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<body class="manpage">
<div id="header">
<h1>githooks(5) Manual Page</h1>
<h2 id="_name">NAME</h2>
<div class="sectionbody">
<p>githooks - Hooks used by Git</p>
</div>
</div>
<div id="content">
<div class="sect1">
<h2 id="_synopsis">SYNOPSIS</h2>
<div class="sectionbody">
<div class="paragraph">
<p>$GIT_DIR/hooks/* (or `git config core.hooksPath`/*)</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Hooks are programs you can place in a hooks directory to trigger
actions at certain points in git&#8217;s execution. Hooks that don&#8217;t have
the executable bit set are ignored.</p>
</div>
<div class="paragraph">
<p>By default the hooks directory is <code>$GIT_DIR/hooks</code>, but that can be
changed via the <code>core.hooksPath</code> configuration variable (see
<a href="git-config.html">git-config(1)</a>).</p>
</div>
<div class="paragraph">
<p>Before Git invokes a hook, it changes its working directory to either
$GIT_DIR in a bare repository or the root of the working tree in a non-bare
repository. An exception are hooks triggered during a push (<em>pre-receive</em>,
<em>update</em>, <em>post-receive</em>, <em>post-update</em>, <em>push-to-checkout</em>) which are always
executed in $GIT_DIR.</p>
</div>
<div class="paragraph">
<p>Environment variables, such as <code>GIT_DIR</code>, <code>GIT_WORK_TREE</code>, etc., are exported
so that Git commands run by the hook can correctly locate the repository. If
your hook needs to invoke Git commands in a foreign repository or in a
different working tree of the same repository, then it should clear these
environment variables so they do not interfere with Git operations at the
foreign location. For example:</p>
</div>
<div class="listingblock">
<div class="content">
<pre>local_desc=$(git describe)
foreign_desc=$(unset $(git rev-parse --local-env-vars); git -C ../foreign-repo describe)</pre>
</div>
</div>
<div class="paragraph">
<p>Hooks can get their arguments via the environment, command-line
arguments, and stdin. See the documentation for each hook below for
details.</p>
</div>
<div class="paragraph">
<p><code>git</code> <code>init</code> may copy hooks to the new repository, depending on its
configuration. See the "TEMPLATE DIRECTORY" section in
<a href="git-init.html">git-init(1)</a> for details. When the rest of this document refers
to "default hooks" it&#8217;s talking about the default template shipped
with Git.</p>
</div>
<div class="paragraph">
<p>The currently supported hooks are described below.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_hooks">HOOKS</h2>
<div class="sectionbody">
<div class="sect2">
<h3 id="_applypatch_msg">applypatch-msg</h3>
<div class="paragraph">
<p>This hook is invoked by <a href="git-am.html">git-am(1)</a>. It takes a single
parameter, the name of the file that holds the proposed commit
log message. Exiting with a non-zero status causes <code>git</code> <code>am</code> to abort
before applying the patch.</p>
</div>
<div class="paragraph">
<p>The hook is allowed to edit the message file in place, and can
be used to normalize the message into some project standard
format. It can also be used to refuse the commit after inspecting
the message file.</p>
</div>
<div class="paragraph">
<p>The default <em>applypatch-msg</em> hook, when enabled, runs the
<em>commit-msg</em> hook, if the latter is enabled.</p>
</div>
</div>
<div class="sect2">
<h3 id="_pre_applypatch">pre-applypatch</h3>
<div class="paragraph">
<p>This hook is invoked by <a href="git-am.html">git-am(1)</a>. It takes no parameter, and is
invoked after the patch is applied, but before a commit is made.</p>
</div>
<div class="paragraph">
<p>If it exits with non-zero status, then the working tree will not be
committed after applying the patch.</p>
</div>
<div class="paragraph">
<p>It can be used to inspect the current working tree and refuse to
make a commit if it does not pass certain tests.</p>
</div>
<div class="paragraph">
<p>The default <em>pre-applypatch</em> hook, when enabled, runs the
<em>pre-commit</em> hook, if the latter is enabled.</p>
</div>
</div>
<div class="sect2">
<h3 id="_post_applypatch">post-applypatch</h3>
<div class="paragraph">
<p>This hook is invoked by <a href="git-am.html">git-am(1)</a>. It takes no parameter,
and is invoked after the patch is applied and a commit is made.</p>
</div>
<div class="paragraph">
<p>This hook is meant primarily for notification, and cannot affect
the outcome of <code>git</code> <code>am</code>.</p>
</div>
</div>
<div class="sect2">
<h3 id="_pre_commit">pre-commit</h3>
<div class="paragraph">
<p>This hook is invoked by <a href="git-commit.html">git-commit(1)</a>, and can be bypassed
with the <code>--no-verify</code> option. It takes no parameters, and is
invoked before obtaining the proposed commit log message and
making a commit. Exiting with a non-zero status from this script
causes the <code>git</code> <code>commit</code> command to abort before creating a commit.</p>
</div>
<div class="paragraph">
<p>The default <em>pre-commit</em> hook, when enabled, catches introduction
of lines with trailing whitespaces and aborts the commit when
such a line is found.</p>
</div>
<div class="paragraph">
<p>All the <code>git</code> <code>commit</code> hooks are invoked with the environment
