Source Code for Module zeroinstall.injector.writer

 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) 
75