Add Docker support

.gitignore

@@ -0,0 +1,4 @@
+.DS_Store
+.vscode/
+.idea/
+config/

Dockerfile

@@ -0,0 +1,7 @@
+FROM alpine:latest
+
+RUN apk add --update --no-cache bash curl yq
+
+COPY d2c.sh /usr/local/bin
+
+ENTRYPOINT ["/usr/local/bin/d2c.sh"]

README.md

@@ -35,6 +35,11 @@ ipv6 = true
 
 When d2c.sh is run, it will process each `*.toml` TOML file in the `/etc/d2c/` directory, updating the records configured in each with the current public IP of the machine. The A / AAAA records must be created from the Cloudflare dashboard first; then d2c.sh will be able to update them with the server's public IP. Make sure to create the correct type of record (A or AAAA) according to IPv4 or IPv6, as d2c.sh will ignore misconfigured records.
 
+### Notifications
+
+If the `APPRISE_SIDECAR_URL` environment variable is set, a notification will be sent out to the
+specified [Apprise](https://github.com/caronc/apprise-api) service when a record is updated or if a failure is encountered.
+
 ### Usage
 
 ```sh
@@ -139,3 +144,11 @@ bash <(curl -s https://raw.githubusercontent.com/ddries/d2c.sh/master/d2c.sh)
 
 $ crontab -e # set cronjob to run periodically
 ```
+
+### Method 3: Docker
+
+To run this script in Docker, build the image with the Dockerfile in the repo.
+
+See `docker-compose.yml` for an example config.
+
+Note: you will need to find a way to run it periodically (e.g. [swarm-cronjob](https://github.com/crazy-max/swarm-cronjob) in Swarm mode).

d2c.sh

@@ -36,6 +36,14 @@ print_usage() {
 '
 }
 
+send_notification() {
+    if [[ "${APPRISE_SIDECAR_URL}" != "" ]]; then
+        status=$(curl --no-progress-meter -X POST -H "Content-Type: application/json" \
+            --data "{\"title\": \"$1\", \"body\": \"$2\", \"type\": \"$3\"}" "${APPRISE_SIDECAR_URL}")
+        echo "Sending notification: $status"
+    fi
+}
+
 # print usage if requested
 if [ "$1" = "help" ] || [ "$1" = "--help" ] || [ "$1" = "-h" ]; then
     print_usage
@@ -114,7 +122,7 @@ for config_file in $(ls ${config_file_dir}*.toml 2>/dev/null | sort -V); do
             if [ "$name" = "$c_name" ] && [ "$type" = "$c_type" ]; then
                 if [ "$public_ip" != "$content" ]; then
                     # update DNS
-                    curl --silent --request PATCH \
+                    result_json=$(curl --no-progress-meter --request PATCH \
                     --url "${cloudflare_base}/zones/${zone_id}/dns_records/${id}" \
                     --header 'Content-Type: application/json' \
                     --header "Authorization: Bearer ${api_key}" \
@@ -125,9 +133,17 @@ for config_file in $(ls ${config_file_dir}*.toml 2>/dev/null | sort -V); do
                         "type": "'${c_type}'",
                         "comment": "Managed by d2c.sh",
                         "ttl": '${ttl}'
-                    }' > /dev/null
-
-                    echo "[d2c.sh] OK: ${name}"
+                    }')
+                    update_successful=$(echo "$result_json" | grep -o '"success": *[^,}]*' | awk -F':' '{print $2}')
+
+                    if [ "$update_successful" == "true" ]; then
+                        echo "[d2c.sh] OK: ${name}"
+                        send_notification "[d2c.sh] DNS updated" "Updated successfully: ${name}" "success"
+                    else
+                        echo "[d2c.sh] Failure: ${name}"
+                        echo $result_json
+                        send_notification "[d2c.sh] DNS update error" "Failed to update: ${name}" "failure"
+                    fi
                 else
                     echo "[d2c.sh] ${name} did not change"
                 fi

docker-compose.yml

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+services:
+  d2c.sh:
+    build: .
+    container_name: d2c.sh
+    volumes:
+      - /config:/etc/d2c:ro
+    environment:
+      - APPRISE_SIDECAR_URL=http://apprise:8000/notify
+    depends_on:
+      - apprise
+
+  apprise:
+    image: caronc/apprise
+    container_name: apprise
+    environment:
+      - APPRISE_STATELESS_URLS=${DISCORD_WEBHOOK} # example
+      - APPRISE_STATEFUL_MODE=disabled
+      - APPRISE_WORKER_COUNT=1