Nailed it: It turns out there was a ~/.gitcookies file, referenced from ~/.gitconfig, that was messing up git.
The ~/.gitcookies file had a .googlesource.com cookie in it. I renamed the ~/.gitcookies file, effectively deleting it, and now things work as expected. -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.