2246 lines
103 KiB
HTML
2246 lines
103 KiB
HTML
<!DOCTYPE html>
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<html xmlns="http://www.w3.org/1999/xhtml" lang="en">
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<head>
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<meta charset="UTF-8"/>
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<meta http-equiv="X-UA-Compatible" content="IE=edge"/>
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<meta name="viewport" content="width=device-width, initial-scale=1.0"/>
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<meta name="generator" content="Asciidoctor 2.0.23"/>
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<title>My First Contribution to the Git Project</title>
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<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Open+Sans:300,300italic,400,400italic,600,600italic%7CNoto+Serif:400,400italic,700,700italic%7CDroid+Sans+Mono:400,700"/>
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<style>
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/*! Asciidoctor default stylesheet | MIT License | https://asciidoctor.org */
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/* Uncomment the following line when using as a custom stylesheet */
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<style>
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pre>code {
|
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display: inline;
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}
|
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</style>
|
|
</head>
|
|
<body class="article">
|
|
<div id="header">
|
|
<h1>My First Contribution to the Git Project</h1>
|
|
</div>
|
|
<div id="content">
|
|
<div class="sect1">
|
|
<h2 id="summary"><a class="anchor" href="#summary"></a>Summary</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph">
|
|
<p>This is a tutorial demonstrating the end-to-end workflow of creating a change to
|
|
the Git tree, sending it for review, and making changes based on comments.</p>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="prerequisites"><a class="anchor" href="#prerequisites"></a>Prerequisites</h3>
|
|
<div class="paragraph">
|
|
<p>This tutorial assumes you’re already fairly familiar with using Git to manage
|
|
source code. The Git workflow steps will largely remain unexplained.</p>
|
|
</div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="related-reading"><a class="anchor" href="#related-reading"></a>Related Reading</h3>
|
|
<div class="paragraph">
|
|
<p>This tutorial aims to summarize the following documents, but the reader may find
|
|
useful additional context:</p>
|
|
</div>
|
|
<div class="ulist">
|
|
<ul>
|
|
<li>
|
|
<p><code>Documentation/SubmittingPatches</code></p>
|
|
</li>
|
|
<li>
|
|
<p><code>Documentation/howto/new-command.adoc</code></p>
|
|
</li>
|
|
</ul>
|
|
</div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="getting-help"><a class="anchor" href="#getting-help"></a>Getting Help</h3>
|
|
<div class="paragraph">
|
|
<p>If you get stuck, you can seek help in the following places.</p>
|
|
</div>
|
|
<div class="sect3">
|
|
<h4 id="_gitvger_kernel_org"><a class="anchor" href="#_gitvger_kernel_org"></a><a href="mailto:git@vger.kernel.org">git@vger.kernel.org</a></h4>
|
|
<div class="paragraph">
|
|
<p>This is the main Git project mailing list where code reviews, version
|
|
announcements, design discussions, and more take place. Those interested in
|
|
contributing are welcome to post questions here. The Git list requires
|
|
plain-text-only emails and prefers inline and bottom-posting when replying to
|
|
mail; you will be CC’d in all replies to you. Optionally, you can subscribe to
|
|
the list by sending an email to <<a href="mailto:git+subscribe@vger.kernel.org">git+subscribe@vger.kernel.org</a>>
|
|
(see <a href="https://subspace.kernel.org/subscribing.html" class="bare">https://subspace.kernel.org/subscribing.html</a> for details).
|
|
The <a href="https://lore.kernel.org/git">archive</a> of this mailing list is
|
|
available to view in a browser.</p>
|
|
</div>
|
|
</div>
|
|
<div class="sect3">
|
|
<h4 id="_git_mentoringgooglegroups_com"><a class="anchor" href="#_git_mentoringgooglegroups_com"></a><a href="https://groups.google.com/forum/#!forum/git-mentoring">git-mentoring@googlegroups.com</a></h4>
|
|
<div class="paragraph">
|
|
<p>This mailing list is targeted to new contributors and was created as a place to
|
|
post questions and receive answers outside of the public eye of the main list.
|
|
Veteran contributors who are especially interested in helping mentor newcomers
|
|
are present on the list. In order to avoid search indexers, group membership is
|
|
required to view messages; anyone can join and no approval is required.</p>
|
|
</div>
|
|
</div>
|
|
<div class="sect3">
|
|
<h4 id="_git_devel_on_libera_chat"><a class="anchor" href="#_git_devel_on_libera_chat"></a><a href="https://web.libera.chat/#git-devel">#git-devel</a> on Libera Chat</h4>
|
|
<div class="paragraph">
|
|
<p>This IRC channel is for conversations between Git contributors. If someone is
|
|
currently online and knows the answer to your question, you can receive help
|
|
in real time. Otherwise, you can read the
|
|
<a href="https://colabti.org/irclogger/irclogger_logs/git-devel">scrollback</a> to see
|
|
whether someone answered you. IRC does not allow offline private messaging, so
|
|
if you try to private message someone and then log out of IRC, they cannot
|
|
respond to you. It’s better to ask your questions in the channel so that you
|
|
can be answered if you disconnect and so that others can learn from the
|
|
conversation.</p>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="getting-started"><a class="anchor" href="#getting-started"></a>Getting Started</h2>
|
|
<div class="sectionbody">
|
|
<div class="sect2">
|
|
<h3 id="cloning"><a class="anchor" href="#cloning"></a>Clone the Git Repository</h3>
|
|
<div class="paragraph">
|
|
<p>Git is mirrored in a number of locations. Clone the repository from one of them;
|
|
<a href="https://git-scm.com/downloads" class="bare">https://git-scm.com/downloads</a> suggests one of the best places to clone from is
|
|
the mirror on GitHub.</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>$ git clone https://github.com/git/git git
|
|
$ cd git</pre>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="dependencies"><a class="anchor" href="#dependencies"></a>Installing Dependencies</h3>
|
|
<div class="paragraph">
|
|
<p>To build Git from source, you need to have a handful of dependencies installed
|
|
on your system. For a hint of what’s needed, you can take a look at
|
|
<code>INSTALL</code>, paying close attention to the section about Git’s dependencies on
|
|
external programs and libraries. That document mentions a way to "test-drive"
|
|
our freshly built Git without installing; that’s the method we’ll be using in
|
|
this tutorial.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Make sure that your environment has everything you need by building your brand
|
|
new clone of Git from the above step:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>$ make</pre>
|
|
</div>
|
|
</div>
|
|
<div class="admonitionblock note">
|
|
<table>
|
|
<tr>
|
|
<td class="icon">
|
|
<div class="title">Note</div>
|
|
</td>
|
|
<td class="content">
|
|
The Git build is parallelizable. <code>-j</code># is not included above but you can
|
|
use it as you prefer, here and elsewhere.
|
|
</td>
|
|
</tr>
|
|
</table>
|
|
</div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="identify-problem"><a class="anchor" href="#identify-problem"></a>Identify Problem to Solve</h3>
|
|
<div class="paragraph">
|
|
<p>In this tutorial, we will add a new command, <code>git</code> <code>psuh</code>, short for “Pony Saying
|
|
‘Um, Hello”’ - a feature which has gone unimplemented despite a high frequency
|
|
of invocation during users' typical daily workflow.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>(We’ve seen some other effort in this space with the implementation of popular
|
|
commands such as <code>sl</code>.)</p>
|
|
</div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="setup-workspace"><a class="anchor" href="#setup-workspace"></a>Set Up Your Workspace</h3>
|
|
<div class="paragraph">
|
|
<p>Let’s start by making a development branch to work on our changes. Per
|
|
<code>Documentation/SubmittingPatches</code>, since a brand new command is a new feature,
|
|
it’s fine to base your work on <code>master</code>. However, in the future for bugfixes,
|
|
etc., you should check that document and base it on the appropriate branch.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>For the purposes of this document, we will base all our work on the <code>master</code>
|
|
branch of the upstream project. Create the <code>psuh</code> branch you will use for
|
|
development like so:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>$ git checkout -b psuh origin/master</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>We’ll make a number of commits here in order to demonstrate how to send a topic
|
|
with multiple patches up for review simultaneously.</p>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="code-it-up"><a class="anchor" href="#code-it-up"></a>Code It Up!</h2>
|
|
<div class="sectionbody">
|
|
<div class="admonitionblock note">
|
|
<table>
|
|
<tr>
|
|
<td class="icon">
|
|
<div class="title">Note</div>
|
|
</td>
|
|
<td class="content">
|
|
A reference implementation can be found at
|
|
<a href="https://github.com/nasamuffin/git/tree/psuh" class="bare">https://github.com/nasamuffin/git/tree/psuh</a>.
