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![Junio C Hamano](/assets/img/avatar_default.png)
We used to mark hooks we ship as samples by making them unexecutable, but some filesystems cannot tell what is executable and what is not. This makes it much more explicit. The hooks are suffixed with .sample (but now are made executable), so enabling it is still one step operation (instead of "chmod +x $hook", you would do "mv $hook.sample $hook") but now they won't get accidentally enabled on systems without executable bit. Signed-off-by: Junio C Hamano <gitster@pobox.com>
305 lines
10 KiB
Plaintext
305 lines
10 KiB
Plaintext
githooks(5)
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===========
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NAME
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----
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githooks - Hooks used by git
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SYNOPSIS
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--------
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$GIT_DIR/hooks/*
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DESCRIPTION
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-----------
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Hooks are little scripts you can place in `$GIT_DIR/hooks`
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directory to trigger action at certain points. When
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`git-init` is run, a handful example hooks are copied in the
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`hooks` directory of the new repository, but by default they are
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all disabled. To enable a hook, rename it by removing its `.sample`
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suffix.
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This document describes the currently defined hooks.
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applypatch-msg
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--------------
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This hook is invoked by `git-am` script. It takes a single
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parameter, the name of the file that holds the proposed commit
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log message. Exiting with non-zero status causes
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`git-am` to abort before applying the patch.
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The hook is allowed to edit the message file in place, and can
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be used to normalize the message into some project standard
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format (if the project has one). It can also be used to refuse
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the commit after inspecting the message file.
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The default 'applypatch-msg' hook, when enabled, runs the
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'commit-msg' hook, if the latter is enabled.
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pre-applypatch
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--------------
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This hook is invoked by `git-am`. It takes no parameter, and is
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invoked after the patch is applied, but before a commit is made.
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If it exits with non-zero status, then the working tree will not be
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committed after applying the patch.
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It can be used to inspect the current working tree and refuse to
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make a commit if it does not pass certain test.
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The default 'pre-applypatch' hook, when enabled, runs the
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'pre-commit' hook, if the latter is enabled.
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post-applypatch
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---------------
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This hook is invoked by `git-am`. It takes no parameter,
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and is invoked after the patch is applied and a commit is made.
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This hook is meant primarily for notification, and cannot affect
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the outcome of `git-am`.
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pre-commit
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----------
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This hook is invoked by `git-commit`, and can be bypassed
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with `\--no-verify` option. It takes no parameter, and is
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invoked before obtaining the proposed commit log message and
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making a commit. Exiting with non-zero status from this script
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causes the `git-commit` to abort.
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The default 'pre-commit' hook, when enabled, catches introduction
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of lines with trailing whitespaces and aborts the commit when
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such a line is found.
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All the `git-commit` hooks are invoked with the environment
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variable `GIT_EDITOR=:` if the command will not bring up an editor
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to modify the commit message.
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prepare-commit-msg
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------------------
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This hook is invoked by `git-commit` right after preparing the
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default log message, and before the editor is started.
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It takes one to three parameters. The first is the name of the file
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that the commit log message. The second is the source of the commit
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message, and can be: `message` (if a `\-m` or `\-F` option was
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given); `template` (if a `\-t` option was given or the
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configuration option `commit.template` is set); `merge` (if the
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commit is a merge or a `.git/MERGE_MSG` file exists); `squash`
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(if a `.git/SQUASH_MSG` file exists); or `commit`, followed by
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a commit SHA1 (if a `\-c`, `\-C` or `\--amend` option was given).
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If the exit status is non-zero, `git-commit` will abort.
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The purpose of the hook is to edit the message file in place, and
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it is not suppressed by the `\--no-verify` option. A non-zero exit
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means a failure of the hook and aborts the commit. It should not
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be used as replacement for pre-commit hook.
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The sample `prepare-commit-msg` hook that comes with git comments
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out the `Conflicts:` part of a merge's commit message.
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commit-msg
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----------
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This hook is invoked by `git-commit`, and can be bypassed
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with `\--no-verify` option. It takes a single parameter, the
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name of the file that holds the proposed commit log message.
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Exiting with non-zero status causes the `git-commit` to
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abort.
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The hook is allowed to edit the message file in place, and can
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be used to normalize the message into some project standard
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format (if the project has one). It can also be used to refuse
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the commit after inspecting the message file.
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The default 'commit-msg' hook, when enabled, detects duplicate
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"Signed-off-by" lines, and aborts the commit if one is found.
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post-commit
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-----------
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This hook is invoked by `git-commit`. It takes no
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parameter, and is invoked after a commit is made.
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This hook is meant primarily for notification, and cannot affect
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the outcome of `git-commit`.
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post-checkout
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-----------
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This hook is invoked when a `git-checkout` is run after having updated the
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worktree. The hook is given three parameters: the ref of the previous HEAD,
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the ref of the new HEAD (which may or may not have changed), and a flag
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indicating whether the checkout was a branch checkout (changing branches,
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flag=1) or a file checkout (retrieving a file from the index, flag=0).
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This hook cannot affect the outcome of `git-checkout`.
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This hook can be used to perform repository validity checks, auto-display
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differences from the previous HEAD if different, or set working dir metadata
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properties.
