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<body class="manpage">
<div id="header">
<h1>git-interpret-trailers(1) Manual Page</h1>
<h2 id="_name">NAME</h2>
<div class="sectionbody">
<p>git-interpret-trailers - Add or parse structured information in commit messages</p>
</div>
</div>
<div id="content">
<div class="sect1">
<h2 id="_synopsis">SYNOPSIS</h2>
<div class="sectionbody">
<div class="verseblock">
<pre class="content"><em>git interpret-trailers</em> [--in-place] [--trim-empty]
[(--trailer (<key>|<keyAlias>)[(=|:)<value>])…​]
[--parse] [<file>…​]</pre>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Add or parse <em>trailer</em> lines that look similar to RFC 822 e-mail
headers, at the end of the otherwise free-form part of a commit
message. For example, in the following commit message</p>
</div>
<div class="listingblock">
<div class="content">
<pre>subject
Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Signed-off-by: Alice <alice@example.com>
Signed-off-by: Bob <bob@example.com></pre>
</div>
</div>
<div class="paragraph">
<p>the last two lines starting with "Signed-off-by" are trailers.</p>
</div>
<div class="paragraph">
<p>This command reads commit messages from either the
<file> arguments or the standard input if no <file> is specified.
If <code>--parse</code> is specified, the output consists of the parsed trailers
coming from the input, without influencing them with any command line
options or configuration variables.</p>
</div>
<div class="paragraph">
<p>Otherwise, this command applies <code>trailer.*</code> configuration variables
(which could potentially add new trailers, as well as reposition them),
as well as any command line arguments that can override configuration
variables (such as <code>--trailer=...</code> which could also add new trailers),
to each input file. The result is emitted on the standard output.</p>
</div>
<div class="paragraph">
<p>This command can also operate on the output of <a href="git-format-patch.html">git-format-patch(1)</a>,
which is more elaborate than a plain commit message. Namely, such output
includes a commit message (as above), a "---" divider line, and a patch part.
For these inputs, the divider and patch parts are not modified by
this command and are emitted as is on the output, unless
<code>--no-divider</code> is specified.</p>
</div>
<div class="paragraph">
<p>Some configuration variables control the way the <code>--trailer</code> arguments
are applied to each input and the way any existing trailer in
the input is changed. They also make it possible to
automatically add some trailers.</p>
</div>
<div class="paragraph">
<p>By default, a <em><key>=<value></em> or <em><key>:<value></em> argument given
using <code>--trailer</code> will be appended after the existing trailers only if
the last trailer has a different (<key>, <value>) pair (or if there
is no existing trailer). The <key> and <value> parts will be trimmed
to remove starting and trailing whitespace, and the resulting trimmed
<key> and <value> will appear in the output like this:</p>
</div>
<div class="listingblock">
<div class="content">
<pre>key: value</pre>
</div>
</div>
<div class="paragraph">
<p>This means that the trimmed <key> and <value> will be separated by
<code>': '</code> (one colon followed by one space).</p>
</div>
<div class="paragraph">
<p>For convenience, a <keyAlias> can be configured to make using <code>--trailer</code>
shorter to type on the command line. This can be configured using the
<em>trailer.<keyAlias>.key</em> configuration variable. The <keyAlias> must be a prefix
of the full <key> string, although case sensitivity does not matter. For
example, if you have</p>
</div>
<div class="listingblock">
<div class="content">
<pre>trailer.sign.key "Signed-off-by: "</pre>
</div>
</div>
<div class="paragraph">
<p>in your configuration, you only need to specify <code>--trailer="sign: foo"</code>
on the command line instead of <code>--trailer="Signed-off-by: foo"</code>.</p>
</div>
<div class="paragraph">
<p>By default the new trailer will appear at the end of all the existing
trailers. If there is no existing trailer, the new trailer will appear
at the end of the input. A blank line will be added before the new
trailer if there isn’t one already.</p>
</div>
<div class="paragraph">
<p>Existing trailers are extracted from the input by looking for
a group of one or more lines that (i) is all trailers, or (ii) contains at
least one Git-generated or user-configured trailer and consists of at
least 25% trailers.
