[php] Composer: file_put_contents(./composer.json): failed to open stream: Permission denied

I'm trying to install Prestissimo to an Ubuntu 16.04 server, but that leads to an error:

$ composer global require "hirak/prestissimo:^0.3"
Changed current directory to /home/kramer65/.composer


  [ErrorException]
  file_put_contents(./composer.json): failed to open stream: Permission denied


require [--dev] [--prefer-source] [--prefer-dist] [--no-progress] [--no-update] [--no-scripts] [--update-no-dev] [--update-with-dependencies] [--ignore-platform-reqs] [--prefer-stable] [--prefer-lowest] [--sort-packages] [-o|--optimize-autoloader] [-a|--classmap-authoritative] [--] [<packages>]...

I'm logged in as user kramer65, so I wouldn't know why it can't write to my home folder. My normal reaction to a permission denied is to use sudo, but composer then always says:

Do not run Composer as root/super user! See https://getcomposer.org/root for details

Any idea how I can solve this?

I faced this issue as well but in my case, I was in wrong directory. Check the directory you are working

To resolve this, you should open up a terminal window and type this command:

sudo chown -R user ~/.composer (with user being your current user, in your case, kramer65)

After you have ran this command, you should have permission to run your composer global require command.

You may also need to remove the .composer file from the current directory, to do this open up a terminal window and type this command:

sudo rm -rf .composer

This might be super edge case, but if you are using Travis CI and taking advantage of caching, you might want to clear all cache and retry.

Fixed my issue when I was going from sudo to non sudo builds.

In my case I used sudo mkdir projectFolder to create folder. It was owned by root user and I was logged in using non root user.

So I changed the folder permission using command sudo chown mynonrootuser:mynonrootuser projectFolder and then it worked fine.

For me, in Ubuntu 18.04. I needed to chown inside ~/.config/composer/

E.g.

sudo chown -R $USER ~/.config/composer

Then global commands work.

I was getting the same exception, but in my case I am using PowerShell to run commands So, I fixed this with an instruction to unblock multiple files first. PS C:\> dir C:\executable_file_Path\*PowerShell* | Unblock-File and then use the following to load the package & 'C:\path_to_executable\php.exe' "c:\path_to_composer_.phar_file\composer.phar "require desired/package

In my case I don't have issues with ~/.composer.
So being inside Laravel app root folder, I did sudo chown -R $USER composer.lock and it was helpful.

In my case, .composer was owned by root, so I did sudo rm -fr .composer and then my global require worked.

Be warned! You don't wanna use that command if you are not sure what you are doing.