Service 'app' failed to build: COPY failed Laravel with Docker

Question

I'm setting up Docker for my laravel project following the blog post by DigitalOcean

When I run the command docker-compose up -dfrom Step 8 from the blog post I get the following error:

ERROR: Service 'app' failed to build: COPY failed: stat /var/lib/docker/tmp/docker-builder700663646/composer.lock: no such file or directory

Below is the configs from ~/larave.-app/Dockerfile

FROM php:7.2-fpm

# Copy composer.lock and composer.json
COPY composer.lock composer.json /var/www/

# Set working directory
WORKDIR /var/www

# Install dependencies
RUN apt-get update && apt-get install -y \
    build-essential \
    mysql-client \
    libpng-dev \
    libjpeg62-turbo-dev \
    libfreetype6-dev \
    locales \
    zip \
    jpegoptim optipng pngquant gifsicle \
    vim \
    unzip \
    git \
    curl

# Clear cache
RUN apt-get clean && rm -rf /var/lib/apt/lists/*

# Install extensions
RUN docker-php-ext-install pdo_mysql mbstring zip exif pcntl
RUN docker-php-ext-configure gd --with-gd --with-freetype-dir=/usr/include/ --with-jpeg-dir=/usr/include/ --with-png-dir=/usr/include/
RUN docker-php-ext-install gd

# Install composer
RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer

# Add user for laravel application
RUN groupadd -g 1000 www
RUN useradd -u 1000 -ms /bin/bash -g www www

# Copy existing application directory contents
COPY . /var/www

# Copy existing application directory permissions
COPY --chown=www:www . /var/www

# Change current user to www
USER www

# Expose port 9000 and start php-fpm server
EXPOSE 9000
CMD ["php-fpm"]

Can anyone help me to get through this issue ?

Answer 1

Docker build is trying to copy non-existent file composer.lock and fail. You forgot to run the step which would generate the composer.lock file:

Next, use Dockers' composer image to mount the directories that you will need for your Laravel project and avoid the overhead of installing Composer globally:

docker run --rm -v $(pwd):/app composer install

It's not clearly indicated in the tutorial but this will generate a composer.lock in your directory and allow the copy command to work properly.