variable <code>GIT_EDITOR=:</code> if the command will not bring up an editor
to modify the commit message.</p>
</div>
<div class="paragraph">
<p>The default <em>pre-commit</em> hook, when enabled&#8212;&#8203;and with the
<code>hooks.allownonascii</code> config option unset or set to false&#8212;&#8203;prevents
the use of non-ASCII filenames.</p>
</div>
</div>
<div class="sect2">
<h3 id="_pre_merge_commit">pre-merge-commit</h3>
<div class="paragraph">
<p>This hook is invoked by <a href="git-merge.html">git-merge(1)</a>, and can be bypassed
with the <code>--no-verify</code> option. It takes no parameters, and is
invoked after the merge has been carried out successfully and before
obtaining the proposed commit log message to
make a commit. Exiting with a non-zero status from this script
causes the <code>git</code> <code>merge</code> command to abort before creating a commit.</p>
</div>
<div class="paragraph">
<p>The default <em>pre-merge-commit</em> hook, when enabled, runs the
<em>pre-commit</em> hook, if the latter is enabled.</p>
</div>
<div class="paragraph">
<p>This hook is invoked with the environment variable
<code>GIT_EDITOR=:</code> if the command will not bring up an editor
to modify the commit message.</p>
</div>
<div class="paragraph">
<p>If the merge cannot be carried out automatically, the conflicts
need to be resolved and the result committed separately (see
<a href="git-merge.html">git-merge(1)</a>). At that point, this hook will not be executed,
but the <em>pre-commit</em> hook will, if it is enabled.</p>
</div>
</div>
<div class="sect2">
<h3 id="_prepare_commit_msg">prepare-commit-msg</h3>
<div class="paragraph">
<p>This hook is invoked by <a href="git-commit.html">git-commit(1)</a> right after preparing the
default log message, and before the editor is started.</p>
</div>
<div class="paragraph">
<p>It takes one to three parameters. The first is the name of the file
that contains the commit log message. The second is the source of the commit
message, and can be: <code>message</code> (if a <code>-m</code> or <code>-F</code> option was
given); <code>template</code> (if a <code>-t</code> option was given or the
configuration option <code>commit.template</code> is set); <code>merge</code> (if the
commit is a merge or a .<code>git/MERGE_MSG</code> file exists); <code>squash</code>
(if a .<code>git/SQUASH_MSG</code> file exists); or <code>commit</code>, followed by
a commit object name (if a <code>-c</code>, <code>-C</code> or <code>--amend</code> option was given).</p>
</div>
<div class="paragraph">
<p>If the exit status is non-zero, <code>git</code> <code>commit</code> will abort.</p>
</div>
<div class="paragraph">
<p>The purpose of the hook is to edit the message file in place, and
it is not suppressed by the <code>--no-verify</code> option. A non-zero exit
means a failure of the hook and aborts the commit. It should not
be used as a replacement for the pre-commit hook.</p>
</div>
<div class="paragraph">
<p>The sample <code>prepare-commit-msg</code> hook that comes with Git removes the
help message found in the commented portion of the commit template.</p>
</div>
</div>
<div class="sect2">
<h3 id="_commit_msg">commit-msg</h3>
<div class="paragraph">
<p>This hook is invoked by <a href="git-commit.html">git-commit(1)</a> and <a href="git-merge.html">git-merge(1)</a>, and can be
bypassed with the <code>--no-verify</code> option. It takes a single parameter,
the name of the file that holds the proposed commit log message.
Exiting with a non-zero status causes the command to abort.</p>
</div>
<div class="paragraph">
<p>The hook is allowed to edit the message file in place, and can be used
to normalize the message into some project standard format. It
can also be used to refuse the commit after inspecting the message
file.</p>
</div>
<div class="paragraph">
<p>The default <em>commit-msg</em> hook, when enabled, detects duplicate
<code>Signed-off-by</code> trailers, and aborts the commit if one is found.</p>
</div>
</div>
<div class="sect2">
<h3 id="_post_commit">post-commit</h3>
<div class="paragraph">
<p>This hook is invoked by <a href="git-commit.html">git-commit(1)</a>. It takes no parameters, and is
invoked after a commit is made.</p>
</div>
<div class="paragraph">
<p>This hook is meant primarily for notification, and cannot affect
the outcome of <code>git</code> <code>commit</code>.</p>
</div>
</div>
<div class="sect2">
<h3 id="_pre_rebase">pre-rebase</h3>
<div class="paragraph">
<p>This hook is called by <a href="git-rebase.html">git-rebase(1)</a> and can be used to prevent a
branch from getting rebased. The hook may be called with one or
two parameters. The first parameter is the upstream from which
the series was forked. The second parameter is the branch being
rebased, and is not set when rebasing the current branch.</p>
</div>
</div>
<div class="sect2">
<h3 id="_post_checkout">post-checkout</h3>
<div class="paragraph">
<p>This hook is invoked when a <a href="git-checkout.html">git-checkout(1)</a> or
<a href="git-switch.html">git-switch(1)</a> is run after having updated the
worktree. The hook is given three parameters: the ref of the previous HEAD,
the ref of the new HEAD (which may or may not have changed), and a flag
indicating whether the checkout was a branch checkout (changing branches,
flag=1) or a file checkout (retrieving a file from the index, flag=0).