The group must be preceded by one or more empty (or whitespace-only) lines.
The group must either be at the end of the input or be the last
non-whitespace lines before a line that starts with <em>---</em> (followed by a
space or the end of the line).</p>
</div>
<div class="paragraph">
<p>When reading trailers, there can be no whitespace before or inside the
<key>, but any number of regular space and tab characters are allowed
between the <key> and the separator. There can be whitespaces before,
inside or after the <value>. The <value> may be split over multiple lines
with each subsequent line starting with at least one whitespace, like
the "folding" in RFC 822. Example:</p>
</div>
<div class="listingblock">
<div class="content">
<pre>key: This is a very long value, with spaces and
newlines in it.</pre>
</div>
</div>
<div class="paragraph">
<p>Note that trailers do not follow (nor are they intended to follow) many of the
rules for RFC 822 headers. For example they do not follow the encoding rule.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_options">OPTIONS</h2>
<div class="sectionbody">
<div class="dlist">
<dl>
<dt class="hdlist1">--in-place</dt>
<dd>
<p>Edit the files in place.</p>
</dd>
<dt class="hdlist1">--trim-empty</dt>
<dd>
<p>If the <value> part of any trailer contains only whitespace,
the whole trailer will be removed from the output.
This applies to existing trailers as well as new trailers.</p>
</dd>
<dt class="hdlist1">--trailer <key>[(=|:)<value>]</dt>
<dd>
<p>Specify a (<key>, <value>) pair that should be applied as a
trailer to the inputs. See the description of this
command.</p>
</dd>
<dt class="hdlist1">--where <placement></dt>
<dt class="hdlist1">--no-where</dt>
<dd>
<p>Specify where all new trailers will be added. A setting
provided with <em>--where</em> overrides the <code>trailer.where</code> and any
applicable <code>trailer.<keyAlias>.where</code> configuration variables
and applies to all <em>--trailer</em> options until the next occurrence of
<em>--where</em> or <em>--no-where</em>. Upon encountering <em>--no-where</em>, clear the
effect of any previous use of <em>--where</em>, such that the relevant configuration
variables are no longer overridden. Possible placements are <code>after</code>,
<code>before</code>, <code>end</code> or <code>start</code>.</p>
</dd>
<dt class="hdlist1">--if-exists <action></dt>
<dt class="hdlist1">--no-if-exists</dt>
<dd>
<p>Specify what action will be performed when there is already at
least one trailer with the same <key> in the input. A setting
provided with <em>--if-exists</em> overrides the <code>trailer.ifExists</code> and any
applicable <code>trailer.<keyAlias>.ifExists</code> configuration variables
and applies to all <em>--trailer</em> options until the next occurrence of
<em>--if-exists</em> or <em>--no-if-exists</em>. Upon encountering '--no-if-exists, clear the
effect of any previous use of '--if-exists, such that the relevant configuration
variables are no longer overridden. Possible actions are <code>addIfDifferent</code>,
<code>addIfDifferentNeighbor</code>, <code>add</code>, <code>replace</code> and <code>doNothing</code>.</p>
</dd>
<dt class="hdlist1">--if-missing <action></dt>
<dt class="hdlist1">--no-if-missing</dt>
<dd>
<p>Specify what action will be performed when there is no other
trailer with the same <key> in the input. A setting
provided with <em>--if-missing</em> overrides the <code>trailer.ifMissing</code> and any
applicable <code>trailer.<keyAlias>.ifMissing</code> configuration variables
and applies to all <em>--trailer</em> options until the next occurrence of
