Add Cloudflare DDNS updater scripts and systemd configurations

dyndns/git-sync.sh

@@ -0,0 +1,29 @@
+#!/usr/bin/env bash
+# git-sync.sh - pull changes and run deploy.sh if updated
+set -euo pipefail
+
+REPO_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+cd "${REPO_DIR}"
+
+git fetch --all --prune
+
+UPDATED=0
+if git rev-parse --abbrev-ref --symbolic-full-name @{u} >/dev/null 2>&1; then
+  LOCAL="$(git rev-parse @)"
+  REMOTE="$(git rev-parse @{u})"
+  if [ "${LOCAL}" != "${REMOTE}" ]; then
+    UPDATED=1
+  fi
+else
+  out="$(git pull --rebase 2>&1 || true)"
+  if ! echo "${out}" | grep -q "Already up"; then
+    UPDATED=1
+  fi
+fi
+
+if [ "${UPDATED}" -eq 1 ]; then
+  echo "$(date -Iseconds) Repo updated -> running deploy.sh"
+  "${REPO_DIR}/deploy.sh"
+else
+  echo "$(date -Iseconds) Repo unchanged"
+fi