Hooks are little scripts you can place in `$GIT_DIR/hooks`
directory to trigger action at certain points. When
-'git-init' is run, a handful example hooks are copied in the
+'git init' is run, a handful of example hooks are copied into the
`hooks` directory of the new repository, but by default they are
all disabled. To enable a hook, rename it by removing its `.sample`
suffix.
+NOTE: It is also a requirement for a given hook to be executable.
+However - in a freshly initialized repository - the `.sample` files are
+executable by default.
+
This document describes the currently defined hooks.
+HOOKS
+-----
+
applypatch-msg
---------------
+~~~~~~~~~~~~~~
-This hook is invoked by 'git-am' script. It takes a single
+This hook is invoked by 'git am' script. It takes a single
parameter, the name of the file that holds the proposed commit
log message. Exiting with non-zero status causes
-'git-am' to abort before applying the patch.
+'git am' to abort before applying the patch.
The hook is allowed to edit the message file in place, and can
be used to normalize the message into some project standard
'commit-msg' hook, if the latter is enabled.
pre-applypatch
---------------
+~~~~~~~~~~~~~~
-This hook is invoked by 'git-am'. It takes no parameter, and is
+This hook is invoked by 'git am'. It takes no parameter, and is
invoked after the patch is applied, but before a commit is made.
If it exits with non-zero status, then the working tree will not be
'pre-commit' hook, if the latter is enabled.
post-applypatch
----------------
+~~~~~~~~~~~~~~~
-This hook is invoked by 'git-am'. It takes no parameter,
+This hook is invoked by 'git am'. It takes no parameter,
and is invoked after the patch is applied and a commit is made.
This hook is meant primarily for notification, and cannot affect
-the outcome of 'git-am'.
+the outcome of 'git am'.
pre-commit
-----------
+~~~~~~~~~~
-This hook is invoked by 'git-commit', and can be bypassed
+This hook is invoked by 'git commit', and can be bypassed
with `\--no-verify` option. It takes no parameter, and is
invoked before obtaining the proposed commit log message and
making a commit. Exiting with non-zero status from this script
-causes the 'git-commit' to abort.
+causes the 'git commit' to abort.
The default 'pre-commit' hook, when enabled, catches introduction
of lines with trailing whitespaces and aborts the commit when
such a line is found.
-All the 'git-commit' hooks are invoked with the environment
+All the 'git commit' hooks are invoked with the environment
variable `GIT_EDITOR=:` if the command will not bring up an editor
to modify the commit message.
prepare-commit-msg
-------------------
+~~~~~~~~~~~~~~~~~~
-This hook is invoked by 'git-commit' right after preparing the
+This hook is invoked by 'git commit' right after preparing the
default log message, and before the editor is started.
It takes one to three parameters. The first is the name of the file
-that the commit log message. The second is the source of the commit
-message, and can be: `message` (if a `\-m` or `\-F` option was
-given); `template` (if a `\-t` option was given or the
+that contains the commit log message. The second is the source of the commit
+message, and can be: `message` (if a `-m` or `-F` option was
+given); `template` (if a `-t` option was given or the
configuration option `commit.template` is set); `merge` (if the
commit is a merge or a `.git/MERGE_MSG` file exists); `squash`
(if a `.git/SQUASH_MSG` file exists); or `commit`, followed by
-a commit SHA1 (if a `\-c`, `\-C` or `\--amend` option was given).
+a commit SHA1 (if a `-c`, `-C` or `\--amend` option was given).
-If the exit status is non-zero, 'git-commit' will abort.
+If the exit status is non-zero, 'git commit' will abort.
The purpose of the hook is to edit the message file in place, and
it is not suppressed by the `\--no-verify` option. A non-zero exit
out the `Conflicts:` part of a merge's commit message.
commit-msg
-----------
+~~~~~~~~~~
-This hook is invoked by 'git-commit', and can be bypassed
+This hook is invoked by 'git commit', and can be bypassed
with `\--no-verify` option. It takes a single parameter, the
name of the file that holds the proposed commit log message.
-Exiting with non-zero status causes the 'git-commit' to
+Exiting with non-zero status causes the 'git commit' to
abort.
The hook is allowed to edit the message file in place, and can
"Signed-off-by" lines, and aborts the commit if one is found.
post-commit
------------
+~~~~~~~~~~~
-This hook is invoked by 'git-commit'. It takes no
+This hook is invoked by 'git commit'. It takes no
parameter, and is invoked after a commit is made.
This hook is meant primarily for notification, and cannot affect
-the outcome of 'git-commit'.
+the outcome of 'git commit'.
