annotate hgext/infinitepush/store.py @ 40910:4bb6195755b1

test: enable sparse-revlog for test-ssh-proto-unbundle.t We are about to enable sparse-revlog globally. To help with reviewing the tests change, we isolate them in individual changesets. Differential Revision: https://phab.mercurial-scm.org/D5337
author Boris Feld <boris.feld@octobus.net>
date Mon, 12 Nov 2018 01:17:05 +0100
parents 090e5f3900b7
children 2372284d9457
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1 # This software may be used and distributed according to the terms of the
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2 # GNU General Public License version 2 or any later version.
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3
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4 # based on bundleheads extension by Gregory Szorc <gps@mozilla.com>
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5
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6 from __future__ import absolute_import
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7
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8 import abc
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9 import hashlib
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10 import os
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11 import subprocess
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12 import tempfile
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13
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14 from mercurial import (
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15 node,
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16 pycompat,
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17 )
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18 from mercurial.utils import (
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19 procutil,
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20 )
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21
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22 NamedTemporaryFile = tempfile.NamedTemporaryFile
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23
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24 class BundleWriteException(Exception):
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25 pass
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26
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27 class BundleReadException(Exception):
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28 pass
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29
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30 class abstractbundlestore(object):
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31 """Defines the interface for bundle stores.
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32
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33 A bundle store is an entity that stores raw bundle data. It is a simple
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34 key-value store. However, the keys are chosen by the store. The keys can
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35 be any Python object understood by the corresponding bundle index (see
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36 ``abstractbundleindex`` below).
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37 """
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38 __metaclass__ = abc.ABCMeta
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39
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40 @abc.abstractmethod
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41 def write(self, data):
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42 """Write bundle data to the store.
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43
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44 This function receives the raw data to be written as a str.
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45 Throws BundleWriteException
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46 The key of the written data MUST be returned.
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47 """
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48
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49 @abc.abstractmethod
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50 def read(self, key):
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51 """Obtain bundle data for a key.
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52
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53 Returns None if the bundle isn't known.
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54 Throws BundleReadException
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55 The returned object should be a file object supporting read()
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56 and close().
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57 """
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58
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59 class filebundlestore(object):
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60 """bundle store in filesystem
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61
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62 meant for storing bundles somewhere on disk and on network filesystems
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63 """
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64 def __init__(self, ui, repo):
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65 self.ui = ui
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66 self.repo = repo
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67 self.storepath = ui.configpath('scratchbranch', 'storepath')
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68 if not self.storepath:
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69 self.storepath = self.repo.vfs.join("scratchbranches",
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70 "filebundlestore")
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71 if not os.path.exists(self.storepath):
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72 os.makedirs(self.storepath)
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73
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74 def _dirpath(self, hashvalue):
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75 """First two bytes of the hash are the name of the upper
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76 level directory, next two bytes are the name of the
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77 next level directory"""
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78 return os.path.join(self.storepath, hashvalue[0:2], hashvalue[2:4])
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79
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80 def _filepath(self, filename):
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81 return os.path.join(self._dirpath(filename), filename)
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82
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83 def write(self, data):
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84 filename = node.hex(hashlib.sha1(data).digest())
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85 dirpath = self._dirpath(filename)
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86
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87 if not os.path.exists(dirpath):
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88 os.makedirs(dirpath)
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89
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90 with open(self._filepath(filename), 'wb') as f:
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91 f.write(data)
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92
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93 return filename
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94
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95 def read(self, key):
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96 try:
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97 with open(self._filepath(key), 'rb') as f:
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98 return f.read()
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99 except IOError:
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100 return None
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101
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102 class externalbundlestore(abstractbundlestore):
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103 def __init__(self, put_binary, put_args, get_binary, get_args):
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104 """
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105 `put_binary` - path to binary file which uploads bundle to external
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106 storage and prints key to stdout
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107 `put_args` - format string with additional args to `put_binary`
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108 {filename} replacement field can be used.
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109 `get_binary` - path to binary file which accepts filename and key
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110 (in that order), downloads bundle from store and saves it to file
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111 `get_args` - format string with additional args to `get_binary`.
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112 {filename} and {handle} replacement field can be used.
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113 """
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114
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115 self.put_args = put_args
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116 self.get_args = get_args
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117 self.put_binary = put_binary
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118 self.get_binary = get_binary
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119
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120 def _call_binary(self, args):
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121 p = subprocess.Popen(
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122 pycompat.rapply(procutil.tonativestr, args),
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123 stdout=subprocess.PIPE, stderr=subprocess.PIPE,
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124 close_fds=True)
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125 stdout, stderr = p.communicate()
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126 returncode = p.returncode
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127 return returncode, stdout, stderr
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128
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129 def write(self, data):
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130 # Won't work on windows because you can't open file second time without
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131 # closing it
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132 # TODO: rewrite without str.format() and replace NamedTemporaryFile()
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133 # with pycompat.namedtempfile()
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134 with NamedTemporaryFile() as temp:
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135 temp.write(data)
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136 temp.flush()
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137 temp.seek(0)
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138 formatted_args = [arg.format(filename=temp.name)
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139 for arg in self.put_args]
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140 returncode, stdout, stderr = self._call_binary(
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141 [self.put_binary] + formatted_args)
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142
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143 if returncode != 0:
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144 raise BundleWriteException(
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145 'Failed to upload to external store: %s' % stderr)
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146 stdout_lines = stdout.splitlines()
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147 if len(stdout_lines) == 1:
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148 return stdout_lines[0]
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149 else:
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150 raise BundleWriteException(
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151 'Bad output from %s: %s' % (self.put_binary, stdout))
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152
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153 def read(self, handle):
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154 # Won't work on windows because you can't open file second time without
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155 # closing it
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156 # TODO: rewrite without str.format() and replace NamedTemporaryFile()
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157 # with pycompat.namedtempfile()
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158 with NamedTemporaryFile() as temp:
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159 formatted_args = [arg.format(filename=temp.name, handle=handle)
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160 for arg in self.get_args]
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161 returncode, stdout, stderr = self._call_binary(
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162 [self.get_binary] + formatted_args)
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163
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164 if returncode != 0:
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165 raise BundleReadException(
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166 'Failed to download from external store: %s' % stderr)
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167 return temp.read()