zeroinstall/injector/distro.py

   1 """
   2 Integration with native distribution package managers.
   3 @since: 0.28
   4 """
   5
   6 # Copyright (C) 2007, Thomas Leonard
   7 # See the README file for details, or visit http://0install.net.
   8
   9 import os, re
  10 from logging import warn, info
  11 from zeroinstall.injector import namespaces, basedir, model
  12
  13 dotted_ints = '[0-9]+(\.[0-9]+)*'
  14 version_regexp = '(%s)(-(pre|rc|post|)%s)*' % (dotted_ints, dotted_ints)
  15
  16 def try_cleanup_distro_version(version):
  17         """Try to turn a distribution version string into one readable by Zero Install.
  18         We do this by stripping off anything we can't parse.
  19         @return: the part we understood, or None if we couldn't parse anything
  20         @rtype: str"""
  21         match = re.match(version_regexp, version)
  22         if match:
  23                 return match.group(0)
  24         return None
  25
  26 class Distribution(object):
  27         """Represents a distribution with which we can integrate.
  28         Sub-classes should specialise this to integrate with the package managers of
  29         particular distributions. This base class ignores the native package manager.
  30         @since: 0.28
  31         """
  32
  33         def get_package_info(self, package, factory):
  34                 """Get information about the given package.
  35                 Add zero or more implementations using the factory (typically at most two
  36                 will be added; the currently installed version and the latest available).
  37                 @param package: package name (e.g. "gimp")
  38                 @type package: str
  39                 @param factory: function for creating new DistributionImplementation objects from IDs
  40                 @type factory: str -> L{model.DistributionImplementation}
  41                 """
  42                 return
  43
  44 class DebianDistribution(Distribution):
  45         def __init__(self, db_dir):
  46                 self.db_dir = db_dir
  47                 dpkg_status = db_dir + '/status'
  48                 self.status_details = os.stat(self.db_dir + '/status')
  49
  50                 self.versions = {}
  51                 self.cache_dir = basedir.save_cache_path(namespaces.config_site, namespaces.config_prog)
  52
  53                 try:
  54                         self.load_cache()
  55                 except Exception, ex:
  56                         info("Failed to load dpkg cache (%s). Regenerating...", ex)
  57                         try:
  58                                 self.generate_cache()
  59                                 self.load_cache()
  60                         except Exception, ex:
  61                                 warn("Failed to regenerate dpkg cache: %s", ex)
  62
  63         def load_cache(self):
  64                 stream = file(self.cache_dir + '/dpkg-status.cache')
  65
  66                 for line in stream:
  67                         if line == '\n':
  68                                 break
  69                         name, value = line.split(': ')
  70                         if name == 'mtime' and int(value) != int(self.status_details.st_mtime):
  71                                 raise Exception("Modification time of dpkg status file has changed")
  72                         if name == 'size' and int(value) != self.status_details.st_size:
  73                                 raise Exception("Size of dpkg status file has changed")
  74                 else:
  75                         raise Exception('Invalid cache format (bad header)')
  76
  77                 versions = self.versions
  78                 for line in stream:
  79                         package, version = line[:-1].split('\t')
  80                         versions[package] = version
  81
  82         def generate_cache(self):
  83                 cache = []
  84
  85                 for line in os.popen("dpkg-query -W"):
  86                         package, version = line.split('\t', 1)
  87                         if ':' in version:
  88                                 # Debian's 'epoch' system
  89                                 version = version.split(':', 1)[1]
  90                         clean_version = try_cleanup_distro_version(version)
  91                         if clean_version:
  92                                 cache.append('%s\t%s' % (package, clean_version))
  93                         else:
  94                                 warn("Can't parse distribution version '%s' for package '%s'", version, package)
  95
  96                 cache.sort()    # Might be useful later; currently we don't care
  97
  98                 import tempfile
  99                 fd, tmpname = tempfile.mkstemp(prefix = 'dpkg-cache-tmp', dir = self.cache_dir)
 100                 try:
 101                         stream = os.fdopen(fd, 'wb')
 102                         stream.write('mtime: %d\n' % int(self.status_details.st_mtime))
 103                         stream.write('size: %d\n' % self.status_details.st_size)
 104                         stream.write('\n')
 105                         for line in cache:
 106                                 stream.write(line + '\n')
 107                         stream.close()
 108
 109                         os.rename(tmpname, self.cache_dir + '/dpkg-status.cache')
 110                 except:
 111                         os.unlink(tmpname)
 112                         raise
 113
 114         def get_package_info(self, package, factory):
 115                 try:
 116                         version = self.versions[package]
 117                 except KeyError:
 118                         return
 119
