annotate Sphinx/source/developers/repositories.rst @ 521:a3c98aa2b94a

update mercurial fingerprint
author Sebastien Jodogne <s.jodogne@gmail.com>
date Wed, 14 Oct 2020 12:55:32 +0200
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1 .. _repositories:
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3 Accessing code repositories
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4 ===========================
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6 .. contents::
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9 Context
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10 -------
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11
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12 The Orthanc server and most of its plugins are versioned using
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13 `Mercurial <https://en.wikipedia.org/wiki/Mercurial>`__ on a
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14 `self-hosted server <https://hg.orthanc-server.com/>`__.
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15
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16 The Orthanc project started back in 2011, back in a time where
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17 Mercurial and `Git <https://en.wikipedia.org/wiki/Git>`__ were equally
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18 popular. Sébastien Jodogne, the original author of Orthanc, decided to
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19 use Mercurial given the higher simplicity of its set of commands, and
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20 given the fact it is safer to use for less experienced users.
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21
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22 As pointed out on `Wikipedia
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23 <https://en.wikipedia.org/wiki/Mercurial>`__, the *"Git vs. Mercurial
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24 [debate] has become one of the holy wars of hacker culture."* We
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25 certainly don't want to endure this debate in the context of the
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26 Orthanc ecosystem. The fact is that a distributed revision-control
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27 was needed for Orthanc, and that both Git and Mercurial have a similar
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28 set of features.
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29
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30 If Orthanc were started in 2020, maybe we would have used Git, or
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31 maybe not. But the Orthanc ecosystem is not at all about versioning
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32 systems. We want to be entirely dedicated to lowering barriers to
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33 entry in the field of medical imaging. As a consequence, the choice of
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34 Mercurial should be considered as a part of the history, and we simply
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35 ask people to accept it as a fact.
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36
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37 Regarding the reason behind self-hosting, Orthanc was hosted on
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38 `Google Code
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39 <https://en.wikipedia.org/wiki/Google_Developers#Google_Code>`__
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40 between 2012 and 2015, until it was shutdown. In July 2015, Orthanc
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41 was moved to `Bitbucket by Atlassian
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42 <https://en.wikipedia.org/wiki/Bitbucket>`__. Unfortunately, in July
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43 2019, Bitbucket announced that `Mercurial support would be dropped on
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44 June 2020
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45 <https://bitbucket.org/blog/sunsetting-mercurial-support-in-bitbucket>`__,
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46 forcing us to deal with another migration.
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47
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48 We are of course grateful to Google and Atlassian for having hosted
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49 Orthanc during 8 years. However, we cannot afford the cost of
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50 periodically coping with hosting migrations. We prefer to have a
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51 simpler environment, yet under our full control. As a consequence,
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52 starting Q2 2020, Orthanc is hosted using the official ``hg serve``
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53 tool.
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56 Accessing Mercurial
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57 -------------------
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58
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59 .. _hg-clone:
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60
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61 Read-only access
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62 ^^^^^^^^^^^^^^^^
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63
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64 Anybody has full read-only access to all of the Orthanc official
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65 repositories, on our `self-hosted server
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66 <https://hg.orthanc-server.com/>`__. As the ``hg serve`` tool that is
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67 used by our Web server tends to be slow, we recommend people to
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68 locally clone our Mercurial repositories.
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70 .. highlight:: bash
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71
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72 Locally cloning one of those Mercurial repositories (say, the main
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73 ``orthanc`` repository) is as simple as typing::
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74
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75 $ hg clone https://hg.orthanc-server.com/orthanc/
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76
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77 You can then use separate tools such as `TortoiseHg
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78 <https://en.wikipedia.org/wiki/TortoiseHg>`__ to browse the code with
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79 richer features than the Web interface.
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80
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81 .. highlight:: text
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82
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83 You might have to set up a host fingerprint in the Mercurial
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84 configuration. Add the following lines to your ``~/.hgrc`` file::
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85
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86 [hostfingerprints]
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87 hg.orthanc-server.com = 5D:28:35:52:52:F9:D1:1C:C1:B5:CF:47:F0:9C:F8:1D:B0:4D:F1:BD
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88
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89 .. highlight:: bash
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90
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91 For reference, here is the command that was used to generate this SHA1
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92 fingerprint (`click here for more information
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93 <https://wiki.fluidproject.org/display/fluid/Setting+Host+Fingerprints+for+Mercurial>`__)::
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94
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95 $ openssl s_client -connect hg.orthanc-server.com:443 < /dev/null 2>/dev/null | openssl x509 -fingerprint -sha1 -noout -in /dev/stdin
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96
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97 **Important:** As our certificates are changed periodically, you'll
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98 have to regularly update your configuration file once Mercurial
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99 complains about an unexpected fingerprint.
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100
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101
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102 Recent versions of Mercurial
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103 ............................
