sebastiandaschner blog
Create Git patches from command line
friday, february 14, 2020Git patches are an easy way to apply changes to a project if you don’t want to go through the regular commit-pull-request flow. Patches are files that contain an equivalent diff of a Git commit.
You can create a patch of your modified working state using git diff
.
The diff
output is in the correct patch format.
$> git status
On branch master
Changes not staged for commit:
(use "git add <file>..." to update what will be committed)
(use "git checkout -- <file>..." to discard changes in working directory)
modified: hello.txt
no changes added to commit (use "git add" and/or "git commit -a")
$> git diff > ~/important-changes.patch
This will create a simple patch file that can be applied to a different repo and will create the same file changes in the working directory:
$> git status
On branch master
nothing to commit, working tree clean
$> git apply ~/important-changes.patch
$> git status
On branch master
Changes not staged for commit:
[...]
modified: hello.txt
What’s also possible is to create a formatted patch from commits which includes the commit metadata. These patches were created to be sent via email.
You can use git format-patch <since>
to create a patch from all commits since a certain point, or within a range, respectively.
$> git format-patch origin/master --output ~/ /home/sebastian/0001-changed-file.patch /home/sebastian/0002-changed-file-again.patch # or into a single file $> git format-patch origin/master --stdout > ~/important-commits.patch
Again, these changes can be applied using git apply
.
Now, we can also use git am
to apply all commits including their metadata:
$> git am ~/important-commits.patch Applying: changed file Applying: changed file again
These patches can be helpful for local workaround that you need to apply to codebases every now and then.
The content of this post was reposted from my newsletter issue 037.
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