simple Composer wrapper : start with fixed php & composer version

composer

#!/bin/bash
#
# Composer wrapper : Start composer with fixed versions (PHP & composer)
#
# The "composer.phar" is cached locally within the vendor directory (avoid commit of the full phar inside a project)
#
#
# Licensed under the EUPL, Version 1.2 or – as soon they will be approved by
# the European Commission - subsequent versions of the EUPL (the "Licence");
# You may not use this work except in compliance with the Licence.
# You may obtain a copy of the Licence at:
#
# https://joinup.ec.europa.eu/software/page/eupl
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the Licence is distributed on an "AS IS" basis,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the Licence for the specific language governing permissions and
# limitations under the Licence.
#
# @author Antonio Rossetti <antonio@kimengumi.fr>
# @copyright since 2023 Antonio Rossetti
# @license <https://joinup.ec.europa.eu/software/page/eupl> EUPL
#

# Config
PHP_VERSION='7.4'          # x.y only
COMPOSER_VERSION='1.10.26' # x.y.z get version number from https://getcomposer.org/download/#composer-history-caption
VENDOR_DIR='../vendor/'    # relative to the current script

# Script start here
DIR="$(dirname $(readlink -f $0 2>/dev/null || perl -MCwd=realpath -e "print realpath '$0'"))/${VENDOR_DIR}"
PHAR="${DIR}/composer.${COMPOSER_VERSION}.phar"

if [ ! -e ${PHAR} ]; then
    mkdir -p ${DIR} || exit 1
    if ! [ -x "$(command -v wget)" ]; then
        echo "wget is not installed." >&2
        exit 1
    fi
    wget -O ${PHAR} https://getcomposer.org/download/${COMPOSER_VERSION}/composer.phar
fi

if ! [ -x "$(command -v php${PHP_VERSION})" ]; then
    echo "php${PHP_VERSION} is not installed." >&2
    exit 1
fi
php${PHP_VERSION} ${PHAR} "$@"