This hook cannot affect the outcome of <code>git</code> <code>switch</code> or <code>git</code> <code>checkout</code>,
other than that the hook&#8217;s exit status becomes the exit status of
these two commands.</p>
</div>
<div class="paragraph">
<p>It is also run after <a href="git-clone.html">git-clone(1)</a>, unless the <code>--no-checkout</code> (<code>-n</code>) option is
used. The first parameter given to the hook is the null-ref, the second the
ref of the new HEAD and the flag is always 1. Likewise for <code>git</code> <code>worktree</code> <code>add</code>
unless <code>--no-checkout</code> is used.</p>
</div>
<div class="paragraph">
<p>This hook can be used to perform repository validity checks, auto-display
differences from the previous HEAD if different, or set working dir metadata
properties.</p>
</div>
</div>
<div class="sect2">
<h3 id="_post_merge">post-merge</h3>
<div class="paragraph">
<p>This hook is invoked by <a href="git-merge.html">git-merge(1)</a>, which happens when a <code>git</code> <code>pull</code>
is done on a local repository. The hook takes a single parameter, a status
flag specifying whether or not the merge being done was a squash merge.
This hook cannot affect the outcome of <code>git</code> <code>merge</code> and is not executed,
if the merge failed due to conflicts.</p>
</div>
<div class="paragraph">
<p>This hook can be used in conjunction with a corresponding pre-commit hook to
save and restore any form of metadata associated with the working tree
(e.g.: permissions/ownership, ACLS, etc). See contrib/hooks/setgitperms.perl
for an example of how to do this.</p>
</div>
</div>
<div class="sect2">
<h3 id="_pre_push">pre-push</h3>
<div class="paragraph">
<p>This hook is called by <a href="git-push.html">git-push(1)</a> and can be used to prevent
a push from taking place. The hook is called with two parameters
which provide the name and location of the destination remote, if a
named remote is not being used both values will be the same.</p>
</div>
<div class="paragraph">
<p>Information about what is to be pushed is provided on the hook&#8217;s standard
input with lines of the form:</p>
</div>
<div class="literalblock">
<div class="content">
<pre>&lt;local-ref&gt; SP &lt;local-object-name&gt; SP &lt;remote-ref&gt; SP &lt;remote-object-name&gt; LF</pre>
</div>
</div>
<div class="paragraph">
<p>For instance, if the command <code>git</code> <code>push</code> <code>origin</code> <code>master:foreign</code> were run the
hook would receive a line like the following:</p>
</div>
<div class="literalblock">
<div class="content">
<pre>refs/heads/master 67890 refs/heads/foreign 12345</pre>
</div>
</div>
<div class="paragraph">
<p>although the full object name would be supplied. If the foreign ref does not
yet exist the <em>&lt;remote-object-name&gt;</em> will be the all-zeroes object name. If a
ref is to be deleted, the <em>&lt;local-ref&gt;</em> will be supplied as (<code>delete</code>) and the
<em>&lt;local-object-name&gt;</em> will be the all-zeroes object name. If the local commit
was specified by something other than a name which could be expanded (such as
<code>HEAD~</code>, or an object name) it will be supplied as it was originally given.</p>
</div>
<div class="paragraph">
<p>If this hook exits with a non-zero status, <code>git</code> <code>push</code> will abort without
pushing anything. Information about why the push is rejected may be sent
to the user by writing to standard error.</p>
</div>
</div>
<div class="sect2">
<h3 id="pre-receive">pre-receive</h3>
<div class="paragraph">
<p>This hook is invoked by <a href="git-receive-pack.html">git-receive-pack(1)</a> when it reacts to
<code>git</code> <code>push</code> and updates reference(s) in its repository.
Just before starting to update refs on the remote repository, the
pre-receive hook is invoked. Its exit status determines the success
or failure of the update.</p>
</div>
<div class="paragraph">
<p>This hook executes once for the receive operation. It takes no
arguments, but for each ref to be updated it receives on standard
input a line of the format:</p>
</div>
<div class="literalblock">
<div class="content">
<pre>&lt;old-oid&gt; SP &lt;new-oid&gt; SP &lt;ref-name&gt; LF</pre>
</div>
</div>
<div class="paragraph">
<p>where <em>&lt;old-oid&gt;</em> is the old object name stored in the ref,
<em>&lt;new-oid&gt;</em> is the new object name to be stored in the ref and
<em>&lt;ref-name&gt;</em> is the full name of the ref.
