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