[INFO] cloning repository https://github.com/nellshamrell/sample_file_unit_tests
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/nellshamrell/sample_file_unit_tests" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnellshamrell%2Fsample_file_unit_tests", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnellshamrell%2Fsample_file_unit_tests'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 8b1866751515bc57d3c8ecb40641f63f4b370143
[INFO] checking nellshamrell/sample_file_unit_tests against master#46424fb5054f211ec836c5c03159f92e46bb35ac for pr-139042
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnellshamrell%2Fsample_file_unit_tests" "/workspace/builds/worker-0-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc1/source'...
[INFO] [stderr] error: failed to write new configuration file /workspace/builds/worker-0-tc1/source/.git/config.lock
[INFO] [stderr] fatal: could not set 'core.repositoryformatversion' to '0'


failed to checkout https://github.com/nellshamrell/sample_file_unit_tests

Caused by:
    command failed: exit status: 128