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I am using Drush 9 and Drupal 8. When I execute drush site:install I find that it also modifies the permission of the web/site/default directory to r-xr-x--x, which troubles me delete that directory later. I want that directory to be 740 in my case. So two methods came to my mind. One is to run a custom shell script as post drush si or to override the default dush si command. I tried to go through some blogs but I couldn't understand them. Please explain stepwise.

How can I invoke a custom shell script to drush site:install which will be run just after that command is executed.

How can I override the default site:install command?

Note: I am using Drupal composer project. So I have a drush folder outside the webroot but I don't know if I can edit some files in that directory and write my custom commands.

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    Every time the cache is cleared in Drupal and some other similar events, it will lock those folders down. – Kevin Nov 20 '18 at 21:44
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    So you mean it is not only matter of drush si but any command is executed it will modify the permission. Any way to provide my custom permission ? – SkyRar Nov 20 '18 at 21:47
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    @Kevin I examined with drush cr and cc. But It doesn't modify the permission. Only drush si does – SkyRar Nov 20 '18 at 21:54
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Greg's answer is great. But to more precisely answer this particular question follow the below steps.

1- As you are using Drupal composer project template, Go to the directory your_drupal_project/drush and create a file called SiteInstallCommands.php. You can see there are another similar file PolicyCommands.php.

2- SiteInstallCommands.php should have below code snippets. installTest() is your custom commands that is going to be executed post site:install. So change it according to your needs.

<?php

namespace Drush\Commands;


class SiteInstallCommands extends DrushCommands
{

    /**
     * Executing command just after `drush site:install`
     *
     * @hook post-command site-install
     *
     */
    public function installTest() {
        drush_shell_exec('echo test');
    }
}
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See the example file PolicyCommands.php in the Druhs examples directory. Create a directory named "Commands" in your site's "drush" directory, and put your command file there. Its name must end with "Commands.php" or "Hooks.php".

Create a hook similar to one of the ones shown in the example file. You'll want @hook post-command site:install.

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    Thanks. Do I also need to define drush.yml here github.com/drupal-composer/drupal-project/tree/8.x/drush ? Is there anything I need to define or edit ? Can you please have a look on this link ? – SkyRar Nov 21 '18 at 1:34
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    For testing purpose, as per the documentation I run drush --include=/var/www/drupal/vendor/drush/drush/examples xkcd , drush cc drush, then drush xkcd, but getting error command is not defined. Am I missing something ? – SkyRar Nov 21 '18 at 3:19
  • If you put your command in /var/www/drupal/drush/Commands, then you do not need --include – greg_1_anderson Nov 22 '18 at 22:43

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