This docker image builds on top of the official PHP 7.0-alpine image with the
purpose of building PHP composer packages. It provides several key features:
- Access to the build location will be in the volume located at
directory will be the default working directory.
- Composer bin directories are automatically included in
PATH. Both a
vendor/bindirectory, and the global
directory are included in the
This library is useful with simple
composer.json's from the command line.
docker run --interactive --tty --rm --volume /tmp/my-code:/code nubs/composer-build # Using short-options: # docker run -i -t --rm -v /tmp/my-code:/code nubs/composer-build
This will execute the default command (
composer install) and update your code
directory with the result (i.e.,
Other commands can also be executed. For example, to update dependencies:
docker run -i -t --rm -v /tmp/my-code:/code nubs/composer-build composer update
This image runs as root (PID 0), but for security purposes it is recommended to
use Docker's [user namespace functionality][docker-user-namespaces] to map that
to a non-privileged user on your host system.
If you use volume mounting of your project (e.g., to run
inside the container but want to modify the host
vendor directory), then you
may run into permission issues.
Without Docker's user namespaces, the container will create files/directories
with root ownership on your host which may cause issues when trying to access
them as a non-root user.
When using Docker's user namespaces, the container will be running under a
different user. You may have to adjust permissions on the directory to allow
the user to create/modify files. For example, giving an
/etc/subgid that contains
dockremap:165536:65536 and a docker daemon
running using this default mapping:
docker daemon --userns-remap=default,
you would need to run the following to give the container access to run
composer install and yourself access to do so on the host:
groupadd --gid 165536 subgid-root chmod -R g+w vendor chgrp -R subgid-root node_modules usermod -a -G subgid-root "$(whoami)"
Alternatively, you can create your own
Dockerfile that builds on top of this
image. This allows you to modify the environment by installing additional
software needed, altering the commands to run, etc.
A simple one that just installs another package but leaves the rest of the
process alone could look like this:
FROM nubs/composer-build RUN pecl install xdebug && \ docker-php-ext-enable xdebug
You can then build this docker image and run it against your
volume like normal (this example assumes the
are in your current directory):
docker build --tag my-code . docker run -i -t --rm -v "$(pwd):/code" my-code docker run -i -t --rm -v "$(pwd):/code" my-code composer update
docker-composer-build is licensed under the MIT license. See LICENSE for
the full license text.