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Linux 2.6 - man page for githooks (linux section 5)

GITHOOKS(5)				    Git Manual				      GITHOOKS(5)

NAME
       githooks - Hooks used by Git

SYNOPSIS
       $GIT_DIR/hooks/*

DESCRIPTION
       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 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 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.

       The hook is allowed to edit the message file in place, and can be used to normalize the
       message into some project standard format (if the project has one). It can also be used to
       refuse the commit after inspecting the message file.

       The default applypatch-msg hook, when enabled, runs the commit-msg hook, if the latter is
       enabled.

   pre-applypatch
       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 committed after
       applying the patch.

       It can be used to inspect the current working tree and refuse to make a commit if it does
       not pass certain test.

       The default pre-applypatch hook, when enabled, runs the pre-commit hook, if the latter is
       enabled.

   post-applypatch
       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.

   pre-commit
       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.

       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 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 default log message, and
       before the editor is started.

       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: 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 SHA-1
       (if a -c, -C or --amend option was given).

       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 means a failure of the hook and aborts the commit.
       It should not be used as replacement for pre-commit hook.

       The sample prepare-commit-msg hook that comes with Git comments out the Conflicts: part of
       a merge's commit message.

   commit-msg
       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 abort.

       The hook is allowed to edit the message file in place, and can be used to normalize the
       message into some project standard format (if the project has one). It can also be used to
       refuse the commit after inspecting the message file.

       The default commit-msg hook, when enabled, detects duplicate "Signed-off-by" lines, and
       aborts the commit if one is found.

   post-commit
       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.

   pre-rebase
       This hook is called by git rebase 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.

   post-checkout
       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.

       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 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, if the merge failed due to conflicts.

       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 (eg: permissions/ownership,
       ACLS, etc). See contrib/hooks/setgitperms.perl for an example of how to do this.

   pre-push
       This hook is called by git push 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.

       Information about what is to be pushed is provided on the hook's standard input with lines
       of the form:

	   <local ref> SP <local sha1> SP <remote ref> SP <remote sha1> LF

       For instance, if the command git push origin master:foreign were run the hook would
       receive a line like the following:

	   refs/heads/master 67890 refs/heads/foreign 12345

       although the full, 40-character SHA-1s would be supplied. If the foreign ref does not yet
       exist the <remote SHA-1> will be 40 0. If a ref is to be deleted, the <local ref> will be
       supplied as (delete) and the <local SHA-1> will be 40 0. If the local commit was specified
       by something other than a name which could be expanded (such as HEAD~, or a SHA-1) it will
       be supplied as it was originally given.

       If this hook exits with a non-zero status, git push will abort without pushing anything.
       Information about why the push is rejected may be sent to the user by writing to standard
       error.

   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. 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.

       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:

	   <old-value> SP <new-value> SP <ref-name> LF

       where <old-value> is the old object name stored in the ref, <new-value> is the new object
       name to be stored in the ref and <ref-name> is the full name of the ref. When creating a
       new ref, <old-value> is 40 0.

       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 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 for the user.

   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. 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.

       The hook executes once for each ref to be updated, and takes three parameters:

       o   the name of the ref being updated,

       o   the old object name stored in the ref,

       o   and the new objectname to be stored in the ref.

       A zero exit from the update hook allows the ref to be updated. Exiting with a non-zero
       status prevents git-receive-pack from updating that ref.

       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.

       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
       post-receive hook is more suited to that.

       Another use suggested on the mailing list is to use this hook to implement access control
       which is finer grained than the one 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 for the user.

       The default update hook, when enabled--and with hooks.allowunannotated config option unset
       or set to false--prevents unannotated tags to be pushed.

   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. It executes on the remote repository once after
       all the refs have been updated.

       This hook executes once for the receive operation. It takes no arguments, but gets the
       same information as the pre-receive hook does on its standard input.

       This hook does not affect the outcome of git-receive-pack, as it is called after the real
       work is done.

       This supersedes the post-update hook in that it gets both old and new values of all the
       refs in addition to their names.

       Both standard output and standard error output are forwarded to 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 a sample script post-receive-email
       provided in the contrib/hooks directory in Git distribution, which implements sending
       commit emails.

   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. It executes on the remote repository once after
       all the refs have been updated.

       It takes a variable number of parameters, each of which is the name of ref that was
       actually updated.

       This hook is meant primarily for notification, and cannot affect the outcome of
       git-receive-pack.

       The post-update 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
       post-receive hook does get both original and updated values of the refs. You might
       consider it instead if you need them.

       When enabled, the default post-update hook runs 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 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 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
       git-config.txt(1)) 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 git(1) suite

Git 1.8.5.3				    01/14/2014				      GITHOOKS(5)


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