When creating a new ref, <em>&lt;old-oid&gt;</em> is the all-zeroes object name.</p>
</div>
<div class="paragraph">
<p>If the hook exits with non-zero status, none of the refs will be
updated. If the hook exits with zero, updating of individual refs can
still be prevented by the <a href="#update"><em>update</em></a> hook.</p>
</div>
<div class="paragraph">
<p>Both standard output and standard error output are forwarded to
<code>git</code> <code>send-pack</code> on the other end, so you can simply <code>echo</code> messages
for the user.</p>
</div>
<div class="paragraph">
<p>The number of push options given on the command line of
<code>git</code> <code>push</code> <code>--push-option=..</code>. can be read from the environment
variable <code>GIT_PUSH_OPTION_COUNT</code>, and the options themselves are
found in <code>GIT_PUSH_OPTION_0</code>, <code>GIT_PUSH_OPTION_1</code>,&#8230;&#8203;
If it is negotiated to not use the push options phase, the
environment variables will not be set. If the client selects
to use push options, but doesn&#8217;t transmit any, the count variable
will be set to zero, <code>GIT_PUSH_OPTION_COUNT=0</code>.</p>
</div>
<div class="paragraph">
<p>See the section on "Quarantine Environment" in
<a href="git-receive-pack.html">git-receive-pack(1)</a> for some caveats.</p>
</div>
</div>
<div class="sect2">
<h3 id="update">update</h3>
<div class="paragraph">
<p>This hook is invoked by <a href="git-receive-pack.html">git-receive-pack(1)</a> when it reacts to
<code>git</code> <code>push</code> and updates reference(s) in its repository.
Just before updating the ref on the remote repository, the update hook
is invoked. Its exit status determines the success or failure of
the ref update.</p>
</div>
<div class="paragraph">
<p>The hook executes once for each ref to be updated, and takes
three parameters:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>the name of the ref being updated,</p>
</li>
<li>
<p>the old object name stored in the ref,</p>
</li>
<li>
<p>and the new object name to be stored in the ref.</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>A zero exit from the update hook allows the ref to be updated.
Exiting with a non-zero status prevents <code>git</code> <code>receive-pack</code>
from updating that ref.</p>
</div>
<div class="paragraph">
<p>This hook can be used to prevent <em>forced</em> update on certain refs by
making sure that the object name is a commit object that is a
descendant of the commit object named by the old object name.
That is, to enforce a "fast-forward only" policy.</p>
</div>
<div class="paragraph">
<p>It could also be used to log the old..new status. However, it
does not know the entire set of branches, so it would end up
firing one e-mail per ref when used naively, though. The
<a href="#post-receive"><em>post-receive</em></a> hook is more suited to that.</p>
</div>
<div class="paragraph">
<p>In an environment that restricts the users' access only to git
commands over the wire, this hook can be used to implement access
control without relying on filesystem ownership and group
membership. See <a href="git-shell.html">git-shell(1)</a> for how you might use the login
shell to restrict the user&#8217;s access to only git commands.</p>
</div>
<div class="paragraph">
<p>Both standard output and standard error output are forwarded to
<code>git</code> <code>send-pack</code> on the other end, so you can simply <code>echo</code> messages
for the user.</p>
</div>
<div class="paragraph">
<p>The default <em>update</em> hook, when enabled&#8212;&#8203;and with
<code>hooks.allowunannotated</code> config option unset or set to false&#8212;&#8203;prevents
unannotated tags from being pushed.</p>
</div>
</div>
<div class="sect2">
<h3 id="proc-receive">proc-receive</h3>
<div class="paragraph">
<p>This hook is invoked by <a href="git-receive-pack.html">git-receive-pack(1)</a>. If the server has
set the multi-valued config variable <code>receive.procReceiveRefs</code>, and the
commands sent to <em>receive-pack</em> have matching reference names, these
commands will be executed by this hook, instead of by the internal
<code>execute_commands</code>() function. This hook is responsible for updating
the relevant references and reporting the results back to <em>receive-pack</em>.</p>
</div>
<div class="paragraph">
<p>This hook executes once for the receive operation. It takes no
arguments, but uses a pkt-line format protocol to communicate with
<em>receive-pack</em> to read commands, push-options and send results. In the
following example for the protocol, the letter <em>S</em> stands for
<em>receive-pack</em> and the letter <em>H</em> stands for this hook.</p>
</div>
<div class="literalblock">
<div class="content">
<pre># Version and features negotiation.
S: PKT-LINE(version=1\0push-options atomic...)
S: flush-pkt
H: PKT-LINE(version=1\0push-options...)
H: flush-pkt</pre>
</div>
</div>
<div class="literalblock">
<div class="content">
<pre># Send commands from server to the hook.
