Recently my Bazaar server broke.
I'm left only with working copy of my branch.
Is there possibility to migrate this working copy to git repository?
Do I have chance to restore history of commits?
Isn't bazaar supposed to be a distributed VCS (scm, whatever)? You should have the entire repository along with that working tree. (that's how git/hg work)
I may not understand your question, in that case the only thing you can do is git init with no chance to restore the history.