Missing extension exif on PHP 8 fpm alpine - php

Question

I have setup a php server from php:8.1.4-fpm-alpine3.14 using this dockerfile
FROM php:8.1.4-fpm-alpine3.14
RUN apk update
RUN apk add --no-cache git libzip-dev zip unzip php8-exif
RUN docker-php-ext-install pdo pdo_mysql zip exif \
&& curl -sS https://getcomposer.org/installer | php -- \
--install-dir=/usr/local/bin --filename=composer
WORKDIR /var/www/html
COPY . .
RUN chown -R www-data:www-data /var/www/html
RUN composer install
I tried installing a package spatie/laravel-medialibrary:^10.0.0 and got this error
Problem 1
- spatie/laravel-medialibrary[10.0.0, ..., 10.3.4] require ext-exif * -> it is missing from your system. Install or enable PHP's exif extension.
How do I fix this missing issue? I cannot find exif in the php modules list when i execute php -m
[PHP Modules]
Core
ctype
curl
date
dom
fileinfo
filter
ftp
hash
iconv
json
libxml
mbstring
mysqlnd
openssl
pcre
PDO
pdo_mysql
pdo_sqlite
Phar
posix
readline
Reflection
session
SimpleXML
sodium
SPL
sqlite3
standard
tokenizer
xml
xmlreader
xmlwriter
zip
zlib
[Zend Modules]

Answer 1

Have you manage to resolve this? I can see you are using docker-php-ext-install to add the extension, but you are not enabling it, so doing something like this (not tested in your's)
RUN docker-php-ext-install pdo pdo_mysql zip exif \
&& docker-php-ext-enable exif \ // <----- see here
&& curl -sS https://getcomposer.org/installer | php -- \
--install-dir=/usr/local/bin --filename=composer
If you build your dockerfile and then run again php -m in the container you will see it is listed there. However when I tried to run composer require spatie/laravel-medialibrary:^10.0.0 I still get the same error, at least in my case.
UPDATE
Try installing it using --ignore-plarform-reqs param, so
composer require "spatie/laravel-medialibrary:^10.0.0" --ignore-platform-reqs
This worked for me