<em>--if-missing</em> or <em>--no-if-missing</em>. Upon encountering '--no-if-missing,
clear the effect of any previous use of '--if-missing, such that the relevant
configuration variables are no longer overridden. Possible actions are <code>doNothing</code>
or <code>add</code>.</p>
</dd>
<dt class="hdlist1">--only-trailers</dt>
<dd>
<p>Output only the trailers, not any other parts of the input.</p>
</dd>
<dt class="hdlist1">--only-input</dt>
<dd>
<p>Output only trailers that exist in the input; do not add any
from the command-line or by applying <code>trailer.*</code> configuration
variables.</p>
</dd>
<dt class="hdlist1">--unfold</dt>
<dd>
<p>If a trailer has a value that runs over multiple lines (aka "folded"),
reformat the value into a single line.</p>
</dd>
<dt class="hdlist1">--parse</dt>
<dd>
<p>A convenience alias for <code>--only-trailers --only-input
--unfold</code>. This makes it easier to only see the trailers coming from the
input without influencing them with any command line options or
configuration variables, while also making the output machine-friendly with
--unfold.</p>
</dd>
<dt class="hdlist1">--no-divider</dt>
<dd>
<p>Do not treat <code>---</code> as the end of the commit message. Use this
when you know your input contains just the commit message itself
(and not an email or the output of <code>git format-patch</code>).</p>
</dd>
</dl>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_configuration_variables">CONFIGURATION VARIABLES</h2>
<div class="sectionbody">
<div class="dlist">
<dl>
<dt class="hdlist1">trailer.separators</dt>
<dd>
<p>This option tells which characters are recognized as trailer
separators. By default only <em>:</em> is recognized as a trailer
separator, except that <em>=</em> is always accepted on the command
line for compatibility with other git commands.</p>
<div class="paragraph">
<p>The first character given by this option will be the default character
used when another separator is not specified in the config for this
trailer.</p>
</div>
<div class="paragraph">
<p>For example, if the value for this option is "%=$", then only lines
using the format <em><key><sep><value></em> with <sep> containing <em>%</em>, <em>=</em>
or <em>$</em> and then spaces will be considered trailers. And <em>%</em> will be
the default separator used, so by default trailers will appear like:
<em><key>% <value></em> (one percent sign and one space will appear between
the key and the value).</p>
</div>
</dd>
<dt class="hdlist1">trailer.where</dt>
<dd>
<p>This option tells where a new trailer will be added.</p>
<div class="paragraph">
<p>This can be <code>end</code>, which is the default, <code>start</code>, <code>after</code> or <code>before</code>.</p>
</div>
<div class="paragraph">
<p>If it is <code>end</code>, then each new trailer will appear at the end of the
existing trailers.</p>
</div>
<div class="paragraph">
<p>If it is <code>start</code>, then each new trailer will appear at the start,
instead of the end, of the existing trailers.</p>
</div>
<div class="paragraph">
<p>If it is <code>after</code>, then each new trailer will appear just after the
last trailer with the same <key>.</p>
</div>
<div class="paragraph">
<p>If it is <code>before</code>, then each new trailer will appear just before the
first trailer with the same <key>.</p>
</div>
</dd>
<dt class="hdlist1">trailer.ifexists</dt>
<dd>
<p>This option makes it possible to choose what action will be
performed when there is already at least one trailer with the
same <key> in the input.</p>
<div class="paragraph">
<p>The valid values for this option are: <code>addIfDifferentNeighbor</code> (this