|
|
</td>
|
|
</tr>
|
|
</table>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="add-new-command"><a class="anchor" href="#add-new-command"></a>Adding a New Command</h3>
|
|
<div class="paragraph">
|
|
<p>Lots of the subcommands are written as builtins, which means they are
|
|
implemented in C and compiled into the main <code>git</code> executable. Implementing the
|
|
very simple <code>psuh</code> command as a built-in will demonstrate the structure of the
|
|
codebase, the internal API, and the process of working together as a contributor
|
|
with the reviewers and maintainer to integrate this change into the system.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Built-in subcommands are typically implemented in a function named "cmd_"
|
|
followed by the name of the subcommand, in a source file named after the
|
|
subcommand and contained within <code>builtin/</code>. So it makes sense to implement your
|
|
command in <code>builtin/psuh.c</code>. Create that file, and within it, write the entry
|
|
point for your command in a function matching the style and signature:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>int cmd_psuh(int argc, const char **argv, const char *prefix)</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>We’ll also need to add the declaration of psuh; open up <code>builtin.h</code>, find the
|
|
declaration for <code>cmd_pull</code>, and add a new line for <code>psuh</code> immediately before it,
|
|
in order to keep the declarations alphabetically sorted:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>int cmd_psuh(int argc, const char **argv, const char *prefix);</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Be sure to #include "builtin.<code>h</code>" in your <code>psuh.c</code>. You’ll also need to
|
|
#include "gettext.<code>h</code>" to use functions related to printing output text.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Go ahead and add some throwaway printf to the <code>cmd_psuh</code> function. This is a
|
|
decent starting point as we can now add build rules and register the command.</p>
|
|
</div>
|
|
<div class="admonitionblock note">
|
|
<table>
|
|
<tr>
|
|
<td class="icon">
|
|
<div class="title">Note</div>
|
|
</td>
|
|
<td class="content">
|
|
Your throwaway text, as well as much of the text you will be adding over
|
|
the course of this tutorial, is user-facing. That means it needs to be
|
|
localizable. Take a look at <code>po/README</code> under "Marking strings for translation".
|
|
Throughout the tutorial, we will mark strings for translation as necessary; you
|
|
should also do so when writing your user-facing commands in the future.
|
|
</td>
|
|
</tr>
|
|
</table>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>int cmd_psuh(int argc, const char **argv, const char *prefix)
|
|
{
|
|
printf(_("Pony saying hello goes here.\n"));
|
|
return 0;
|
|
}</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Let’s try to build it. Open <code>Makefile</code>, find where <code>builtin/pull.o</code> is added
|
|
to <code>BUILTIN_OBJS</code>, and add <code>builtin/psuh.o</code> in the same way next to it in
|
|
alphabetical order. Once you’ve done so, move to the top-level directory and
|
|
build simply with <code>make</code>. Also add the <code>DEVELOPER=1</code> variable to turn on
|
|
some additional warnings:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>$ echo DEVELOPER=1 >config.mak
|
|
$ make</pre>
|
|
</div>
|
|
</div>
|
|
<div class="admonitionblock note">
|
|
<table>
|
|
<tr>
|
|
<td class="icon">
|
|
<div class="title">Note</div>
|
|
</td>
|
|
<td class="content">
|
|
When you are developing the Git project, it’s preferred that you use the
|
|
<code>DEVELOPER</code> flag; if there’s some reason it doesn’t work for you, you can turn
|
|
it off, but it’s a good idea to mention the problem to the mailing list.
|
|
</td>
|
|
</tr>
|
|
</table>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Great, now your new command builds happily on its own. But nobody invokes it.
|
|
Let’s change that.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>The list of commands lives in <code>git.c</code>. We can register a new command by adding
|
|
a <code>cmd_struct</code> to the <code>commands</code>[] array. <code>struct</code> <code>cmd_struct</code> takes a string
|
|
with the command name, a function pointer to the command implementation, and a
|
|
setup option flag. For now, let’s keep mimicking <code>push</code>. Find the line where
|
|
<code>cmd_push</code> is registered, copy it, and modify it for <code>cmd_psuh</code>, placing the new
|
|
line in alphabetical order (immediately before <code>cmd_pull</code>).</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>The options are documented in <code>builtin.h</code> under "Adding a new built-in." Since
|
|
we hope to print some data about the user’s current workspace context later,
|
|
we need a Git directory, so choose <code>RUN_SETUP</code> as your only option.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Go ahead and build again. You should see a clean build, so let’s kick the tires
|
|
and see if it works. There’s a binary you can use to test with in the
|
|
<code>bin-wrappers</code> directory.</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>$ ./bin-wrappers/git psuh</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Check it out! You’ve got a command! Nice work! Let’s commit this.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p><code>git</code> <code>status</code> reveals modified <code>Makefile</code>, <code>builtin.h</code>, and <code>git.c</code> as well as
|
|
untracked <code>builtin/psuh.c</code> and <code>git-psuh</code>. First, let’s take care of the binary,
|
|
which should be ignored. Open .<code>gitignore</code> in your editor, find <code>/git-pull</code>, and
|
|
add an entry for your new command in alphabetical order:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>...
|
|
/git-prune-packed
|
|
/git-psuh
|
|
/git-pull
|
|
/git-push
|
|
/git-quiltimport
|
|
/git-range-diff
|
|
...</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Checking <code>git</code> <code>status</code> again should show that <code>git-psuh</code> has been removed from
|
|
the untracked list and .<code>gitignore</code> has been added to the modified list. Now we
|
|
can stage and commit:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>$ git add Makefile builtin.h builtin/psuh.c git.c .gitignore
|
|
$ git commit -s</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>You will be presented with your editor in order to write a commit message. Start
|
|
the commit with a 50-column or less subject line, including the name of the
|
|
component you’re working on, followed by a blank line (always required) and then
|
|
the body of your commit message, which should provide the bulk of the context.
|
|
Remember to be explicit and provide the "Why" of your change, especially if it
|
|
couldn’t easily be understood from your diff. When editing your commit message,
|
|
don’t remove the <code>Signed-off-by</code> trailer which was added by <code>-s</code> above.</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>psuh: add a built-in by popular demand
|
|
|
|
Internal metrics indicate this is a command many users expect to be
|
|
present. So here's an implementation to help drive customer
|
|
satisfaction and engagement: a pony which doubtfully greets the user,
|
|
or, a Pony Saying "Um, Hello" (PSUH).
|
|
|
|
This commit message is intentionally formatted to 72 columns per line,
|
|
starts with a single line as "commit message subject" that is written as
|
|
if to command the codebase to do something (add this, teach a command
|
|
that). The body of the message is designed to add information about the
|
|
commit that is not readily deduced from reading the associated diff,
|
|
such as answering the question "why?".
|
|
|
|
Signed-off-by: A U Thor <author@example.com></pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Go ahead and inspect your new commit with <code>git</code> <code>show</code>. "psuh:" indicates you
|
|
have modified mainly the <code>psuh</code> command. The subject line gives readers an idea
|
|
of what you’ve changed. The sign-off line (<code>-s</code>) indicates that you agree to
|
|
the Developer’s Certificate of Origin 1.1 (see the
|
|
<code>Documentation/SubmittingPatches</code> [[dco]] header).</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>For the remainder of the tutorial, the subject line only will be listed for the
|
|
sake of brevity. However, fully-fleshed example commit messages are available
|
|
on the reference implementation linked at the top of this document.</p>
|
|
</div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="implementation"><a class="anchor" href="#implementation"></a>Implementation</h3>
|
|
<div class="paragraph">
|
|
<p>It’s probably useful to do at least something besides printing out a string.
|
|
Let’s start by having a look at everything we get.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Modify your <code>cmd_psuh</code> implementation to dump the args you’re passed, keeping
|
|
existing <code>printf</code>() calls in place:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre> int i;
|
|
|
|
...
|
|
|
|
printf(Q_("Your args (there is %d):\n",
|
|
"Your args (there are %d):\n",
|
|
argc),
|
|
argc);
|
|
for (i = 0; i < argc; i++)
|
|
printf("%d: %s\n", i, argv[i]);
|
|
|
|
printf(_("Your current working directory:\n<top-level>%s%s\n"),
|
|
prefix ? "/" : "", prefix ? prefix : "");</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Build and try it. As you may expect, there’s pretty much just whatever we give
|
|
on the command line, including the name of our command. (If <code>prefix</code> is empty
|
|
for you, try <code>cd</code> <code>Documentation/</code> && <code>..</code><code>/bin-wrappers/git</code> <code>psuh</code>). That’s not so
|
|
helpful. So what other context can we get?</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Add a line to #include "config.<code>h</code>". Then, add the following bits to the
|
|
function body:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre> const char *cfg_name;
|
|
|
|
...
