Let me add a litle note here, because when I was looking for a solution I found a lot of comments about the root user.

So I decided to test, again, but now using a nonroot user.

That is what I found:

• Remember: I was using the WSL2 "root" user, so: adduser myNonRootUser to create the user.

I was getting "Docker is not running" message because this user was not on the "docker" group.

• sudo usermod -aG docker myNonRootUser to put the user into the "docker" group.

• Then su MyNonRootUser to change for the new user.

• Then I did the steps 1 and 2 again and ... same step 3 error.. but this time only chmod 777 did the trick

• To finish, the sail composer require did not worked as well ... './composer.json is not writable'

Conclusion: its has nothing to do with root / nonroot. Just use the @mohamedtammam pointed solution and move on

It sounds like there may be a permissions issue with the files and directories in your Laravel app.

One possible cause of this issue is that the user running the sail command does not have the necessary permissions to write to the directories and files in the app.

In the case you are running the command as root user, it's not the best practice. You should use a non-root user with proper permissions to run the command.

You can try to change the ownership of the files and directories to the user running the sail command, and then set the appropriate permissions using chmod.

You can also try to run the sail command using sudo to temporarily elevate your user's permissions, but this is not recommended as it can lead to security issues.

Alternatively, you can try to use a tool like acl to set permissions on the files and directories in a more fine-grained way.

It's also worth checking the documentation for the sail package, to see if there are any recommendations for resolving permission issues.

Please let me know if this helps or if you have any additional questions.

I still cannot install filament, so far i got these permission set to the sail user:

drwxr-xr-x  3 root root 4096 Jun  1 14:41 .
drwxr-xr-x  1 root root 4096 Jun  1 14:41 ..
drwxr-xr-x 12 sail sail 4096 Jun  1 16:40 html

In RequireCommand.php line 142:
                                                                                
  file_put_contents(./composer.json): Failed to open stream: Permission denied

Thanks

Try this:

./vendor/bin/sail up -d
sudo adduser sail --disabled-password
sudo usermod -aG sail sail
sudo usermod -aG sail ${USER}
./vendor/bin/sail root-shell
cd ../
chown -R sail:sail html