Auto discover internal WebRTC candidate for add-on (#5089)

* Auto discover internal WebRTC candidate for add-on

* Write logs to stderr

* Fix port number

* Integrate with newest changes

* Update docs

* Use local variable more

* Use Python to write file, fix JSON->YAML

* Store into variable

* Update docs/docs/configuration/live.md

Co-authored-by: Nicolas Mowen <nickmowen213@gmail.com>

* Update docs/docs/configuration/live.md

Co-authored-by: Nicolas Mowen <nickmowen213@gmail.com>

* Update docs/docs/configuration/live.md

* Update docs/docs/configuration/live.md

* Refator s6 scripts to the new format

* Remove unneeded workaround

* Update docker/rootfs/usr/local/go2rtc/create_config.py

* Migrate logging to new s6 format

* Remove more unnecessary s6 variables

* Fix prepare-log and when go2rtc is not present in config

* Restart the whole container if either Frigate or go2rtc fails

* D

* Fix service name in finish

* Fix nginx finish comment

* Restart improvements

* Fix devcontainer

* Fix format

* Update Dockerfile

Co-authored-by: Felipe Santos <felipecassiors@gmail.com>

* Improve scripts logging

Co-authored-by: Nicolas Mowen <nickmowen213@gmail.com>

docker/rootfs/etc/s6-overlay/s6-rc.d/go2rtc/run

@@ -7,8 +7,54 @@ set -o errexit -o nounset -o pipefail
 # Tell S6-Overlay not to restart this service
 s6-svc -O .
 
+function get_ip_and_port_from_supervisor() {
+    local ip_address
+    # Example: 192.168.1.10/24
+    local ip_regex='^([0-9]{1,3}\.{3}[0-9]{1,3})/[0-9]{1,2}$'
+    if ip_address=$(
+        curl -fsSL \
+            -H "Authorization: Bearer ${SUPERVISOR_TOKEN}" \
+            -H "Content-Type: application/json" \
+            http://supervisor/network/interface/default/info |
+            jq --exit-status --raw-output '.data.ipv4.address[0]'
+    ) && [[ "${ip_address}" =~ ${ip_regex} ]]; then
+        ip_address="${BASH_REMATCH[1]}"
+        echo "[INFO] Got IP address from supervisor: ${ip_address}" >&2
+    else
+        echo "[WARN] Failed to get IP address from supervisor" >&2
+        return 0
+    fi
+
+    local webrtc_port
+    local port_regex='^([0-9]{1,5})$'
+    if webrtc_port=$(
+        curl -fsSL \
+            -H "Authorization: Bearer ${SUPERVISOR_TOKEN}" \
+            -H "Content-Type: application/json" \
+            http://supervisor/addons/self/info |
+            jq --exit-status --raw-output '.data.network["22/tcp"]'
+    ) && [[ "${webrtc_port}" =~ ${port_regex} ]]; then
+        webrtc_port="${BASH_REMATCH[1]}"
+        echo "[INFO] Got WebRTC port from supervisor: ${ip_address}" >&2
+    else
+        echo "[WARN] Failed to get WebRTC port from supervisor" >&2
+        return 0
+    fi
+
+    export FRIGATE_GO2RTC_WEBRTC_CANDIDATE_INTERNAL="${ip_address}:${webrtc_port}"
+}
+
+echo "[INFO] Preparing go2rtc config..." >&2
+
+if [[ -n "${SUPERVISOR_TOKEN:-}" ]]; then
+    # Running as a Home Assistant add-on, infer the IP address and port
+    get_ip_and_port_from_supervisor
+fi
+
 raw_config=$(python3 /usr/local/go2rtc/create_config.py)
 
+echo "[INFO] Starting go2rtc..." >&2
+
 # Replace the bash process with the go2rtc process, redirecting stderr to stdout
 exec 2>&1
 exec go2rtc -config="${raw_config}"