The major install shakeup

docker/tvnamer/Dockerfile

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+FROM debian:sid-slim
+
+ENV LC_ALL=C.UTF-8 \
+    LANG=C.UTF-8 \
+    LANGUAGE=en_US:en
+
+SHELL ["/bin/bash", "-o", "pipefail", "-c"]
+
+RUN set -x && \
+    KEPT_PACKAGES=() && \
+    # Packages kept in the image
+    KEPT_PACKAGES+=(bash) && \
+    KEPT_PACKAGES+=(ca-certificates) && \
+    KEPT_PACKAGES+=(locales) && \
+    KEPT_PACKAGES+=(locales-all) && \
+    KEPT_PACKAGES+=(python3) && \
+    KEPT_PACKAGES+=(python-is-python3) && \
+    KEPT_PACKAGES+=(python3-pip) && \
+    KEPT_PACKAGES+=(python3-pyxattr) && \
+    KEPT_PACKAGES+=(adduser) && \
+    # Install packages
+    apt-get update -y && \
+    apt-get install -y --no-install-recommends \
+        ${KEPT_PACKAGES[@]} \
+        && \
+    # Create /config directory
+    mkdir -p /config && \
+    # Clean-up
+    apt-get autoremove -y && \
+    apt-get clean -y && \
+    rm -rf /var/lib/apt/lists/* /tmp/*
+RUN rm -rf /usr/lib/python3.*/EXTERNALLY-MANAGED && \
+      pip3 install --no-cache tvnamer
+
+# # Copy init script, set workdir, set configdir & entrypoint
+COPY init /init
+WORKDIR /workdir
+ENTRYPOINT ["/init"]

docker/tvnamer/init

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+#!/bin/bash
+
+# Create dockeruser homedir
+mkdir -p /home/dockeruser
+
+# Set UID/PID of user that youtube-dl will be run as
+TVNAMERPGID=${PGID:-1000}
+TVNAMERPUID=${PUID:-1000}
+
+# Check to see if group/user already exist, if so, delete
+EXISTINGGROUPNAME=$(getent group "$TVNAMERPGID" | cut -d ':' -f 1)
+EXISTINGUSERNAME=$(getent passwd "$TVNAMERPUID" | cut -d ':' -f 1)
+if [[ -n "$EXISTINGGROUPNAME" ]]; then
+    groupdel -f "$EXISTINGGROUPNAME"
+fi
+if [[ -n "$EXISTINGUSERNAME" ]]; then
+    userdel -f "$EXISTINGUSERNAME"
+fi
+
+# Create user/group
+addgroup --quiet --gid "$TVNAMERPGID" dockeruser
+chown -R "$TVNAMERPUID":"$TVNAMERPGID" /home/dockeruser
+adduser --quiet --system --disabled-password --uid "$TVNAMERPUID" --gid "$TVNAMERPGID" --home /home/dockeruser dockeruser
+HOME=/home/dockeruser
+export HOME
+
+# Set UMASK if required
+if [[ -n "$UMASK" ]]; then
+    umask "$UMASK"
+fi
+
+# Run tvnamer with remainder of command line arguments
+if [ -f /config/tvnamerconfig.json ]; then
+  setpriv --reuid dockeruser --regid dockeruser --keep-groups tvnamer -c /config/tvnamerconfig.json "$@"
+else
+  setpriv --reuid dockeruser --regid dockeruser --keep-groups tvnamer "$@"
+fi