zeroinstall/injector/writer.py

   1 """
   2 Save per-interface and per-feed configuration information.
   3 """
   4
   5 # Copyright (C) 2009, Thomas Leonard
   6 # See the README file for details, or visit http://0install.net.
   7
   8 from zeroinstall import _
   9 import os
  10 from xml.dom import minidom, XMLNS_NAMESPACE
  11
  12 from zeroinstall.support import basedir
  13
  14 from zeroinstall.injector import model
  15 from zeroinstall.injector.namespaces import config_site, config_prog, XMLNS_IFACE
  16
  17 def _atomic_save(doc, parent, uri):
  18         import tempfile
  19         tmp_fd, tmp_name = tempfile.mkstemp(dir = parent)
  20         try:
  21                 tmp_file = os.fdopen(tmp_fd, 'w')
  22                 doc.writexml(tmp_file, addindent = " ", newl = '\n')
  23                 tmp_file.close()
  24                 path = os.path.join(parent, model._pretty_escape(uri))
  25                 os.rename(tmp_name, path)
  26         except:
  27                 os.unlink(tmp_name)
  28                 raise
  29
  30 def save_feed(feed):
  31         """Save information about a feed. Currently, this is the last_checked time and any user-set stability ratings.
  32         @since: 0.49"""
  33         feeds = basedir.save_config_path(config_site, config_prog, 'feeds')
  34
  35         impl = minidom.getDOMImplementation()
  36         doc = impl.createDocument(XMLNS_IFACE, 'feed-preferences', None)
  37         root = doc.documentElement
  38         root.setAttributeNS(XMLNS_NAMESPACE, 'xmlns', XMLNS_IFACE)
  39
  40         if feed.last_checked:
  41                 root.setAttribute('last-checked', str(feed.last_checked))
  42
  43         impls = feed.implementations.values()
  44         impls.sort()
  45         for impl in impls:
  46                 if impl.user_stability:
  47                         node = doc.createElementNS(XMLNS_IFACE, 'implementation')
  48                         root.appendChild(node)
  49                         node.setAttribute('user-stability', str(impl.user_stability))
  50                         node.setAttribute('id', impl.id)
  51
  52         _atomic_save(doc, feeds, feed.url)
  53
  54 def save_interface(interface):
  55         user_overrides = basedir.save_config_path(config_site, config_prog, 'interfaces')
  56
  57         impl = minidom.getDOMImplementation()
  58         doc = impl.createDocument(XMLNS_IFACE, 'interface-preferences', None)
  59
  60         root = doc.documentElement
  61         root.setAttributeNS(XMLNS_NAMESPACE, 'xmlns', XMLNS_IFACE)
  62         root.setAttribute('uri', interface.uri)
  63
  64         if interface.stability_policy:
  65                 root.setAttribute('stability-policy', str(interface.stability_policy))
  66
  67         for feed in interface.extra_feeds:
  68                 if feed.user_override:
  69                         elem = doc.createElementNS(XMLNS_IFACE, 'feed')
  70                         root.appendChild(elem)
  71                         elem.setAttribute('src', feed.uri)
  72                         if feed.arch:
  73                                 elem.setAttribute('arch', feed.arch)
  74
  75         _atomic_save(doc, user_overrides, interface.uri)