Better: Prepend .gitconfig with random hash to allow concurrency

[ylecuyer]

Hello,

I followed the advice here https://github.com/dependabot/dependabot-script/blob/main/update-script.rb#L32 and went with looping all dependencies. I also went a bit further and added https://github.com/grosser/parallel with an each in process to speed up the handling of dependencies.

But I faced the issue that all processes try to update the same .gitconfig file at the same time which is locked.

The fix I propose here is to prepend the .gitconfig file name with a random hash to avoid conflicts

[yeikel]

This is an interesting change. I implemented a similar change in my internal fork and I faced the same challenge. Interestedly enough, it only seems to apply to some ecosystems. Maven for example, does not have this problem

[yeikel]

@JamieMagee Can you take a look at this one

[yeikel]

I can confirm that we have seen this with npm and go. Example error:

error: could not lock config file /home/dependabot/.gitconfig: File exists