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The latest Drush 9.x version recommends that Drupal 8 sites will be built using Composer, with Drush listed as a dependency. However, when you install Composer and Drush globally per step #1 on http://docs.drush.org/en/master/install and then proceed to step #2 Installing Drush Launcher and then try to run Drush on a pre-existing Drupal website (e.g. drush --version), then you will get:

Drush Launcher Version: 0.6.0
The Drush launcher could not find a Drupal site to operate on. Please do one of the following:

  • Navigate to any where within your Drupal project and try again.
  • Add --root=/path/to/drupal so Drush knows where your site is located.

How do I get around this problem, and make Drush work with pre-existing Drupal sites?

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  • Should I create a new empty git repository before I migrate an existing Drupl 8 site, or should I initialize the git repository with the drupal-composer/drupal-project:8.x-dev template first and then overwrite the web directory? – lanoxx Mar 11 at 7:30
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In case you use Drupal7, I did

drush pm-list --status="enabled" --no-core --fields=name,version > modules.txt
while read line; do comp=`echo $line | sed 's/.*(\(.*\))/\1/' - | sed 's/7\.x\-//' - | awk '$1=$1'`; echo \"drupal\/`echo $comp | awk '{ print $1 }'`\"\:\ \"`echo $comp | awk '{ print $2 }'`\"; done < modules.txt

You can cut&paste your modules list directly into your composer :D

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