S: PKT-LINE(&lt;old-oid&gt; &lt;new-oid&gt; &lt;ref&gt;)
S: ... ...
S: flush-pkt
# Send push-options only if the 'push-options' feature is enabled.
S: PKT-LINE(push-option)
S: ... ...
S: flush-pkt</pre>
</div>
</div>
<div class="literalblock">
<div class="content">
<pre># Receive results from the hook.
# OK, run this command successfully.
H: PKT-LINE(ok &lt;ref&gt;)
# NO, I reject it.
H: PKT-LINE(ng &lt;ref&gt; &lt;reason&gt;)
# Fall through, let 'receive-pack' execute it.
H: PKT-LINE(ok &lt;ref&gt;)
H: PKT-LINE(option fall-through)
# OK, but has an alternate reference. The alternate reference name
# and other status can be given in option directives.
H: PKT-LINE(ok &lt;ref&gt;)
H: PKT-LINE(option refname &lt;refname&gt;)
H: PKT-LINE(option old-oid &lt;old-oid&gt;)
H: PKT-LINE(option new-oid &lt;new-oid&gt;)
H: PKT-LINE(option forced-update)
H: ... ...
H: flush-pkt</pre>
</div>
</div>
<div class="paragraph">
<p>Each command for the <em>proc-receive</em> hook may point to a pseudo-reference
and always has a zero-old as its old-oid, while the <em>proc-receive</em> hook
may update an alternate reference and the alternate reference may exist
already with a non-zero old-oid. For this case, this hook will use
"option" directives to report extended attributes for the reference given
by the leading "ok" directive.</p>
</div>
<div class="paragraph">
<p>The report of the commands of this hook should have the same order as
the input. The exit status of the <em>proc-receive</em> hook only determines
the success or failure of the group of commands sent to it, unless
atomic push is in use.</p>
</div>
</div>
<div class="sect2">
<h3 id="post-receive">post-receive</h3>
<div class="paragraph">
<p>This hook is invoked by <a href="git-receive-pack.html">git-receive-pack(1)</a> when it reacts to
<code>git</code> <code>push</code> and updates reference(s) in its repository.
The hook executes on the remote repository once after all the proposed
ref updates are processed and if at least one ref is updated as the
result.</p>
</div>
<div class="paragraph">
<p>The hook takes no arguments. It receives one line on standard input for
each ref that is successfully updated following the same format as the
<a href="#pre-receive"><em>pre-receive</em></a> hook.</p>
</div>
<div class="paragraph">
<p>This hook does not affect the outcome of <code>git</code> <code>receive-pack</code>, as it
is called after the real work is done.</p>
</div>
<div class="paragraph">
<p>This supersedes the <a href="#post-update"><em>post-update</em></a> hook in that it gets
both old and new values of all the refs in addition to their
names.</p>
</div>
<div class="paragraph">
<p>Both standard output and standard error output are forwarded to
<code>git</code> <code>send-pack</code> on the other end, so you can simply <code>echo</code> messages
for the user.</p>
</div>
<div class="paragraph">
<p>The default <em>post-receive</em> hook is empty, but there is
a sample script <code>post-receive-email</code> provided in the <code>contrib/hooks</code>
directory in Git distribution, which implements sending commit
emails.</p>
</div>
<div class="paragraph">
<p>The number of push options given on the command line of
<code>git</code> <code>push</code> <code>--push-option=..</code>. can be read from the environment
variable <code>GIT_PUSH_OPTION_COUNT</code>, and the options themselves are
found in <code>GIT_PUSH_OPTION_0</code>, <code>GIT_PUSH_OPTION_1</code>,&#8230;&#8203;
If it is negotiated to not use the push options phase, the
environment variables will not be set. If the client selects
to use push options, but doesn&#8217;t transmit any, the count variable
will be set to zero, <code>GIT_PUSH_OPTION_COUNT=0</code>.</p>
</div>
<div class="paragraph">
<p>See the "post-receive" section in <a href="git-receive-pack.html">git-receive-pack(1)</a> for
additional details.</p>
</div>
</div>
<div class="sect2">
<h3 id="post-update">post-update</h3>
<div class="paragraph">
<p>This hook is invoked by <a href="git-receive-pack.html">git-receive-pack(1)</a> when it reacts to
<code>git</code> <code>push</code> and updates reference(s) in its repository.
