Add Squid Docker images

modules/cloud-config-container/squid/docker/Dockerfile

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+# Copyright 2021 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+FROM debian:buster-slim
+
+ENV SQUID_VERSION=4.6 \
+    SQUID_CACHE_DIR=/var/spool/squid \
+    SQUID_LOG_DIR=/var/log/squid \
+    SQUID_USER=proxy
+
+RUN apt-get update \
+ && DEBIAN_FRONTEND=noninteractive apt-get install -y squid=${SQUID_VERSION}* \
+ && rm -rf /var/lib/apt/lists/*
+
+COPY entrypoint.sh /sbin/entrypoint.sh
+RUN chmod 755 /sbin/entrypoint.sh
+
+EXPOSE 3128/tcp
+ENTRYPOINT ["/sbin/entrypoint.sh"]

modules/cloud-config-container/squid/docker/cloudbuild.yaml

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+
+# Copyright 2021 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# In this directory, run the following command to build this builder.
+# $ gcloud builds submit .
+
+steps:
+- name: 'gcr.io/cloud-builders/docker'
+  args:
+  - build
+  - --tag=gcr.io/$PROJECT_ID/squid:${_IMAGE_VERSION}
+  - --tag=gcr.io/$PROJECT_ID/squid:latest
+  - .
+
+substitutions:
+    _IMAGE_VERSION: "20210215"
+images:
+  - 'gcr.io/$PROJECT_ID/squid:${_IMAGE_VERSION}'
+  - 'gcr.io/$PROJECT_ID/squid:latest'

modules/cloud-config-container/squid/docker/entrypoint.sh

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+#!/bin/bash
+
+# Copyright 2021 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# This container is based off Sameer Naik's existing squid container.
+# https://github.com/sameersbn/docker-squid
+
+set -e
+
+create_log_dir() {
+  mkdir -p ${SQUID_LOG_DIR}
+  chmod -R 755 ${SQUID_LOG_DIR}
+  chown -R ${SQUID_USER}:${SQUID_USER} ${SQUID_LOG_DIR}
+}
+
+create_cache_dir() {
+  mkdir -p ${SQUID_CACHE_DIR}
+  chown -R ${SQUID_USER}:${SQUID_USER} ${SQUID_CACHE_DIR}
+}
+
+create_log_dir
+create_cache_dir
+
+# allow arguments to be passed to squid
+if [[ ${1:0:1} = '-' ]]; then
+  EXTRA_ARGS="$@"
+  set --
+elif [[ ${1} == squid || ${1} == $(which squid) ]]; then
+  EXTRA_ARGS="${@:2}"
+  set --
+fi
+
+# default behaviour is to launch squid
+if [[ -z ${1} ]]; then
+  if [[ ! -d ${SQUID_CACHE_DIR}/00 ]]; then
+    echo "Initializing cache..."
+    $(which squid) -N -f /etc/squid/squid.conf -z
+  fi
+  echo "Starting squid..."
+  exec $(which squid) -f /etc/squid/squid.conf -NYCd 1 ${EXTRA_ARGS}
+else
+  exec "$@"
+fi