script | public T3 URL
+HOSTS=(
+  "Desktop|local|https://t3desktop.gbrown.org"
+  "Mac mini|mac.gib|https://t3mac.gbrown.org"
+  "server-gib|server.gib|https://t3sr.gbrown.org"
+  "LittleMan|junior.gib|https://t3jr.gbrown.org"
+)
+
+# Prints a pairing credential. Runs on the T3 host. The CLI is not on PATH in non-login shells,
+# so it looks where T3 Code installs it.
+MINT='
+set -e
+export T3CODE_HOME="${T3CODE_HOME:-$HOME/.t3}"
+for candidate in "$(command -v t3 || true)" "$HOME/.t3/bin/t3" "$HOME/.local/bin/t3" $(ls -d "$HOME"/.t3/runtime/versions/*/t3 2>/dev/null | sort -V -r); do
+  if [ -n "$candidate" ] && [ -x "$candidate" ]; then t3="$candidate"; break; fi
+done
+[ -n "${t3:-}" ] || { echo "no t3 CLI found" >&2; exit 1; }
+"$t3" auth pairing create --scope orchestration:read --scope orchestration:operate \
+  --label "WristCode gateway" --ttl 10m --json |
+  sed -n "s/.*\"credential\": *\"\\([^\"]*\\)\".*/\\1/p"
+'
+
+renew() {
+  local label="$1" ssh_host="$2" url="$3" credential
+  if [ "$ssh_host" = "local" ]; then
+    credential="$(bash -c "$MINT")"
+  else
+    credential="$(ssh -o BatchMode=yes "$ssh_host" "bash -s" <<<"$MINT")"
+  fi
+  if [ -z "$credential" ]; then
+    echo "$label: could not make a pairing credential" >&2
+    return 1
+  fi
+  # The credential travels on stdin, not on a command line other processes could read.
+  ssh -o BatchMode=yes "$GATEWAY_SSH" \
+    "read -r credential && docker exec $GATEWAY_CONTAINER wristcode host add '$url' \"\$credential\" --label '$label'" \
+    <<<"$credential"
+}
+
+failed=0
+for entry in "${HOSTS[@]}"; do
+  IFS='|' read -r label ssh_host url <<<"$entry"
+  if [ $# -gt 0 ] && [ "$1" != "$label" ]; then continue; fi
+  renew "$label" "$ssh_host" "$url" || failed=1
+done
+
+ssh -o BatchMode=yes "$GATEWAY_SSH" "docker exec $GATEWAY_CONTAINER wristcode host list" | cut -f1,4
+exit "$failed"