How to install PHP Composer on a Limesurvey Docker image - php

Question

Forgive me if this is an obvious question. I am fairly new to docker and I am having trouble understanding the installation instructions here:
https://hub.docker.com/_/composer/
I want to use PHP Composer in my Limesurvey docker image that was generated with the following docker-compose "yml" file:
limesurvey-md:
image: mariadb
restart: always
ports:
- "32805:3306"
environment:
MYSQL_DATABASE: limesurvey
MYSQL_ROOT_PASSWORD: password
MYSQL_USER: limesurvey
MYSQL_PASSWORD: password
volumes:
- limesurvey-db:/var/lib/mysql
- limesurvey-dblog:/var/log/mysql
- limesurvey-dbetc:/etc/mysql
limesurvey:
image: fjudith/limesurvey
restart: always
ports:
- "32705:80"
volumes:
- limesurvey-upload:/var/www/html/upload
links:
- limesurvey-md:mysql
What do I need to add to my yml file to accomplish this? If it helps, there is a directory called "application" in the Limesurvey image:
/var/www/html/application
And how do I give this composer a command while it is in the container? I am using Windows 10 and the docker container is running the default linux environment. fjudith's Limesurvey container is using the last 2.X branch of Limesurvey (the one right before 3.X) and it is running PHP 7.2

Answer 1

You can create a custom image with a dockerfile build, yo can specify the dockerfile name in the build section, the docker-compose.yml and dockerfile are in the same folder here i attach and example:
docker-compose.yml:
version: '3.1'
services:
limesurvey-md:
image: mariadb
restart: always
ports:
- 32805:3306
environment:
MYSQL_DATABASE: limesurvey
MYSQL_ROOT_PASSWORD: password
MYSQL_USER: limesurvey
MYSQL_PASSWORD: password
volumes:
- limesurvey-db:/var/lib/mysql
- limesurvey-dblog:/var/log/mysql
- limesurvey-dbetc:/etc/mysql
limesurvey:
build:
context: .
dockerfile: dockerfile
restart: always
ports:
- 32705:80
volumes:
- limesurvey-upload:/var/www/html/upload
links:
- limesurvey-md:mysql
volumes:
limesurvey-db:
driver: local
limesurvey-dblog:
driver: local
limesurvey-dbetc:
driver: local
limesurvey-upload:
driver: local
dockerfile:
FROM "fjudith/limesurvey:latest"
LABEL maintainer="ing.brayan.cm#gmail.com"
# Install Composer
RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer

Answer 2

Thanks Brayan! I just (10 minutes ago) figured out another way, you can also do a bash command. Since I was in Windows the two lines I had to do in my command prompt were
docker exec -it <my_container_name> bash
Then it put me into "/var/www/html#" where I did the following command:
$sudo curl -o /tmp/composer-setup.php https://getcomposer.org/installer && curl -o /tmp/composer-setup.sig https://composer.github.io/installer.sig && php -r "if (hash('SHA384', file_get_contents('/tmp/composer-setup.php')) !== trim(file_get_contents('/tmp/composer-setup.sig'))) { unlink('/tmp/composer-setup.php'); echo 'Invalid installer' . PHP_EOL; exit(1); }" && php /tmp/composer-setup.php --no-ansi --install-dir=/usr/local/bin --filename=composer --snapshot && rm -f /tmp/composer-setup.*
I adapted the second line from here: Get composer (php dependency manager) to run on a docker image build
From there it's easy! You can just do
composer
and it guides you through the possible commands. It suggests not using the "root" administrator. I'll have to look into creating another user in the docker image.