+
+pre-rebase
+~~~~~~~~~~
+
+This hook is called by 'git rebase' and can be used to prevent a branch
+from getting rebased.
+
post-checkout
------------
+~~~~~~~~~~~~~
-This hook is invoked when a 'git-checkout' is run after having updated the
+This hook is invoked when a 'git checkout' 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 'git-checkout'.
+This hook cannot affect the outcome of 'git checkout'.
+
+It is also run after 'git clone', unless the --no-checkout (-n) 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.
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.
post-merge
------------
+~~~~~~~~~~
-This hook is invoked by 'git-merge', which happens when a 'git-pull'
+This hook is invoked by 'git merge', which happens when a 'git pull'
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 'git-merge' and is not executed,
+This hook cannot affect the outcome of 'git merge' and is not executed,
if the merge failed due to conflicts.
This hook can be used in conjunction with a corresponding pre-commit hook to
[[pre-receive]]
pre-receive
------------
+~~~~~~~~~~~
This hook is invoked by 'git-receive-pack' on the remote repository,
-which happens when a 'git-push' is done on a local repository.
+which happens when a 'git push' is done on a local 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.
still be prevented by the <<update,'update'>> hook.
Both standard output and standard error output are forwarded to
-'git-send-pack' on the other end, so you can simply `echo` messages
+'git send-pack' on the other end, so you can simply `echo` messages
for the user.
[[update]]
update
-------
+~~~~~~
This hook is invoked by 'git-receive-pack' on the remote repository,
-which happens when a 'git-push' is done on a local repository.
+which happens when a 'git push' is done on a local 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.
This hook can be used to prevent 'forced' 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.
+That is, to enforce a "fast-forward only" policy.
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
based on filesystem group.
Both standard output and standard error output are forwarded to
-'git-send-pack' on the other end, so you can simply `echo` messages
+'git send-pack' on the other end, so you can simply `echo` messages
for the user.
The default 'update' hook, when enabled--and with
-`hooks.allowunannotated` config option turned on--prevents
+`hooks.allowunannotated` config option unset or set to false--prevents
unannotated tags to be pushed.
[[post-receive]]
post-receive
-------------
+~~~~~~~~~~~~
This hook is invoked by 'git-receive-pack' on the remote repository,
-which happens when a 'git-push' is done on a local repository.
+which happens when a 'git push' is done on a local repository.
It executes on the remote repository once after all the refs have
been updated.
names.
Both standard output and standard error output are forwarded to
-'git-send-pack' on the other end, so you can simply `echo` messages
+'git send-pack' on the other end, so you can simply `echo` messages
for the user.
The default 'post-receive' hook is empty, but there is
[[post-update]]
post-update
------------
+~~~~~~~~~~~
This hook is invoked by 'git-receive-pack' on the remote repository,
-which happens when a 'git-push' is done on a local repository.
+which happens when a 'git push' is done on a local repository.
It executes on the remote repository once after all the refs have
been updated.
them.
When enabled, the default 'post-update' hook runs
-'git-update-server-info' to keep the information used by dumb
+'git update-server-info' 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.
Both standard output and standard error output are forwarded to
-'git-send-pack' on the other end, so you can simply `echo` messages
+'git send-pack' on the other end, so you can simply `echo` messages
for the user.
pre-auto-gc
------------
+~~~~~~~~~~~
-This hook is invoked by 'git-gc --auto'. It takes no parameter, and
-exiting with non-zero status from this script causes the 'git-gc --auto'
+This hook is invoked by 'git gc --auto'. It takes no parameter, and
+exiting with non-zero status from this script causes the 'git gc --auto'
to abort.
+post-rewrite
+~~~~~~~~~~~~
+
+This hook is invoked by commands that rewrite commits (`git commit
+--amend`, 'git-rebase'; currently 'git-filter-branch' does 'not' call
+it!). Its first argument denotes the command it was invoked by:
+currently one of `amend` or `rebase`. Further command-dependent
+arguments may be passed in the future.
+
+The hook receives a list of the rewritten commits on stdin, in the
+format
+
+ <old-sha1> SP <new-sha1> [ SP <extra-info> ] LF
+
+The 'extra-info' is again command-dependent. If it is empty, the
+preceding SP is also omitted. Currently, no commands pass any
+'extra-info'.
+
+The hook always runs after the automatic note copying (see
+"notes.rewrite.<command>" in linkgit:git-config.txt) has happened, and
+thus has access to these notes.
+
+The following command-specific comments apply:
+
+rebase::
+ For the 'squash' and 'fixup' 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
+ 'new-sha1'.
++
+The commits are guaranteed to be listed in the order that they were
+processed by rebase.
+
+
GIT
---
Part of the linkgit:git[1] suite