Docker image build with PHP zip extension shows "bundled libzip is deprecated" warning

Question

I have a Dockerfile with a build command like this:

#install some base extensions
RUN apt-get install -y \
        zlib1g-dev \
        zip \
  && docker-php-ext-install zip

I get this warning from build output:

WARNING: Use of bundled libzip is deprecated and will be removed.
configure: WARNING: Some features such as encryption and bzip2 are not available.
configure: WARNING: Use system library and --with-libzip is recommended.

What is the correct way to install the zip extension without these warnings?

My complete Dockerfile looks like:

FROM php:7.2-apache

RUN apt-get clean
RUN apt-get update

#install some basic tools
RUN apt-get install -y \
        git \
        tree \
        vim \
        wget \
        subversion

#install some base extensions
RUN apt-get install -y \
        zlib1g-dev \
        zip \
  && docker-php-ext-install zip

#setup composer
RUN curl -sS https://getcomposer.org/installer | php \
        && mv composer.phar /usr/local/bin/ \
        && ln -s /usr/local/bin/composer.phar /usr/local/bin/composer


WORKDIR /var/www/

Answer 1

It looks like PHP no longer bundles libzip. You need to install it. You install zlib1g-dev, but instead install libzip-dev. This installs zlib1g-dev as a dependency and allows the configure script to detect that libzip is installed.

For PHP < 7.3, you then need to

docker-php-ext-configure zip --with-libzip

before performing the installation with

docker-php-ext-install zip

as the last warning indicates.

In short: change the relevant part of your Dockerfile to

For PHP < 7.3

#install some base extensions
RUN apt-get install -y \
        libzip-dev \
        zip \
  && docker-php-ext-configure zip --with-libzip \
  && docker-php-ext-install zip

For PHP >= 7.3

#install some base extensions
RUN apt-get install -y \
        libzip-dev \
        zip \
  && docker-php-ext-install zip

I have verified that this builds as expected.

 

---

 

In case you are not using the Docker PHP base image, things may be much easier. For example, for Alpine the following Dockerfile will get you PHP 7 with the zip extension installed.

FROM alpine:latest

RUN apk update && apk upgrade
RUN apk add php7 php7-zip composer