reduce amount of layers when building

src/app/Dockerfile

@@ -1,16 +1,18 @@
 FROM alpine:3.13
 EXPOSE 9000/tcp
 
-RUN apk add --no-cache dcron php8 php8-fpm \
-	php8-pdo php8-gd php8-pgsql php8-pdo_pgsql php8-mbstring \
-	php8-intl php8-xml php8-curl php8-session php8-tokenizer \
-	php8-dom php8-fileinfo php8-json php8-iconv \
-	php8-pcntl php8-posix php8-zip php8-openssl \
-	git postgresql-client sudo rsync
-
 ENV SCRIPT_ROOT=/opt/tt-rss
 
-RUN mkdir -p /var/www ${SCRIPT_ROOT}/config.d
+RUN apk add --no-cache dcron php8 php8-fpm \
+	php8-pdo php8-gd php8-pgsql php8-pdo_pgsql \
+	php8-mbstring php8-intl php8-xml php8-curl \
+	php8-session php8-tokenizer php8-dom php8-fileinfo \
+	php8-json php8-iconv php8-pcntl php8-posix php8-zip \
+	php8-openssl git postgresql-client sudo php8-pecl-xdebug rsync && \
+	sed -i.bak 's/^listen = 127.0.0.1:9000/listen = 9000/' /etc/php8/php-fpm.d/www.conf && \
+	sed -i.bak 's/\(memory_limit =\) 128M/\1 256M/' /etc/php8/php.ini && \
+	sed -i.bak 's/;clear_env = .*/clear_env = no/i' /etc/php8/php-fpm.d/www.conf && \
+	mkdir -p /var/www ${SCRIPT_ROOT}/config.d
 
 ADD startup.sh ${SCRIPT_ROOT}
 ADD updater.sh ${SCRIPT_ROOT}
@@ -20,15 +22,16 @@ ADD backup.sh /etc/periodic/weekly/backup
 ADD config.docker.php ${SCRIPT_ROOT}
 ADD build-prepare.sh ${SCRIPT_ROOT}
 
-RUN sed -i.bak 's/^listen = 127.0.0.1:9000/listen = 9000/' /etc/php8/php-fpm.d/www.conf
-RUN sed -i.bak 's/\(memory_limit =\) 128M/\1 256M/' /etc/php8/php.ini
-RUN sed -i.bak 's/;clear_env = .*/clear_env = no/i' /etc/php8/php-fpm.d/www.conf
-
 RUN sh -c ${SCRIPT_ROOT}/build-prepare.sh
 
 ENV OWNER_UID=1000
 ENV OWNER_GID=1000
 
+# TTRSS_XDEBUG_HOST defaults to host IP if unset
+ENV TTRSS_XDEBUG_ENABLED=""
+ENV TTRSS_XDEBUG_HOST=""
+ENV TTRSS_XDEBUG_PORT="9000"
+
 ENV TTRSS_DB_TYPE="pgsql"
 ENV TTRSS_DB_HOST="db"
 ENV TTRSS_DB_PORT="5432"

src/app/startup.sh

@@ -69,6 +69,21 @@ fi
 # this was previously generated
 rm -f $DST_DIR/config.php.bak
 
+if [ ! -z "${TTRSS_XDEBUG_ENABLED}" ]; then
+	if [ -z "${TTRSS_XDEBUG_HOST}" ]; then
+		export TTRSS_XDEBUG_HOST=$(ip ro sh 0/0 | cut -d " " -f 3)
+	fi
+	echo enabling xdebug with the following parameters:
+	env | grep TTRSS_XDEBUG
+	cat > /etc/php8/conf.d/50_xdebug.ini <<EOF
+zend_extension=xdebug.so
+xdebug.mode=develop,trace,debug
+xdebug.start_with_request = yes
+xdebug.client_port = ${TTRSS_XDEBUG_PORT}
+xdebug.client_host = ${TTRSS_XDEBUG_HOST}
+EOF
+fi
+
 cd $DST_DIR && sudo -E -u app php8 ./update.php --update-schema=force-yes
 
 touch $DST_DIR/.app_is_ready