Since yesterday I have an odd error during provisioning my VM.
Error: curl -sS https://getcomposer.org/installer | php returned 255 instead of one of [0]
It's odd because this command works fine on the machine. It seems that only response code is not valid.
There seems to have been some change made to Composer's servers. I'm not sure of what, but curl was no longer succeeding for installation process.
This issue has been resolved in this commit, though: https://github.com/puphpet/puppet-puphpet/commit/659fc6d6548dd8158fdac7bb834111c769854a98
Either apply the patch manually or regenerate your archive from the puphpet gui and you'll be set.
