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git-patch-id(1) [osx man page]

GIT-PATCH-ID(1) 						    Git Manual							   GIT-PATCH-ID(1)

git-patch-id - Compute unique ID for a patch SYNOPSIS
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: o 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; o 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 git(1) suite Git 2.17.1 10/05/2018 GIT-PATCH-ID(1)

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GIT-CHERRY(1)							    Git Manual							     GIT-CHERRY(1)

git-cherry - Find commits not merged upstream SYNOPSIS
git cherry [-v] [<upstream> [<head> [<limit>]]] DESCRIPTION
The changeset (or "diff") of each commit between the fork-point and <head> is compared against each commit between the fork-point and <upstream>. The commits are compared with their patch id, obtained from the git patch-id program. Every commit that doesn't exist in the <upstream> branch has its id (sha1) reported, prefixed by a symbol. The ones that have equivalent change already in the <upstream> branch are prefixed with a minus (-) sign, and those that only exist in the <head> branch are prefixed with a plus (+) symbol: __*__*__*__*__> <upstream> / fork-point \__+__+__-__+__+__-__+__> <head> If a <limit> has been given then the commits along the <head> branch up to and including <limit> are not reported: __*__*__*__*__> <upstream> / fork-point \__*__*__<limit>__-__+__> <head> Because git cherry compares the changeset rather than the commit id (sha1), you can use git cherry to find out if a commit you made locally has been applied <upstream> under a different commit id. For example, this will happen if you're feeding patches <upstream> via email rather than pushing or pulling commits directly. OPTIONS
-v Verbose. <upstream> Upstream branch to compare against. Defaults to the first tracked remote branch, if available. <head> Working branch; defaults to HEAD. <limit> Do not report commits up to (and including) limit. SEE ALSO
git-patch-id(1) GIT
Part of the git(1) suite Git 06/10/2014 GIT-CHERRY(1)
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