is the default), <code>addIfDifferent</code>, <code>add</code>, <code>replace</code> or <code>doNothing</code>.</p>
</div>
<div class="paragraph">
<p>With <code>addIfDifferentNeighbor</code>, a new trailer will be added only if no
trailer with the same (<key>, <value>) pair is above or below the line
where the new trailer will be added.</p>
</div>
<div class="paragraph">
<p>With <code>addIfDifferent</code>, a new trailer will be added only if no trailer
with the same (<key>, <value>) pair is already in the input.</p>
</div>
<div class="paragraph">
<p>With <code>add</code>, a new trailer will be added, even if some trailers with
the same (<key>, <value>) pair are already in the input.</p>
</div>
<div class="paragraph">
<p>With <code>replace</code>, an existing trailer with the same <key> will be
deleted and the new trailer will be added. The deleted trailer will be
the closest one (with the same <key>) to the place where the new one
will be added.</p>
</div>
<div class="paragraph">
<p>With <code>doNothing</code>, nothing will be done; that is no new trailer will be
added if there is already one with the same <key> in the input.</p>
</div>
</dd>
<dt class="hdlist1">trailer.ifmissing</dt>
<dd>
<p>This option makes it possible to choose what action will be
performed when there is not yet any trailer with the same
<key> in the input.</p>
<div class="paragraph">
<p>The valid values for this option are: <code>add</code> (this is the default) and
<code>doNothing</code>.</p>
</div>
<div class="paragraph">
<p>With <code>add</code>, a new trailer will be added.</p>
</div>
<div class="paragraph">
<p>With <code>doNothing</code>, nothing will be done.</p>
</div>
</dd>
<dt class="hdlist1">trailer.<keyAlias>.key</dt>
<dd>
<p>Defines a <keyAlias> for the <key>. The <keyAlias> must be a
prefix (case does not matter) of the <key>. For example, in <code>git
config trailer.ack.key "Acked-by"</code> the "Acked-by" is the <key> and
the "ack" is the <keyAlias>. This configuration allows the shorter
<code>--trailer "ack:..."</code> invocation on the command line using the "ack"
<keyAlias> instead of the longer <code>--trailer "Acked-by:..."</code>.</p>
<div class="paragraph">
<p>At the end of the <key>, a separator can appear and then some
space characters. By default the only valid separator is <em>:</em>,
but this can be changed using the <code>trailer.separators</code> config
variable.</p>
</div>
<div class="paragraph">
<p>If there is a separator in the key, then it overrides the default
separator when adding the trailer.</p>
</div>
</dd>
<dt class="hdlist1">trailer.<keyAlias>.where</dt>
<dd>
<p>This option takes the same values as the <em>trailer.where</em>
configuration variable and it overrides what is specified by
that option for trailers with the specified <keyAlias>.</p>
</dd>
<dt class="hdlist1">trailer.<keyAlias>.ifexists</dt>
<dd>
<p>This option takes the same values as the <em>trailer.ifexists</em>
configuration variable and it overrides what is specified by
that option for trailers with the specified <keyAlias>.</p>
</dd>
<dt class="hdlist1">trailer.<keyAlias>.ifmissing</dt>
<dd>
<p>This option takes the same values as the <em>trailer.ifmissing</em>
configuration variable and it overrides what is specified by
that option for trailers with the specified <keyAlias>.</p>
</dd>
<dt class="hdlist1">trailer.<keyAlias>.command</dt>
<dd>
<p>Deprecated in favor of <em>trailer.<keyAlias>.cmd</em>.
This option behaves in the same way as <em>trailer.<keyAlias>.cmd</em>, except
that it doesn’t pass anything as argument to the specified command.
