PECL not working on php:7.4-rc-fpm-alpine3.9

[ruivoh]

Hello there.

I'm trying to run pecl from inside the container and that's the output:
/ # pecl install redis
sh: pecl: not found

[tianon]

Indeed, this is expected for 7.4+:

• Add 7.4.0alpha1 #840 (comment)
• https://externals.io/message/103977
• Disable PEAR by default php/php-src#3781
• php/php-src@e93d6d9

[GrahamCampbell]

Can we still include pecl by default. It is super useful for installing extensions.

[tianon]

Copying part of my comment in #847 (comment) here since it's relevant:

I think what we should probably do here is revisit #846 by adding --with-pear for now and revisit for PHP 8 when it's fully deprecated. So to recap, that means we don't actually "fix" the problem here, but merely delay it for PHP 8 instead, at which point a replacement installer will be necessary (so if this is important to you or your organization, you should probably strongly consider getting involved in helping maintain the pecl utility, the pickle utility, or a new tool which solves the same use case in a general way and use this deprecation period in the way it's intended -- as a transitionary one).

(and re-opening this to track the change)

[tianon]

Opened a PR: #851