Check for missing modules in hook_requirements

Created on 2 April 2015, about 10 years ago

Updated 8 May 2025, 2 days ago

Follow-up to #1081266: Avoid re-scanning module directory when a filename or a module is missing →

Problem/Motivation

To avoid performance deficit when multiple modules are missing. The deficit occurs because the "modules" directory is rescanned perpetually to look for missing modules on certain pages, such as admin/config.

Proposed resolution

We work around this by doing caching in #1081266: Avoid re-scanning module directory when a filename or a module is missing → , but ideally we want this to be fixe the root cause as well, so we'd want to inform administrators about any missing modules:

@Berdir → :

What about adding a hook_requirements() check that looks for missing modules and gives you a link that you can click that will drop that module from the system?
That is also a good place to place a bold red warning that you should never ever just remove a module without uninstalling it first. We're putting a huge amount of efforts into D8 to make uninstallation save and not leaving behind configuration and data and not being able to uninstall when a module is still used, just removing a module breaks all that. What if that module for example provides a bundle or a field type that is still used?

@swentel → :

To be clear: it is a bug (sometimes extremely annoying), I've actually hit it a couple of times as well, but I disagree that we should fix this at run time. There are better, cleaner ways (order is my preference)

hook_requirements() with a link to clean up

running update.php

when submitting the modules page

maybe, maybe, maybe when clearing full caches, although that's maybe over the top

I'm in favor of number 1 because we then also have a UI that informs the user which module(s) are actually missing.

Remaining tasks

Write/review patch/tests

User interface changes

None.

API changes

None.

📌 Task

Status

Postponed: needs info

Version

11.0 🔥

Component

base system

Created by

🇳🇱Netherlands stefan.r

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Performance
It affects performance. It is often combined with the Needs profiling tag.

stale-issue-cleanup
To track issues in the developing policy for closing stale issues, [Policy, no patch] closing older issues

Incomplete comments

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Comment 2 days ago →
🇺🇸United States smustgrave
Thank you for creating this issue to improve Drupal.

We are working to decide if this task is still relevant to a currently supported version of Drupal. There hasn't been any discussion here for over 8 years which suggests that this has either been implemented or is no longer relevant. Your thoughts on this will allow a decision to be made.

Since we need more information to move forward with this issue, the status is now Postponed (maintainer needs more info). If we don't receive additional information to help with the issue, it may be closed after three months.

Thanks!

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