It executes on the remote repository once after all the refs have
been updated.</p>
</div>
<div class="paragraph">
<p>It takes a variable number of parameters, each of which is the
name of ref that was actually updated.</p>
</div>
<div class="paragraph">
<p>This hook is meant primarily for notification, and cannot affect
the outcome of <code>git</code> <code>receive-pack</code>.</p>
</div>
<div class="paragraph">
<p>The <em>post-update</em> hook can tell what are the heads that were pushed,
but it does not know what their original and updated values are,
so it is a poor place to do log old..new. The
<a href="#post-receive"><em>post-receive</em></a> hook does get both original and
updated values of the refs. You might consider it instead if you need
them.</p>
</div>
<div class="paragraph">
<p>When enabled, the default <em>post-update</em> hook runs
<code>git</code> <code>update-server-info</code> to keep the information used by dumb
transports (e.g., HTTP) up to date. If you are publishing
a Git repository that is accessible via HTTP, you should
probably enable this hook.</p>
</div>
<div class="paragraph">
<p>Both standard output and standard error output are forwarded to
<code>git</code> <code>send-pack</code> on the other end, so you can simply <code>echo</code> messages
for the user.</p>
</div>
</div>
<div class="sect2">
<h3 id="_reference_transaction">reference-transaction</h3>
<div class="paragraph">
<p>This hook is invoked by any Git command that performs reference
updates. It executes whenever a reference transaction is prepared,
committed or aborted and may thus get called multiple times. The hook
also supports symbolic reference updates.</p>
</div>
<div class="paragraph">
<p>The hook takes exactly one argument, which is the current state the
given reference transaction is in:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>"prepared": All reference updates have been queued to the
transaction and references were locked on disk.</p>
</li>
<li>
<p>"committed": The reference transaction was committed and all
references now have their respective new value.</p>
</li>
<li>
<p>"aborted": The reference transaction was aborted, no changes
were performed and the locks have been released.</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>For each reference update that was added to the transaction, the hook
receives on standard input a line of the format:</p>
</div>
<div class="literalblock">
<div class="content">
<pre>&lt;old-value&gt; SP &lt;new-value&gt; SP &lt;ref-name&gt; LF</pre>
</div>
</div>
<div class="paragraph">
<p>where <em>&lt;old-value&gt;</em> is the old object name passed into the reference
transaction, <em>&lt;new-value&gt;</em> is the new object name to be stored in the
ref and <em>&lt;ref-name&gt;</em> is the full name of the ref. When force updating
the reference regardless of its current value or when the reference is
to be created anew, <em>&lt;old-value&gt;</em> is the all-zeroes object name. To
distinguish these cases, you can inspect the current value of
<em>&lt;ref-name&gt;</em> via <code>git</code> <code>rev-parse</code>.</p>
</div>
<div class="paragraph">
<p>For symbolic reference updates the &lt;old_value&gt; and <em>&lt;new-value&gt;</em>
fields could denote references instead of objects. A reference will be
denoted with a <em>ref:</em> prefix, like <code>ref:</code><em>&lt;ref-target&gt;</em>.</p>
</div>
<div class="paragraph">
<p>The exit status of the hook is ignored for any state except for the
"prepared" state. In the "prepared" state, a non-zero exit status will
cause the transaction to be aborted. The hook will not be called with
"aborted" state in that case.</p>
</div>
</div>
<div class="sect2">
<h3 id="_push_to_checkout">push-to-checkout</h3>
<div class="paragraph">
<p>This hook is invoked by <a href="git-receive-pack.html">git-receive-pack(1)</a> when it reacts to
<code>git</code> <code>push</code> and updates reference(s) in its repository, and when
the push tries to update the branch that is currently checked out
and the <code>receive.denyCurrentBranch</code> configuration variable is set to
<code>updateInstead</code>. Such a push by default is refused if the working
tree and the index of the remote repository has any difference from
the currently checked out commit; when both the working tree and the
index match the current commit, they are updated to match the newly
pushed tip of the branch. This hook is to be used to override the
default behaviour.</p>
</div>
<div class="paragraph">
<p>The hook receives the commit with which the tip of the current
branch is going to be updated. It can exit with a non-zero status
to refuse the push (when it does so, it must not modify the index or
the working tree). Or it can make any necessary changes to the
working tree and to the index to bring them to the desired state
when the tip of the current branch is updated to the new commit, and
exit with a zero status.</p>
</div>
<div class="paragraph">
<p>For example, the hook can simply run <code>git</code> <code>read-tree</code> <code>-u</code> <code>-m</code> <code>HEAD</code> "$1"
in order to emulate <code>git</code> <code>fetch</code> that is run in the reverse direction
with <code>git</code> <code>push</code>, as the two-tree form of <code>git</code> <code>read-tree</code> <code>-u</code> <code>-m</code> is
essentially the same as <code>git</code> <code>switch</code> or <code>git</code> <code>checkout</code>
that switches branches while
keeping the local changes in the working tree that do not interfere
with the difference between the branches.</p>
</div>
</div>
<div class="sect2">
<h3 id="_pre_auto_gc">pre-auto-gc</h3>
<div class="paragraph">
