bootstrap.sh

#!/bin/sh

# Get the sudo password at the beginning so we don't need to ask for the
# password again.
sudo -v

# Echo the commands.
set -x

# Constants.
EXPECTED_ARCHITECTURE="x86_64"
EXPECTED_OS="Ubuntu"
MINIMUM_OS_VERSION="18.04"

# Get the OS-related info.
. /etc/lsb-release || exit
OS_NAME=$DISTRIB_ID
OS_VERSION=$DISTRIB_RELEASE
OS_CODENAME=$DISTRIB_CODENAME

# Get the CPU architecture.
ARCHITECTURE=$(uname --processor) || exit

# Debugging output.
cat <<__EOS__ || exit
EXPECTED_ARCHITECTURE=${EXPECTED_ARCHITECTURE}
EXPECTED_OS=${EXPECTED_OS}
MINIMUM_OS_VERSION=${MINIMUM_OS_VERSION}
OS_NAME=${OS_NAME}
OS_VERSION=${OS_VERSION}
OS_CODENAME=${OS_CODENAME}
ARCHITECTURE=${ARCHITECTURE}
__EOS__

# Check we are running on a supported platform.
test "${OS_NAME}" = "${EXPECTED_OS}" || {
    echo "Error: We only support the OS '${EXPECTED_OS}', but the current OS is '${OS_NAME}'." 1>&2
    exit 2
}

if dpkg --compare-versions "${OS_VERSION}" lt "${MINIMUM_OS_VERSION}"; then
    echo "Error: We only support ${EXPECTED_OS} ${MINIMUM_OS_VERSION} and later, but the current OS is ${OS_NAME} ${OS_VERSION}." 1>&2
    exit 2
fi

test ${ARCHITECTURE} = "${EXPECTED_ARCHITECTURE}" || {
    echo "Error: We only support '${EXPECTED_ARCHITECTURE}' platform." 1>&2
    exit 2
}

# Update the APT package list.
sudo apt-get update || exit

# Install software-properties-common so we can use apt-add-repository.
sudo apt-get --yes install software-properties-common || exit

# Add Ansible PPA
# https://docs.ansible.com/ansible/latest/installation_guide/intro_installation.html#latest-releases-via-apt-ubuntu
if [ "$OS_VERSION" = "18.04" ]; then
    # The `ansible` is too old on Ubuntu 18.04's official package server so we
    # need to set up the PPA. On the later Ubuntu releases, `ansible` is new
    # enough (>= 2.9), so we can install the official `ansible` directly.
    sudo apt-add-repository --yes --no-update ppa:ansible/ansible || exit

    # Update the APT cache after adding all the PPAs.
    sudo apt-get update || exit
fi

# Install the required tools.
sudo apt-get --yes install \
    ansible \
    python3 \
        || exit

# Set up a temporary storage.
TMP_DIR=$(mktemp --directory) || exit

cleanup() {
    rm -fr "$TMP_DIR" || echo "WARNING: cleanup() failed" >&2
}
trap cleanup EXIT INT TERM

# Find all the Ansible requirements files.
find . -name "ansible-requirements.yml" -type f -print0 > "$TMP_DIR/ANSIBLE_REQUIREMENTS_FILES" || exit

# Install the needed Ansible roles.
xargs --arg-file "$TMP_DIR/ANSIBLE_REQUIREMENTS_FILES" -0 --no-run-if-empty --verbose -I"{}" \
    ansible-galaxy role install -r "{}" || exit

# Install the needed Ansible collections.
xargs --arg-file "$TMP_DIR/ANSIBLE_REQUIREMENTS_FILES" -0 --no-run-if-empty --verbose -I"{}" \
    ansible-galaxy collection install -r "{}" || exit

echo "All done!"