Someone

steev@wintermute ~/repos/linux-2.6 $ git rebase master
First, rewinding head to replay your work on top of it...
HEAD is now at de372ec... Documentation/i386/boot.txt: update and correct

*** Your name cannot be determined from your system services (gecos).

Run

  git config user.email "you@email.com"
  git config user.name "Your Name"

To set the identity in this repository.
Add --global to set your account's default

fatal: empty ident  <steev@wintermute.ubersekret.info> not allowed