|
|
|
|
git_config(git_default_config, NULL);
|
|
if (git_config_get_string_tmp("user.name", &cfg_name) > 0)
|
|
printf(_("No name is found in config\n"));
|
|
else
|
|
printf(_("Your name: %s\n"), cfg_name);</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p><code>git_config</code>() will grab the configuration from config files known to Git and
|
|
apply standard precedence rules. <code>git_config_get_string_tmp</code>() will look up
|
|
a specific key ("user.name") and give you the value. There are a number of
|
|
single-key lookup functions like this one; you can see them all (and more info
|
|
about how to use <code>git_config</code>()) in <code>Documentation/technical/api-config.adoc</code>.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>You should see that the name printed matches the one you see when you run:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>$ git config --get user.name</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Great! Now we know how to check for values in the Git config. Let’s commit this
|
|
too, so we don’t lose our progress.</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>$ git add builtin/psuh.c
|
|
$ git commit -sm "psuh: show parameters & config opts"</pre>
|
|
</div>
|
|
</div>
|
|
<div class="admonitionblock note">
|
|
<table>
|
|
<tr>
|
|
<td class="icon">
|
|
<div class="title">Note</div>
|
|
</td>
|
|
<td class="content">
|
|
Again, the above is for sake of brevity in this tutorial. In a real change
|
|
you should not use <code>-m</code> but instead use the editor to write a meaningful
|
|
message.
|
|
</td>
|
|
</tr>
|
|
</table>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Still, it’d be nice to know what the user’s working context is like. Let’s see
|
|
if we can print the name of the user’s current branch. We can mimic the
|
|
<code>git</code> <code>status</code> implementation; the printer is located in <code>wt-status.c</code> and we can
|
|
see that the branch is held in a <code>struct</code> <code>wt_status</code>.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p><code>wt_status_print</code>() gets invoked by <code>cmd_status</code>() in <code>builtin/commit.c</code>.
|
|
Looking at that implementation we see the status config being populated like so:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>status_init_config(&s, git_status_config);</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>But as we drill down, we can find that <code>status_init_config</code>() wraps a call
|
|
to <code>git_config</code>(). Let’s modify the code we wrote in the previous commit.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Be sure to include the header to allow you to use <code>struct</code> <code>wt_status</code>:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>#include "wt-status.h"</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Then modify your <code>cmd_psuh</code> implementation to declare your <code>struct</code> <code>wt_status</code>,
|
|
prepare it, and print its contents:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre> struct wt_status status;
|
|
|
|
...
|
|
|
|
wt_status_prepare(the_repository, &status);
|
|
git_config(git_default_config, &status);
|
|
|
|
...
|
|
|
|
printf(_("Your current branch: %s\n"), status.branch);</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Run it again. Check it out - here’s the (verbose) name of your current branch!</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Let’s commit this as well.</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>$ git add builtin/psuh.c
|
|
$ git commit -sm "psuh: print the current branch"</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Now let’s see if we can get some info about a specific commit.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Luckily, there are some helpers for us here. <code>commit.h</code> has a function called
|
|
<code>lookup_commit_reference_by_name</code> to which we can simply provide a hardcoded
|
|
string; <code>pretty.h</code> has an extremely handy <code>pp_commit_easy</code>() call which doesn’t
|
|
require a full format object to be passed.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Add the following includes:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>#include "commit.h"
|
|
#include "pretty.h"</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Then, add the following lines within your implementation of <code>cmd_psuh</code>() near
|
|
the declarations and the logic, respectively.</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre> struct commit *c = NULL;
|
|
struct strbuf commitline = STRBUF_INIT;
|
|
|
|
...
|
|
|
|
c = lookup_commit_reference_by_name("origin/master");
|
|
|
|
if (c != NULL) {
|
|
pp_commit_easy(CMIT_FMT_ONELINE, c, &commitline);
|
|
printf(_("Current commit: %s\n"), commitline.buf);
|
|
}</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>The <code>struct</code> <code>strbuf</code> provides some safety belts to your basic <code>char</code>*, one of
|
|
which is a length member to prevent buffer overruns. It needs to be initialized
|
|
nicely with <code>STRBUF_INIT</code>. Keep it in mind when you need to pass around <code>char</code>*.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p><code>lookup_commit_reference_by_name</code> resolves the name you pass it, so you can play
|
|
with the value there and see what kind of things you can come up with.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p><code>pp_commit_easy</code> is a convenience wrapper in <code>pretty.h</code> that takes a single
|
|
format enum shorthand, rather than an entire format struct. It then
|
|
pretty-prints the commit according to that shorthand. These are similar to the
|
|
formats available with <code>--pretty=FOO</code> in many Git commands.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Build it and run, and if you’re using the same name in the example, you should
|
|
see the subject line of the most recent commit in <code>origin/master</code> that you know
|
|
about. Neat! Let’s commit that as well.</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>$ git add builtin/psuh.c
|
|
$ git commit -sm "psuh: display the top of origin/master"</pre>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="add-documentation"><a class="anchor" href="#add-documentation"></a>Adding Documentation</h3>
|
|
<div class="paragraph">
|
|
<p>Awesome! You’ve got a fantastic new command that you’re ready to share with the
|
|
community. But hang on just a minute - this isn’t very user-friendly. Run the
|
|
following:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>$ ./bin-wrappers/git help psuh</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Your new command is undocumented! Let’s fix that.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Take a look at <code>Documentation/git-</code>*.<code>adoc</code>. These are the manpages for the
|
|
subcommands that Git knows about. You can open these up and take a look to get
|
|
acquainted with the format, but then go ahead and make a new file
|
|
<code>Documentation/git-psuh.adoc</code>. Like with most of the documentation in the Git
|
|
project, help pages are written with AsciiDoc (see CodingGuidelines, "Writing
|
|
Documentation" section). Use the following template to fill out your own
|
|
manpage:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>git-psuh(1)
|
|
===========
|
|
|
|
NAME
|
|
----
|
|
git-psuh - Delight users' typo with a shy horse
|
|
|
|
|
|
SYNOPSIS
|
|
--------
|
|
[verse]
|
|
'git-psuh [<arg>...]'
|
|
|
|
DESCRIPTION
|
|
-----------
|
|
...
|
|
|
|
OPTIONS[[OPTIONS]]
|
|
------------------
|
|
...
|
|
|
|
OUTPUT
|
|
------
|
|
...
|
|
|
|
GIT
|
|
---
|
|
Part of the linkgit:git[1] suite</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>The most important pieces of this to note are the file header, underlined by =,
|
|
the NAME section, and the SYNOPSIS, which would normally contain the grammar if
|
|
your command took arguments. Try to use well-established manpage headers so your
|
|
documentation is consistent with other Git and UNIX manpages; this makes life
|
|
easier for your user, who can skip to the section they know contains the
|
|
information they need.</p>
|
|
</div>
|
|
<div class="admonitionblock note">
|
|
<table>
|
|
<tr>
|
|
<td class="icon">
|
|
<div class="title">Note</div>
|
|
</td>
|
|
<td class="content">
|
|
Before trying to build the docs, make sure you have the package <code>asciidoc</code>
|
|
installed.
|
|
</td>
|
|
</tr>
|
|
</table>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Now that you’ve written your manpage, you’ll need to build it explicitly. We
|
|
convert your AsciiDoc to troff which is man-readable like so:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>$ make all doc
|
|
$ man Documentation/git-psuh.1</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>or</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>$ make -C Documentation/ git-psuh.1
|
|
$ man Documentation/git-psuh.1</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>While this isn’t as satisfying as running through <code>git</code> <code>help</code>, you can at least
|
|
check that your help page looks right.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>You can also check that the documentation coverage is good (that is, the project
|
|
sees that your command has been implemented as well as documented) by running
|
|
<code>make</code> <code>check-docs</code> from the top-level.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Go ahead and commit your new documentation change.</p>
|
|
</div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="add-usage"><a class="anchor" href="#add-usage"></a>Adding Usage Text</h3>
|
|
<div class="paragraph">
|
|
<p>Try and run .<code>/bin-wrappers/git</code> <code>psuh</code> <code>-h</code>. Your command should crash at the end.
