findrox.py

   1 # Most of the common code needed by ROX applications is in ROX-Lib2.
   2 # Except this code, which is needed to find ROX-Lib2 in the first place!
   3
   4 # Just make sure you import findrox before importing anything inside
   5 # ROX-Lib2...
   6
   7 import os, sys
   8 from os.path import exists
   9 import string
  10
  11 def version(major, minor, micro):
  12         """Find ROX-Lib2, with a version >= (major, minor, micro), and
  13         add it to sys.path. If version is missing or too old, either
  14         prompt the user, or (if possible) upgrade it automatically."""
  15
  16         if os.path.exists('/uri/0install/rox.sourceforge.net'):
  17                 # We're using ZeroInstall. Good :-)
  18                 zpath = '/uri/0install/rox.sourceforge.net/lib/ROX-Lib2/' \
  19                         'latest'
  20                 if os.path.exists(zpath):
  21                         vs = os.readlink(zpath).split('-')[-1]
  22                         v = map(int, vs.split('.'))
  23                         if v[0] < major or v[1] < minor or v[2] < micro:
  24                                 if os.system('cd /uri/0install/rox.sourceforge.net; 0refresh'):
  25                                         report_error('Using ROX-Lib in Zero Install, but cached version (%s) is too old (need %d.%d.%d) and updating failed (is zero-install running?)' % (vs, major, minor, micro))
  26                         sys.path.append(zpath + '/python')
  27                         return
  28                 print >>sys.stderr, "Using Zero Install, but failed to " \
  29                         "fetch", zpath, "-- trying non-0install system."
  30
  31         try:
  32                 path = os.environ['LIBDIRPATH']
  33                 paths = string.split(path, ':')
  34         except KeyError:
  35                 paths = [os.environ['HOME'] + '/lib',
  36                          '/usr/local/lib', '/usr/lib' ]
  37
  38         for p in paths:
  39                 p = os.path.join(p, 'ROX-Lib2')
  40                 if exists(p):
  41                         # TODO: check version is new enough
  42                         sys.path.append(os.path.join(p, 'python'))
  43                         break
  44         else:
  45                 report_error("This program needs ROX-Lib2 to run.\n" + \
  46                         "I tried all of these places:\n\n" + \
  47                         string.join(paths, '\n') + '\n\n' + \
  48                         "ROX-Lib2 is available from:\n" + \
  49                         "http://rox.sourceforge.net")
  50
  51 def report_error(err):
  52         "Write 'error' to stderr and, if possible, display a dialog box too."
  53         try:
  54                 sys.stderr.write('*** ' + err + '\n')
  55         except:
  56                 pass
  57         try:
  58                 import pygtk; pygtk.require('2.0')
  59                 import gtk; g = gtk
  60         except:
  61                 import gtk
  62                 win = gtk.GtkDialog()
  63                 message = gtk.GtkLabel(err +
  64                                 '\n\nAlso, pygtk2 needs to be present')
  65                 win.set_title('Missing ROX-Lib2')
  66                 win.set_position(gtk.WIN_POS_CENTER)
  67                 message.set_padding(20, 20)
  68                 win.vbox.pack_start(message)
  69
  70                 ok = gtk.GtkButton("OK")
  71                 ok.set_flags(gtk.CAN_DEFAULT)
  72                 win.action_area.pack_start(ok)
  73                 ok.connect('clicked', gtk.mainquit)
  74                 ok.grab_default()
  75
  76                 win.connect('destroy', gtk.mainquit)
  77                 win.show_all()
  78                 gtk.mainloop()
  79         else:
  80                 box = g.MessageDialog(None, g.MESSAGE_ERROR, 0,
  81                                         g.BUTTONS_OK, err)
  82                 box.set_title('Missing ROX-Lib2')
  83                 box.set_position(g.WIN_POS_CENTER)
  84                 box.set_default_response(g.RESPONSE_OK)
  85                 box.run()
  86         sys.exit(1)