[INFO] cloning repository https://github.com/bradneuman/rusty-sudoku
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/bradneuman/rusty-sudoku" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbradneuman%2Frusty-sudoku", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbradneuman%2Frusty-sudoku'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 0a8f9fae26c35a7935d8278ec43497283ee3f4ec
[INFO] checking bradneuman/rusty-sudoku against master#64b185eddaa1d7ddf5e0c024be23b9cbba6c1722 for pr-143929
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbradneuman%2Frusty-sudoku" "/workspace/builds/worker-5-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc1/source'...
[INFO] [stderr] done.
[INFO] [stderr] fatal: update_ref failed for ref 'HEAD': cannot update ref 'refs/heads/main': couldn't write '/workspace/builds/worker-5-tc1/source/.git/refs/heads/main.lock'


failed to checkout https://github.com/bradneuman/rusty-sudoku

Caused by:
    command failed: exit status: 128