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1 # statichttprepo.py - simple http repository class for mercurial
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2 #
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3 # This provides read-only repo access to repositories exported via static http
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4 #
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5 # Copyright 2005-2007 Matt Mackall <mpm@selenic.com>
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6 #
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7 # This software may be used and distributed according to the terms of the
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8 # GNU General Public License version 2, incorporated herein by reference.
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9
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10 from i18n import _
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11 import changelog, byterange, url, error
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12 import localrepo, manifest, util, store
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13 import urllib, urllib2, errno
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14
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15 class httprangereader(object):
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16 def __init__(self, url, opener):
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17 # we assume opener has HTTPRangeHandler
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18 self.url = url
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19 self.pos = 0
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20 self.opener = opener
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21 def seek(self, pos):
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22 self.pos = pos
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23 def read(self, bytes=None):
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24 req = urllib2.Request(self.url)
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25 end = ''
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26 if bytes:
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27 end = self.pos + bytes - 1
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28 req.add_header('Range', 'bytes=%d-%s' % (self.pos, end))
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29
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30 try:
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31 f = self.opener.open(req)
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32 data = f.read()
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33 if hasattr(f, 'getcode'):
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34 # python 2.6+
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35 code = f.getcode()
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36 elif hasattr(f, 'code'):
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37 # undocumented attribute, seems to be set in 2.4 and 2.5
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38 code = f.code
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39 else:
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40 # Don't know how to check, hope for the best.
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41 code = 206
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42 except urllib2.HTTPError, inst:
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43 num = inst.code == 404 and errno.ENOENT or None
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44 raise IOError(num, inst)
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45 except urllib2.URLError, inst:
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46 raise IOError(None, inst.reason[1])
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47
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48 if code == 200:
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49 # HTTPRangeHandler does nothing if remote does not support
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50 # Range headers and returns the full entity. Let's slice it.
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51 if bytes:
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52 data = data[self.pos:self.pos + bytes]
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53 else:
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54 data = data[self.pos:]
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55 elif bytes:
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56 data = data[:bytes]
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57 self.pos += len(data)
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58 return data
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59
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60 def build_opener(ui, authinfo):
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61 # urllib cannot handle URLs with embedded user or passwd
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62 urlopener = url.opener(ui, authinfo)
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63 urlopener.add_handler(byterange.HTTPRangeHandler())
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64
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65 def opener(base):
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66 """return a function that opens files over http"""
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67 p = base
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68 def o(path, mode="r"):
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69 f = "/".join((p, urllib.quote(path)))
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70 return httprangereader(f, urlopener)
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71 return o
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72
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73 return opener
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74
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75 class statichttprepository(localrepo.localrepository):
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76 def __init__(self, ui, path):
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77 self._url = path
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78 self.ui = ui
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79
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80 self.path, authinfo = url.getauthinfo(path.rstrip('/') + "/.hg")
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81
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82 opener = build_opener(ui, authinfo)
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83 self.opener = opener(self.path)
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84
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85 # find requirements
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86 try:
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87 requirements = self.opener("requires").read().splitlines()
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88 except IOError, inst:
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89 if inst.errno != errno.ENOENT:
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90 raise
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91 # check if it is a non-empty old-style repository
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92 try:
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93 self.opener("00changelog.i").read(1)
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94 except IOError, inst:
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95 if inst.errno != errno.ENOENT:
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96 raise
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97 # we do not care about empty old-style repositories here
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98 msg = _("'%s' does not appear to be an hg repository") % path
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99 raise error.RepoError(msg)
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100 requirements = []
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101
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102 # check them
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103 for r in requirements:
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104 if r not in self.supported:
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105 raise error.RepoError(_("requirement '%s' not supported") % r)
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106
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107 # setup store
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108 def pjoin(a, b):
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109 return a + '/' + b
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110 self.store = store.store(requirements, self.path, opener, pjoin)
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111 self.spath = self.store.path
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112 self.sopener = self.store.opener
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113 self.sjoin = self.store.join
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114
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115 self.manifest = manifest.manifest(self.sopener)
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116 self.changelog = changelog.changelog(self.sopener)
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117 self.tagscache = None
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118 self.nodetagscache = None
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119 self.encodepats = None
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120 self.decodepats = None
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121
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122 def url(self):
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123 return self._url
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124
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125 def local(self):
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126 return False
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127
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128 def lock(self, wait=True):
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129 raise util.Abort(_('cannot lock static-http repository'))
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130
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131 def instance(ui, path, create):
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132 if create:
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133 raise util.Abort(_('cannot create new static-http repository'))
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134 return statichttprepository(ui, path[7:])
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