|
|
That’s because <code>-h</code> is a special case which your command should handle by
|
|
printing usage.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Take a look at <code>Documentation/technical/api-parse-options.adoc</code>. This is a handy
|
|
tool for pulling out options you need to be able to handle, and it takes a
|
|
usage string.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>In order to use it, we’ll need to prepare a NULL-terminated array of usage
|
|
strings and a <code>builtin_psuh_options</code> array.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Add a line to #include "parse-options.<code>h</code>".</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>At global scope, add your array of usage strings:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>static const char * const psuh_usage[] = {
|
|
N_("git psuh [<arg>...]"),
|
|
NULL,
|
|
};</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Then, within your <code>cmd_psuh</code>() implementation, we can declare and populate our
|
|
<code>option</code> struct. Ours is pretty boring but you can add more to it if you want to
|
|
explore <code>parse_options</code>() in more detail:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre> struct option options[] = {
|
|
OPT_END()
|
|
};</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Finally, before you print your args and prefix, add the call to
|
|
<code>parse-options</code>():</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre> argc = parse_options(argc, argv, prefix, options, psuh_usage, 0);</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>This call will modify your <code>argv</code> parameter. It will strip the options you
|
|
specified in <code>options</code> from <code>argv</code> and the locations pointed to from <code>options</code>
|
|
entries will be updated. Be sure to replace your <code>argc</code> with the result from
|
|
<code>parse_options</code>(), or you will be confused if you try to parse <code>argv</code> later.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>It’s worth noting the special argument <code>--</code>. As you may be aware, many Unix
|
|
commands use <code>--</code> to indicate "end of named parameters" - all parameters after
|
|
the <code>--</code> are interpreted merely as positional arguments. (This can be handy if
|
|
you want to pass as a parameter something which would usually be interpreted as
|
|
a flag.) <code>parse_options</code>() will terminate parsing when it reaches <code>--</code> and give
|
|
you the rest of the options afterwards, untouched.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Now that you have a usage hint, you can teach Git how to show it in the general
|
|
command list shown by <code>git</code> <code>help</code> <code>git</code> or <code>git</code> <code>help</code> <code>-a</code>, which is generated from
|
|
<code>command-list.txt</code>. Find the line for <em>git-pull</em> so you can add your <em>git-psuh</em>
|
|
line above it in alphabetical order. Now, we can add some attributes about the
|
|
command which impacts where it shows up in the aforementioned help commands. The
|
|
top of <code>command-list.txt</code> shares some information about what each attribute
|
|
means; in those help pages, the commands are sorted according to these
|
|
attributes. <code>git</code> <code>psuh</code> is user-facing, or porcelain - so we will mark it as
|
|
"mainporcelain". For "mainporcelain" commands, the comments at the top of
|
|
<code>command-list.txt</code> indicate we can also optionally add an attribute from another
|
|
list; since <code>git</code> <code>psuh</code> shows some information about the user’s workspace but
|
|
doesn’t modify anything, let’s mark it as "info". Make sure to keep your
|
|
attributes in the same style as the rest of <code>command-list.txt</code> using spaces to
|
|
align and delineate them:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>git-prune-packed plumbingmanipulators
|
|
git-psuh mainporcelain info
|
|
git-pull mainporcelain remote
|
|
git-push mainporcelain remote</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Build again. Now, when you run with <code>-h</code>, you should see your usage printed and
|
|
your command terminated before anything else interesting happens. Great!</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Go ahead and commit this one, too.</p>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="testing"><a class="anchor" href="#testing"></a>Testing</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph">
|
|
<p>It’s important to test your code - even for a little toy command like this one.
|
|
Moreover, your patch won’t be accepted into the Git tree without tests. Your
|
|
tests should:</p>
|
|
</div>
|
|
<div class="ulist">
|
|
<ul>
|
|
<li>
|
|
<p>Illustrate the current behavior of the feature</p>
|
|
</li>
|
|
<li>
|
|
<p>Prove the current behavior matches the expected behavior</p>
|
|
</li>
|
|
<li>
|
|
<p>Ensure the externally-visible behavior isn’t broken in later changes</p>
|
|
</li>
|
|
</ul>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>So let’s write some tests.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Related reading: <code>t/README</code></p>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="overview-test-structure"><a class="anchor" href="#overview-test-structure"></a>Overview of Testing Structure</h3>
|
|
<div class="paragraph">
|
|
<p>The tests in Git live in <code>t/</code> and are named with a 4-digit decimal number using
|
|
the schema shown in the Naming Tests section of <code>t/README</code>.</p>
|
|
</div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="write-new-test"><a class="anchor" href="#write-new-test"></a>Writing Your Test</h3>
|
|
<div class="paragraph">
|
|
<p>Since this a toy command, let’s go ahead and name the test with t9999. However,
|
|
as many of the family/subcmd combinations are full, best practice seems to be
|
|
to find a command close enough to the one you’ve added and share its naming
|
|
space.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Create a new file <code>t/t9999-psuh-tutorial.sh</code>. Begin with the header as so (see
|
|
"Writing Tests" and "Source <em>test-lib.sh</em>" in <code>t/README</code>):</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>#!/bin/sh
|
|
|
|
test_description='git-psuh test
|
|
|
|
This test runs git-psuh and makes sure it does not crash.'
|
|
|
|
. ./test-lib.sh</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Tests are framed inside of a <code>test_expect_success</code> in order to output TAP
|
|
formatted results. Let’s make sure that <code>git</code> <code>psuh</code> doesn’t exit poorly and does
|
|
mention the right animal somewhere:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>test_expect_success 'runs correctly with no args and good output' '
|
|
git psuh >actual &&
|
|
grep Pony actual
|
|
'</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Indicate that you’ve run everything you wanted by adding the following at the
|
|
bottom of your script:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>test_done</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Make sure you mark your test script executable:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>$ chmod +x t/t9999-psuh-tutorial.sh</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>You can get an idea of whether you created your new test script successfully
|
|
by running <code>make</code> <code>-C</code> <code>t</code> <code>test-lint</code>, which will check for things like test number
|
|
uniqueness, executable bit, and so on.</p>
|
|
</div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="local-test"><a class="anchor" href="#local-test"></a>Running Locally</h3>
|
|
<div class="paragraph">
|
|
<p>Let’s try and run locally:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>$ make
|
|
$ cd t/ && prove t9999-psuh-tutorial.sh</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>You can run the full test suite and ensure <code>git-psuh</code> didn’t break anything:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>$ cd t/
|
|
$ prove -j$(nproc) --shuffle t[0-9]*.sh</pre>
|
|
</div>
|
|
</div>
|
|
<div class="admonitionblock note">
|
|
<table>
|
|
<tr>
|
|
<td class="icon">
|
|
<div class="title">Note</div>
|
|
</td>
|
|
<td class="content">
|
|
You can also do this with <code>make</code> <code>test</code> or use any testing harness which can
|
|
speak TAP. <code>prove</code> can run concurrently. <code>shuffle</code> randomizes the order the
|
|
tests are run in, which makes them resilient against unwanted inter-test
|
|
dependencies. <code>prove</code> also makes the output nicer.
|
|
</td>
|
|
</tr>
|
|
</table>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Go ahead and commit this change, as well.</p>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="ready-to-share"><a class="anchor" href="#ready-to-share"></a>Getting Ready to Share: Anatomy of a Patch Series</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph">
|
|
<p>You may have noticed already that the Git project performs its code reviews via
|
|
emailed patches, which are then applied by the maintainer when they are ready
|
|
and approved by the community. The Git project does not accept contributions from
|
|
pull requests, and the patches emailed for review need to be formatted a
|
|
specific way.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Before taking a look at how to convert your commits into emailed patches,
|
|
let’s analyze what the end result, a "patch series", looks like. Here is an
|
|
<a href="https://lore.kernel.org/git/pull.1218.git.git.1645209647.gitgitgadget@gmail.com/">example</a> of the summary view for a patch series on the web interface of
|
|
the <a href="https://lore.kernel.org/git/">Git mailing list archive</a>:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>2022-02-18 18:40 [PATCH 0/3] libify reflog John Cai via GitGitGadget
|
|
2022-02-18 18:40 ` [PATCH 1/3] reflog: libify delete reflog function and helpers John Cai via GitGitGadget
|
|
2022-02-18 19:10 ` Ævar Arnfjörð Bjarmason [this message]
|
|
2022-02-18 19:39 ` Taylor Blau
|
|
2022-02-18 19:48 ` Ævar Arnfjörð Bjarmason
|
|
2022-02-18 19:35 ` Taylor Blau
|
|
2022-02-21 1:43 ` John Cai
|
|
2022-02-21 1:50 ` Taylor Blau
|
|
2022-02-23 19:50 ` John Cai
|
|
2022-02-18 20:00 ` // other replies elided
|
|
2022-02-18 18:40 ` [PATCH 2/3] reflog: call reflog_delete from reflog.c John Cai via GitGitGadget
|
|
2022-02-18 19:15 ` Ævar Arnfjörð Bjarmason
|
|
2022-02-18 20:26 ` Junio C Hamano
|
|
2022-02-18 18:40 ` [PATCH 3/3] stash: call reflog_delete from reflog.c John Cai via GitGitGadget
|
|
2022-02-18 19:20 ` Ævar Arnfjörð Bjarmason
|
|
2022-02-19 0:21 ` Taylor Blau
|
|
2022-02-22 2:36 ` John Cai
|
|
2022-02-22 10:51 ` Ævar Arnfjörð Bjarmason
|
|
2022-02-18 19:29 ` [PATCH 0/3] libify reflog Ævar Arnfjörð Bjarmason
|
|
2022-02-22 18:30 ` [PATCH v2 0/3] libify reflog John Cai via GitGitGadget
|
|
2022-02-22 18:30 ` [PATCH v2 1/3] stash: add test to ensure reflog --rewrite --updatref behavior John Cai via GitGitGadget
|
|
2022-02-23 8:54 ` Ævar Arnfjörð Bjarmason
|
|
2022-02-23 21:27 ` Junio C Hamano
|
|
// continued</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>We can note a few things:</p>
|
|
</div>
|
|
<div class="ulist">
|
|
<ul>
|
|
<li>
|
|
<p>Each commit is sent as a separate email, with the commit message title as
|
|
subject, prefixed with "[PATCH <em>i</em>/<em>n</em>]" for the <em>i</em>-th commit of an
|
|
<em>n</em>-commit series.</p>
|
|
</li>
|
|
<li>
|
|
<p>Each patch is sent as a reply to an introductory email called the <em>cover
|
|
letter</em> of the series, prefixed "[PATCH 0/<em>n</em>]".</p>
|
|
</li>
|
|
<li>
|
|
<p>Subsequent iterations of the patch series are labelled "PATCH v2", "PATCH
|
|
v3", etc. in place of "PATCH". For example, "[PATCH v2 1/3]" would be the first of
|
|
three patches in the second iteration. Each iteration is sent with a new cover
|
|
letter (like "[PATCH v2 0/3]" above), itself a reply to the cover letter of the
|
|
previous iteration (more on that below).</p>
|
|
</li>
|
|
</ul>
|
|
</div>
|
|
<div class="admonitionblock note">
|
|
<table>
|
|
<tr>
|
|
<td class="icon">
|
|
<div class="title">Note</div>
|
|
</td>
|
|
<td class="content">
|
|
A single-patch topic is sent with "[PATCH]", "[PATCH v2]", etc. without
|
|
<em>i</em>/<em>n</em> numbering (in the above thread overview, no single-patch topic appears,
|
|
though).
