annotate mupdf-source/thirdparty/curl/docs/CONTRIBUTE.md @ 40:aa33339d6b8a upstream

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author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 11:31:38 +0200
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1 # Contributing to the curl project
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3 This document is intended to offer guidelines on how to best contribute to the
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4 curl project. This concerns new features as well as corrections to existing
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5 flaws or bugs.
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7 ## Learning curl
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9 ### Join the Community
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11 Skip over to [https://curl.haxx.se/mail/](https://curl.haxx.se/mail/) and join
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12 the appropriate mailing list(s). Read up on details before you post
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13 questions. Read this file before you start sending patches! We prefer
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14 questions sent to and discussions being held on the mailing list(s), not sent
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15 to individuals.
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17 Before posting to one of the curl mailing lists, please read up on the
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18 [mailing list etiquette](https://curl.haxx.se/mail/etiquette.html).
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20 We also hang out on IRC in #curl on irc.freenode.net
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22 If you're at all interested in the code side of things, consider clicking
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23 'watch' on the [curl repo on github](https://github.com/curl/curl) to be
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24 notified of pull requests and new issues posted there.
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26 ### License and copyright
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28 When contributing with code, you agree to put your changes and new code under
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29 the same license curl and libcurl is already using unless stated and agreed
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30 otherwise.
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32 If you add a larger piece of code, you can opt to make that file or set of
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33 files to use a different license as long as they don't enforce any changes to
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34 the rest of the package and they make sense. Such "separate parts" can not be
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35 GPL licensed (as we don't want copyleft to affect users of libcurl) but they
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36 must use "GPL compatible" licenses (as we want to allow users to use libcurl
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37 properly in GPL licensed environments).
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39 When changing existing source code, you do not alter the copyright of the
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40 original file(s). The copyright will still be owned by the original creator(s)
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41 or those who have been assigned copyright by the original author(s).
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43 By submitting a patch to the curl project, you are assumed to have the right
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44 to the code and to be allowed by your employer or whatever to hand over that
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45 patch/code to us. We will credit you for your changes as far as possible, to
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46 give credit but also to keep a trace back to who made what changes. Please
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47 always provide us with your full real name when contributing!
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49 ### What To Read
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51 Source code, the man pages, the [INTERNALS
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52 document](https://curl.haxx.se/dev/internals.html),
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53 [TODO](https://curl.haxx.se/docs/todo.html),
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54 [KNOWN_BUGS](https://curl.haxx.se/docs/knownbugs.html) and the [most recent
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55 changes](https://curl.haxx.se/dev/sourceactivity.html) in git. Just lurking on
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56 the [curl-library mailing
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57 list](https://curl.haxx.se/mail/list.cgi?list=curl-library) will give you a
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58 lot of insights on what's going on right now. Asking there is a good idea too.
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60 ## Write a good patch
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62 ### Follow code style
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64 When writing C code, follow the
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65 [CODE_STYLE](https://curl.haxx.se/dev/code-style.html) already established in
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66 the project. Consistent style makes code easier to read and mistakes less
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67 likely to happen. Run `make checksrc` before you submit anything, to make sure
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68 you follow the basic style. That script doesn't verify everything, but if it
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69 complains you know you have work to do.
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71 ### Non-clobbering All Over
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73 When you write new functionality or fix bugs, it is important that you don't
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74 fiddle all over the source files and functions. Remember that it is likely
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75 that other people have done changes in the same source files as you have and
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76 possibly even in the same functions. If you bring completely new
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77 functionality, try writing it in a new source file. If you fix bugs, try to
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78 fix one bug at a time and send them as separate patches.
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80 ### Write Separate Changes
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81
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82 It is annoying when you get a huge patch from someone that is said to fix 511
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83 odd problems, but discussions and opinions don't agree with 510 of them - or
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84 509 of them were already fixed in a different way. Then the person merging
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85 this change needs to extract the single interesting patch from somewhere
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86 within the huge pile of source, and that creates a lot of extra work.
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88 Preferably, each fix that corrects a problem should be in its own patch/commit
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89 with its own description/commit message stating exactly what they correct so
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90 that all changes can be selectively applied by the maintainer or other
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91 interested parties.
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92
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93 Also, separate changes enable bisecting much better for tracking problems
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94 and regression in the future.
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96 ### Patch Against Recent Sources
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97
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98 Please try to get the latest available sources to make your patches against.
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99 It makes the lives of the developers so much easier. The very best is if you
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100 get the most up-to-date sources from the git repository, but the latest
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101 release archive is quite OK as well!
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102
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103 ### Documentation
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104
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105 Writing docs is dead boring and one of the big problems with many open source
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106 projects. But someone's gotta do it! It makes things a lot easier if you
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107 submit a small description of your fix or your new features with every
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108 contribution so that it can be swiftly added to the package documentation.
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109
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110 The documentation is always made in man pages (nroff formatted) or plain
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111 ASCII files. All HTML files on the web site and in the release archives are
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112 generated from the nroff/ASCII versions.
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113
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114 ### Test Cases
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115
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116 Since the introduction of the test suite, we can quickly verify that the main
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117 features are working as they're supposed to. To maintain this situation and
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118 improve it, all new features and functions that are added need to be tested
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119 in the test suite. Every feature that is added should get at least one valid
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120 test case that verifies that it works as documented. If every submitter also
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121 posts a few test cases, it won't end up as a heavy burden on a single person!
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122
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123 If you don't have test cases or perhaps you have done something that is very
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124 hard to write tests for, do explain exactly how you have otherwise tested and
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125 verified your changes.
