jenkins@jenkins:~/jobs/firs/workspace$ hg --version
Mercurial Distributed SCM (version 3.1.2)
(see http://mercurial.selenic.com for more information)

Copyright (C) 2005-2014 Matt Mackall and others
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
jenkins@jenkins:~/jobs/firs/workspace$ ls
Makefile  Makefile.config  Makefile.in  Makefile.local.sample  graphics_sources  lang  scripts  src
jenkins@jenkins:~/jobs/firs/workspace$ hg up 2.0.0-alpha
239 files updated, 0 files merged, 94 files removed, 0 files unresolved
jenkins@jenkins:~/jobs/firs/workspace$ hg up 2.0.0-alpha-1
abort: unknown revision '2.0.0'!