Update git.fetch calls to use depth=1

[webmonarch]

This works for me locally, but I am not sure of the total implications to other use-cases. I explicitly didn't update the push to fork use-case when mentioned it's not supported.

For me, it went from 18+ minutes -> 7s. YMMV

Fixes #2809

[peter-evans]

I've gone back and reviewed the places where git fetch is used, and tried to remind myself why depth=1 cannot be used in some cases. (I also have tests covering these cases.)

There are four cases where git fetch is used. The two that I think are affecting you are the ones inside the if (workingBase != base) block, which you have added depth=1 to. I think these changes might actually be ok for all use cases! I've run all the tests for this and it seems fine. 👍

The depth=1 change you have made in the tryFetch function definitely will not work in all cases. This fetch is used for the pull request branch and if it has more than 1 commit it won't work correctly.

The other git fetch case (which you didn't add depth=1 to) also will not work. Unfortunately, that case in particular needs to "unshallow" the branch in order to work correctly. But I don't think that particular case affects you anyway. It's only used when using the push-to-fork feature.

So let's remove the --depth=1 in the tryFetch function and see if the remaining changes still solve the perf issue for you.

[webmonarch]

Thanks @peter-evans for taking the time. I updated the PR based on your guidance. Back to you!

[peter-evans]

The tests are failing, but I thought I checked them the other day. 🤔 I'll investigate.

[webmonarch]

I didn't see how to run the docker part of the test suite locally. LMK!

UPDATE: I guess I need to have Docker running... 😬

[peter-evans]

npm run test should run the unit and integration tests. However, don't worry about it, I realise now that I need to make some changes to a handful of the integration tests to cope with this change. I think the change is ok, it's probably just my tests need to be adjusted. I'll try to work on it tomorrow.

If it's ok, I'll commit test changes directly to your branch.

[peter-evans]

I thought I could push to your branch because it says "Maintainers are allowed to edit this pull request" but it didn't work. So I'll merge this to a feature branch and add the necessary changes before reopening a PR.

[peter-evans]

@webmonarch Thank you for this contribution! A nice performance improvement for this case.

This is released as v6.0.2 / v6