composer install in Dockerfile not saving dependencies - docker

Question

I have some trouble to dockerize a Symfony project. At the first start from cloning from git repo the dependencies have to installed through composer.
I have read many questions with the same background but i cant get it working.
i show u first my Dockerfile:
ARG PHP_VERSION=8.1
ARG APP_ENV=dev
# Prod image
FROM php:${PHP_VERSION}-fpm-alpine AS app_php
# Update
RUN apk --no-cache update
RUN apk --no-cache add bash git
# Install Node
RUN apk --no-cache add --update nodejs npm
RUN apk --no-cache add --update python3
RUN apk --no-cache add --update make
RUN apk --no-cache add --update g++
# Install pdo
RUN docker-php-ext-install pdo_mysql
# Install Composer
RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer
# Symfony CLI
RUN curl -sS https://get.symfony.com/cli/installer | bash && mv /root/.symfony/bin/symfony /usr/local/bin/symfony
# WORK DIR
WORKDIR /var/www/html
# https://getcomposer.org/doc/03-cli.md#composer-allow-superuser
ENV COMPOSER_ALLOW_SUPERUSER=1
ENV PATH="${PATH}:/root/.composer/vendor/bin"
COPY --from=composer:2 /usr/bin/composer /usr/bin/composer
# prevent the reinstallation of vendors at every changes in the source code
COPY composer.* symfony.* ./
RUN set -eux; \
if [ -f composer.json ]; then \
composer install --prefer-dist --no-dev --no-autoloader --no-scripts --no-progress; \
composer clear-cache; \
fi
RUN set -eux; \
mkdir -p var/cache var/log; \
if [ -f composer.json ]; then \
composer dump-autoload --classmap-authoritative --no-dev; \
composer dump-env prod; \
composer run-script --no-dev post-install-cmd; \
chmod +x bin/console; sync; \
fi
# copy sources
COPY . /var/www/html
RUN rm -Rf docker/
# Start Symfony server on Port 8000
EXPOSE 8000
#RUN symfony console doctrine:migrations:migrate
i can see that the packages were installed through the build process, but after docker-compose up the vendor folder isnt set.
Do u have an idea to solve this?

Answer 1

Running it for you, indeed there is no vendors files where you woudl expect them.
if you run a shell on your container you would see what's really happening:
Get your created container id or tag with docker image ls
And run it:
docker run --rm -it <CONTAINER_ID> /bin/bash
bash-5.1# ls /var/www/html/
Dockerfile composer.1 composer.2 symfony.1 var
bash-5.1# ls -al /root/.composer/
total 8
drwxr-xr-x 1 root root 50 Aug 14 15:47 .
drwx------ 1 root root 16 Aug 14 15:48 ..
-rw-r--r-- 1 root root 799 Aug 14 15:47 keys.dev.pub
-rw-r--r-- 1 root root 799 Aug 14 15:47 keys.tags.pub
bash-5.1# ls /usr/bin/composer
/usr/bin/composer
bash-5.1# ls /usr/local/bin/composer
/usr/local/bin/composer
bash-5.1# which composer
/usr/local/bin/composer
bash-5.1# which symfony
/usr/local/bin/symfony
bash-5.1#
The which command would make you realize:
you don't need to copy composer when you already install it
/usr/local/bin is already part of the PATH
The current ENV command is not necessary plus pointing to a non existing folder.
FYI to keep it slim I have created fake symfony.* and composer.* files and have no composer.json (not shared here).
I hope this helps you solve it.