Trying to install Composer on OSX 10.9

Question

I'm trying to install Composer on OSX 10.9 following the instructions from getcomposer.org using this command:

curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local

Result:

#!/usr/bin/env php
All settings correct for using Composer

Fatal error: Uncaught exception 'RuntimeException' with message 'Unable to write bundled     cacert.pem to: /Users/aaron.rossano/.composer/cacert.pem' in -:402
Stack trace:
#0 -(112): installComposer(false, '/usr/local', 'composer.phar', false, false, false)
#1 -(14): process(Array)
#2 {main}
thrown in - on line 402

Answer 1

This is a bug introduced on 3/9/14. I sent a pull request to fix it:

https://github.com/composer/getcomposer.org/pull/62

In the mean time, just manually create a .composer folder in your home directory.

Answer 2

As an alternative, try downloading an older version of the Composer installer from GitHub. Simply replace the curl endpoint to a previous state of the installer file, e.g.:

curl -sS https://raw.github.com/composer/getcomposer.org/c6fedc418e1f80347724cf1bc3e86b607ac3ba30/web/installer | php -- --install-dir=/usr/local

Note: This is an older version of the installer only, not Composer itself. It'll download the latest version of Composer.

Additionally, to execute as superuser:

sudo sh -c "curl -sS https://raw.github.com/composer/getcomposer.org/c6fedc418e1f80347724cf1bc3e86b607ac3ba30/web/installer | php -- --install-dir=/usr/local"