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git/Documentation/git-patch-id.txt
Jeff King 48bb914ed6 doc: drop author/documentation sections from most pages
The point of these sections is generally to:

  1. Give credit where it is due.

  2. Give the reader an idea of where to ask questions or
     file bug reports.

But they don't do a good job of either case. For (1), they
are out of date and incomplete. A much more accurate answer
can be gotten through shortlog or blame.  For (2), the
correct contact point is generally git@vger, and even if you
wanted to cc the contact point, the out-of-date and
incomplete fields mean you're likely sending to somebody
useless.

So let's drop the fields entirely from all manpages except
git(1) itself. We already point people to the mailing list
for bug reports there, and we can update the Authors section
to give credit to the major contributors and point to
shortlog and blame for more information.

Each page has a "This is part of git" footer, so people can
follow that to the main git manpage.
2011-03-11 10:59:16 -05:00

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git-patch-id(1)
===============
NAME
----
git-patch-id - Compute unique ID for a patch
SYNOPSIS
--------
'git patch-id' < <patch>
DESCRIPTION
-----------
A "patch ID" is nothing but a SHA1 of the diff associated with a patch, with
whitespace and line numbers ignored. As such, it's "reasonably stable", but at
the same time also reasonably unique, i.e., two patches that have the same "patch
ID" are almost guaranteed to be the same thing.
IOW, you can use this thing to look for likely duplicate commits.
When dealing with 'git diff-tree' output, it takes advantage of
the fact that the patch is prefixed with the object name of the
commit, and outputs two 40-byte hexadecimal strings. The first
string is the patch ID, and the second string is the commit ID.
This can be used to make a mapping from patch ID to commit ID.
OPTIONS
-------
<patch>::
The diff to create the ID of.
GIT
---
Part of the linkgit:git[1] suite