Mercurial > hg
annotate hgext/infinitepush/store.py @ 43085:eef9a2d67051
py3: manually import pycompat.open into files that need it
We want to eliminate the source transformer. Currently it inserts
a `from mercurial.pycompat import ...` at the top of files to alias
some builtins.
This commit replaces the implicit import of `open` with an explicit
import on files that need it and changes the source transformer to
no longer import `open`.
As part of this, we needed to store an explicit local for `open` in
the Python 2 code path in `pycompat` so the import works. (Builtins
that are automatically in scope cannot be imported.)
Differential Revision: https://phab.mercurial-scm.org/D7005
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Sun, 06 Oct 2019 13:28:56 -0400 |
parents | 687b865b95ad |
children | 70d42e2ad9b4 |
rev | line source |
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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.pycompat import open |
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15 from mercurial import ( |
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16 node, |
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17 pycompat, |
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18 ) |
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19 from mercurial.utils import procutil |
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20 |
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21 NamedTemporaryFile = tempfile.NamedTemporaryFile |
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22 |
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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 |
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28 class BundleReadException(Exception): |
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29 pass |
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30 |
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31 |
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32 class abstractbundlestore(object): |
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33 """Defines the interface for bundle stores. |
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34 |
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35 A bundle store is an entity that stores raw bundle data. It is a simple |
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36 key-value store. However, the keys are chosen by the store. The keys can |
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37 be any Python object understood by the corresponding bundle index (see |
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38 ``abstractbundleindex`` below). |
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39 """ |
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40 |
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41 __metaclass__ = abc.ABCMeta |
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42 |
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43 @abc.abstractmethod |
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44 def write(self, data): |
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45 """Write bundle data to the store. |
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46 |
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47 This function receives the raw data to be written as a str. |
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48 Throws BundleWriteException |
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49 The key of the written data MUST be returned. |
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50 """ |
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51 |
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52 @abc.abstractmethod |
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53 def read(self, key): |
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54 """Obtain bundle data for a key. |
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55 |
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56 Returns None if the bundle isn't known. |
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57 Throws BundleReadException |
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58 The returned object should be a file object supporting read() |
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59 and close(). |
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60 """ |
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61 |
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62 |
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63 class filebundlestore(object): |
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64 """bundle store in filesystem |
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65 |
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66 meant for storing bundles somewhere on disk and on network filesystems |
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67 """ |
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68 |
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69 def __init__(self, ui, repo): |
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70 self.ui = ui |
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71 self.repo = repo |
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72 self.storepath = ui.configpath(b'scratchbranch', b'storepath') |
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73 if not self.storepath: |
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74 self.storepath = self.repo.vfs.join( |
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75 b"scratchbranches", b"filebundlestore" |
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76 ) |
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77 if not os.path.exists(self.storepath): |
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78 os.makedirs(self.storepath) |
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79 |
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80 def _dirpath(self, hashvalue): |
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81 """First two bytes of the hash are the name of the upper |
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82 level directory, next two bytes are the name of the |
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83 next level directory""" |
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84 return os.path.join(self.storepath, hashvalue[0:2], hashvalue[2:4]) |
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85 |
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86 def _filepath(self, filename): |
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87 return os.path.join(self._dirpath(filename), filename) |
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88 |
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89 def write(self, data): |
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90 filename = node.hex(hashlib.sha1(data).digest()) |
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91 dirpath = self._dirpath(filename) |
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92 |
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93 if not os.path.exists(dirpath): |
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94 os.makedirs(dirpath) |
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95 |
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96 with open(self._filepath(filename), b'wb') as f: |
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97 f.write(data) |
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98 |
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99 return filename |
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100 |
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101 def read(self, key): |
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102 try: |
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103 with open(self._filepath(key), b'rb') as f: |
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104 return f.read() |
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105 except IOError: |
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106 return None |
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107 |
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108 |
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109 class externalbundlestore(abstractbundlestore): |
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110 def __init__(self, put_binary, put_args, get_binary, get_args): |
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111 """ |
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112 `put_binary` - path to binary file which uploads bundle to external |
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113 storage and prints key to stdout |
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114 `put_args` - format string with additional args to `put_binary` |
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115 {filename} replacement field can be used. |
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116 `get_binary` - path to binary file which accepts filename and key |
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117 (in that order), downloads bundle from store and saves it to file |
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118 `get_args` - format string with additional args to `get_binary`. |
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119 {filename} and {handle} replacement field can be used. |
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120 """ |
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121 |
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122 self.put_args = put_args |
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123 self.get_args = get_args |
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124 self.put_binary = put_binary |
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125 self.get_binary = get_binary |
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126 |
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127 def _call_binary(self, args): |
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128 p = subprocess.Popen( |
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129 pycompat.rapply(procutil.tonativestr, args), |
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130 stdout=subprocess.PIPE, |
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131 stderr=subprocess.PIPE, |
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132 close_fds=True, |
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133 ) |
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134 stdout, stderr = p.communicate() |
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135 returncode = p.returncode |
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136 return returncode, stdout, stderr |
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137 |
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138 def write(self, data): |
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139 # Won't work on windows because you can't open file second time without |
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140 # closing it |
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141 # TODO: rewrite without str.format() and replace NamedTemporaryFile() |
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142 # with pycompat.namedtempfile() |
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143 with NamedTemporaryFile() as temp: |
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144 temp.write(data) |
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145 temp.flush() |
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146 temp.seek(0) |
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147 formatted_args = [ |
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148 arg.format(filename=temp.name) for arg in self.put_args |
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149 ] |
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150 returncode, stdout, stderr = self._call_binary( |
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151 [self.put_binary] + formatted_args |
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152 ) |
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153 |
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154 if returncode != 0: |
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155 raise BundleWriteException( |
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156 b'Failed to upload to external store: %s' % stderr |
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157 ) |
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158 stdout_lines = stdout.splitlines() |
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159 if len(stdout_lines) == 1: |
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160 return stdout_lines[0] |
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161 else: |
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162 raise BundleWriteException( |
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163 b'Bad output from %s: %s' % (self.put_binary, stdout) |
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164 ) |
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165 |
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166 def read(self, handle): |
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167 # Won't work on windows because you can't open file second time without |
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168 # closing it |
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169 # TODO: rewrite without str.format() and replace NamedTemporaryFile() |
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170 # with pycompat.namedtempfile() |
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171 with NamedTemporaryFile() as temp: |
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172 formatted_args = [ |
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173 arg.format(filename=temp.name, handle=handle) |
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174 for arg in self.get_args |
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175 ] |
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176 returncode, stdout, stderr = self._call_binary( |
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177 [self.get_binary] + formatted_args |
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178 ) |
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179 |
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180 if returncode != 0: |
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181 raise BundleReadException( |
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182 b'Failed to download from external store: %s' % stderr |
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183 ) |
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184 return temp.read() |