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104
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105 .. highlight:: text
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106
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107 While cloning the repository, you might face an error similar to::
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108
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109 abort: error: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:661)
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110
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111 In such a case, you must explicitly add the cryptographic fingerprint
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112 of our code server using a more recent option than the
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113 ``hostfingerprints`` option. To this end, edit the `configuration file
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114 <https://www.mercurial-scm.org/doc/hgrc.5.html#files>`__ of Mercurial
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115 (by default on Microsoft Windows, ``%USERPROFILE%\Mercurial.ini``),
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116 and add the following lines::
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117
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118 [hostsecurity]
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119 hg.orthanc-server.com:fingerprints=sha256:F4:E2:A3:2A:77:C7:E3:13:70:2C:41:EA:84:80:6B:C0:D4:84:47:B9:EF:B9:9D:B4:A6:85:43:C4:FA:8D:27:E3
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121 .. highlight:: bash
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122
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123 For reference, here is the command that was used to generate this
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124 SHA256 fingerprint (`click here for more information
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125 <https://stackoverflow.com/a/56579497/881731>`__)::
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126
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127 $ openssl s_client -connect hg.orthanc-server.com:443 < /dev/null 2>/dev/null | openssl x509 -fingerprint -sha256 -noout -in /dev/stdin
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129
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130 Write access
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131 ^^^^^^^^^^^^
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132
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133 Only the core developers of Orthanc have direct write access to the
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134 Orthanc repositories (through SSH). Core developers can clone a
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135 repository with write access as follows::
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136
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137 $ hg clone ssh://hg@hg.orthanc-server.com/public/orthanc/
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138
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139
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140 .. _hg-contributing:
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141
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142 Submitting code
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143 ^^^^^^^^^^^^^^^
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144
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145 We will of course be extremely grateful for receiving external code
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146 contributions to the Orthanc repositories!
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147
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148 However, one of the weaknesses of our self-hosted infrastructure is
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149 that is does not support automation for `pull requests
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150 <https://en.wikipedia.org/wiki/Distributed_version_control#Pull_requests>`__.
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151 This section explains the `two accepted ways for communicating
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152 contributions
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153 <https://www.mercurial-scm.org/wiki/CommunicatingChanges>`__: by
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154 submitting a patch, or by exchanging a bundle.
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155
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156 Importantly, before any contribution can be accepted into the Orthanc
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157 repositories, its author must sign a :ref:`CLA <cla>`. This allows
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158 both the University Hospital of Liège and the Osimis company to act as
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159 the official guardians of the whole Orthanc ecosystem.
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160
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161 Also, make sure to read our :ref:`FAQ if submitting code
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162 <submitting_code>`.
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163
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164
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165 .. _hg-patch:
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166
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167 Simple patch (import/export)
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168 ............................
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169
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170 .. highlight:: bash
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171
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172 If you want to propose a simple contribution, the most direct way of
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173 passing it on the Orthanc community is by creating a **simple patch**.
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174
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175 First make sure to pull the latest version of the code repository,
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176 then work on your modification in the ``default`` branch (i.e. in the
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177 mainline code)::
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178
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179 $ hg pull
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180 $ hg up -c default
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181 [...make your modifications...]
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182
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183 Once your contribution is done, here is how to export a patch::
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184
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185 $ hg export -r default > /tmp/contribution.patch
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186
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187 Once the patch is ready, you can send the ``/tmp/contribution.patch``
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188 file to the Orthanc community, e.g. by submitting it onto our official
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189 `discussion group
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190 <https://groups.google.com/forum/#!forum/orthanc-users>`__. The core
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191 developers would reintegrate such a patch by typing the following
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192 command on their side::
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193
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194 $ hg pull
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195 $ hg up -c default
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196 $ hg import /tmp/contribution.patch
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197
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198
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199 .. _hg-bundle:
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200
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201 Exchanging a bundle
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202 ...................
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203
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204 .. highlight:: bash
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205
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206 If your contribution is made of several changesets (commits), you
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207 should work in a dedicated branch, then submit a Mercurial bundle for
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208 this branch.
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209
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210 First make sure to pull the latest version of the code repository,
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211 then create a branch, say ``my-user/my-fix``, that derives from the
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212 ``default`` branch (which corresponds to the mainline code)::
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213
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214 $ hg pull
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215 $ hg up -c default
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216 $ hg branch my-user/my-fix
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217
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218 WARNING: Please chose an unique, explicit name for your branch, and
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219 make sure that your username is included within for traceability! The
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220 name ``my-user/my-fix`` is only here for the purpose of the example.
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221
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222 You can then do all the modifications as required (including ``hg
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223 add``, ``hg rm``, and ``hg commit``) in the branch
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224 ``my-user/my-fix``. When you're done, create a Mercurial bundle that
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225 gathers all your changes against the source repository as follows::
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226
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227 $ hg commit -m 'submitting my fix'
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228 $ hg bundle /tmp/contribution.bundle https://hg.orthanc-server.com/orthanc
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229
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230 Obviously, make sure to replace
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231 ``https://hg.orthanc-server.com/orthanc`` by the location of the
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232 source repository.
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233
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234 Finally, you can submit the file ``/tmp/contribution.bundle`` to the
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235 community, just like for simple patches. Note that this procedure
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236 inherently corresponds to the manual creation of a pull request.
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237
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238 The core developers would reintegrate such a bundle into the mainline
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239 by typing the following commands on their side::
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240
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241 $ cd /tmp
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242 $ hg clone https://hg.orthanc-server.com/orthanc/
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243 $ cd /tmp/orthanc
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244 $ hg unbundle /tmp/contribution.bundle
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245 $ hg up -c default
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246 $ hg merge my-user/my-fix
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247
339
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248
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249 Issue tracker
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250 -------------
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251
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252 The `official bug tracker <https://bugs.orthanc-server.com/>`__ of the
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253 Orthanc project runs thanks to `Bugzilla
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254 <https://en.wikipedia.org/wiki/Bugzilla>`__.
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255
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256 We have done our best to automatically import most of the history
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257 from the old BitBucket bug tracker.
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258
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259 Before posting any issue, make sure to carefully, completely read the
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260 :ref:`page about how to ask support <support>`. In particular, most
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261 issues should first be discussed on the dedicated `discussion group
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262 <https://groups.google.com/forum/#!forum/orthanc-users>`__ before
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263 introducing a bug report.