vagrant-install.sh

#!/bin/bash
# Copyright (C) 2018-2021 Maxar Technologies (https://www.maxar.com)
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
set -euo pipefail

# Allow overrides from environment for:
#  * VAGRANT_VERSION
#  * VAGRANT_BASEURL
LSB_DIST="$(. /etc/os-release && echo "${ID}")"
VAGRANT_VERSION="${VAGRANT_VERSION:-2.2.19}"
VAGRANT_BASEURL="${VAGRANT_BASEURL:-https://releases.hashicorp.com/vagrant/${VAGRANT_VERSION}}"

# Set up command differences between RHEL and Debian-based systems.
if [ "${LSB_DIST}" == "centos" ] || [ "${LSB_DIST}" == "fedora" ] || [ "${LSB_DIST}" == "rhel" ]; then
    # RHEL-based.
    if [ "$(rpm -q vagrant --queryformat '%{version}')" == "${VAGRANT_VERSION}" ]; then
        echo "Vagrant ${VAGRANT_VERSION} is already installed."
        exit 0
    fi
    DOWNLOAD_COMMAND="curl -sSL -O"
    INSTALL_COMMAND="yum install -y"
    PACKAGE_SUFFIX="$(arch).rpm"
elif [ "${LSB_DIST}" == "debian" ] || [ "${LSB_DIST}" == "ubuntu" ]; then
    # Debian-based.
    if [ "$(dpkg-query --showformat=\$\{Version\} --show vagrant)" == "1:${VAGRANT_VERSION}" ]; then
        echo "Vagrant ${VAGRANT_VERSION} is already installed."
        exit 0
    fi
    DOWNLOAD_COMMAND="wget -nv -L"
    INSTALL_COMMAND="dpkg -i"
    PACKAGE_SUFFIX="$(arch).deb"
else
    echo "Do not know how to install Vagrant on ${LSB_DIST}."
    exit 1
fi

if [ "$(id -u)" -ne 0 ]; then
    INSTALL_COMMAND="sudo ${INSTALL_COMMAND}"
fi

# Variables for package, checksum, and signature file.
PACKAGE="vagrant_${VAGRANT_VERSION}_${PACKAGE_SUFFIX}"
CHECKSUMS="vagrant_${VAGRANT_VERSION}_SHA256SUMS"
SIGNATURE="vagrant_${VAGRANT_VERSION}_SHA256SUMS.sig"

if [ ! -x /usr/bin/gpgv ]; then
    echo "Then gpgv utility is needed to verify ${PACKAGE}." >> /dev/stderr
    exit 1
fi

# Do all our file manipulation in temporary fs.
pushd /var/tmp

# Create Hashicorp GPG keyring from base64-encoded binary of the release
# key (C874 011F 0AB4 0511 0D02 1055 3436 5D94 72D7 468F).
echo "mQINBGB9+xkBEACabYZOWKmgZsHTdRDiyPJxhbuUiKX65GUWkyRMJKi/1dviVxOXPG6hBPtF48IF
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    base64 -d > hashicorp.gpg

# Download Vagrant files.
for vagrant_file in ${PACKAGE} ${CHECKSUMS} ${SIGNATURE}; do
    ${DOWNLOAD_COMMAND} "${VAGRANT_BASEURL}/${vagrant_file}"
done

# GPG verify the signature for the SHA256SUMS file.
gpgv --keyring ./hashicorp.gpg "${SIGNATURE}" "${CHECKSUMS}"

# Verify checksums, but grep out all other lines in the checksum
# file except the desired package.
sha256sum -c <(grep -e "[[:space:]]\\+${PACKAGE}\\>" "${CHECKSUMS}")

# Finally install Vagrant.
${INSTALL_COMMAND} "${PACKAGE}"

# Clean up.
rm -f hashicorp.gpg "${PACKAGE}" "${CHECKSUMS}" "${SIGNATURE}"
popd