Instead the first occurrence of substring $ARG is replaced by the
<value> that would be passed as argument.</p>
<div class="paragraph">
<p>Note that $ARG in the user’s command is
only replaced once and that the original way of replacing $ARG is not safe.</p>
</div>
<div class="paragraph">
<p>When both <em>trailer.<keyAlias>.cmd</em> and <em>trailer.<keyAlias>.command</em> are given
for the same <keyAlias>, <em>trailer.<keyAlias>.cmd</em> is used and
<em>trailer.<keyAlias>.command</em> is ignored.</p>
</div>
</dd>
<dt class="hdlist1">trailer.<keyAlias>.cmd</dt>
<dd>
<p>This option can be used to specify a shell command that will be called
once to automatically add a trailer with the specified <keyAlias>, and then
called each time a <em>--trailer <keyAlias>=<value></em> argument is specified to
modify the <value> of the trailer that this option would produce.</p>
<div class="paragraph">
<p>When the specified command is first called to add a trailer
with the specified <keyAlias>, the behavior is as if a special
<em>--trailer <keyAlias>=<value></em> argument was added at the beginning
of the "git interpret-trailers" command, where <value>
is taken to be the standard output of the command with any
leading and trailing whitespace trimmed off.</p>
</div>
<div class="paragraph">
<p>If some <em>--trailer <keyAlias>=<value></em> arguments are also passed
on the command line, the command is called again once for each
of these arguments with the same <keyAlias>. And the <value> part
of these arguments, if any, will be passed to the command as its
first argument. This way the command can produce a <value> computed
from the <value> passed in the <em>--trailer <keyAlias>=<value></em> argument.</p>
</div>
</dd>
</dl>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_examples">EXAMPLES</h2>
<div class="sectionbody">
<div class="ulist">
<ul>
<li>
<p>Configure a <em>sign</em> trailer with a <em>Signed-off-by</em> key, and then
add two of these trailers to a commit message file:</p>
<div class="listingblock">
<div class="content">
<pre>$ git config trailer.sign.key "Signed-off-by"
$ cat msg.txt
subject
body text
$ git interpret-trailers --trailer 'sign: Alice <alice@example.com>' --trailer 'sign: Bob <bob@example.com>' <msg.txt
subject
body text
Signed-off-by: Alice <alice@example.com>
Signed-off-by: Bob <bob@example.com></pre>
</div>
</div>
</li>
<li>
<p>Use the <code>--in-place</code> option to edit a commit message file in place:</p>
<div class="listingblock">
<div class="content">
<pre>$ cat msg.txt
subject
body text
Signed-off-by: Bob <bob@example.com>
$ git interpret-trailers --trailer 'Acked-by: Alice <alice@example.com>' --in-place msg.txt
$ cat msg.txt
subject
body text
Signed-off-by: Bob <bob@example.com>
Acked-by: Alice <alice@example.com></pre>
</div>
</div>
</li>
<li>
<p>Extract the last commit as a patch, and add a <em>Cc</em> and a
<em>Reviewed-by</em> trailer to it:</p>
<div class="listingblock">
<div class="content">
<pre>$ git format-patch -1
0001-foo.patch
$ git interpret-trailers --trailer 'Cc: Alice <alice@example.com>' --trailer 'Reviewed-by: Bob <bob@example.com>' 0001-foo.patch >0001-bar.patch</pre>
</div>
</div>
</li>
<li>
<p>Configure a <em>sign</em> trailer with a command to automatically add a
'Signed-off-by: ' with the author information only if there is no
'Signed-off-by: ' already, and show how it works:</p>
<div class="listingblock">
<div class="content">
<pre>$ cat msg1.txt
subject
body text
$ git config trailer.sign.key "Signed-off-by: "
$ git config trailer.sign.ifmissing add
$ git config trailer.sign.ifexists doNothing
$ git config trailer.sign.cmd 'echo "$(git config user.name) <$(git config user.email)>"'
$ git interpret-trailers --trailer sign <msg1.txt
subject
body text
Signed-off-by: Bob <bob@example.com>
$ cat msg2.txt
subject
body text
Signed-off-by: Alice <alice@example.com>
$ git interpret-trailers --trailer sign <msg2.txt
subject
body text
