[INFO] cloning repository https://github.com/perzeroo/chip-8-emulator
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/perzeroo/chip-8-emulator" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fperzeroo%2Fchip-8-emulator", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fperzeroo%2Fchip-8-emulator'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 5c0e5814da4e5faa0a87c6e0c914e920df639ce6
[INFO] checking perzeroo/chip-8-emulator against master#be181dd75c83d72fcc95538e235768bc367b76b9 for pr-140208
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fperzeroo%2Fchip-8-emulator" "/workspace/builds/worker-0-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc1/source'...
[INFO] [stderr] done.
[INFO] [stderr] fatal: update_ref failed for ref 'HEAD': cannot update ref 'refs/heads/master': couldn't write '/workspace/builds/worker-0-tc1/source/.git/refs/heads/master.lock'


failed to checkout https://github.com/perzeroo/chip-8-emulator

Caused by:
    command failed: exit status: 128