Install older version of composer on docker

Question

I am trying to run my laravel app on docker. Its an old app I am trying to resurface and was built on php 7.1

Locally, it works fine.

On Docker, I used the following config:

FROM php:7.1-fpm-alpine

RUN docker-php-ext-install pdo pdo_mysql sockets
RUN curl -sS https://getcomposer.org/installer​ | php -- \
     --install-dir=/usr/local/bin --filename=composer

COPY --from=composer:latest /usr/bin/composer /usr/bin/composer

WORKDIR /app
COPY . .
RUN composer install

Its not allowing me to install composer and gives the following error:

[stage-0 7/7] RUN composer install: #0 0.221 Composer 2.3.0 dropped support for PHP <7.2.5 and you are running 7.1.33, please upgrade PHP or use Composer 2.2 LTS via "composer self-update --2.2". Aborting.

I tried doing RUN composer self-update --2.2 instead but its the same error.

Can anyone tell me how to go install this specific version of composer on docker.

Thank you

Answer 1

All composer releases are accessible via their GitHub repository , including the composer.phar binary archive files. Instead of instaling the latest version from getcomposer.org, just use a version that works with your PHP version.

The composer.phar for composer 2.2.9 can be found here: https://github.com/composer/composer/releases/tag/2.2.9

Answer 2

Composer installer permit to choose the version:

1. Get the installer

   php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');" php -r "if (hash_file('sha384', 'composer-setup.php') === '55ce33d7678c5a611085589f1f3ddf8b3c52d662cd01d4ba75c0ee0459970c2200a51f492d557530c71c15d8dba01eae') { echo 'Installer verified'; } else { echo 'Installer corrupt'; unlink('composer-setup.php'); } echo PHP_EOL;"

   or use cURL to get the installer.

2. Install version

   php composer-setup.php --2.2

See https://getcomposer.org/download/