|
|
</td>
|
|
</tr>
|
|
</table>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="cover-letter"><a class="anchor" href="#cover-letter"></a>The cover letter</h3>
|
|
<div class="paragraph">
|
|
<p>In addition to an email per patch, the Git community also expects your patches
|
|
to come with a cover letter. This is an important component of change
|
|
submission as it explains to the community from a high level what you’re trying
|
|
to do, and why, in a way that’s more apparent than just looking at your
|
|
patches.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>The title of your cover letter should be something which succinctly covers the
|
|
purpose of your entire topic branch. It’s often in the imperative mood, just
|
|
like our commit message titles. Here is how we’ll title our series:</p>
|
|
</div>
|
|
<hr/>
|
|
<div class="paragraph">
|
|
<p>Add the <em>psuh</em> command
|
|
---</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>The body of the cover letter is used to give additional context to reviewers.
|
|
Be sure to explain anything your patches don’t make clear on their own, but
|
|
remember that since the cover letter is not recorded in the commit history,
|
|
anything that might be useful to future readers of the repository’s history
|
|
should also be in your commit messages.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Here’s an example body for <code>psuh</code>:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>Our internal metrics indicate widespread interest in the command
|
|
git-psuh - that is, many users are trying to use it, but finding it is
|
|
unavailable, using some unknown workaround instead.
|
|
|
|
The following handful of patches add the psuh command and implement some
|
|
handy features on top of it.
|
|
|
|
This patchset is part of the MyFirstContribution tutorial and should not
|
|
be merged.</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>At this point the tutorial diverges, in order to demonstrate two
|
|
different methods of formatting your patchset and getting it reviewed.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>The first method to be covered is GitGitGadget, which is useful for those
|
|
already familiar with GitHub’s common pull request workflow. This method
|
|
requires a GitHub account.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>The second method to be covered is <code>git</code> <code>send-email</code>, which can give slightly
|
|
more fine-grained control over the emails to be sent. This method requires some
|
|
setup which can change depending on your system and will not be covered in this
|
|
tutorial.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Regardless of which method you choose, your engagement with reviewers will be
|
|
the same; the review process will be covered after the sections on GitGitGadget
|
|
and <code>git</code> <code>send-email</code>.</p>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="howto-ggg"><a class="anchor" href="#howto-ggg"></a>Sending Patches via GitGitGadget</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph">
|
|
<p>One option for sending patches is to follow a typical pull request workflow and
|
|
send your patches out via GitGitGadget. GitGitGadget is a tool created by
|
|
Johannes Schindelin to make life as a Git contributor easier for those used to
|
|
the GitHub PR workflow. It allows contributors to open pull requests against its
|
|
mirror of the Git project, and does some magic to turn the PR into a set of
|
|
emails and send them out for you. It also runs the Git continuous integration
|
|
suite for you. It’s documented at <a href="https://gitgitgadget.github.io/" class="bare">https://gitgitgadget.github.io/</a>.</p>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="create-fork"><a class="anchor" href="#create-fork"></a>Forking <code>git/git</code> on GitHub</h3>
|
|
<div class="paragraph">
|
|
<p>Before you can send your patch off to be reviewed using GitGitGadget, you will
|
|
need to fork the Git project and upload your changes. First thing - make sure
|
|
you have a GitHub account.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Head to the <a href="https://github.com/git/git">GitHub mirror</a> and look for the Fork
|
|
button. Place your fork wherever you deem appropriate and create it.</p>
|
|
</div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="upload-to-fork"><a class="anchor" href="#upload-to-fork"></a>Uploading to Your Own Fork</h3>
|
|
<div class="paragraph">
|
|
<p>To upload your branch to your own fork, you’ll need to add the new fork as a
|
|
remote. You can use <code>git</code> <code>remote</code> <code>-v</code> to show the remotes you have added already.
|
|
From your new fork’s page on GitHub, you can press "Clone or download" to get
|
|
the URL; then you need to run the following to add, replacing your own URL and
|
|
remote name for the examples provided:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>$ git remote add remotename git@github.com:remotename/git.git</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>or to use the HTTPS URL:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>$ git remote add remotename https://github.com/remotename/git/.git</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Run <code>git</code> <code>remote</code> <code>-v</code> again and you should see the new remote showing up.
|
|
<code>git</code> <code>fetch</code> <code>remotename</code> (with the real name of your remote replaced) in order to
|
|
get ready to push.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Next, double-check that you’ve been doing all your development in a new branch
|
|
by running <code>git</code> <code>branch</code>. If you didn’t, now is a good time to move your new
|
|
commits to their own branch.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>As mentioned briefly at the beginning of this document, we are basing our work
|
|
on <code>master</code>, so go ahead and update as shown below, or using your preferred
|
|
workflow.</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>$ git checkout master
|
|
$ git pull -r
|
|
$ git rebase master psuh</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Finally, you’re ready to push your new topic branch! (Due to our branch and
|
|
command name choices, be careful when you type the command below.)</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>$ git push remotename psuh</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Now you should be able to go and check out your newly created branch on GitHub.</p>
|
|
</div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="send-pr-ggg"><a class="anchor" href="#send-pr-ggg"></a>Sending a PR to GitGitGadget</h3>
|
|
<div class="paragraph">
|
|
<p>In order to have your code tested and formatted for review, you need to start by
|
|
opening a Pull Request against <code>gitgitgadget/git</code>. Head to
|
|
<a href="https://github.com/gitgitgadget/git" class="bare">https://github.com/gitgitgadget/git</a> and open a PR either with the "New pull
|
|
request" button or the convenient "Compare & pull request" button that may
|
|
appear with the name of your newly pushed branch.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Review the PR’s title and description, as they’re used by GitGitGadget
|
|
respectively as the subject and body of the cover letter for your change. Refer
|
|
to <a href="#cover-letter">"The cover letter"</a> above for advice on how to title your
|
|
submission and what content to include in the description.</p>
|
|
</div>
|
|
<div class="admonitionblock note">
|
|
<table>
|
|
<tr>
|
|
<td class="icon">
|
|
<div class="title">Note</div>
|
|
</td>
|
|
<td class="content">
|
|
For single-patch contributions, your commit message should already be
|
|
meaningful and explain at a high level the purpose (what is happening and why)
|
|
of your patch, so you usually do not need any additional context. In that case,
|
|
remove the PR description that GitHub automatically generates from your commit
|
|
message (your PR description should be empty). If you do need to supply even
|
|
more context, you can do so in that space and it will be appended to the email
|
|
that GitGitGadget will send, between the three-dash line and the diffstat
|
|
(see <a href="#single-patch">Bonus Chapter: One-Patch Changes</a> for how this looks once
|
|
submitted).
|
|
</td>
|
|
</tr>
|
|
</table>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>When you’re happy, submit your pull request.</p>
|
|
</div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="run-ci-ggg"><a class="anchor" href="#run-ci-ggg"></a>Running CI and Getting Ready to Send</h3>
|
|
<div class="paragraph">
|
|
<p>If it’s your first time using GitGitGadget (which is likely, as you’re using
|
|
this tutorial) then someone will need to give you permission to use the tool.
