Is it impossible to generate a composer.lock file within a Docker container?

edit

No, it is not impossible to generate a composer.lock file within a Docker container. However, it depends on whether the dependencies are already installed in the container, and whether the composer.json file is present. Here are steps to generate a composer.lock file within a Docker container:

1. Create a Dockerfile and specify the base image:

FROM php:7.4-apache

1. Install Git, unzip, and the PHP extensions required by the dependencies:

RUN apt-get update \
    && apt-get install -y git unzip \
    && docker-php-ext-install pdo_mysql

1. Copy the composer.json file to the container:

COPY composer.json /var/www/html/

1. Run the composer install command:

RUN cd /var/www/html/ \
    && php -r "readfile('https://getcomposer.org/installer');" | php \
    && php composer.phar install

This command will install the dependencies and generate the composer.lock file.

1. Copy the code files to the container:

COPY . /var/www/html/

1. Start the container:

CMD ["apache2-foreground"]

Now, when you start the container, it will have the composer.lock file generated.