How to invoke a post drush command?

Question

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.

Answer 1

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');
    }
}

Answer 2

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.

Answer 3

To create a site:install hook I just needed to create a file SiteInstallCommands.php inside drush/Commands dir. then drush cc drush to clear the drush cache and my custom post command is up. Thanks to @greg_1_anderson for guiding. Note you have to add @hook post-command site-install not @hook post site:install.

<?php

namespace Drush\Commands;


class InstallCommands extends DrushCommands
{

    /**
     * Modify files/directory permission as per project's need executing just after `drush site:install`
     *
     * @hook post-command site-install
     *
     */
    public function installChmod() {
        $this->logger()->success(dt('Executing post site:install commands'));
        drush_shell_exec('chmod -R 740 sites/default');

    }
}