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cbb84e5d17
Added documentation of pre-receive and post-receive hooks and updated documentation of update and post-update hooks. [jc: with minor copy-editing] Signed-off-by: Jan Hudec <bulb@ucw.cz> Signed-off-by: Junio C Hamano <junkio@cox.net>
223 lines
7.9 KiB
Plaintext
223 lines
7.9 KiB
Plaintext
Hooks used by git
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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, make it executable with `chmod +x`.
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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-applypatch` script, which is
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typically invoked by `git-applymbox`. 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-applypatch` 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-applypatch` script, which is
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typically invoked by `git-applymbox`. It takes no parameter,
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and is invoked after the patch is applied, but before a commit
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is made. Exiting with non-zero status causes the working tree
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after application of the patch not committed.
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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-applypatch` script, which is
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typically invoked by `git-applymbox`. 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-applypatch`.
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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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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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[[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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If you want to report something to the `git-send-pack` on the other end,
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you can simply `echo` your messages.
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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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The standard output of this hook is sent to `stderr`, so if you
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want to report something to the `git-send-pack` on the other end,
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you can simply `echo` your messages.
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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 `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]] hook in that it actually get's
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both old and new values of all the refs.
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If you want to report something to the `git-send-pack` on the
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other end, you can simply `echo` your messages.
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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.
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In general, `post-receive` hook is preferred when the hook needs
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to decide its acion on the status of the entire set of refs
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being updated, as this hook is called once per ref, with
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information only on a single ref at a time.
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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.
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