Mirror APT repo

.dockerignore

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+*.swp

Dockerfile

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+FROM debian:stretch-slim
+
+ENV DEBIAN_FRONTEND noninteractive
+
+RUN apt-get -q -y update \
+  && apt-get -y --no-install-recommends install \
+    apt-mirror \
+    curl \
+  && rm -rf /var/lib/apt/lists/*
+
+COPY entrypoint.sh /
+RUN chmod +x /entrypoint.sh
+
+ENTRYPOINT [ "/entrypoint.sh" ]

entrypoint.sh

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+#!/usr/bin/env bash
+# vim: ts=2 sw=2 sts=2 et
+
+set -e
+set -u
+
+for repo_url in "$@"; do
+  curl -s -o /etc/apt/mirror.list "$repo_url"
+  apt-mirror
+  rm -f /etc/apt/mirror.list
+done