[INFO] cloning repository https://github.com/musicologyman/rust_variables_stuff
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/musicologyman/rust_variables_stuff" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmusicologyman%2Frust_variables_stuff", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmusicologyman%2Frust_variables_stuff'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a8781d30e8286503271623c8a236fc695e92ce65
[INFO] checking musicologyman/rust_variables_stuff against master#64b185eddaa1d7ddf5e0c024be23b9cbba6c1722 for pr-143929
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmusicologyman%2Frust_variables_stuff" "/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/musicologyman/rust_variables_stuff

Caused by:
    command failed: exit status: 128