Can't install php7.2-ldap extension in Laradock

Question

I am trying to install php7.2-ldap in Laradock and I've set

WORKSPACE_INSTALL_LDAP=true

and

PHP_FPM_INSTALL_LDAP=true

and then tries to build the image like

docker-compose build workspace

And I get this error message. Part of the log

The following NEW packages will be installed:
  php7.2-ldap
0 upgraded, 1 newly installed, 0 to remove and 28 not upgraded.
Need to get 23.1 kB of archives.
After this operation, 101 kB of additional disk space will be used.
Err:1 http://ppa.launchpad.net/ondrej/php/ubuntu xenial/main amd64 php7.2-ldap amd64 7.2.4-1+ubuntu16.04.1+deb.sury.org+1
  404  Not Found
E: Failed to fetch http://ppa.launchpad.net/ondrej/php/ubuntu/pool/main/p/php7.2/php7.2-ldap_7.2.4-1+ubuntu16.04.1+deb.sury.org+1_amd64.deb 404  Not Found

E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
ERROR: Service 'workspace' failed to build: The command '/bin/sh -c if [ ${INSTALL_LDAP} = true ]; then     apt-get install -y libldap2-dev &&     apt-get install -y php${PHP_VERSION}-ldap ;fi' returned a non-zero code: 100

What's happening here and why can't I install this?

Answer 1

I am answering my own question.

This was fixed by adding

apt-get update -yqq && \

before

apt-get install -y libldap2-dev && \

in workspace/Dockerfile and php-fpm\Dockerfile.

A complete block will look like this:

File: workspace\Dockerfile

###########################################################################
# LDAP:
###########################################################################

ARG INSTALL_LDAP=false
ARG PHP_VERSION=${PHP_VERSION}

RUN if [ ${INSTALL_LDAP} = true ]; then \
    apt-get update -yqq && \
    apt-get install -y libldap2-dev && \
    apt-get install -y php${PHP_VERSION}-ldap \
;fi

Why did this happen? A quote from Github issue:

What appears to be happening here is that there are a few apt-get install commands for several packages are called while the local package repo is out of sync with the remote. In an interactive environment, this would be seen by the user and an appropriate apt-get update would be run. However, the Dockerfile does not contain any package repo update commands, as such the current layer has a different package repo list than the remote. This is in general the "problem" with dockers layers as they will be re-used if their command didn't change (something I, too, had to learn the hard way).

By: Philipp Tempel