PLC/Methods/GetPlcRelease.py

   1 from PLC.Method import Method
   2 from PLC.Auth import Auth
   3 from PLC.Faults import *
   4
   5 import re
   6
   7 comment_regexp = '\A\s*#.|\A\s*\Z|\Axxxxx'
   8
   9 regexps = { 'build'   : '\A[bB]uild\s+(?P<key>[^:]+)\s*:\s*(?P<value>.*)\Z',
  10             'tags'    : '\A(?P<key>[^:]+)\s*:=\s*(?P<value>.*)\Z'}
  11
  12 class GetPlcRelease(Method):
  13     """
  14     Returns various information about the current myplc installation.
  15     """
  16
  17     roles = ['admin', 'pi', 'user', 'tech', 'node', 'anonymous']
  18
  19     accepts = [
  20         Auth(),
  21         ]
  22
  23     # for now only return /etc/myplc-release verbatim
  24     returns = { 'build' : 'information about the build',
  25                 'tags' : 'describes the codebase location and tags used for building',
  26                 'rpms' : 'details the rpm installed in the myplc chroot jail' }
  27
  28     def call(self, auth):
  29
  30         comment_matcher = re.compile(comment_regexp)
  31
  32         matchers = {}
  33         result = {}
  34         for field in regexps.keys():
  35             matchers[field] = re.compile(regexps[field])
  36             result[field]={}
  37         result['rpms']="Not implemented yet"
  38
  39         try:
  40             release = open('/etc/myplc-release')
  41             for line in release.readlines():
  42                 line=line.strip()
  43                 if comment_matcher.match(line):
  44                     continue
  45                 for field in regexps.keys():
  46                     m=matchers[field].match(line)
  47                     if m:
  48                         (key,value)=m.groups(['key','value'])
  49                         result[field][key]=value
  50                         break
  51                 else:
  52                     if not result.has_key('unexpected'):
  53                         result['unexpected']=""
  54                     result['unexpected'] += (line+"\n")
  55         except:
  56             raise PLCNotImplemented, 'Cannot open /etc/myplc-release'
  57         return result