chore: create template substitution variables with shell

.docker/build.sh

@@ -1,12 +1,17 @@
 #!/bin/sh
 
-# YOU DON'T NEED TO EDIT THIS FILE. IF YOU WANT TO SET
-# CUSTOM ENVIRONMENT VARIABLES, USE THE 'DOCKERFILE IMAGE'
-# FROM ROOT DIRECTORY AND PASS THE ENVIRONMENT PARAMETERS
+# YOU DON'T NEED TO EDIT THIS FILE. IF YOU WANT TO SET CUSTOM ENVIRONMENT VARIABLES,
+# USE THE 'DOCKERFILE IMAGE' FROM ROOT DIRECTORY AND PASS THE ENVIRONMENT PARAMETERS
 
 # This variable changes the behavior of the image builder to remove the base image
 export DOCKER_BUILDKIT=1
 
+# These templates will be used to create configuration files that incorporate values from environment variables
+# If these locations do not already exist within the Docker container, they will be created
+export CONFIG_PHP_TEMPLATE="$(pwd)/templates/config.php"
+export CONFIG_NGINX_TEMPLATE="$(pwd)/templates/nginx.conf"
+export CONFIG_OPEN_SEARCH_TEMPLATE="$(pwd)/templates/opensearch.xml"
+
 # Configure 'opensearch.xml' with Librex configuration metadata, such as the encoding and the host that stores the site
 # These configurations will replace the 'opensearch.xml' inside '.dockers/templates' for the best setup for your instance
 export OPEN_SEARCH_TITLE="${OPEN_SEARCH_TITLE:-'LibreX'}"
@@ -52,3 +57,12 @@ export CURLOPT_CUSTOMREQUEST="${CURLOPT_CUSTOMREQUEST:-'GET'}"
 export CURLOPT_MAXREDIRS=${CURLOPT_MAXREDIRS:-5}
 export CURLOPT_TIMEOUT=${CURLOPT_TIMEOUT:-18}
 export CURLOPT_VERBOSE=${CURLOPT_VERBOSE:-false}
+
+# The lines below will replace the environment variables in the templates with the corresponding variables listed above. To accomplish this, the GNU 'envsubst' package will be used
+# Although not recommended (if you do not know what you are doing), you still have the option to add new substitution file templates using any required environment variables
+[[ ! -s ${CONFIG_PHP_TEMPLATE} ]] && cat '$(pwd)/config.php' | envsubst | AwkTrim > ${CONFIG_PHP_TEMPLATE}
+[[ ! -s ${CONFIG_NGINX_TEMPLATE} ]] && cat '$(pwd)/nginx.conf' | envsubst | AwkTrim > ${CONFIG_NGINX_TEMPLATE}
+[[ ! -s ${CONFIG_OPEN_SEARCH_TEMPLATE} ]] && cat '$(pwd)/opensearch.xml' | envsubst | AwkTrim > ${CONFIG_OPEN_SEARCH_TEMPLATE}
+
+# These shell functions will be available for use by any function calls
+function AwkTrim() { awk '{$1=$1};1' }

.docker/entrypoint.sh

@@ -1,2 +1,2 @@
 #!/bin/sh
-exec sleep infinity
+exec sleep infinity

Dockerfile

@@ -80,9 +80,9 @@ RUN   chmod u+x "scripts/entrypoint.sh" &&\
 # Compress Librex files, excluding the '.docker' folder containing scripts and the Dockerfile, using the previously downloaded zip package
 # Delete all files in the root directory, except for the '.docker' and 'tmp' folders, which are created exclusively to be handled by Docker
 RUN   apk update; apk add zip --no-cache &&\
-      rm -rf .git; mkdir -p "tmp/zip" &&\
+      rm -rf .git; mkdir -p "{tmp,templates}/zip" &&\
       zip -r "tmp/zip/librex.zip" . -x "scripts/**\*" "Dockerfile\*" &&\
-      find -maxdepth 1 ! -name "scripts" ! -name "tmp" ! -name "." -exec rm -rv {} \; &&\
+      find -maxdepth 1 ! -name "scripts" ! -name "tmp" ! -name "templates" ! -name "." -exec rm -rv {} \; &&\
       apk del -r zip;
 
 # Configures the container to be run as an executable.