proftp docker build

Dockerfile

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+FROM debian:bullseye-slim
+RUN apt update && apt install -y proftpd && apt clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+RUN sed -i "s/# DefaultRoot/DefaultRoot /" /etc/proftpd/proftpd.conf
+EXPOSE 20 21
+ADD docker-entrypoint.sh /usr/local/sbin/docker-entrypoint.sh
+ENTRYPOINT ["/usr/local/sbin/docker-entrypoint.sh"]
+CMD ["proftpd","--nodaemon"]

docker-entrypoint.sh

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+#!/bin/bash
+
+# Parse users from FTP_LIST, create them and chown their home directories
+if [ -n "$FTP_LIST" ]; then
+	echo "Parsing user list and creating home folders..."
+	IFS=';' read -r -a parsed_ftp_list <<< "$FTP_LIST" ; unset IFS
+	for ftp_account in ${parsed_ftp_list[@]}
+	do
+		IFS=':' read -r -a tab <<< "$ftp_account" ; unset IFS
+		ftp_login=${tab[0]}
+		ftp_pass=${tab[1]}
+		CRYPTED_PASSWORD=$(perl -e 'print crypt($ARGV[0], "password")' $ftp_pass)
+		echo "ftp_login: $ftp_login"
+		# Only create user if it does not exist (e.g.: container is re-started)
+		USER_EXISTS=`id $ftp_login 2&> /dev/null; echo $?`
+		if [ $USER_EXISTS -ne 0 ]; then
+			useradd --shell /bin/sh ${USERADD_OPTIONS} -d /home/$ftp_login --password $CRYPTED_PASSWORD $ftp_login || { echo "Creating user $ftp_login failed! Check previous log message." ; exit 1; }
+    		chown -R $ftp_login:$ftp_login /home/$ftp_login || { echo "Failed to chown home folder for $ftp_login ! Check previous log message." ; exit 1; }
+		fi;
+	done
+fi
+
+if [[ -z "${PASSIVE_MIN_PORT}" ]]; then
+  PASV_MIN=50000
+else
+  PASV_MIN="${PASSIVE_MIN_PORT}"
+fi
+if [[ -z "${PASSIVE_MAX_PORT}" ]]; then
+  PASV_MAX=50100
+else
+  PASV_MAX="${PASSIVE_MAX_PORT}"
+fi
+sed -i "s/^\(# \)\?PassivePorts.*$/PassivePorts ${PASV_MIN} ${PASV_MAX}/" /etc/proftpd/proftpd.conf
+
+if [[ -z "${MASQUERADE_ADDRESS}" ]]; then
+  sed -i "s/^\(# \)\?MasqueradeAddress.*$/# MasqueradeAddress x.x.x.x/" /etc/proftpd/proftpd.conf
+else
+  sed -i "s/^\(# \)\?MasqueradeAddress.*$/MasqueradeAddress ${MASQUERADE_ADDRESS}/" /etc/proftpd/proftpd.conf
+fi
+
+exec "$@"