|
|
As mentioned in the GitGitGadget documentation, you just need someone who
|
|
already uses it to comment on your PR with <code>/allow</code> <em><username></em>. GitGitGadget
|
|
will automatically run your PRs through the CI even without the permission given
|
|
but you will not be able to <code>/submit</code> your changes until someone allows you to
|
|
use the tool.</p>
|
|
</div>
|
|
<div class="admonitionblock note">
|
|
<table>
|
|
<tr>
|
|
<td class="icon">
|
|
<div class="title">Note</div>
|
|
</td>
|
|
<td class="content">
|
|
You can typically find someone who can <code>/allow</code> you on GitGitGadget by
|
|
either examining recent pull requests where someone has been granted <code>/allow</code>
|
|
(<a href="https://github.com/gitgitgadget/git/pulls?utf8=%E2%9C%93&q=is%3Apr+is%3Aopen+%22%2Fallow%22">Search:
|
|
is:pr is:open "/allow"</a>), in which case both the author and the person who
|
|
granted the <code>/allow</code> can now <code>/allow</code> you, or by inquiring on the
|
|
<a href="https://web.libera.chat/#git-devel">#git-devel</a> IRC channel on Libera Chat
|
|
linking your pull request and asking for someone to <code>/allow</code> you.
|
|
</td>
|
|
</tr>
|
|
</table>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>If the CI fails, you can update your changes with <code>git</code> <code>rebase</code> <code>-i</code> and push your
|
|
branch again:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>$ git push -f remotename psuh</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>In fact, you should continue to make changes this way up until the point when
|
|
your patch is accepted into <code>next</code>.</p>
|
|
</div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="send-mail-ggg"><a class="anchor" href="#send-mail-ggg"></a>Sending Your Patches</h3>
|
|
<div class="paragraph">
|
|
<p>Now that your CI is passing and someone has granted you permission to use
|
|
GitGitGadget with the <code>/allow</code> command, sending out for review is as simple as
|
|
commenting on your PR with <code>/submit</code>.</p>
|
|
</div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="responding-ggg"><a class="anchor" href="#responding-ggg"></a>Updating With Comments</h3>
|
|
<div class="paragraph">
|
|
<p>Skip ahead to <a href="#reviewing">Responding to Reviews</a> for information on how to
|
|
reply to review comments you will receive on the mailing list.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Once you have your branch again in the shape you want following all review
|
|
comments, you can submit again:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>$ git push -f remotename psuh</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Next, go look at your pull request against GitGitGadget; you should see the CI
|
|
has been kicked off again. Now while the CI is running is a good time for you
|
|
to modify your description at the top of the pull request thread; it will be
|
|
used again as the cover letter. You should use this space to describe what
|
|
has changed since your previous version, so that your reviewers have some idea
|
|
of what they’re looking at. When the CI is done running, you can comment once
|
|
more with <code>/submit</code> - GitGitGadget will automatically add a v2 mark to your
|
|
changes.</p>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="howto-git-send-email"><a class="anchor" href="#howto-git-send-email"></a>Sending Patches with <code>git</code> <code>send-email</code></h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph">
|
|
<p>If you don’t want to use GitGitGadget, you can also use Git itself to mail your
|
|
patches. Some benefits of using Git this way include finer grained control of
|
|
subject line (for example, being able to use the tag [RFC PATCH] in the subject)
|
|
and being able to send a “dry run” mail to yourself to ensure it all looks
|
|
good before going out to the list.</p>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="setup-git-send-email"><a class="anchor" href="#setup-git-send-email"></a>Prerequisite: Setting Up <code>git</code> <code>send-email</code></h3>
|
|
<div class="paragraph">
|
|
<p>Configuration for <code>send-email</code> can vary based on your operating system and email
|
|
provider, and so will not be covered in this tutorial, beyond stating that in
|
|
many distributions of Linux, <code>git-send-email</code> is not packaged alongside the
|
|
typical <code>git</code> install. You may need to install this additional package; there
|
|
are a number of resources online to help you do so. You will also need to
|
|
determine the right way to configure it to use your SMTP server; again, as this
|
|
configuration can change significantly based on your system and email setup, it
|
|
is out of scope for the context of this tutorial.</p>
|
|
</div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="format-patch"><a class="anchor" href="#format-patch"></a>Preparing Initial Patchset</h3>
|
|
<div class="paragraph">
|
|
<p>Sending emails with Git is a two-part process; before you can prepare the emails
|
|
themselves, you’ll need to prepare the patches. Luckily, this is pretty simple:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>$ git format-patch --cover-letter -o psuh/ --base=auto psuh@{u}..psuh</pre>
|
|
</div>
|
|
</div>
|
|
<div class="olist arabic">
|
|
<ol class="arabic">
|
|
<li>
|
|
<p>The <code>--cover-letter</code> option tells <code>format-patch</code> to create a
|
|
cover letter template for you. You will need to fill in the
|
|
template before you’re ready to send - but for now, the template
|
|
will be next to your other patches.</p>
|
|
</li>
|
|
<li>
|
|
<p>The <code>-o</code> <code>psuh/</code> option tells <code>format-patch</code> to place the patch
|
|
files into a directory. This is useful because <code>git</code> <code>send-email</code>
|
|
can take a directory and send out all the patches from there.</p>
|
|
</li>
|
|
<li>
|
|
<p>The <code>--base=auto</code> option tells the command to record the "base
|
|
commit", on which the recipient is expected to apply the patch
|
|
series. The <code>auto</code> value will cause <code>format-patch</code> to compute
|
|
the base commit automatically, which is the merge base of tip
|
|
commit of the remote-tracking branch and the specified revision
|
|
range.</p>
|
|
</li>
|
|
<li>
|
|
<p>The <code>psuh@</code>{u}<code>..</code><code>psuh</code> option tells <code>format-patch</code> to generate
|
|
patches for the commits you created on the <code>psuh</code> branch since it
|
|
forked from its upstream (which is <code>origin/master</code> if you
|
|
followed the example in the "Set up your workspace" section). If
|
|
you are already on the <code>psuh</code> branch, you can just say <code>@</code>{u},
|
|
which means "commits on the current branch since it forked from
|
|
its upstream", which is the same thing.</p>
|
|
</li>
|
|
</ol>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>The command will make one patch file per commit. After you
|
|
run, you can go have a look at each of the patches with your favorite text
|
|
editor and make sure everything looks alright; however, it’s not recommended to
|
|
make code fixups via the patch file. It’s a better idea to make the change the
|
|
normal way using <code>git</code> <code>rebase</code> <code>-i</code> or by adding a new commit than by modifying a
|
|
patch.</p>
|
|
</div>
|
|
<div class="admonitionblock note">
|
|
<table>
|
|
<tr>
|
|
<td class="icon">
|
|
<div class="title">Note</div>
|
|
</td>
|
|
<td class="content">
|
|
Optionally, you can also use the <code>--rfc</code> flag to prefix your patch subject
|
|
with “[RFC PATCH]” instead of “[PATCH]”. RFC stands for “request for
|
|
comments” and indicates that while your code isn’t quite ready for submission,
|
|
you’d like to begin the code review process. This can also be used when your
|
|
patch is a proposal, but you aren’t sure whether the community wants to solve
|
|
the problem with that approach or not - to conduct a sort of design review. You
|
|
may also see on the list patches marked “WIP” - this means they are incomplete
|
|
but want reviewers to look at what they have so far. You can add this flag with
|
|
<code>--subject-prefix=WIP</code>.
|
|
</td>
|
|
</tr>
|
|
</table>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Check and make sure that your patches and cover letter template exist in the
|
|
directory you specified - you’re nearly ready to send out your review!</p>
|
|
</div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="preparing-cover-letter"><a class="anchor" href="#preparing-cover-letter"></a>Preparing Email</h3>
|
|
<div class="paragraph">
|
|
<p>Since you invoked <code>format-patch</code> with <code>--cover-letter</code>, you’ve already got a
|
|
cover letter template ready. Open it up in your favorite editor.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>You should see a number of headers present already. Check that your <code>From:</code>
|
|
header is correct. Then modify your <code>Subject:</code> (see <a href="#cover-letter">above</a> for
|
|
how to choose good title for your patch series):</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>Subject: [PATCH 0/7] Add the 'psuh' command</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Make sure you retain the “[PATCH 0/X]” part; that’s what indicates to the Git
|
|
community that this email is the beginning of a patch series, and many
|
|
reviewers filter their email for this type of flag.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>You’ll need to add some extra parameters when you invoke <code>git</code> <code>send-email</code> to add
|
|
the cover letter.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Next you’ll have to fill out the body of your cover letter. Again, see
|
|
<a href="#cover-letter">above</a> for what content to include.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>The template created by <code>git</code> <code>format-patch</code> <code>--cover-letter</code> includes a diffstat.
