annotate Sphinx/source/developers/repositories.rst @ 599:1248dadca1cd

updated mercurial fingerprints
author Sebastien Jodogne <s.jodogne@gmail.com>
date Thu, 21 Jan 2021 08:42:20 +0100
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1 .. _repositories:
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2
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3 Accessing code repositories
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4 ===========================
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6 .. contents::
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8
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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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55
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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 = 72:F4:32:09:0F:F1:67:03:83:44:BF:0B:44:34:9D:B6:C6:0C:6A:32
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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 -servername hg.orthanc-server.com -connect hg.orthanc-server.com:443 \
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96 < /dev/null 2>/dev/null | openssl x509 -fingerprint -sha1 -noout -in /dev/stdin
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97
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98 **Important:** As our certificates are changed periodically, you'll
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99 have to regularly update your configuration file once Mercurial
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100 complains about an unexpected fingerprint.
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101
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102
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103 Recent versions of Mercurial
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104 ............................
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105
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106 .. highlight:: text
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107
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108 While cloning the repository, you might face an error similar to::
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109
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110 abort: error: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:661)
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111
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112 In such a case, you must explicitly add the cryptographic fingerprint
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113 of our code server using a more recent option than the
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114 ``hostfingerprints`` option. To this end, edit the `configuration file
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115 <https://www.mercurial-scm.org/doc/hgrc.5.html#files>`__ of Mercurial
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116 (by default on Microsoft Windows, ``%USERPROFILE%\Mercurial.ini``),
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117 and add the following lines::
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118
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119 [hostsecurity]
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120 hg.orthanc-server.com:fingerprints=sha256:74:24:16:D3:C8:22:45:7E:6B:00:6C:63:86:37:9F:A1:B1:04:A7:F4:3C:7E:5A:1A:68:0A:7A:AF:3B:1A:14:52
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121
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122 .. highlight:: bash
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123
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124 For reference, here is the command that was used to generate this
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125 SHA256 fingerprint (`click here for more information
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126 <https://stackoverflow.com/a/56579497/881731>`__)::
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127
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128 $ openssl s_client -servername hg.orthanc-server.com -connect hg.orthanc-server.com:443 \
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129 < /dev/null 2>/dev/null | openssl x509 -fingerprint -sha256 -noout -in /dev/stdin
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131
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132 Write access
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133 ^^^^^^^^^^^^
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134
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135 Only the core developers of Orthanc have direct write access to the
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136 Orthanc repositories (through SSH). Core developers can clone a
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137 repository with write access as follows::
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138
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139 $ hg clone ssh://hg@hg.orthanc-server.com/public/orthanc/
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140
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141
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142 .. _hg-contributing:
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143
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144 Submitting code
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145 ^^^^^^^^^^^^^^^
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146
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147 We will of course be extremely grateful for receiving external code
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148 contributions to the Orthanc repositories!
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149
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150 However, one of the weaknesses of our self-hosted infrastructure is
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151 that is does not support automation for `pull requests
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152 <https://en.wikipedia.org/wiki/Distributed_version_control#Pull_requests>`__.
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153 This section explains the `two accepted ways for communicating
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154 contributions
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155 <https://www.mercurial-scm.org/wiki/CommunicatingChanges>`__: by
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156 submitting a patch, or by exchanging a bundle.
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157
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158 Importantly, before any contribution can be accepted into the Orthanc
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159 repositories, its author must sign a :ref:`CLA <cla>`. This allows
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160 both the University Hospital of Liège and the Osimis company to act as
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161 the official guardians of the whole Orthanc ecosystem.
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162
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163 Also, make sure to read our :ref:`FAQ if submitting code
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164 <submitting_code>`.
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165
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166
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167 .. _hg-patch:
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168
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169 Simple patch (import/export)
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170 ............................
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171
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172 .. highlight:: bash
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173
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174 If you want to propose a simple contribution, the most direct way of
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175 passing it on the Orthanc community is by creating a **simple patch**.
