'Attempts to find the currently installed version of SiCKRAGE.
Uses git show to get commit version.
Returns: True for success or False for failure'

def _find_installed_version(self):

    (output, _, exit_status) = self._run_git(self._git_path, u'rev-parse    HEAD')
    if ((exit_status == 0) and output):
        cur_commit_hash = output.strip()
        if (not re.match(u'^[a-z0-9]+$', cur_commit_hash)):
            sickrage.srCore.srLogger.error(u"Output    doesn't    look    like    a    hash,    not    using    it")
            return False
        return cur_commit_hash
