Docker: add TEMPLATES_DIR argument

docker/README.md

@@ -87,6 +87,17 @@ docker run \
     pierky/arouteserver:latest
 ```
 
+In case custom templates are used to generate the final configurations, it's possible to pass the `TEMPLATES_DIR` environment variable to the container and set it to a custom path (on the container side) where the local directory containing the customized files is mounted:
+
+```bash
+docker run \
+    ...
+    -e TEMPLATES_DIR="/custom_templates" \
+    -v /path/to/local/templates/directory:/custom_templates:ro
+```
+
+The local directory (*/path/to/local/templates/directory* in the example above) must have the same structure of the official *templates* directory (so, with sub-directories like *bird*, *openbgpd*, *html*, *md*, ...).
+
 ### Textual representation
 
 A [textual representation](https://arouteserver.readthedocs.io/en/latest/USAGE.html#textual-representation) of the route server's options and policies will be generated automatically before the route server configuration is generated if the directory `/root/arouteserver_html` exists on the container.

docker/run.sh

@@ -28,6 +28,7 @@ LOCAL_PREFIXES="${LOCAL_PREFIXES}"
 IP_VER="${IP_VER}"
 LOCAL_FILES="${LOCAL_FILES}"
 LOCAL_FILES_DIR="${LOCAL_FILES_DIR}"
+TEMPLATES_DIR="${TEMPLATES_DIR}"
 EURO_IX_URL="${EURO_IX_URL}"
 EURO_IX_IXP_ID="${EURO_IX_IXP_ID}"
 
@@ -42,6 +43,13 @@ if [[ ! -e "${OUTPUT_DIR}" && ! -d "${OUTPUT_DIR}" ]]; then
           You can run the container passing the '-v PATH_OF_DIRECTORY_ON_THE_HOST:${OUTPUT_DIR}' argument."
 fi
 
+if [[ -n "${TEMPLATES_DIR}" ]]; then
+    if [[ ! -e "${TEMPLATES_DIR}" ]]; then
+        error "Couldn't find the directory ${TEMPLATES_DIR} on the container.\n
+               Please mount the local directory where the templates are stored using '-v PATH_OF_TEMPLATES_DIR_ON_THE_HOST:${TEMPLATES_DIR}:ro' argument."
+    fi
+fi
+
 TEST_WRITABLE_FILE="${OUTPUT_DIR}/.test_dir_is_writable"
 
 set +e
@@ -193,10 +201,17 @@ if [[ -n "${LOCAL_FILES}" ]]; then
     fi
 fi
 
+TEMPLATES_DIR_ARG=""
+
+if [[ -n "${TEMPLATES_DIR}" ]]; then
+    TEMPLATES_DIR_ARG="--templates-dir ${TEMPLATES_DIR}"
+fi
+
 OUTPUT_PATH="${OUTPUT_DIR}/${OUTPUT_FILE}"
 
 arouteserver \
     "${DAEMON}" \
+    ${TEMPLATES_DIR_ARG} \
     --target-version "${VERSION}" \
     ${IP_VER_ARG} \
     --clients "${CLIENTS_FILE_PATH}" \