utils.py

   1 import os, subprocess, shutil
   2 from logging import info, warn
   3
   4 from zeroinstall import SafeException
   5 from zeroinstall.injector import model, namespaces, gpg, iface_cache
   6 from zeroinstall.support import basedir, find_in_path
   7 from zeroinstall.zerostore import manifest
   8
   9 def escape_slashes(path):
  10         return path.replace('/', '#')
  11
  12 # From 0mirror
  13 def get_feed_path(feed):
  14         if '#' in feed:
  15                 raise SafeException("Invalid URL '%s'" % feed)
  16         scheme, rest = feed.split('://', 1)
  17         domain, rest = rest.split('/', 1)
  18         assert scheme in ('http', 'https', 'ftp')       # Just to check for mal-formed lines; add more as needed
  19         for x in [scheme, domain, rest]:
  20                 if not x or x.startswith(','):
  21                         raise SafeException("Invalid URL '%s'" % feed)
  22         return os.path.join('feeds', scheme, domain, escape_slashes(rest))
  23
  24 def get_gpg():
  25         return find_in_path('gpg') or find_in_path('gpg2')
  26
  27 def export_key(fingerprint, key_dir):
  28         key_path = os.path.join(key_dir, fingerprint[-16:] + '.gpg')
  29         child = subprocess.Popen([get_gpg(), '-a', '--export', fingerprint], stdout = subprocess.PIPE)
  30         keydata, unused = child.communicate()
  31         stream = file(key_path, 'w')
  32         stream.write(keydata)
  33         stream.close()
  34         info("Exported key %s", fingerprint)
  35
  36 class NoLocalVersions:
  37         def __init__(self, allow_package):
  38                 self.allow_package = allow_package
  39
  40         def meets_restriction(self, impl):
  41                 if isinstance(impl, model.ZeroInstallImplementation):
  42                         i = impl.id
  43                         return not (i.startswith('/') or i.startswith('.'))
  44                 # Accept package implementations to not deny ones that depend on it.
  45                 # Package implementations will be excluded from produced bundle later.
  46                 if impl.id.startswith('package:'):
  47                         return self.allow_package
  48                 return False
  49
  50 no_local = NoLocalVersions(True)
  51 no_local_or_package = NoLocalVersions(False)
  52
  53 class NoLocalRestrictions(dict):
  54         def __init__(self, uris):
  55                 self.uris = uris
  56
  57         # This restriction applies to all interfaces, so ignore key
  58         def get(self, key, default):
  59                 if key.uri in self.uris:
  60                         return [no_local_or_package]
  61                 else:
  62                         return [no_local]
  63
  64 def export_feeds(export_dir, feeds, keys_used):
  65         """Copy each feed (and icon) in feeds from the cache to export_dir.
  66         Add all signing key fingerprints to keys_used."""
  67         for feed in feeds:
  68                 if feed.startswith('/'):
  69                         info("Skipping local feed %s", feed)
  70                         continue
  71                 if feed.startswith('distribution:'):
  72                         info("Skipping distribution feed %s", feed)
  73                         continue
  74                 print "Exporting feed", feed
  75                 # Store feed
  76                 cached = basedir.load_first_cache(namespaces.config_site,
  77                                                   'interfaces',
  78                                                   model.escape(feed))
  79                 if cached:
  80                         feed_dir = os.path.join(export_dir, get_feed_path(feed))
  81                         feed_dst = os.path.join(feed_dir, 'latest.xml')
  82                         if not os.path.isdir(feed_dir):
  83                                 os.makedirs(feed_dir)
  84                         shutil.copyfile(cached, feed_dst)
  85                         info("Exported feed %s", feed)
  86
  87                         icon_path = iface_cache.iface_cache.get_icon_path(iface_cache.iface_cache.get_interface(feed))
  88                         if icon_path:
  89                                 icon_dst = os.path.join(feed_dir, 'icon.png')
  90                                 shutil.copyfile(icon_path, icon_dst)
  91
  92                         # Get the keys
  93                         stream = file(cached)
  94                         unused, sigs = gpg.check_stream(stream)
  95                         stream.close()
  96                         for x in sigs:
  97                                 if isinstance(x, gpg.ValidSig):
  98                                         keys_used.add(x.fingerprint)
  99                                 else:
 100                                         warn("Signature problem: %s" % x)
 101                 else:
 102                         warn("Feed not cached: %s", feed)
 103
 104 def get_implementation_path(impl):
 105         if impl.id.startswith('/'):
 106                 return impl.id
 107         stores = iface_cache.iface_cache.stores
 108         if hasattr(stores, 'lookup_any'):
 109                 # 0launch >= 0.45
 110                 return stores.lookup_any(impl.digests)
 111         return stores.lookup(impl.id)
 112
 113 # impls is a map {digest: Implementation}. Create an exported item called
 114 # "digest" with the cached implemention (even if we cached it under a different
 115 # digest).
 116 def export_impls(export_dir, impls):
 117         implementations = os.path.join(export_dir, 'implementations')
 118         for digest, impl in impls.iteritems():
 119                 print "Exporting implementation %s (%s %s)" % (impl, impl.feed.get_name(), impl.get_version())
 120                 # Store implementation
 121                 src = get_implementation_path(impl)
 122                 dst = os.path.join(implementations, digest)
 123                 shutil.copytree(src, dst, symlinks = True)
 124
 125                 # Regenerate the manifest, because it might be for a different algorithm
 126                 os.chmod(dst, 0755)
 127                 os.unlink(os.path.join(dst, '.manifest'))
 128                 alg_name, required_value = digest.split('=', 1)
 129                 alg = manifest.algorithms[alg_name]
 130                 actual = manifest.add_manifest_file(dst, alg).hexdigest()
 131                 assert actual == required_value, "Expected digest '%s', but found '%s'" % (required_value, actual)
 132
 133                 for root, dirs, files in os.walk(dst):
 134                         os.chmod(root, 0755)
 135                 os.unlink(os.path.join(dst, '.manifest'))
 136                 info("Exported implementation %s", impl)