Commits on Aug 26, 2023

1. Fix detection of missing commits on checkout …

   I upgraded from 3.31 to 3.52 and started seeing 'reference is not a
   tree' errors in CI. Something in the Buildkite code was not catching
   this properly and causing the agent to recreate the repo.
   
   In my case, this was being caused by force pushes to branches with open
   PRs happening soon after a previous push.
   
   ```
   $ git fetch -v --prune -- origin refs/pull/123/head
   ...
   From github.com:my/repo
    * branch                    refs/pull/123/head -> FETCH_HEAD
   $ git checkout -f 7890000000
   fatal: reference is not a tree: 7890000000
   ⚠️ Warning: Checkout failed! checking out commit "7890000000": exit status 128 (Attempt 1/3 Retrying in 2s)
   $ git clone -v -- git@github.com:my/repo.git .
   Cloning into '.'...
   ...
   $ git clean -fdqx -e /.local
   $ git fetch -v --prune -- origin refs/pull/123/head
   ```
   
   Based on buildkite#2286, I assume
   something similar is happening - the output of the process isn't being
   properly captured.

   

   goodspark committed Aug 26, 2023
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