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176
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177 First make sure to pull the latest version of the code repository,
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178 then work on your modification in the ``default`` branch (i.e. in the
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179 mainline code)::
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180
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181 $ hg pull
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182 $ hg up -c default
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183 [...make your modifications...]
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184
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185 Once your contribution is done, here is how to export a patch::
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186
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187 $ hg export -r default > /tmp/contribution.patch
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188
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189 Once the patch is ready, you can send the ``/tmp/contribution.patch``
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190 file to the Orthanc community, e.g. by submitting it onto our official
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191 `discussion group
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192 <https://groups.google.com/forum/#!forum/orthanc-users>`__. The core
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193 developers would reintegrate such a patch by typing the following
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194 command on their side::
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195
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196 $ hg pull
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197 $ hg up -c default
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198 $ hg import /tmp/contribution.patch
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199
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200 NB: If the ``hg export`` command was run on Microsoft Windows, one
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201 might have to convert the end-of-lines from DOS (CR/LF) to UNIX (LF
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202 only) using the ``dos2unix`` command on the patch file, before running
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203 ``hg import``. Otherwise, errors like ``Hunk #1 FAILED`` might show
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204 up.
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205
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206
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207 .. _hg-bundle:
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208
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209 Exchanging a bundle
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210 ...................
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211
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212 .. highlight:: bash
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213
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214 If your contribution is made of several changesets (commits), you
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215 should work in a dedicated branch, then submit a Mercurial bundle for
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216 this branch.
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217
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218 First make sure to pull the latest version of the code repository,
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219 then create a branch, say ``my-user/my-fix``, that derives from the
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220 ``default`` branch (which corresponds to the mainline code)::
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221
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222 $ hg pull
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223 $ hg up -c default
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224 $ hg branch my-user/my-fix
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225
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226 WARNING: Please chose an unique, explicit name for your branch, and
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227 make sure that your username is included within for traceability! The
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228 name ``my-user/my-fix`` is only here for the purpose of the example.
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229
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230 You can then do all the modifications as required (including ``hg
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231 add``, ``hg rm``, and ``hg commit``) in the branch
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232 ``my-user/my-fix``. When you're done, create a Mercurial bundle that
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233 gathers all your changes against the source repository as follows::
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234
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235 $ hg commit -m 'submitting my fix'
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236 $ hg bundle /tmp/contribution.bundle https://hg.orthanc-server.com/orthanc
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237
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238 Obviously, make sure to replace
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239 ``https://hg.orthanc-server.com/orthanc`` by the location of the
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240 source repository.
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241
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242 Finally, you can submit the file ``/tmp/contribution.bundle`` to the
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243 community, just like for simple patches. Note that this procedure
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244 inherently corresponds to the manual creation of a pull request.
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245
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246 The core developers would reintegrate such a bundle into the mainline
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247 by typing the following commands on their side::
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248
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249 $ cd /tmp
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250 $ hg clone https://hg.orthanc-server.com/orthanc/
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251 $ cd /tmp/orthanc
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252 $ hg unbundle /tmp/contribution.bundle
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253 $ hg up -c default
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254 $ hg merge my-user/my-fix
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255
339
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256
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257 Issue tracker
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258 -------------
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259
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260 The `official bug tracker <https://bugs.orthanc-server.com/>`__ of the
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261 Orthanc project runs thanks to `Bugzilla
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262 <https://en.wikipedia.org/wiki/Bugzilla>`__.
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263
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264 We have done our best to automatically import most of the history
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265 from the old BitBucket bug tracker.
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266
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267 Before posting any issue, make sure to carefully, completely read the
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268 :ref:`page about how to ask support <support>`. In particular, most
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269 issues should first be discussed on the dedicated `discussion group
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270 <https://groups.google.com/forum/#!forum/orthanc-users>`__ before
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271 introducing a bug report.