Apply patch generated by git-diff

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For example, this patch will swap a and b:. Hunk headers mention the name of the function to which the hunk applies. See "Defining a custom hunk-header" in gitattributes[5] for details of how to tailor to this to specific languages. Any diff-generating command can take the -c or --cc option to produce a combined diff when showing a merge.

This is the default format when showing merges with git-diff[1] or git-show[1]. Note also that you can give suitable --diff-merges option to any of these commands to force generation of diffs in specific format.

It is preceded with a "git diff" header, that looks like this when the -c option is used :. It is followed by one or more extended header lines this example shows a merge with two parents :. This extended format can be useful if rename or copy detection is active, to allow you to see the original name of the file in different parents. Chunk header format is modified to prevent people from accidentally feeding it to patch -p1. We will use the git diff command to create the diff output, then redirect it into a file.

The form of the diff command we will use is as follows:. We specify the two commits by their unique hash. Generally, you only have to specify enough of the commit hash to ensure its uniqueness 4 characters will probably do it. In this special case, where we want to create a patch of the entire branch, we can let GIT do some of the work for us. We can let GIT determine the point at which our experimental branch diverged from the master branch using the git merge-base command:.

Notice also how this time we have omitted. Once the patch file has been made, applying it is easy. Make sure that the branch you have checked out is the one that you want to apply the patch to master in our case. Then you can apply the patch using the git apply command: git apply. Warning: Although applying a patch in this way will exactly replicate content, no commit history will be replicated. This means that even if the patch you create spans several commits, it will appear as a single set of changes when applied.

You will lose both the knowledge of how the commits were broken up and also the messages for each commit. Applying the patch did not commit the changes, nor did it bring any of the commit history associated with these changes with it.