git/Documentation/git-commit.txt
Paolo Bonzini 8089c85bcb git-commit: add a prepare-commit-msg hook
The prepare-commit-msg hook is run whenever a "fresh" commit message
is prepared, just before it is shown in the editor (if it is).
Its purpose is to modify the commit message in-place.

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 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 as the third parameter (if a -c, -C or --amend option
was given).

If its exit status is non-zero, git-commit will abort.  The hook is
not suppressed by the --no-verify option, so it should not be used
as a replacement for the pre-commit hook.

The sample prepare-commit-msg comments out the `Conflicts:` part of
a merge's commit message; other examples are commented out, including
adding a Signed-off-by line at the bottom of the commit messsage,
that the user can then edit or discard altogether.

Signed-off-by: Paolo Bonzini <bonzini@gnu.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-02-06 02:26:55 -08:00

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git-commit(1)
=============
NAME
----
git-commit - Record changes to the repository
SYNOPSIS
--------
[verse]
'git-commit' [-a | --interactive] [-s] [-v] [-u]
[(-c | -C) <commit> | -F <file> | -m <msg> | --amend]
[--allow-empty] [--no-verify] [-e] [--author <author>]
[--cleanup=<mode>] [--] [[-i | -o ]<file>...]
DESCRIPTION
-----------
Use 'git commit' to store the current contents of the index in a new
commit along with a log message describing the changes you have made.
The content to be added can be specified in several ways:
1. by using linkgit:git-add[1] to incrementally "add" changes to the
index before using the 'commit' command (Note: even modified
files must be "added");
2. by using linkgit:git-rm[1] to remove files from the working tree
and the index, again before using the 'commit' command;
3. by listing files as arguments to the 'commit' command, in which
case the commit will ignore changes staged in the index, and instead
record the current content of the listed files;
4. by using the -a switch with the 'commit' command to automatically
"add" changes from all known files (i.e. all files that are already
listed in the index) and to automatically "rm" files in the index
that have been removed from the working tree, and then perform the
actual commit;
5. by using the --interactive switch with the 'commit' command to decide one
by one which files should be part of the commit, before finalizing the
operation. Currently, this is done by invoking `git-add --interactive`.
The linkgit:git-status[1] command can be used to obtain a
summary of what is included by any of the above for the next
commit by giving the same set of parameters you would give to
this command.
If you make a commit and then found a mistake immediately after
that, you can recover from it with linkgit:git-reset[1].
OPTIONS
-------
-a|--all::
Tell the command to automatically stage files that have
been modified and deleted, but new files you have not
told git about are not affected.
-c or -C <commit>::
Take existing commit object, and reuse the log message
and the authorship information (including the timestamp)
when creating the commit. With '-C', the editor is not
invoked; with '-c' the user can further edit the commit
message.
-F <file>::
Take the commit message from the given file. Use '-' to
read the message from the standard input.
--author <author>::
Override the author name used in the commit. Use
`A U Thor <author@example.com>` format.
-m <msg>|--message=<msg>::
Use the given <msg> as the commit message.
-t <file>|--template=<file>::
Use the contents of the given file as the initial version
of the commit message. The editor is invoked and you can
make subsequent changes. If a message is specified using
the `-m` or `-F` options, this option has no effect. This
overrides the `commit.template` configuration variable.
-s|--signoff::
Add Signed-off-by line at the end of the commit message.
--no-verify::
This option bypasses the pre-commit and commit-msg hooks.
See also link:hooks.html[hooks].
--allow-empty::
Usually recording a commit that has the exact same tree as its
sole parent commit is a mistake, and the command prevents you
from making such a commit. This option bypasses the safety, and
is primarily for use by foreign scm interface scripts.
--cleanup=<mode>::
This option sets how the commit message is cleaned up.
The '<mode>' can be one of 'verbatim', 'whitespace', 'strip',
and 'default'. The 'default' mode will strip leading and
trailing empty lines and #commentary from the commit message
only if the message is to be edited. Otherwise only whitespace
removed. The 'verbatim' mode does not change message at all,
'whitespace' removes just leading/trailing whitespace lines
and 'strip' removes both whitespace and commentary.
-e|--edit::
The message taken from file with `-F`, command line with
`-m`, and from file with `-C` are usually used as the
commit log message unmodified. This option lets you
further edit the message taken from these sources.
--amend::
Used to amend the tip of the current branch. Prepare the tree
object you would want to replace the latest commit as usual
(this includes the usual -i/-o and explicit paths), and the
commit log editor is seeded with the commit message from the
tip of the current branch. The commit you create replaces the
current tip -- if it was a merge, it will have the parents of
the current tip as parents -- so the current top commit is
discarded.