Signed-off-by: Alice <alice@example.com></pre>
</div>
</div>
</li>
<li>
<p>Configure a <em>fix</em> trailer with a key that contains a <em>#</em> and no
space after this character, and show how it works:</p>
<div class="listingblock">
<div class="content">
<pre>$ git config trailer.separators ":#"
$ git config trailer.fix.key "Fix #"
$ echo "subject" | git interpret-trailers --trailer fix=42
subject
Fix #42</pre>
</div>
</div>
</li>
<li>
<p>Configure a <em>help</em> trailer with a cmd use a script <code>glog-find-author</code>
which search specified author identity from git log in git repository
and show how it works:</p>
<div class="listingblock">
<div class="content">
<pre>$ cat ~/bin/glog-find-author
#!/bin/sh
test -n "$1" && git log --author="$1" --pretty="%an <%ae>" -1 || true
$ cat msg.txt
subject
body text
$ git config trailer.help.key "Helped-by: "
$ git config trailer.help.ifExists "addIfDifferentNeighbor"
$ git config trailer.help.cmd "~/bin/glog-find-author"
$ git interpret-trailers --trailer="help:Junio" --trailer="help:Couder" <msg.txt
subject
body text
Helped-by: Junio C Hamano <gitster@pobox.com>
Helped-by: Christian Couder <christian.couder@gmail.com></pre>
</div>
</div>
</li>
<li>
<p>Configure a <em>ref</em> trailer with a cmd use a script <code>glog-grep</code>
to grep last relevant commit from git log in the git repository
and show how it works:</p>
<div class="listingblock">
<div class="content">
<pre>$ cat ~/bin/glog-grep
#!/bin/sh
test -n "$1" && git log --grep "$1" --pretty=reference -1 || true
$ cat msg.txt
subject
body text
$ git config trailer.ref.key "Reference-to: "
$ git config trailer.ref.ifExists "replace"
$ git config trailer.ref.cmd "~/bin/glog-grep"
$ git interpret-trailers --trailer="ref:Add copyright notices." <msg.txt
subject
body text
Reference-to: 8bc9a0c769 (Add copyright notices., 2005-04-07)</pre>
</div>
</div>
</li>
<li>
<p>Configure a <em>see</em> trailer with a command to show the subject of a
commit that is related, and show how it works:</p>
<div class="listingblock">
<div class="content">
<pre>$ cat msg.txt
subject
body text
see: HEAD~2
$ cat ~/bin/glog-ref
#!/bin/sh
git log -1 --oneline --format="%h (%s)" --abbrev-commit --abbrev=14
$ git config trailer.see.key "See-also: "
$ git config trailer.see.ifExists "replace"
$ git config trailer.see.ifMissing "doNothing"
$ git config trailer.see.cmd "glog-ref"
$ git interpret-trailers --trailer=see <msg.txt
subject
body text
See-also: fe3187489d69c4 (subject of related commit)</pre>
</div>
</div>
</li>
<li>
<p>Configure a commit template with some trailers with empty values
(using sed to show and keep the trailing spaces at the end of the
trailers), then configure a commit-msg hook that uses
<em>git interpret-trailers</em> to remove trailers with empty values and
to add a <em>git-version</em> trailer:</p>
<div class="listingblock">
<div class="content">
<pre>$ cat temp.txt
***subject***
***message***
Fixes: Z
Cc: Z
Reviewed-by: Z
Signed-off-by: Z
$ sed -e 's/ Z$/ /' temp.txt > commit_template.txt
$ git config commit.template commit_template.txt
$ cat .git/hooks/commit-msg
#!/bin/sh
git interpret-trailers --trim-empty --trailer "git-version: \$(git describe)" "\$1" > "\$1.new"
mv "\$1.new" "\$1"
$ chmod +x .git/hooks/commit-msg</pre>
</div>
</div>
</li>
</ul>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_see_also">SEE ALSO</h2>
<div class="sectionbody">
<div class="paragraph">
<p><a href="git-commit.html">git-commit(1)</a>, <a href="git-format-patch.html">git-format-patch(1)</a>, <a href="git-config.html">git-config(1)</a></p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_git">GIT</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Part of the <a href="git.html">git(1)</a> suite</p>
</div>
</div>
</div>
</div>
<div id="footer">
<div id="footer-text">
Last updated 2024-05-31 00:41:06 UTC
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Zerion Mini Shell 1.0