 120                 impl = factory('package:deb:%s:%s' % (package, version))
 121                 impl.version = model.parse_version(version)
 122
 123 class RPMDistribution(Distribution):
 124         cache_leaf = 'rpm-status.cache'
 125
 126         def __init__(self, db_dir):
 127                 self.db_dir = db_dir
 128                 pkg_status = os.path.join(db_dir, 'Packages')
 129                 self.status_details = os.stat(pkg_status)
 130
 131                 self.versions = {}
 132                 self.cache_dir=basedir.save_cache_path(namespaces.config_site,
 133                                                        namespaces.config_prog)
 134
 135                 try:
 136                         self.load_cache()
 137                 except Exception, ex:
 138                         info("Failed to load cache (%s). Regenerating...",
 139                              ex)
 140                         try:
 141                                 self.generate_cache()
 142                                 self.load_cache()
 143                         except Exception, ex:
 144                                 warn("Failed to regenerate cache: %s", ex)
 145
 146         def load_cache(self):
 147                 stream = file(os.path.join(self.cache_dir, self.cache_leaf))
 148
 149                 for line in stream:
 150                         if line == '\n':
 151                                 break
 152                         name, value = line.split(': ')
 153                         if name == 'mtime' and (int(value) !=
 154                                             int(self.status_details.st_mtime)):
 155                                 raise Exception("Modification time of rpm status file has changed")
 156                         if name == 'size' and (int(value) !=
 157                                                self.status_details.st_size):
 158                                 raise Exception("Size of rpm status file has changed")
 159                 else:
 160                         raise Exception('Invalid cache format (bad header)')
 161
 162                 versions = self.versions
 163                 for line in stream:
 164                         package, version = line[:-1].split('\t')
 165                         versions[package] = version
 166
 167         def __parse_rpm_name(self, line):
 168                 """Some samples we have to cope with (from SuSE 10.2):
 169                 mp3blaster-3.2.0-0.pm0
 170                 fuse-2.5.2-2.pm.0
 171                 gpg-pubkey-1abd1afb-450ef738
 172                 a52dec-0.7.4-3.pm.1
 173                 glibc-html-2.5-25
 174                 gnome-backgrounds-2.16.1-14
 175                 gnome-icon-theme-2.16.0.1-12
 176                 opensuse-quickstart_en-10.2-9
 177                 susehelp_en-2006.06.20-25
 178                 yast2-schema-2.14.2-3"""
 179
 180                 parts=line.strip().split('-')
 181                 if len(parts)==2:
 182                         return parts[0], try_cleanup_distro_version(parts[1])
 183
 184                 elif len(parts)<2:
 185                         return None, None
 186
 187                 package='-'.join(parts[:-2])
 188                 version=parts[-2]
 189                 mod=parts[-1]
 190
 191                 return package, try_cleanup_distro_version(version+'-'+mod)
 192
 193         def generate_cache(self):
 194                 cache = []
 195
 196                 for line in os.popen("rpm -qa"):
 197                         package, version = self.__parse_rpm_name(line)
 198                         if package and version:
 199                                 cache.append('%s\t%s' % (package, version))
 200
 201                 cache.sort()   # Might be useful later; currently we don't care
 202
 203                 import tempfile
 204                 fd, tmpname = tempfile.mkstemp(prefix = 'rpm-cache-tmp',
 205                                                dir = self.cache_dir)
 206                 try:
 207                         stream = os.fdopen(fd, 'wb')
 208                         stream.write('mtime: %d\n' % int(self.status_details.st_mtime))
 209                         stream.write('size: %d\n' % self.status_details.st_size)
 210                         stream.write('\n')
 211                         for line in cache:
 212                                 stream.write(line + '\n')
 213                         stream.close()
 214
 215                         os.rename(tmpname,
 216                                   os.path.join(self.cache_dir,
 217                                                self.cache_leaf))
 218                 except:
 219                         os.unlink(tmpname)
 220                         raise
 221
 222         def get_package_info(self, package, factory):
 223                 try:
 224                         version = self.versions[package]
 225                 except KeyError:
 226                         return
 227
 228                 impl = factory('package:rpm:%s:%s' % (package, version))
 229                 impl.version = model.parse_version(version)
 230
 231 _host_distribution = None
 232 def get_host_distribution():
 233         global _host_distribution
 234         if not _host_distribution:
 235                 _dpkg_db_dir = '/var/lib/dpkg'
 236                 _rpm_db_dir = '/var/lib/rpm'
 237
 238                 if os.access(_dpkg_db_dir, os.R_OK | os.X_OK):
 239                         _host_distribution = DebianDistribution(_dpkg_db_dir)
 240                 elif os.path.isdir(_rpm_db_dir):
 241                         _host_distribution = RPMDistribution(_rpm_db_dir)
 242                 else:
 243                         _host_distribution = Distribution()
 244
 245         return _host_distribution