git problem : fatal: Unable to write new index file

Question

I have an existing project that has been managed under git. I recently had to do a ground-up rebuild of the computer (OS X Snow Leopard), and returning to the project, git c

Answer 1

To add: surprisingly, some git plug-ins blocks index file. My Eclipse Kepler has default plug-in, that occasionally updates some own info from git repo, blocking index file during that operation.