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post-merge
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-----------
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This hook is invoked by `git-merge`, which happens when a `git pull`
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is done on a local repository. The hook takes a single parameter, a status
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flag specifying whether or not the merge being done was a squash merge.
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This hook cannot affect the outcome of `git-merge` and is not executed,
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if the merge failed due to conflicts.
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This hook can be used in conjunction with a corresponding pre-commit hook to
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save and restore any form of metadata associated with the working tree
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(eg: permissions/ownership, ACLS, etc). See contrib/hooks/setgitperms.perl
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for an example of how to do this.
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[[pre-receive]]
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pre-receive
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-----------
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This hook is invoked by `git-receive-pack` on the remote repository,
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which happens when a `git push` is done on a local repository.
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Just before starting to update refs on the remote repository, the
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pre-receive hook is invoked. Its exit status determines the success
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or failure of the update.
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This hook executes once for the receive operation. It takes no
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arguments, but for each ref to be updated it receives on standard
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input a line of the format:
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<old-value> SP <new-value> SP <ref-name> LF
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where `<old-value>` is the old object name stored in the ref,
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`<new-value>` is the new object name to be stored in the ref and
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`<ref-name>` is the full name of the ref.
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When creating a new ref, `<old-value>` is 40 `0`.
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If the hook exits with non-zero status, none of the refs will be
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updated. If the hook exits with zero, updating of individual refs can
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still be prevented by the <<update,'update'>> hook.
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Both standard output and standard error output are forwarded to
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`git-send-pack` on the other end, so you can simply `echo` messages
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for the user.
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[[update]]
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update
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------
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This hook is invoked by `git-receive-pack` on the remote repository,
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which happens when a `git push` is done on a local repository.
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Just before updating the ref on the remote repository, the update hook
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is invoked. Its exit status determines the success or failure of
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the ref update.
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The hook executes once for each ref to be updated, and takes
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three parameters:
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- the name of the ref being updated,
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- the old object name stored in the ref,
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- and the new objectname to be stored in the ref.
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A zero exit from the update hook allows the ref to be updated.
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Exiting with a non-zero status prevents `git-receive-pack`
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from updating that ref.
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This hook can be used to prevent 'forced' update on certain refs by
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making sure that the object name is a commit object that is a
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descendant of the commit object named by the old object name.
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That is, to enforce a "fast forward only" policy.
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It could also be used to log the old..new status. However, it
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does not know the entire set of branches, so it would end up
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firing one e-mail per ref when used naively, though. The
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<<post-receive,'post-receive'>> hook is more suited to that.
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Another use suggested on the mailing list is to use this hook to
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implement access control which is finer grained than the one
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based on filesystem group.
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Both standard output and standard error output are forwarded to
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`git-send-pack` on the other end, so you can simply `echo` messages
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for the user.
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The default 'update' hook, when enabled--and with
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`hooks.allowunannotated` config option turned on--prevents
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unannotated tags to be pushed.
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[[post-receive]]
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post-receive
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------------
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This hook is invoked by `git-receive-pack` on the remote repository,
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which happens when a `git push` is done on a local repository.
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It executes on the remote repository once after all the refs have
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been updated.
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This hook executes once for the receive operation. It takes no
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arguments, but gets the same information as the
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<<pre-receive,'pre-receive'>>
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hook does on its standard input.
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This hook does not affect the outcome of `git-receive-pack`, as it
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is called after the real work is done.
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This supersedes the <<post-update,'post-update'>> hook in that it gets
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both old and new values of all the refs in addition to their
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names.
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Both standard output and standard error output are forwarded to
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`git-send-pack` on the other end, so you can simply `echo` messages
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for the user.
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The default 'post-receive' hook is empty, but there is
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a sample script `post-receive-email` provided in the `contrib/hooks`
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directory in git distribution, which implements sending commit
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emails.
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[[post-update]]
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post-update
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-----------
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This hook is invoked by `git-receive-pack` on the remote repository,
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which happens when a `git push` is done on a local repository.
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It executes on the remote repository once after all the refs have
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been updated.
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It takes a variable number of parameters, each of which is the
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name of ref that was actually updated.
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This hook is meant primarily for notification, and cannot affect
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the outcome of `git-receive-pack`.
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The 'post-update' hook can tell what are the heads that were pushed,
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but it does not know what their original and updated values are,
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so it is a poor place to do log old..new. The
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<<post-receive,'post-receive'>> hook does get both original and
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updated values of the refs. You might consider it instead if you need
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them.
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When enabled, the default 'post-update' hook runs
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`git-update-server-info` to keep the information used by dumb
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transports (e.g., HTTP) up-to-date. If you are publishing
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a git repository that is accessible via HTTP, you should
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probably enable this hook.
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Both standard output and standard error output are forwarded to
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`git-send-pack` on the other end, so you can simply `echo` messages
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for the user.
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pre-auto-gc
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-----------
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This hook is invoked by `git-gc --auto`. It takes no parameter, and
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exiting with non-zero status from this script causes the `git-gc --auto`
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to abort.
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GIT
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---
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Part of the linkgit:git[1] suite
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