I might not have the terminology down yet. I made file to be added to a open project on git. I forked the project. I made some changes and my last commit is the file I want
As I'm doing this a lot, and had to look up this answer a few times, I put SLaks answer into a little batch file. This is for Windows / CMD but should be trivial to port to Linux, Mac or PowerShell. As I usually do several commits, each being one pull request, I also added switching back to the master branch.
@echo off
REM Idea from: https://stackoverflow.com/questions/25955822/git-cherry-pick-a-single-commit-for-pull-request
set BRANCH_NAME=%1
set COMMIT_HASH=%2
IF %BRANCH_NAME%.==. GOTO NoBranchName
IF %COMMIT_HASH%.==. GOTO NoCommitId
git checkout -b %BRANCH_NAME%
git fetch upstream
git reset --hard upstream/master
git cherry-pick %COMMIT_HASH%
git push origin %BRANCH_NAME%:%BRANCH_NAME%
git switch master
GOTO End
:NoBranchName
ECHO No branch name given. Usage: add-pull-request.bat BRANCH_NAME COMMIT_HASH
GOTO End
:NoCommitId
ECHO No commit id given. Usage: add-pull-request.bat BRANCH_NAME COMMIT_HASH
GOTO End
:End
One obvious improvement would be first picking up the current branch and then use that in the last line but that's something I didn't need and it would make the whole thing significantly more complex.
You need to create a fresh branch from the remote HEAD, cherry-pick the commit to that branch, push the branch to your repo on GitHub, then create a pull request.
git checkout -b mybranch
git fetch upstream
git reset --hard upstream/master
git cherry-pick <commit-hash>
git push origin mybranch:mybranch