Not setup for encryption

Dockerfile

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+FROM alpine:3.12
+LABEL maintainer="jmm@yavook.de"
+
+# Previous work: https://github.com/wernight/docker-duplicity
+
+ENV \
+    #################
+    # BACKUP POLICY #
+    #################
+    #
+    # when to run backups
+    # default: "36 03 * * *  " <=> daily at 3:36 am
+    SCHEDULE_BACKUP="36 03 * * *  " \
+    #
+    # when to remove failed transactions
+    # default: "36 04 * * *  " <=> daily at 04:36 am
+    SCHEDULE_CLEANUP="36 04 * * *  " \
+    #
+    # how often to opt for a full backup
+    # default: 4M <=> every 4 months
+    FULL_BACKUP_FREQUENCY=4M \
+    #
+    # how long to keep backups at all
+    # default: 9M <=> 9 months
+    BACKUP_RETENTION_TIME=9M \
+    #
+    # how many full backup chains with incrementals to keep
+    # default: 1
+    KEEP_NUM_FULL_CHAINS=1 \
+    \
+    ##################
+    # CRON SCHEDULES #
+    ##################
+    #
+    # when to remove old full backup chains
+    # default: "36 05 * * SAT" <=> every saturday at 05:36 am
+    SCHEDULE_RMFULL="36 05 * * SAT" \
+    #
+    # when to remove old incremental backups
+    # default: "36 05 * * SUN" <=> every sunday at 05:36 am
+    SCHEDULE_RMINCR="36 05 * * SUN"
+    
+
+RUN set -ex; \
+    \
+    apk add --no-cache \
+        ca-certificates \
+        gettext \
+        gnupg \
+        lftp \
+        libffi \
+        librsync \
+        libxml2 \
+        libxslt \
+        openssh \
+        openssl \
+        python3 \
+        py3-pip \
+        py3-six \
+        rsync \
+    ; \
+    update-ca-certificates; \
+    \
+    # dependencies to build python packages
+    apk add --no-cache -t .build-deps \
+        gcc \
+        libffi-dev \
+        librsync-dev \
+        libxml2-dev \
+        libxslt-dev \
+        make \
+        musl-dev \
+        openssl-dev \
+        python3-dev \
+    ; \
+    \
+    # make use of "wheel" python packages
+    pip3 install wheel ; \
+    \
+    pip3 install \
+        # main app
+        duplicity \
+        \
+        # general duplicity requirements, based on
+        # http://duplicity.nongnu.org/vers8/README
+        # https://git.launchpad.net/duplicity/tree/requirements.txt
+        fasteners \
+        future \
+        mock \
+        paramiko \
+        python-gettext \
+        requests \
+        urllib3 \
+        \
+        # backend requirements
+        azure-mgmt-storage \
+        b2sdk \
+        boto \
+        boto3 \
+        dropbox \
+        gdata \
+        jottalib \
+        mediafire \
+        mega.py \
+        pydrive \
+        pyrax \
+        python-swiftclient \
+        requests_oauthlib \
+    ; \
+    \
+    # remove buildtime dependencies
+    pip3 uninstall -y wheel; \
+    apk del --purge .build-deps
+
+COPY run.sh /usr/local/bin/do-plicity
+
+VOLUME ["/backup/source", "/backup/target", "/root/.cache/duplicity", "/root/.gnupg"]
+
+CMD ["do-plicity"]

run.sh

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+#!/bin/sh
+
+get_cron_line() {
+    task="${1}"
+    shift 1
+
+    cmdline='/bin/ionice -c 3 /usr/bin/duplicity --no-encryption'
+
+    case "${task}" in
+        backup)
+            cmdline="${cmdline} --allow-source-mismatch --volsize 1024 --full-if-older-than ${FULL_BACKUP_FREQUENCY} /backup/source"
+            ;;
+        
+        clean)
+            cmdline="${cmdline} cleanup --force"
+            ;;
+        
+        rmfull)
+            cmdline="${cmdline} remove-older-than ${BACKUP_RETENTION_TIME} --force"
+            ;;
+        
+        rmincr)
+            cmdline="${cmdline} remove-all-inc-of-but-n-full ${KEEP_NUM_FULL_CHAINS} --force"
+            ;;
+    esac
+
+    cmdline="${cmdline} file:///backup/target"
+    echo "${cmdline}"
+}
+
+prepare_crontab() {
+    echo "${SCHEDULE_BACKUP}"  "$(get_cron_line backup)"
+    echo "${SCHEDULE_CLEANUP}" "$(get_cron_line clean)"
+    echo "${SCHEDULE_RMFULL}"  "$(get_cron_line rmfull)"
+    echo "${SCHEDULE_RMINCR}"  "$(get_cron_line rmincr)"
+}
+
+get_crontab() {
+    echo   '# crontab generated for kiwi-backup'
+    printf '# generation time: '; date
+    echo   '#'
+    prepare_crontab
+}
+
+# replace crontab, start crond
+get_crontab | crontab -
+crond -fl 8