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126
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127 ## Sharing Your Changes
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128
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129 ### How to get your changes into the main sources
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130
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131 Ideally you file a [pull request on
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132 github](https://github.com/curl/curl/pulls), but you can also send your plain
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133 patch to [the curl-library mailing
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134 list](https://curl.haxx.se/mail/list.cgi?list=curl-library).
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135
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136 Either way, your change will be reviewed and discussed there and you will be
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137 expected to correct flaws pointed out and update accordingly, or the change
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138 risks stalling and eventually just getting deleted without action. As a
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139 submitter of a change, you are the owner of that change until it has been merged.
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140
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141 Respond on the list or on github about the change and answer questions and/or
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142 fix nits/flaws. This is very important. We will take lack of replies as a
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143 sign that you're not very anxious to get your patch accepted and we tend to
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144 simply drop such changes.
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145
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146 ### About pull requests
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147
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148 With github it is easy to send a [pull
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149 request](https://github.com/curl/curl/pulls) to the curl project to have
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150 changes merged.
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151
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152 We strongly prefer pull requests to mailed patches, as it makes it a proper
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153 git commit that is easy to merge and they are easy to track and not that easy
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154 to loose in the flood of many emails, like they sometimes do on the mailing
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155 lists.
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156
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157 Every pull request submitted will automatically be tested in several different
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158 ways. Every pull request is verified for each of the following:
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159
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160 - ... it still builds, warning-free, on Linux and macOS, with both
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161 clang and gcc
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162 - ... it still builds fine on Windows with several MSVC versions
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163 - ... it still builds with cmake on Linux, with gcc and clang
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164 - ... it follows rudimentary code style rules
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165 - ... the test suite still runs 100% fine
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166 - ... the release tarball (the "dist") still works
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167 - ... it builds fine in-tree as well as out-of-tree
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168 - ... code coverage doesn't shrink drastically
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169
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170 If the pull-request fails one of these tests, it will show up as a red X and
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171 you are expected to fix the problem. If you don't understand when the issue is
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172 or have other problems to fix the complaint, just ask and other project
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173 members will likely be able to help out.
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174
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175 When you adjust your pull requests after review, consider squashing the
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176 commits so that we can review the full updated version more easily.
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177
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178 ### Making quality patches
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179
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180 Make the patch against as recent source versions as possible.
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181
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182 If you've followed the tips in this document and your patch still hasn't been
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183 incorporated or responded to after some weeks, consider resubmitting it to the
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184 list or better yet: change it to a pull request.
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185
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186 ### Write good commit messages
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187
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188 A short guide to how to write commit messages in the curl project.
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189
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190 ---- start ----
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191 [area]: [short line describing the main effect]
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192 -- empty line --
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193 [full description, no wider than 72 columns that describe as much as
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194 possible as to why this change is made, and possibly what things
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195 it fixes and everything else that is related]
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196 -- empty line --
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197 [Closes/Fixes #1234 - if this closes or fixes a github issue]
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198 [Bug: URL to source of the report or more related discussion]
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199 [Reported-by: John Doe - credit the reporter]
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200 [whatever-else-by: credit all helpers, finders, doers]
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201 ---- stop ----
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202
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203 Don't forget to use commit --author="" if you commit someone else's work, and
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204 make sure that you have your own user and email setup correctly in git before
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205 you commit
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206
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207 ### Write Access to git Repository
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208
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209 If you are a very frequent contributor, you may be given push access to the
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210 git repository and then you'll be able to push your changes straight into the
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211 git repo instead of sending changes as pull requests or by mail as patches.
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212
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213 Just ask if this is what you'd want. You will be required to have posted
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214 several high quality patches first, before you can be granted push access.
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215
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216 ### How To Make a Patch with git
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217
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218 You need to first checkout the repository:
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219
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220 git clone https://github.com/curl/curl.git
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221
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222 You then proceed and edit all the files you like and you commit them to your
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223 local repository:
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224
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225 git commit [file]
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226
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227 As usual, group your commits so that you commit all changes at once that
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228 constitute a logical change.
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229
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230 Once you have done all your commits and you're happy with what you see, you
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231 can make patches out of your changes that are suitable for mailing:
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232
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233 git format-patch remotes/origin/master
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234
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235 This creates files in your local directory named NNNN-[name].patch for each
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236 commit.
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237
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238 Now send those patches off to the curl-library list. You can of course opt to
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239 do that with the 'git send-email' command.
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240
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241 ### How To Make a Patch without git
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242
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243 Keep a copy of the unmodified curl sources. Make your changes in a separate
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244 source tree. When you think you have something that you want to offer the
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245 curl community, use GNU diff to generate patches.
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246
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247 If you have modified a single file, try something like:
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248
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249 diff -u unmodified-file.c my-changed-one.c > my-fixes.diff
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250
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251 If you have modified several files, possibly in different directories, you
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252 can use diff recursively:
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253
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254 diff -ur curl-original-dir curl-modified-sources-dir > my-fixes.diff
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255
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256 The GNU diff and GNU patch tools exist for virtually all platforms, including
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257 all kinds of Unixes and Windows:
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258
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259 For unix-like operating systems:
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260
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261 - [https://savannah.gnu.org/projects/patch/](https://savannah.gnu.org/projects/patch/)
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262 - [https://www.gnu.org/software/diffutils/](https://www.gnu.org/software/diffutils/)
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263
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264 For Windows:
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265
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266 - [https://gnuwin32.sourceforge.io/packages/patch.htm](https://gnuwin32.sourceforge.io/packages/patch.htm)
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267 - [https://gnuwin32.sourceforge.io/packages/diffutils.htm](https://gnuwin32.sourceforge.io/packages/diffutils.htm)