I’ve was making use of Octokit to read a file (>10MB) from from my repo, add a line and then commit the updated file.

This consisted of octokit.request('https://api.github.com/repos/{owner}/{repo}/git/trees/main') and octokit.request('GET /repos/{owner}/{repo}/git/blobs/{file_sha}' to get the SHA and retrieve the existing commit. I was then writing the file to a /tmp file in an AWS Lambda function and adding the new line. Lastly, I used octokit.request('PUT /repos/{owner}/{repo}/contents/{path}' to commit the new content from the temp file.

But, obviously, this involves a large data transfer and… I’d rather not! Is there a way to achieve this without the data transfer, such as a git-apply, that I can make use of in my Lambda function? Each commit will just be an additional line, guaranteed. Not bound to Octokit, hence asking here, but this will be performed in a Lambda (ideally Node, it’s what I’m comfy with!)

Pointers appreciated. TIA!