linux-prep-machine

#!/bin/bash
#
# Copyright (C) Extensible Service Proxy Authors
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
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################################################################################
#

if [[ "$(uname)" != "Linux" ]]; then
  echo "Run on Linux only."
  exit 1
fi

ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
. ${ROOT}/script/all-utilities || { echo "Cannot load Bash utilities"; exit 1; }

echo "Redirecting /bin/sh to bash."
${SUDO} debconf-set-selections <<< "debconf dash/sh select false" \
  && ${SUDO} dpkg-reconfigure -fnoninteractive dash \
  || error_exit "Cannot redirect /bin/sh to bash."

echo "Initializing Bazel sandboxing."
if SANDBOX=$(cat /proc/sys/kernel/unprivileged_userns_clone); then
  [[ "${SANDBOX}" -eq 1 ]] \
    || ${SUDO} sysctl kernel.unprivileged_userns_clone=1 \
    || echo "Cannot enable Bazel sandbox."
fi

echo "Creating directories required by NGINX process."
${SUDO} mkdir --parents --mode=777 \
    /var/log/nginx \
    /var/cache/nginx/client_temp \
    /var/cache/nginx/proxy_temp \
  || error_exit "Cannot create NGINX directories."

# Create an nginx user and group. NGINX uses them to reduce privilege
# after startup.
if ! ${SUDO} getent group nginx >/dev/null 2>&1 ; then
    echo "Creating nginx group."
    ${SUDO} addgroup --system nginx \
      || error_exit "Cannot create 'nginx' group."
fi

if ! ${SUDO} getent passwd nginx >/dev/null 2>&1 ; then
    echo "Creating nginx user."
    ${SUDO} adduser \
        --system \
        --disabled-login \
        --ingroup nginx \
        --no-create-home \
        --gecos "nginx user" \
        --shell /bin/false \
        nginx \
      || error_exit "Cannot create 'nginx' user."
fi