initial commit

.env.example

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+BLOG_NAME=
+LIVERELOAD_PORT=
+HOST_URL=
+WWW_PORT=

.gitignore

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+.env
+jekyll/**

Dockerfile

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+FROM ruby:3.2.2
+
+ARG BLOG_NAME
+RUN useradd -ms /bin/bash --uid 1000 jekyll
+RUN mkdir -p -m 0755 /app/jekyll
+RUN mkdir -p -m 0755 /opt/jekyll
+VOLUME $PWD/data:/opt/jekyll
+RUN chmod +x /opt/jekyll/ && \
+  chown -R 1000:1000 /opt/jekyll && \
+  chown -R 1000:1000 /app
+
+USER 1000
+
+WORKDIR /app/jekyll
+
+ENTRYPOINT ["/opt/jekyll/entrypoint.sh"]

data/entrypoint.sh

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+#!/bin/bash
+source /opt/jekyll/.env
+export AUTHOR_EMAIL=$AUTHOR_EMAIL
+export BLOG_NAME=$BLOG_NAME
+export BASE_URL=$BASE_URL
+export URL=$URL
+export GITHUB_USERNAME=$GITHUB_USERNAME
+export LIVERELOAD_PORT=$LIVERELOAD_PORT
+export HOST_URL=$HOST_URL
+export SITE_TITLE=$SITE_TITLE
+export THEME=$THEME
+export TWITTER_USERNAME=$TWITTER_USERNAME
+export WWW_PORT=$WWW_PORT
+export GEM_HOME="/usr/local/bundle"
+export PATH="$GEM_HOME/bin:$GEM_HOME/gems/bin:$PATH"
+export SITE_PATH="/app/jekyll/$BLOG_NAME"
+
+update_config() {
+	for ENV_VAR in 'AUTHOR_EMAIL' 'BASE_URL' 'GITHUB_USERNAME' \
+		'SITE_TITLE' 'THEME' 'TWITTER_USERNAME' 'URL'; do
+		case $ENV_VAR in
+		"AUTHOR_EMAIL") param="email" ;;
+		"BASE_URL") param="baseurl" ;;
+		"GITHUB_USERNAME") param="github_username" ;;
+		"SITE_TITLE") param="title" ;;
+		"THEME") param="theme" ;;
+		"TWITTER_USERNAME") param="twitter_username" ;;
+		"URL") param="url" ;;
+		esac
+		initial_config=$(grep -E "^${param}: " ${SITE_PATH}/_config.yml)
+		[[ "$initial_config" != "$param: ${!ENV_VAR}" && ! -z ${!ENV_VAR} ]] && {
+			echo "Config change detected on $param: updating _config.yml"
+			echo "New $param: ${!ENV_VAR}"
+			[[ $ENV_VAR == "BASE_URL" || $ENV_VAR == "URL" ]] && {
+				sed -i "s/\(${param}: \).*/\1\"${!ENV_VAR}\"/g" ${SITE_PATH}/_config.yml
+			} || {
+				sed -i "s/\(${param}: \).*/\1${!ENV_VAR}/g" ${SITE_PATH}/_config.yml
+			}
+		} || {
+			echo "No change or empty variable for $param, continuing..."
+		}
+	done
+}
+
+update_description() {
+	initial_description=$(sed -n '/^description/,/^baseurl/p' ${SITE_PATH}/_config.yml | sed '/^description/d' |
+		sed '/^baseurl: ""/d' | sed 's/^[[:space:]]*//' | sed '/^description:/,/^baseurl:/ { /^description:/n; /^baseurl:/! { /^$/d; } }')
+	current_description=$(sed 's/^[[:space:]]*//' /opt/jekyll/${BLOG_NAME}_description.txt)
+	[[ "$initial_description" != "$current_description" && ! -z $current_description ]] && {
+		echo "Config change detected on site description: updating _config.yml"
+		sed -i "/^description/,/^baseurl:/!b;//!d;/^description/r /opt/jekyll/${BLOG_NAME}_description.txt" ${SITE_PATH}/_config.yml
+		sed -i '/^description:/,/^baseurl:/ { /^description:/n; /^baseurl:/! s/^[^[:space:]]/  &/; }' ${SITE_PATH}/_config.yml
+	} || {
+		echo "No change or empty variable for site $BLOG_NAME description, continuing..."
+		sed -i '/^description:/,/^baseurl:/ { /^description:/n; /^baseurl:/! s/^[^[:space:]]/  &/; }' ${SITE_PATH}/_config.yml
+		sed '/^description:/,/^baseurl:/ { /^description:/n; /^baseurl:/! { /^$/d; } }'
+	}
+}
+
+cd /app/jekyll &&
+	gem install jekyll jekyll-docs jekyll-compose bundler webrick
+
+[[ -f ${SITE_PATH}/_config.yml ]] &&
+	{
+		cd $SITE_PATH
+		bundle install
+		update_config
+		update_description
+		bundle exec jekyll serve --host $HOST_URL
+	} || {
+	jekyll new $SITE_PATH
+	cd $SITE_PATH
+	bundle install
+	update_config
+	update_description
+	bundle exec jekyll serve --host $HOST_URL
+}

docker-compose.yml

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+version: "3"
+services:
+  jekyll:
+    container_name: jekyll
+    build:
+      context: ${PWD}
+      args:
+        BLOG_NAME: ${BLOG_NAME}
+    env_file: ${PWD}/data/.env
+    ports:
+      - ${LIVERELOAD_PORT}:10000
+      - ${WWW_PORT}:4000
+    volumes:
+      - ${PWD}/jekyll:/app/jekyll
+      - ${PWD}/data:/opt/jekyll