<p>This hook is invoked by <code>git</code> <code>gc</code> <code>--auto</code> (see <a href="git-gc.html">git-gc(1)</a>). It
takes no parameter, and exiting with non-zero status from this script
causes the <code>git</code> <code>gc</code> <code>--auto</code> to abort.</p>
</div>
</div>
<div class="sect2">
<h3 id="_post_rewrite">post-rewrite</h3>
<div class="paragraph">
<p>This hook is invoked by commands that rewrite commits
(<a href="git-commit.html">git-commit(1)</a> when called with <code>--amend</code> and
<a href="git-rebase.html">git-rebase(1)</a>; however, full-history (re)writing tools like
<a href="git-fast-import.html">git-fast-import(1)</a> or
<a href="https://github.com/newren/git-filter-repo">git-filter-repo</a> typically
do not call it!). Its first argument denotes the command it was
invoked by: currently one of <code>amend</code> or <code>rebase</code>. Further
command-dependent arguments may be passed in the future.</p>
</div>
<div class="paragraph">
<p>The hook receives a list of the rewritten commits on stdin, in the
format</p>
</div>
<div class="literalblock">
<div class="content">
<pre>&lt;old-object-name&gt; SP &lt;new-object-name&gt; [ SP &lt;extra-info&gt; ] LF</pre>
</div>
</div>
<div class="paragraph">
<p>The <em>extra-info</em> is again command-dependent. If it is empty, the
preceding SP is also omitted. Currently, no commands pass any
<em>extra-info</em>.</p>
</div>
<div class="paragraph">
<p>The hook always runs after the automatic note copying (see
"notes.rewrite.&lt;command&gt;" in <a href="git-config.html">git-config(1)</a>) has happened, and
thus has access to these notes.</p>
</div>
<div class="paragraph">
<p>The following command-specific comments apply:</p>
</div>
<div class="dlist">
<dl>
<dt class="hdlist1">rebase</dt>
<dd>
<p>For the <em>squash</em> and <em>fixup</em> operation, all commits that were
squashed are listed as being rewritten to the squashed commit.
This means that there will be several lines sharing the same
<em>new-object-name</em>.</p>
<div class="paragraph">
<p>The commits are guaranteed to be listed in the order that they were
processed by rebase.</p>
</div>
</dd>
</dl>
</div>
</div>
<div class="sect2">
<h3 id="_sendemail_validate">sendemail-validate</h3>
<div class="paragraph">
<p>This hook is invoked by <a href="git-send-email.html">git-send-email(1)</a>.</p>
</div>
<div class="paragraph">
<p>It takes these command line arguments. They are,
1. the name of the file which holds the contents of the email to be sent.
2. The name of the file which holds the SMTP headers of the email.</p>
</div>
<div class="paragraph">
<p>The SMTP headers are passed in the exact same way as they are passed to the
user&#8217;s Mail Transport Agent (MTA). In effect, the email given to the user&#8217;s
MTA, is the contents of $2 followed by the contents of $1.</p>
</div>
<div class="paragraph">
<p>An example of a few common headers is shown below. Take notice of the
capitalization and multi-line tab structure.</p>
</div>
<div class="literalblock">
<div class="content">
<pre>From: Example &lt;from@example.com&gt;
To: to@example.com
Cc: cc@example.com,
A &lt;author@example.com&gt;,
One &lt;one@example.com&gt;,
two@example.com
Subject: PATCH-STRING</pre>
</div>
</div>
<div class="paragraph">
<p>Exiting with a non-zero status causes <code>git</code> <code>send-email</code> to abort
before sending any e-mails.</p>
</div>
<div class="paragraph">
<p>The following environment variables are set when executing the hook.</p>
</div>
<div class="dlist">
<dl>
<dt class="hdlist1"><code>GIT_SENDEMAIL_FILE_COUNTER</code></dt>
<dd>
<p>A 1-based counter incremented by one for every file holding an e-mail
to be sent (excluding any FIFOs). This counter does not follow the
patch series counter scheme. It will always start at 1 and will end at
GIT_SENDEMAIL_FILE_TOTAL.</p>
</dd>
<dt class="hdlist1"><code>GIT_SENDEMAIL_FILE_TOTAL</code></dt>
<dd>
<p>The total number of files that will be sent (excluding any FIFOs). This
counter does not follow the patch series counter scheme. It will always
be equal to the number of files being sent, whether there is a cover
letter or not.</p>
</dd>
</dl>
</div>
<div class="paragraph">
<p>These variables may for instance be used to validate patch series.</p>
</div>
<div class="paragraph">
<p>The sample <code>sendemail-validate</code> hook that comes with Git checks that all sent
patches (excluding the cover letter) can be applied on top of the upstream
repository default branch without conflicts. Some placeholders are left for
additional validation steps to be performed after all patches of a given series
have been applied.</p>
</div>
</div>
<div class="sect2">
<h3 id="_fsmonitor_watchman">fsmonitor-watchman</h3>
<div class="paragraph">
<p>This hook is invoked when the configuration option <code>core.fsmonitor</code> is
set to .<code>git/hooks/fsmonitor-watchman</code> or .<code>git/hooks/fsmonitor-watchmanv2</code>
depending on the version of the hook to use.</p>
</div>
<div class="paragraph">
<p>Version 1 takes two arguments, a version (1) and the time in elapsed
nanoseconds since midnight, January 1, 1970.</p>
</div>
<div class="paragraph">
<p>Version 2 takes two arguments, a version (2) and a token that is used
for identifying changes since the token. For watchman this would be
a clock id. This version must output to stdout the new token followed
by a NUL before the list of files.</p>
</div>
<div class="paragraph">
<p>The hook should output to stdout the list of all files in the working
directory that may have changed since the requested time. The logic
should be inclusive so that it does not miss any potential changes.
