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Tip revision: c753e2a7a8e81c646611e808ce3b7a68f6e90add authored by Johannes Schindelin on 12 February 2021, 14:49:41 UTC
Git 2.22.5
Git 2.22.5
Tip revision: c753e2a
git-patch-id.txt
git-patch-id(1)
===============
NAME
----
git-patch-id - Compute unique ID for a patch
SYNOPSIS
--------
[verse]
'git patch-id' [--stable | --unstable]
DESCRIPTION
-----------
Read a patch from the standard input and compute the patch ID for it.
A "patch ID" is nothing but a sum of SHA-1 of the file diffs 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
-------
--stable::
Use a "stable" sum of hashes as the patch ID. With this option:
- Reordering file diffs that make up a patch does not affect the ID.
In particular, two patches produced by comparing the same two trees
with two different settings for "-O<orderfile>" result in the same
patch ID signature, thereby allowing the computed result to be used
as a key to index some meta-information about the change between
the two trees;
- Result is different from the value produced by git 1.9 and older
or produced when an "unstable" hash (see --unstable below) is
configured - even when used on a diff output taken without any use
of "-O<orderfile>", thereby making existing databases storing such
"unstable" or historical patch-ids unusable.
This is the default if patchid.stable is set to true.
--unstable::
Use an "unstable" hash as the patch ID. With this option,
the result produced is compatible with the patch-id value produced
by git 1.9 and older. Users with pre-existing databases storing
patch-ids produced by git 1.9 and older (who do not deal with reordered
patches) may want to use this option.
This is the default.
GIT
---
Part of the linkgit:git[1] suite