+
--
It is a rough equivalent for:
------
$ git reset --soft HEAD^
$ ... do something else to come up with the right tree ...
$ git commit -c ORIG_HEAD
------
but can be used to amend a merge commit.
--
-i|--include::
Before making a commit out of staged contents so far,
stage the contents of paths given on the command line
as well. This is usually not what you want unless you
are concluding a conflicted merge.
-u|--untracked-files::
Show all untracked files, also those in uninteresting
directories, in the "Untracked files:" section of commit
message template. Without this option only its name and
a trailing slash are displayed for each untracked
directory.
-v|--verbose::
Show unified diff between the HEAD commit and what
would be committed at the bottom of the commit message
template. Note that this diff output doesn't have its
lines prefixed with '#'.
-q|--quiet::
Suppress commit summary message.
\--::
Do not interpret any more arguments as options.
<file>...::
When files are given on the command line, the command
commits the contents of the named files, without
recording the changes already staged. The contents of
these files are also staged for the next commit on top
of what have been staged before.
EXAMPLES
--------
When recording your own work, the contents of modified files in
your working tree are temporarily stored to a staging area
called the "index" with linkgit:git-add[1]. A file can be
reverted back, only in the index but not in the working tree,
to that of the last commit with `git-reset HEAD -- <file>`,
which effectively reverts `git-add` and prevents the changes to
this file from participating in the next commit. After building
the state to be committed incrementally with these commands,
`git commit` (without any pathname parameter) is used to record what
has been staged so far. This is the most basic form of the
command. An example:
------------
$ edit hello.c
$ git rm goodbye.c
$ git add hello.c
$ git commit
------------
Instead of staging files after each individual change, you can
tell `git commit` to notice the changes to the files whose
contents are tracked in
your working tree and do corresponding `git add` and `git rm`
for you. That is, this example does the same as the earlier
example if there is no other change in your working tree:
------------
$ edit hello.c
$ rm goodbye.c
$ git commit -a
------------
The command `git commit -a` first looks at your working tree,
notices that you have modified hello.c and removed goodbye.c,
and performs necessary `git add` and `git rm` for you.
After staging changes to many files, you can alter the order the
changes are recorded in, by giving pathnames to `git commit`.
When pathnames are given, the command makes a commit that
only records the changes made to the named paths:
------------
$ edit hello.c hello.h
$ git add hello.c hello.h
$ edit Makefile
$ git commit Makefile
------------
This makes a commit that records the modification to `Makefile`.
The changes staged for `hello.c` and `hello.h` are not included
in the resulting commit. However, their changes are not lost --
they are still staged and merely held back. After the above
sequence, if you do:
------------
$ git commit
------------
this second commit would record the changes to `hello.c` and
`hello.h` as expected.
After a merge (initiated by either linkgit:git-merge[1] or
linkgit:git-pull[1]) stops because of conflicts, cleanly merged
paths are already staged to be committed for you, and paths that
conflicted are left in unmerged state. You would have to first
check which paths are conflicting with linkgit:git-status[1]
and after fixing them manually in your working tree, you would
stage the result as usual with linkgit:git-add[1]:
------------
$ git status | grep unmerged
unmerged: hello.c
$ edit hello.c
$ git add hello.c
------------
After resolving conflicts and staging the result, `git ls-files -u`
would stop mentioning the conflicted path. When you are done,
run `git commit` to finally record the merge:
------------
$ git commit
------------
As with the case to record your own changes, you can use `-a`
option to save typing. One difference is that during a merge
resolution, you cannot use `git commit` with pathnames to
alter the order the changes are committed, because the merge
should be recorded as a single commit. In fact, the command
refuses to run when given pathnames (but see `-i` option).
DISCUSSION
----------
Though not required, it's a good idea to begin the commit message
with a single short (less than 50 character) line summarizing the
change, followed by a blank line and then a more thorough description.
Tools that turn commits into email, for example, use the first line
on the Subject: line and the rest of the commit in the body.
include::i18n.txt[]
ENVIRONMENT AND CONFIGURATION VARIABLES
---------------------------------------
The editor used to edit the commit log message will be chosen from the
GIT_EDITOR environment variable, the core.editor configuration variable, the
VISUAL environment variable, or the EDITOR environment variable (in that
order).
HOOKS
-----
This command can run `commit-msg`, `prepare-commit-msg`, `pre-commit`,
and `post-commit` hooks. See link:hooks.html[hooks] for more
information.
SEE ALSO
--------
linkgit:git-add[1],
linkgit:git-rm[1],
linkgit:git-mv[1],
linkgit:git-merge[1],
linkgit:git-commit-tree[1]
Author
------
Written by Linus Torvalds <torvalds@osdl.org> and
Junio C Hamano <junkio@cox.net>
GIT
---
Part of the linkgit:git[7] suite