The paths should be relative to the root of the working directory
and be separated by a single NUL.</p>
</div>
<div class="paragraph">
<p>It is OK to include files which have not actually changed. All changes
including newly-created and deleted files should be included. When
files are renamed, both the old and the new name should be included.</p>
</div>
<div class="paragraph">
<p>Git will limit what files it checks for changes as well as which
directories are checked for untracked files based on the path names
given.</p>
</div>
<div class="paragraph">
<p>An optimized way to tell git "all files have changed" is to return
the filename <code>/</code>.</p>
</div>
<div class="paragraph">
<p>The exit status determines whether git will use the data from the
hook to limit its search. On error, it will fall back to verifying
all files and folders.</p>
</div>
</div>
<div class="sect2">
<h3 id="_p4_changelist">p4-changelist</h3>
<div class="paragraph">
<p>This hook is invoked by <code>git-p4</code> <code>submit</code>.</p>
</div>
<div class="paragraph">
<p>The <code>p4-changelist</code> hook is executed after the changelist
message has been edited by the user. It can be bypassed with the
<code>--no-verify</code> option. It takes a single parameter, the name
of the file that holds the proposed changelist text. Exiting
with a non-zero status causes the command to abort.</p>
</div>
<div class="paragraph">
<p>The hook is allowed to edit the changelist file and can be used
to normalize the text into some project standard format. It can
also be used to refuse the Submit after inspect the message file.</p>
</div>
<div class="paragraph">
<p>Run <code>git-p4</code> <code>submit</code> <code>--help</code> for details.</p>
</div>
</div>
<div class="sect2">
<h3 id="_p4_prepare_changelist">p4-prepare-changelist</h3>
<div class="paragraph">
<p>This hook is invoked by <code>git-p4</code> <code>submit</code>.</p>
</div>
<div class="paragraph">
<p>The <code>p4-prepare-changelist</code> hook is executed right after preparing
the default changelist message and before the editor is started.
It takes one parameter, the name of the file that contains the
changelist text. Exiting with a non-zero status from the script
will abort the process.</p>
</div>
<div class="paragraph">
<p>The purpose of the hook is to edit the message file in place,
and it is not suppressed by the <code>--no-verify</code> option. This hook
is called even if <code>--prepare-p4-only</code> is set.</p>
</div>
<div class="paragraph">
<p>Run <code>git-p4</code> <code>submit</code> <code>--help</code> for details.</p>
</div>
</div>
<div class="sect2">
<h3 id="_p4_post_changelist">p4-post-changelist</h3>
<div class="paragraph">
<p>This hook is invoked by <code>git-p4</code> <code>submit</code>.</p>
</div>
<div class="paragraph">
<p>The <code>p4-post-changelist</code> hook is invoked after the submit has
successfully occurred in P4. It takes no parameters and is meant
primarily for notification and cannot affect the outcome of the
git p4 submit action.</p>
</div>
<div class="paragraph">
<p>Run <code>git-p4</code> <code>submit</code> <code>--help</code> for details.</p>
</div>
</div>
<div class="sect2">
<h3 id="_p4_pre_submit">p4-pre-submit</h3>
<div class="paragraph">
<p>This hook is invoked by <code>git-p4</code> <code>submit</code>. It takes no parameters and nothing
from standard input. Exiting with non-zero status from this script prevent
<code>git-p4</code> <code>submit</code> from launching. It can be bypassed with the <code>--no-verify</code>
command line option. Run <code>git-p4</code> <code>submit</code> <code>--help</code> for details.</p>
</div>
</div>
<div class="sect2">
<h3 id="_post_index_change">post-index-change</h3>
<div class="paragraph">
<p>This hook is invoked when the index is written in read-cache.c
do_write_locked_index.</p>
</div>
<div class="paragraph">
<p>The first parameter passed to the hook is the indicator for the
working directory being updated. "1" meaning working directory
was updated or "0" when the working directory was not updated.</p>
</div>
<div class="paragraph">
<p>The second parameter passed to the hook is the indicator for whether
or not the index was updated and the skip-worktree bit could have
changed. "1" meaning skip-worktree bits could have been updated
and "0" meaning they were not.</p>
</div>
<div class="paragraph">
<p>Only one parameter should be set to "1" when the hook runs. The hook
running passing "1", "1" should not be possible.</p>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_see_also">SEE ALSO</h2>
<div class="sectionbody">
<div class="paragraph">
<p><a href="git-hook.html">git-hook(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>
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Last updated 2025-06-20 18:10:42 -0700
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