|
|
This gives reviewers a summary of what they’re in for when reviewing your topic.
|
|
The one generated for <code>psuh</code> from the sample implementation looks like this:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre> Documentation/git-psuh.adoc | 40 +++++++++++++++++++++
|
|
Makefile | 1 +
|
|
builtin.h | 1 +
|
|
builtin/psuh.c | 73 ++++++++++++++++++++++++++++++++++++++
|
|
git.c | 1 +
|
|
t/t9999-psuh-tutorial.sh | 12 +++++++
|
|
6 files changed, 128 insertions(+)
|
|
create mode 100644 Documentation/git-psuh.adoc
|
|
create mode 100644 builtin/psuh.c
|
|
create mode 100755 t/t9999-psuh-tutorial.sh</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Finally, the letter will include the version of Git used to generate the
|
|
patches. You can leave that string alone.</p>
|
|
</div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="sending-git-send-email"><a class="anchor" href="#sending-git-send-email"></a>Sending Email</h3>
|
|
<div class="paragraph">
|
|
<p>At this point you should have a directory <code>psuh/</code> which is filled with your
|
|
patches and a cover letter. Time to mail it out! You can send it like this:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>$ git send-email --to=target@example.com psuh/*.patch</pre>
|
|
</div>
|
|
</div>
|
|
<div class="admonitionblock note">
|
|
<table>
|
|
<tr>
|
|
<td class="icon">
|
|
<div class="title">Note</div>
|
|
</td>
|
|
<td class="content">
|
|
Check <code>git</code> <code>help</code> <code>send-email</code> for some other options which you may find
|
|
valuable, such as changing the Reply-to address or adding more CC and BCC lines.
|
|
</td>
|
|
</tr>
|
|
</table>
|
|
</div>
|
|
<div class="admonitionblock note">
|
|
<table>
|
|
<tr>
|
|
<td class="icon">
|
|
<div class="title">Note</div>
|
|
</td>
|
|
<td class="content">
|
|
If you’re not sure whom to CC, running <code>contrib/contacts/git-contacts</code> can
|
|
list potential reviewers. In addition, you can do <code>git</code> <code>send-email</code>
|
|
<code>--cc-cmd=</code>'perl <code>contrib/contacts/git-contacts</code>' <code>feature/</code>*.<code>patch</code><sup class="footnote" id="_footnote_contrib-scripts">[<a id="_footnoteref_1" class="footnote" href="#_footnotedef_1" title="View footnote.">1</a>]</sup> to
|
|
automatically pass this list of emails to <code>send-email</code>.
|
|
</td>
|
|
</tr>
|
|
</table>
|
|
</div>
|
|
<div class="admonitionblock note">
|
|
<table>
|
|
<tr>
|
|
<td class="icon">
|
|
<div class="title">Note</div>
|
|
</td>
|
|
<td class="content">
|
|
When you are sending a real patch, it will go to <a href="mailto:git@vger.kernel.org">git@vger.kernel.org</a> - but
|
|
please don’t send your patchset from the tutorial to the real mailing list! For
|
|
now, you can send it to yourself, to make sure you understand how it will look.
|
|
</td>
|
|
</tr>
|
|
</table>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>After you run the command above, you will be presented with an interactive
|
|
prompt for each patch that’s about to go out. This gives you one last chance to
|
|
edit or quit sending something (but again, don’t edit code this way). Once you
|
|
press <code>y</code> or <code>a</code> at these prompts your emails will be sent! Congratulations!</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Awesome, now the community will drop everything and review your changes. (Just
|
|
kidding - be patient!)</p>
|
|
</div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="v2-git-send-email"><a class="anchor" href="#v2-git-send-email"></a>Sending v2</h3>
|
|
<div class="paragraph">
|
|
<p>This section will focus on how to send a v2 of your patchset. To learn what
|
|
should go into v2, skip ahead to <a href="#reviewing">Responding to Reviews</a> for
|
|
information on how to handle comments from reviewers.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>We’ll reuse our <code>psuh</code> topic branch for v2. Before we make any changes, we’ll
|
|
mark the tip of our v1 branch for easy reference:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>$ git checkout psuh
|
|
$ git branch psuh-v1</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Refine your patch series by using <code>git</code> <code>rebase</code> <code>-i</code> to adjust commits based upon
|
|
reviewer comments. Once the patch series is ready for submission, generate your
|
|
patches again, but with some new flags:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>$ git format-patch -v2 --cover-letter -o psuh/ --range-diff master..psuh-v1 master..</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>The <code>--range-diff</code> <code>master</code><code>..</code><code>psuh-v1</code> parameter tells <code>format-patch</code> to include a
|
|
range-diff between <code>psuh-v1</code> and <code>psuh</code> in the cover letter (see
|
|
<a href="git-range-diff.html">git-range-diff(1)</a>). This helps tell reviewers about the differences
|
|
between your v1 and v2 patches.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>The <code>-v2</code> parameter tells <code>format-patch</code> to output your patches
|
|
as version "2". For instance, you may notice that your v2 patches are
|
|
all named like <code>v2-000n-my-commit-subject.patch</code>. <code>-v2</code> will also format
|
|
your patches by prefixing them with "[PATCH v2]" instead of "[PATCH]",
|
|
and your range-diff will be prefaced with "Range-diff against v1".</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>After you run this command, <code>format-patch</code> will output the patches to the <code>psuh/</code>
|
|
directory, alongside the v1 patches. Using a single directory makes it easy to
|
|
refer to the old v1 patches while proofreading the v2 patches, but you will need
|
|
to be careful to send out only the v2 patches. We will use a pattern like
|
|
<code>psuh/v2-</code>*.<code>patch</code> (not <code>psuh/</code>*.<code>patch</code>, which would match v1 and v2 patches).</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Edit your cover letter again. Now is a good time to mention what’s different
|
|
between your last version and now, if it’s something significant. You do not
|
|
need the exact same body in your second cover letter; focus on explaining to
|
|
reviewers the changes you’ve made that may not be as visible.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>You will also need to go and find the Message-ID of your previous cover letter.
|
|
You can either note it when you send the first series, from the output of <code>git</code>
|
|
<code>send-email</code>, or you can look it up on the
|
|
<a href="https://lore.kernel.org/git">mailing list</a>. Find your cover letter in the
|
|
archives, click on it, then click "permalink" or "raw" to reveal the Message-ID
|
|
header. It should match:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>Message-ID: <foo.12345.author@example.com></pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Your Message-ID is <foo.<code>12345.author@example.com</code>>. This example will be used
|
|
below as well; make sure to replace it with the correct Message-ID for your
|
|
<strong>previous cover letter</strong> - that is, if you’re sending v2, use the Message-ID
|
|
from v1; if you’re sending v3, use the Message-ID from v2.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>While you’re looking at the email, you should also note who is CC’d, as it’s
|
|
common practice in the mailing list to keep all CCs on a thread. You can add
|
|
these CC lines directly to your cover letter with a line like so in the header
|
|
(before the Subject line):</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>CC: author@example.com, Othe R <other@example.com></pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Now send the emails again, paying close attention to which messages you pass in
|
|
to the command:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>$ git send-email --to=target@example.com
|
|
--in-reply-to="<foo.12345.author@example.com>"
|
|
psuh/v2-*.patch</pre>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="single-patch"><a class="anchor" href="#single-patch"></a>Bonus Chapter: One-Patch Changes</h3>
|
|
<div class="paragraph">
|
|
<p>In some cases, your very small change may consist of only one patch. When that
|
|
happens, you only need to send one email. Your commit message should already be
|
|
meaningful and explain at a high level the purpose (what is happening and why)
|
|
of your patch, but if you need to supply even more context, you can do so below
|
|
the <code>---</code> in your patch. Take the example below, which was generated with <code>git</code>
|
|
<code>format-patch</code> on a single commit, and then edited to add the content between
|
|
the <code>---</code> and the diffstat.</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>From 1345bbb3f7ac74abde040c12e737204689a72723 Mon Sep 17 00:00:00 2001
|
|
From: A U Thor <author@example.com>
|
|
Date: Thu, 18 Apr 2019 15:11:02 -0700
|
|
Subject: [PATCH] README: change the grammar
|
|
|
|
I think it looks better this way. This part of the commit message will
|
|
end up in the commit-log.
|
|
|
|
Signed-off-by: A U Thor <author@example.com>
|
|
---
|
|
Let's have a wild discussion about grammar on the mailing list. This
|
|
part of my email will never end up in the commit log. Here is where I
|
|
can add additional context to the mailing list about my intent, outside
|
|
of the context of the commit log. This section was added after `git
|
|
format-patch` was run, by editing the patch file in a text editor.
