refactor: use fenv for better .env content support

Author: joseluisq

docker/tmpl.Dockerfile

@@ -28,7 +28,11 @@ RUN adduser -h ${USER_HOME_DIR} -s /sbin/nologin -u 1000 -D ${USER_NAME} && \
     apk add --virtual build_deps $BUILD_DEPS && \
     \
     cp /usr/bin/envsubst /usr/local/bin/envsubst && \
-    apk del build_deps
+    apk del build_deps && \
+    wget --quiet -O /tmp/fenv.tar.gz "https://github.com/joseluisq/fenv/releases/download/v1.0.0/fenv_1.0.0_linux_$arch.tar.gz"; \
+	tar xzvf /tmp/fenv.tar.gz -C /usr/local/bin fenv; \
+	rm -f /tmp/fenv.tar.gz; \
+	chmod +x /usr/local/bin/fenv
 
 COPY ./__mysqldump.sh /usr/local/bin/__mysqldump.sh
 COPY ./mysql_exporter /usr/local/bin/mysql_exporter

mysql_exporter

@@ -4,15 +4,13 @@ set -e
 
 FILE_ENV=$1
 
-if [ -z "$FILE_ENV" ]; then
+if [[ -z "$FILE_ENV" ]]; then
     __mysqldump.sh
     exit 0
 fi
 
-if [ -f $FILE_ENV ]; then
-    export $(cat $FILE_ENV | xargs)
-
-    __mysqldump.sh
+if [[ -f $FILE_ENV ]]; then
+    fenv -f $FILE_ENV __mysqldump.sh
 else
     echo "file \`$FILE_ENV\` was not found"
     exit 1

mysql_exporter.env

@@ -1,8 +1,5 @@
 ## MySQL Export template settings
 ## ------------------------------
-## Note:
-##  .env files loading doesn't support comments,
-##  so they should be removed before
 
 # Connection settings (optional)
 DB_PROTOCOL=tcp

mysql_importer

@@ -4,15 +4,13 @@ set -e
 
 FILE_ENV=$1
 
-if [ -z "$FILE_ENV" ]; then
+if [[ -z "$FILE_ENV" ]]; then
     __mysqlimport.sh
     exit 0
 fi
 
-if [ -f $FILE_ENV ]; then
-    export $(cat $FILE_ENV | xargs)
-
-    __mysqlimport.sh
+if [[ -f $FILE_ENV ]]; then
+    fenv -f $FILE_ENV __mysqlimport.sh
 else
     echo "file \`$FILE_ENV\` was not found"
     exit 1

mysql_importer.env

@@ -1,8 +1,5 @@
 ## MySQL Import template settings
 ## ------------------------------
-## Note:
-##  .env files loading doesn't support comments,
-##  so they should be removed before
 
 # Connection settings (optional)
 DB_PROTOCOL=tcp