Reloads nginx after substituting environment variables

Dockerfile

@@ -14,7 +14,7 @@ RUN npm install && \
     npm run build:$build_config
 
 ### STAGE 2: Run ###
-FROM nginx:alpine as runtime
+FROM nginx:alpine
 RUN set -x && apk add --update --no-cache bash libintl gettext curl
 
 COPY --from=builder /crc-bpmn/dist/* /etc/nginx/html/
@@ -24,11 +24,14 @@ COPY --from=builder /crc-bpmn/nginx.conf /etc/nginx/conf.d/default.conf
 COPY ./docker/substitute-env-variables.sh ./entrypoint.sh
 RUN chmod +x ./entrypoint.sh
 
-# Substitute environment variables in nginx configuration and index.html
+# The entrypoint.sh script will run after the container finishes starting.
+# Substitutes environment variables in nginx configuration and index.html,
+# then reloads nginx.
 ENTRYPOINT ["./entrypoint.sh", \
             "/etc/nginx/html/index.html,/etc/nginx/conf.d/default.conf", \
             "PRODUCTION,API_URL,IRB_URL,HOME_ROUTE,BASE_HREF,PORT0", \
-            "/etc/nginx/html"]
+            "/etc/nginx/html", \
+            "true"]
 
 ### STAGE 3: Profit! ###
-CMD ["nginx", "-s", "reload"]
+CMD ["nginx", "-g", "daemon off;"]

docker/docker-compose.yml

@@ -62,21 +62,21 @@ services:
       - "5000:5000"
     command: ./wait-for-it.sh pb:5001 -t 0 -- ./docker_run.sh
 
-#  # Uncomment for debugging
+  # Uncomment for debugging
-#  bpmn:
+  bpmn:
-#    container_name: bpmn
+    container_name: bpmn
-#    depends_on:
+    depends_on:
-#       - db
+       - db
-#       - pb
+       - pb
-#       - ldap
+       - ldap
-#       - backend
+       - backend
-#    image: sartography/cr-connect-bpmn:$E2E_TAG
+    image: sartography/cr-connect-bpmn:$E2E_TAG
-#    environment:
+    environment:
-#      - API_URL=http://localhost:5000/v1.0
+      - API_URL=http://localhost:5000/v1.0
-#      - BASE_HREF=/bpmn
+      - BASE_HREF=/bpmn
-#      - HOME_ROUTE=home
+      - HOME_ROUTE=home
-#      - IRB_URL=http://localhost:5001/
+      - IRB_URL=http://localhost:5001/
-#      - PORT0=5002
+      - PORT0=5002
-#      - PRODUCTION=false
+      - PRODUCTION=false
-#    ports:
+    ports:
-#      - "5002:5002"
+      - "5002:5002"

docker/substitute-env-variables.sh

@@ -6,26 +6,40 @@
 # $1: Comma-delimited list of file paths
 # $2: Comma-delimited list of environment variables
 # $3: Absolute path to nginx html directory (optional)
+# $4: Should restart nginx (optional)
 #####################################################################
 
 echo 'Substituting environment variables...'
+num_args=0
 
 # The first parameter is a comma-delimited list of paths to files which should be substituted
 if [[ -z $1 ]]; then
   echo 'ERROR: No target files given.'
   exit 1
+else
+  num_args=1
 fi
 
 # The second parameter is a comma-delimited list of environment variable names
 if [[ -z $2 ]]; then
   echo 'ERROR: No environment variables given.'
   exit 1
+else
+  num_args=2
 fi
 
 # The third parameter is the absolute path to the nginx html directory
-if [[ -z $2 ]]; then
+if [[ -z $3 ]]; then
-  echo 'ERROR: No path to nginx html directory given.'
+  echo ''  # It's optional. Don't print anything.
-  exit 1
+else
+  num_args=3
+fi
+
+# The fourth parameter, if 'true', is whether we should reload nginx
+if [[ -z $4 ]]; then
+  echo ''  # It's optional. Don't print anything.
+else
+  num_args=4
 fi
 
 # Add trailing slash to $BASE_HREF if needed
@@ -35,7 +49,7 @@ if [[ "$2" == *"BASE_HREF"* ]]; then
   [[ $last_char != "/" ]] && BASE_HREF="$BASE_HREF/"; :
 
   # The third parameter is the absolute path to the nginx html directory
-  if [[ $# -ge 3 ]]; then
+  if [[ $num_args -ge 3 ]]; then
     # Replace all instances of __REPLACE_ME_WITH_BASE_HREF__ with $BASE_HREF
     find "$3" \( -type d -name .git -prune \) -o -type f -print0 | \
       xargs -0 sed -i 's@__REPLACE_ME_WITH_BASE_HREF__@'"$BASE_HREF"'@g'
@@ -71,11 +85,18 @@ do
   echo "$env_var = ${!env_var}"
 done
 
-# Execute all other commands with parameters
+# Reload nginx
-if [[ $# -gt 3 ]]; then
+if [ $num_args -ge 4 ] && [ "$4" == "true" ]; then
-  exec "${@:4}"
+  # Check to see if nginx command is available
+  if hash nginx 2> /dev/null; then
+    echo "Reloading nginx..."
+    exec nginx -s reload
+    echo "nginx reloaded."
   else
-  if [[ $# -gt 2 ]]; then
+    echo "nginx command not found on this system."
-    exec "${@:3}"
   fi
 fi
+
+# Execute all other commands with parameters
+num_args=$((num_args + 1))
+exec "${@:num_args}"