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Symptom: You have a script that fails while executing a composer require command, resulting in output like the following:

$ ./example.sh

Gathering patches for root package.

Removing package drupal/core so that it can be re-installed and re-patched.

  - Removing drupal/core (8.6.x-dev)



In VcsDownloader.php line 242:



  Source directory docroot/core has uncommitted changes.

Attempting to execute the offending composer require command manually results in output like the following:

$ composer require drupal/examples

Gathering patches for root package.

Removing package drupal/core so that it can be re-installed and re-patched.

  - Removing drupal/core (8.6.x-dev)

    The package has modified files:

    M core.services.yml

    M includes/install.core.inc

    M includes/install.inc

    M lib/Drupal/Core/Config/ConfigInstaller.php

    M lib/Drupal/Core/Config/ExtensionInstallStorage.php

    M lib/Drupal/Core/Config/InstallStorage.php

    M lib/Drupal/Core/Entity/EntityViewBuilder.php

    M lib/Drupal/Core/EventSubscriber/ConfigImportSubscriber.php

    M lib/Drupal/Core/Extension/ExtensionDiscovery.php

    M lib/Drupal/Core/Extension/ModuleExtensionList.php

    19 more files modified, choose "v" to view the full list

    Discard changes [y,n,v,d,?]?

Conditions: You are using Composer to manage your Drupal site dependencies and applying patches with cweagans/composer-patches. You may be using Acquia BLT.

Explanation: The problem is that cweagans/composer-patches is applying patches to Drupal Core after cloning it, leading Composer to believe you've modified the affected files and therefore to prompt you to overwrite them lest you unwittingly lose work in progress.

Solution: Configure Composer to discard-changes which "[sets] the default style of handling dirty updates when in non-interactive mode... [to] always discard changes in vendors", then modify your script to pass the --no-interaction (or -n) flag. E.g.:

$ composer config discard-changes true

$ composer require -n drupal/examples

Using version 1.x-dev for drupal/examples

./composer.json has been updated

Gathering patches for root package.

Removing package drupal/core so that it can be re-installed and re-patched.

  - Removing drupal/core (8.6.x-dev)

Deleting docroot/core - deleted

Loading composer repositories with package information

Updating dependencies (including require-dev)

Package operations: 1 install, 0 updates, 0 removals

Gathering patches for root package.

No patches supplied.

Gathering patches for dependencies. This might take a minute.

  - Installing drupal/core (8.6.x-dev 8dbf42a): Cloning 8dbf42a90c from cache

  - Applying patches for drupal/core

    https://www.drupal.org/files/issues/2869592-remove-update-warning-7.patch (2869592 - Disabled update module shouldn't produce a status report warning)

    https://www.drupal.org/files/issues/2885441-2.patch (2885441 - EntityReferenceAutocompleteWidget should define its size setting as an integer)

    https://www.drupal.org/files/issues/2018-09-24/2815221-109.patch (2815221 - Add quickedit to the latest-revision route)

    https://www.drupal.org/files/issues/2018-10-12/1356276-531.patch (1356276 - Allow profiles to define a base/parent profile and load them in the correct order)

    https://www.drupal.org/files/issues/2018-07-09/2914389-8-do-not-test.patch (2914389 - Allow profiles to exclude dependencies of their parent)



Writing lock file

Generating autoload files