0alias

   1 #!/usr/bin/env python
   2 import os, sys
   3 from optparse import OptionParser
   4
   5 from zeroinstall.injector import reader, model
   6
   7 first_path = os.environ['PATH'].split(':')[0]
   8
   9 parser = OptionParser(usage="usage: %%prog [options] alias interface\n\n"
  10                 "Creates a script in the first directory in $PATH\n"
  11                 "(%s) to run 'interface'." % first_path)
  12 parser.add_option("-V", "--version", help="display version information", action='store_true')
  13 parser.disable_interspersed_args()
  14
  15 (options, args) = parser.parse_args()
  16
  17 if options.version:
  18         import zeroinstall
  19         print "0alias (zero-install) " + zeroinstall.version
  20         print "Copyright (C) 2005 Thomas Leonard"
  21         print "This program comes with ABSOLUTELY NO WARRANTY,"
  22         print "to the extent permitted by law."
  23         print "You may redistribute copies of this program"
  24         print "under the terms of the GNU General Public License."
  25         print "For more information about these matters, see the file named COPYING."
  26         sys.exit(0)
  27
  28 if len(args) != 2:
  29         parser.print_help()
  30         sys.exit(1)
  31
  32 alias, interface_uri = args
  33
  34 interface = model.Interface(interface_uri)
  35 if not reader.update_from_cache(interface):
  36         print >>sys.stderr, "Interface '%s' not currently in cache. Fetching..." % interface_uri
  37         if os.spawnlp(os.P_WAIT, '0launch', '0launch', '-d', interface_uri):
  38                 print >>sys.stderr, "0launch failed"
  39                 sys.exit(1)
  40         if not reader.update_from_cache(interface):
  41                 print >>sys.stderr, "Interface still not in cache. Aborting."
  42                 sys.exit(1)
  43
  44 if not os.access(first_path, os.W_OK):
  45         print >>sys.stderr, ("Directory '%s' is not writable.\n" % first_path) + \
  46                 "0alias uses the first directory in $PATH, which is currently:\n" + \
  47                 os.environ['PATH']
  48         sys.exit(1)
  49
  50 script = os.path.join(first_path, alias)
  51 if os.path.exists(script):
  52         print >>sys.stderr, "File '%s' already exists. Delete it first." % script
  53         sys.exit(1)
  54
  55 wrapper = file(script, 'w')
  56 assert "'" not in interface_uri
  57 assert "\\" not in interface_uri
  58 print >>wrapper, '''#!/bin/sh
  59 if [ "$*" = "--versions" ]; then
  60   exec 0launch -gd '%s' "$@"
  61 else
  62   exec 0launch '%s' "$@"
  63 fi''' % (interface_uri, interface_uri)
  64
  65 # Make new script executable
  66 os.chmod(script, 0111 | os.fstat(wrapper.fileno()).st_mode)
  67 wrapper.close()
  68
  69 print "Created script '%s'." % script
  70 print "To edit policy: %s --versions" % alias
  71 print "(note: some shells require you to type 'rehash' now)"