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         If 'rox' is already in PYTHONPATH, just use that (assume the injector
  16         is being used)."""
  17         try:
  18                 import rox
  19         except ImportError:
  20                 pass
  21         else:
  22                 #print "Using ROX-Lib in PYTHONPATH"
  23                 if (major, minor, micro) > rox.roxlib_version:
  24                         print >>sys.stderr, "WARNING: ROX-Lib version " \
  25                                 "%d.%d.%d requested, but using version " \
  26                                 "%d.%d.%d from %s" % \
  27                                 (major, minor, micro,
  28                                  rox.roxlib_version[0],
  29                                  rox.roxlib_version[1],
  30                                  rox.roxlib_version[2],
  31                                  rox.__file__)
  32                 return
  33
  34         if not os.getenv('ROXLIB_DISABLE_ZEROINSTALL') and os.path.exists('/uri/0install/rox.sourceforge.net'):
  35                 # We're using ZeroInstall. Good :-)
  36                 zpath = '/uri/0install/rox.sourceforge.net/lib/ROX-Lib2/' \
  37                         'latest'
  38                 if os.path.exists(zpath):
  39                         vs = os.readlink(zpath).split('-')[-1]
  40                         v = map(int, vs.split('.'))
  41                         if v[0] < major or v[1] < minor or v[2] < micro:
  42                                 if os.system('0refresh rox.sourceforge.net'):
  43                                         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))
  44                         sys.path.append(zpath + '/python')
  45                         return
  46                 print >>sys.stderr, "Using Zero Install, but failed to " \
  47                         "fetch", zpath, "-- trying non-0install system."
  48
  49         try:
  50                 path = os.environ['LIBDIRPATH']
  51                 paths = string.split(path, ':')
  52         except KeyError:
  53                 paths = [os.environ['HOME'] + '/lib',
  54                          '/usr/local/lib', '/usr/lib' ]
  55
  56         for p in paths:
  57                 p = os.path.join(p, 'ROX-Lib2')
  58                 if exists(p):
  59                         # TODO: check version is new enough
  60                         sys.path.append(os.path.join(p, 'python'))
  61                         import rox
  62                         if major == 1 and minor == 9 and micro < 10:
  63                                 return  # Can't check version
  64                         if not hasattr(rox, 'roxlib_version'):
  65                                 break
  66                         if (major, minor, micro) <= rox.roxlib_version:
  67                                 return  # OK
  68         report_error("This program needs ROX-Lib2 (version %d.%d.%d) " % \
  69                 (major, minor, micro) + "to run.\n" + \
  70                 "I tried all of these places:\n\n" + \
  71                 string.join(paths, '\n') + '\n\n' + \
  72                 "ROX-Lib2 is available from:\n" + \
  73                 "http://rox.sourceforge.net")
  74
  75 def report_error(err):
  76         "Write 'error' to stderr and, if possible, display a dialog box too."
  77         try:
  78                 sys.stderr.write('*** ' + err + '\n')
  79         except:
  80                 pass
  81         try:
  82                 import pygtk; pygtk.require('2.0')
  83                 import gtk; g = gtk
  84         except:
  85                 import gtk
  86                 win = gtk.GtkDialog()
  87                 message = gtk.GtkLabel(err +
  88                                 '\n\nAlso, pygtk2 needs to be present')
  89                 win.set_title('Missing ROX-Lib2')
  90                 win.set_position(gtk.WIN_POS_CENTER)
  91                 message.set_padding(20, 20)
  92                 win.vbox.pack_start(message)
  93
  94                 ok = gtk.GtkButton("OK")
  95                 ok.set_flags(gtk.CAN_DEFAULT)
  96                 win.action_area.pack_start(ok)
  97                 ok.connect('clicked', gtk.mainquit)
  98                 ok.grab_default()
  99
 100                 win.connect('destroy', gtk.mainquit)
 101                 win.show_all()
 102                 gtk.mainloop()
 103         else:
 104                 box = g.MessageDialog(None, g.MESSAGE_ERROR, 0,
 105                                         g.BUTTONS_OK, err)
 106                 box.set_title('Missing ROX-Lib2')
 107                 box.set_position(g.WIN_POS_CENTER)
 108                 box.set_default_response(g.RESPONSE_OK)
 109                 box.run()
 110         sys.exit(1)