support.py

   1 # Copyright (C) 2007, Thomas Leonard
   2 # See the README file for details, or visit http://0install.net.
   3
   4 import os, subprocess, shutil
   5 import urlparse, ftplib, httplib
   6 from zeroinstall import SafeException
   7 from zeroinstall.injector import model
   8 from logging import info
   9
  10 release_status_file = 'release-status'
  11
  12 def check_call(*args, **kwargs):
  13         exitstatus = subprocess.call(*args, **kwargs)
  14         if exitstatus != 0:
  15                 raise SafeException("Command failed with exit code %d:\n%s" % (exitstatus, ' '.join(args[0])))
  16
  17 def show_and_run(cmd, args):
  18         print "Executing: %s %s" % (cmd, ' '.join("[%s]" % x for x in args))
  19         check_call(['sh', '-c', cmd, '-'] + args)
  20
  21 def suggest_release_version(snapshot_version):
  22         """Given a snapshot version, suggest a suitable release version.
  23         >>> suggest_release_version('1.0-pre')
  24         '1.0'
  25         >>> suggest_release_version('0.9-post')
  26         '0.10'
  27         >>> suggest_release_version('3')
  28         Traceback (most recent call last):
  29                 ...
  30         SafeException: Version '3' is not a snapshot version (should end in -pre or -post)
  31         """
  32         version = model.parse_version(snapshot_version)
  33         mod = version[-1]
  34         if mod == 0:
  35                 raise SafeException("Version '%s' is not a snapshot version (should end in -pre or -post)" % snapshot_version)
  36         if mod > 0:
  37                 # -post, so increment the number
  38                 version[-2][-1] += 1
  39         version[-1] = 0 # Remove the modifier
  40         return model.format_version(version)
  41
  42 def publish(iface, **kwargs):
  43         args = [os.environ['0PUBLISH']]
  44         for k in kwargs:
  45                 value = kwargs[k]
  46                 if value is True:
  47                         args += ['--' + k.replace('_', '-')]
  48                 elif value is not None:
  49                         args += ['--' + k.replace('_', '-'), value]
  50         args.append(iface)
  51         info("Executing %s", args)
  52         check_call(args)
  53
  54 def get_singleton_impl(iface):
  55         impls = iface.implementations
  56         if len(impls) != 1:
  57                 raise SafeException("Local feed '%s' contains %d versions! I need exactly one!" % (iface.uri, len(impls)))
  58         return impls.values()[0]
  59
  60 def backup_if_exists(name):
  61         if not os.path.exists(name):
  62                 return
  63         backup = name + '~'
  64         if os.path.exists(backup):
  65                 print "(deleting old backup %s)" % backup
  66                 if os.path.isdir(backup):
  67                         shutil.rmtree(backup)
  68                 else:
  69                         os.unlink(backup)
  70         os.rename(name, backup)
  71         print "(renamed old %s as %s; will delete on next run)" % (name, backup)
  72
  73 def get_choice(options):
  74         while True:
  75                 choice = raw_input('/'.join(options) + ': ').lower()
  76                 if not choice: continue
  77                 for o in options:
  78                         if o.lower().startswith(choice):
  79                                 return o
  80
  81 def make_archive_name(feed_name, version):
  82         return feed_name.lower().replace(' ', '-') + '-' + version
  83
  84 def in_PATH(prog):
  85         for x in os.environ['PATH'].split(':'):
  86                 if os.path.isfile(os.path.join(x, prog)):
  87                         return True
  88         return False
  89
  90 def show_diff(from_dir, to_dir):
  91         for cmd in [['meld'], ['xxdiff'], ['diff', '-ur']]:
  92                 if in_PATH(cmd[0]):
  93                         code = os.spawnvp(os.P_WAIT, cmd[0], cmd + [from_dir, to_dir])
  94                         if code:
  95                                 print "WARNING: command %s failed with exit code %d" % (cmd, code)
  96                         return
  97
  98 class Status(object):
  99         __slots__ = ['old_snapshot_version', 'release_version', 'head_before_release', 'new_snapshot_version',
 100                      'head_at_release', 'created_archive', 'tagged', 'uploaded_archive', 'updated_master_feed']
 101         def __init__(self):
 102                 for name in self.__slots__:
 103                         setattr(self, name, None)
 104
 105                 if os.path.isfile(release_status_file):
 106                         for line in file(release_status_file):
 107                                 assert line.endswith('\n')
 108                                 line = line[:-1]
 109                                 name, value = line.split('=')
 110                                 setattr(self, name, value)
 111                                 info("Loaded status %s=%s", name, value)
 112
 113         def save(self):
 114                 tmp_name = release_status_file + '.new'
 115                 tmp = file(tmp_name, 'w')
 116                 try:
 117                         lines = ["%s=%s\n" % (name, getattr(self, name)) for name in self.__slots__ if getattr(self, name)]
 118                         tmp.write(''.join(lines))
 119                         tmp.close()
 120                         os.rename(tmp_name, release_status_file)
 121                         info("Wrote status to %s", release_status_file)
 122                 except:
 123                         os.unlink(tmp_name)
 124                         raise
 125
 126 def host(address):
 127         if hasattr(address, 'hostname'):
 128                 return address.hostname
 129         else:
 130                 return address[1].split(':', 1)[0]
 131
 132 def port(address):
 133         if hasattr(address, 'port'):
 134                 return address.port
 135         else:
 136                 port = address[1].split(':', 1)[1:]
 137                 if port:
 138                         return int(port[0])
 139                 else:
 140                         return None
 141
 142 def get_http_size(url, ttl = 1):
 143         assert url.lower().startswith('http://')
 144
 145         address = urlparse.urlparse(url)
 146         http = httplib.HTTPConnection(host(address), port(address) or 80)
 147
 148         parts = url.split('/', 3)
 149         if len(parts) == 4:
 150                 path = parts[3]
 151         else:
 152                 path = ''
 153
 154         http.request('HEAD', '/' + path, headers = {'Host': host(address)})
 155         response = http.getresponse()
 156         try:
 157                 if response.status == 200:
 158                         return response.getheader('Content-Length')
 159                 elif response.status in (301, 302):
 160                         new_url_rel = response.getheader('Location') or response.getheader('URI')
 161                         new_url = urlparse.urljoin(url, new_url_rel)
 162                 else:
 163                         raise SafeException("HTTP error: got status code %s" % response.status)
 164         finally:
 165                 response.close()
 166
 167         if ttl:
 168                 info("Resource moved! Checking new URL %s" % new_url)
 169                 assert new_url
 170                 return get_http_size(new_url, ttl - 1)
 171         else:
 172                 raise SafeException('Too many redirections.')
 173
 174 def get_ftp_size(url):
 175         address = urlparse.urlparse(url)
 176         ftp = ftplib.FTP(host(address))
 177         try:
 178                 ftp.login()
 179                 return ftp.size(url.split('/', 3)[3])
 180         finally:
 181                 ftp.close()
 182
 183 def get_size(url):
 184         scheme = urlparse.urlparse(url)[0].lower()
 185         if scheme.startswith('http'):
 186                 return get_http_size(url)
 187         elif scheme.startswith('ftp'):
 188                 return get_ftp_size(url)
 189         else:
 190                 raise SafeException("Unknown scheme '%s' in '%s'" % (scheme, url))