I'm a PhD student in my second year and strongly considering applying for a PhD position at a different university (see my previous question).
However, I'm not sure I want to bring this up with my advisor at the current moment (of maybe at all before I have secured another position, this seems to be the general advice over at workplace.SE).
For applying, though, I need to have two letters of recommendation, which will be hard to get not including my supervisor (because I have mostly worked with him so far, so there aren't many others I would consider asking) or maybe even excluding people who know him and would tell him that I am applying elsewhere.
What can I do in this situation?