|
|
|
|
README.md | 2 +-
|
|
1 file changed, 1 insertion(+), 1 deletion(-)
|
|
|
|
diff --git a/README.md b/README.md
|
|
index 88f126184c..38da593a60 100644
|
|
--- a/README.md
|
|
+++ b/README.md
|
|
@@ -3,7 +3,7 @@
|
|
Git - fast, scalable, distributed revision control system
|
|
=========================================================
|
|
|
|
-Git is a fast, scalable, distributed revision control system with an
|
|
+Git is a fast, scalable, and distributed revision control system with an
|
|
unusually rich command set that provides both high-level operations
|
|
and full access to internals.
|
|
|
|
--
|
|
2.21.0.392.gf8f6787159e-goog</pre>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="now-what"><a class="anchor" href="#now-what"></a>My Patch Got Emailed - Now What?</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph">
|
|
<p>Please give reviewers enough time to process your initial patch before
|
|
sending an updated version. That is, resist the temptation to send a new
|
|
version immediately, because others may have already started reviewing
|
|
your initial version.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>While waiting for review comments, you may find mistakes in your initial
|
|
patch, or perhaps realize a different and better way to achieve the goal
|
|
of the patch. In this case you may communicate your findings to other
|
|
reviewers as follows:</p>
|
|
</div>
|
|
<div class="ulist">
|
|
<ul>
|
|
<li>
|
|
<p>If the mistakes you found are minor, send a reply to your patch as if
|
|
you were a reviewer and mention that you will fix them in an
|
|
updated version.</p>
|
|
</li>
|
|
<li>
|
|
<p>On the other hand, if you think you want to change the course so
|
|
drastically that reviews on the initial patch would be a waste of
|
|
time (for everyone involved), retract the patch immediately with
|
|
a reply like "I am working on a much better approach, so please
|
|
ignore this patch and wait for the updated version."</p>
|
|
</li>
|
|
</ul>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Now, the above is a good practice if you sent your initial patch
|
|
prematurely without polish. But a better approach of course is to avoid
|
|
sending your patch prematurely in the first place.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Please be considerate of the time needed by reviewers to examine each
|
|
new version of your patch. Rather than seeing the initial version right
|
|
now (followed by several "oops, I like this version better than the
|
|
previous one" patches over 2 days), reviewers would strongly prefer if a
|
|
single polished version came 2 days later instead, and that version with
|
|
fewer mistakes were the only one they would need to review.</p>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="reviewing"><a class="anchor" href="#reviewing"></a>Responding to Reviews</h3>
|
|
<div class="paragraph">
|
|
<p>After a few days, you will hopefully receive a reply to your patchset with some
|
|
comments. Woohoo! Now you can get back to work.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>It’s good manners to reply to each comment, notifying the reviewer that you have
|
|
made the change suggested, feel the original is better, or that the comment
|
|
inspired you to do something a new way which is superior to both the original
|
|
and the suggested change. This way reviewers don’t need to inspect your v2 to
|
|
figure out whether you implemented their comment or not.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Reviewers may ask you about what you wrote in the patchset, either in
|
|
the proposed commit log message or in the changes themselves. You
|
|
should answer these questions in your response messages, but often the
|
|
reason why reviewers asked these questions to understand what you meant
|
|
to write is because your patchset needed clarification to be understood.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Do not be satisfied by just answering their questions in your response
|
|
and hear them say that they now understand what you wanted to say.
|
|
Update your patches to clarify the points reviewers had trouble with,
|
|
and prepare your v2; the words you used to explain your v1 to answer
|
|
reviewers' questions may be useful thing to use. Your goal is to make
|
|
your v2 clear enough so that it becomes unnecessary for you to give the
|
|
same explanation to the next person who reads it.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>If you are going to push back on a comment, be polite and explain why you feel
|
|
your original is better; be prepared that the reviewer may still disagree with
|
|
you, and the rest of the community may weigh in on one side or the other. As
|
|
with all code reviews, it’s important to keep an open mind to doing something a
|
|
different way than you originally planned; other reviewers have a different
|
|
perspective on the project than you do, and may be thinking of a valid side
|
|
effect which had not occurred to you. It is always okay to ask for clarification
|
|
if you aren’t sure why a change was suggested, or what the reviewer is asking
|
|
you to do.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Make sure your email client has a plaintext email mode and it is turned on; the
|
|
Git list rejects HTML email. Please also follow the mailing list etiquette
|
|
outlined in the
|
|
<a href="https://kernel.googlesource.com/pub/scm/git/git/+/todo/MaintNotes">Maintainer’s
|
|
Note</a>, which are similar to etiquette rules in most open source communities
|
|
surrounding bottom-posting and inline replies.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>When you’re making changes to your code, it is cleanest - that is, the resulting
|
|
commits are easiest to look at - if you use <code>git</code> <code>rebase</code> <code>-i</code> (interactive
|
|
rebase). Take a look at this
|
|
<a href="https://www.oreilly.com/library/view/git-pocket-guide/9781449327507/ch10.html">overview</a>
|
|
from O’Reilly. The general idea is to modify each commit which requires changes;
|
|
this way, instead of having a patch A with a mistake, a patch B which was fine
|
|
and required no upstream reviews in v1, and a patch C which fixes patch A for
|
|
v2, you can just ship a v2 with a correct patch A and correct patch B. This is
|
|
changing history, but since it’s local history which you haven’t shared with
|
|
anyone, that is okay for now! (Later, it may not make sense to do this; take a
|
|
look at the section below this one for some context.)</p>
|
|
</div>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="after-approval"><a class="anchor" href="#after-approval"></a>After Review Approval</h3>
|
|
<div class="paragraph">
|
|
<p>The Git project has four integration branches: <code>seen</code>, <code>next</code>, <code>master</code>, and
|
|
<code>maint</code>. Your change will be placed into <code>seen</code> fairly early on by the maintainer
|
|
while it is still in the review process; from there, when it is ready for wider
|
|
testing, it will be merged into <code>next</code>. Plenty of early testers use <code>next</code> and
|
|
may report issues. Eventually, changes in <code>next</code> will make it to <code>master</code>,
|
|
which is typically considered stable. Finally, when a new release is cut,
|
|
<code>maint</code> is used to base bugfixes onto. As mentioned at the beginning of this
|
|
document, you can read <code>Documents/SubmittingPatches</code> for some more info about
|
|
the use of the various integration branches.</p>
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</div>
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<div class="paragraph">
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<p>Back to now: your code has been lauded by the upstream reviewers. It is perfect.
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It is ready to be accepted. You don’t need to do anything else; the maintainer
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will merge your topic branch to <code>next</code> and life is good.</p>
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</div>
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<div class="paragraph">
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<p>However, if you discover it isn’t so perfect after this point, you may need to
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take some special steps depending on where you are in the process.</p>
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</div>
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<div class="paragraph">
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<p>If the maintainer has announced in the "What’s cooking in git.git" email that
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your topic is marked for <code>next</code> - that is, that they plan to merge it to <code>next</code>
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|
but have not yet done so - you should send an email asking the maintainer to
|
|
wait a little longer: "I’ve sent v4 of my series and you marked it for <code>next</code>,
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|
but I need to change this and that - please wait for v5 before you merge it."</p>
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</div>
|
|
<div class="paragraph">
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<p>If the topic has already been merged to <code>next</code>, rather than modifying your
|
|
patches with <code>git</code> <code>rebase</code> <code>-i</code>, you should make further changes incrementally -
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|
that is, with another commit, based on top of the maintainer’s topic branch as
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|
detailed in <a href="https://github.com/gitster/git" class="bare">https://github.com/gitster/git</a>. Your work is still in the same topic
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|
but is now incremental, rather than a wholesale rewrite of the topic branch.</p>
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|
</div>
|
|
<div class="paragraph">
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|
<p>The topic branches in the maintainer’s GitHub are mirrored in GitGitGadget, so
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|
if you’re sending your reviews out that way, you should be sure to open your PR
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|
against the appropriate GitGitGadget/Git branch.</p>
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</div>
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|
<div class="paragraph">
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<p>If you’re using <code>git</code> <code>send-email</code>, you can use it the same way as before, but you
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|
should generate your diffs from <em><topic></em><code>..</code><em><mybranch></em> and base your work on
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|
<em><topic></em> instead of <code>master</code>.</p>
|
|
</div>
|
|
</div>
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</div>
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</div>
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|
</div>
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|
<div id="footnotes">
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|
<hr/>
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|
<div class="footnote" id="_footnotedef_1">
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<a href="#_footnoteref_1">1</a>. Scripts under `contrib/` are not part of the core `git` binary and must be called directly. Clone the Git codebase and run `perl contrib/contacts/git-contacts`.
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</div>
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</div>
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<div id="footer">
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<div id="footer-text">
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Last updated 2025-03-17 07:09:38 UTC
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