git/Documentation/git-commit-tree.txt
Junio C Hamano 6694856153 commit-tree: do not pay attention to commit.gpgsign
ba3c69a9 (commit: teach --gpg-sign option, 2011-10-05) introduced a
"signed commit" by teaching the --[no]-gpg-sign option and the
commit.gpgsign configuration variable to various commands that
create commits.

Teaching these to "git commit" and "git merge", both of which are
end-user facing Porcelain commands, was perfectly fine.  Allowing
the plumbing "git commit-tree" to suddenly change the behaviour to
surprise the scripts by paying attention to commit.gpgsign was not.

Among the in-tree scripts, filter-branch, quiltimport, rebase and
stash are the commands that run "commit-tree".  If any of these
wants to allow users to always sign every single commit, they should
offer their own configuration (e.g. "filterBranch.gpgsign") with an
option to disable signing (e.g. "git filter-branch --no-gpgsign").

Ignoring commit.gpgsign option _obviously_ breaks the backward
compatibility, but it is easy to follow the standard pattern in
scripts to honor whatever configuration variable they choose to
follow.  E.g.

	case $(git config --bool commit.gpgsign) in
	true) sign=-S ;;
	*) sign= ;;
	esac &&
	git commit-tree $sign ...whatever other args...

Do so to make sure that "git rebase" keeps paying attention to the
configuration variable, which unfortunately is a documented mistake.

Helped-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2016-05-03 10:59:25 -07:00

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git-commit-tree(1)
==================
NAME
----
git-commit-tree - Create a new commit object
SYNOPSIS
--------
[verse]
'git commit-tree' <tree> [(-p <parent>)...] < changelog
'git commit-tree' [(-p <parent>)...] [-S[<keyid>]] [(-m <message>)...]
[(-F <file>)...] <tree>
DESCRIPTION
-----------
This is usually not what an end user wants to run directly. See
linkgit:git-commit[1] instead.
Creates a new commit object based on the provided tree object and
emits the new commit object id on stdout. The log message is read
from the standard input, unless `-m` or `-F` options are given.
A commit object may have any number of parents. With exactly one
parent, it is an ordinary commit. Having more than one parent makes
the commit a merge between several lines of history. Initial (root)
commits have no parents.
While a tree represents a particular directory state of a working
directory, a commit represents that state in "time", and explains how
to get there.
Normally a commit would identify a new "HEAD" state, and while Git
doesn't care where you save the note about that state, in practice we
tend to just write the result to the file that is pointed at by
`.git/HEAD`, so that we can always see what the last committed
state was.
OPTIONS
-------
<tree>::
An existing tree object
-p <parent>::
Each '-p' indicates the id of a parent commit object.
-m <message>::
A paragraph in the commit log message. This can be given more than
once and each <message> becomes its own paragraph.
-F <file>::
Read the commit log message from the given file. Use `-` to read
from the standard input.
-S[<keyid>]::
--gpg-sign[=<keyid>]::
GPG-sign commit.
--no-gpg-sign::
Do not GPG-sign commit, to countermand a `--gpg-sign` option
given earlier on the command line.
Commit Information
------------------
A commit encapsulates:
- all parent object ids
- author name, email and date
- committer name and email and the commit time.
While parent object ids are provided on the command line, author and
committer information is taken from the following environment variables,
if set:
GIT_AUTHOR_NAME
GIT_AUTHOR_EMAIL
GIT_AUTHOR_DATE
GIT_COMMITTER_NAME
GIT_COMMITTER_EMAIL
GIT_COMMITTER_DATE
(nb "<", ">" and "\n"s are stripped)
In case (some of) these environment variables are not set, the information
is taken from the configuration items user.name and user.email, or, if not
present, the environment variable EMAIL, or, if that is not set,
system user name and the hostname used for outgoing mail (taken
from `/etc/mailname` and falling back to the fully qualified hostname when
that file does not exist).
A commit comment is read from stdin. If a changelog
entry is not provided via "<" redirection, 'git commit-tree' will just wait
for one to be entered and terminated with ^D.
include::date-formats.txt[]
Discussion
----------
include::i18n.txt[]
FILES
-----
/etc/mailname
SEE ALSO
--------
linkgit:git-write-tree[1]
GIT
---
Part of the linkgit:git[1] suite