[INFO] cloning repository https://github.com/wowkster/eulers_method
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/wowkster/eulers_method" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwowkster%2Feulers_method", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwowkster%2Feulers_method'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 5106ec30997c1e83f2a775a8aa7ac6769660eaec
[INFO] checking wowkster/eulers_method against master#068609ce766e55d2e7371cd2a86143a6d7e8e2e4 for pr-138952
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwowkster%2Feulers_method" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] error: failed to write new configuration file /workspace/builds/worker-4-tc1/source/.git/config.lock
[INFO] [stderr] fatal: could not set 'core.repositoryformatversion' to '0'


failed to checkout https://github.com/wowkster/eulers_method

Caused by:
    command failed: exit status: 128