archive.py

   1 from xml.dom import minidom
   2 from zeroinstall import SafeException
   3 from zeroinstall.zerostore import Store, manifest
   4 try:
   5         from zeroinstall.zerostore import unpack
   6 except ImportError:
   7         # Older versions don't have it
   8         import unpack
   9 from zeroinstall.injector import namespaces
  10 import os, time, re, shutil, tempfile
  11
  12 def manifest_for_dir(dir, alg):
  13         if alg == 'sha1':
  14                 # (for older versions of the injector)
  15                 import sha
  16                 class SHA1:
  17                         def new_digest(self): return sha.new()
  18                         def generate_manifest(self, dir): return manifest.generate_manifest(dir)
  19                         def getID(self, digest): return 'sha1=' + digest.hexdigest()
  20                 algorithm = SHA1()
  21         else:
  22                 algorithm = manifest.get_algorithm(alg)
  23
  24         digest = algorithm.new_digest()
  25         for line in algorithm.generate_manifest(dir):
  26                 digest.update(line + '\n')
  27         return algorithm.getID(digest)
  28
  29 def autopackage_get_start_offset(package):
  30         for line in file(package):
  31                 if line.startswith('export dataSize=') or line.startswith('export data_size='):
  32                         return os.path.getsize(package) - int(line.split('"', 2)[1])
  33         raise Exception("Can't find payload in autopackage (missing 'dataSize')")
  34
  35 def add_archive(data, url, local_file, extract, alg):
  36         if local_file is None:
  37                 local_file = os.path.abspath(os.path.basename(url))
  38                 if not os.path.exists(local_file):
  39                         raise SafeException("Use --archive-file option to specify a local copy of the archive "
  40                                         "(default file '%s' does not exist)" % local_file)
  41
  42         doc = minidom.parseString(data)
  43
  44         if alg is None:
  45                 alg = 'sha1new'
  46
  47         if local_file.endswith('.package'):
  48                 start_offset = autopackage_get_start_offset(local_file)
  49                 type = 'application/x-bzip-compressed-tar'
  50         else:
  51                 start_offset = 0
  52                 type = None
  53
  54         all_impls = doc.documentElement.getElementsByTagNameNS(namespaces.XMLNS_IFACE, 'implementation')
  55         tmpdir = tempfile.mkdtemp('-0publish')
  56         try:
  57                 if start_offset or type:
  58                         unpack.unpack_archive(url, file(local_file), tmpdir, extract, start_offset = start_offset, type = type)
  59                 else:
  60                         unpack.unpack_archive(url, file(local_file), tmpdir, extract)
  61                 if extract:
  62                         extracted = os.path.join(tmpdir, extract)
  63                 else:
  64                         extracted = tmpdir
  65
  66                 archive_id = manifest_for_dir(extracted, alg)
  67         finally:
  68                 shutil.rmtree(tmpdir)
  69
  70         local_ifaces = []
  71         for impl in all_impls:
  72                 this_id = impl.getAttribute('id')
  73                 if this_id == archive_id:
  74                         break
  75                 if this_id.startswith('/') or this_id.startswith('.'):
  76                         local_ifaces.append(impl)
  77         else:
  78                 if len(local_ifaces) == 0:
  79                         raise Exception('Nothing with id "%s", and no local implementations' % archive_id)
  80                 if len(local_ifaces) > 1:
  81                         raise Exception('Nothing with id "%s", and multiple local implementations!' % archive_id)
  82                 impl = local_ifaces[0]
  83                 impl.setAttribute('id', archive_id)
  84
  85         assert impl.getAttribute('id') == archive_id
  86
  87         nl = doc.createTextNode('\n      ')
  88         impl.appendChild(nl)
  89
  90         archive = doc.createElementNS(namespaces.XMLNS_IFACE, 'archive')
  91         impl.appendChild(archive)
  92         archive.setAttribute('href', url)
  93         archive.setAttribute('size', str(os.stat(local_file).st_size - start_offset))
  94         if extract is not None:
  95                 archive.setAttribute('extract', extract)
  96         if start_offset:
  97                 archive.setAttribute('start-offset', str(start_offset))
  98         if type:
  99                 archive.setAttribute('type', type)
 100
 101         nl = doc.createTextNode('\n    ')
 102         impl.appendChild(nl)
 103
 104         return doc.toxml()