[INFO] cloning repository https://github.com/fredrik-jansson-se/rust-advent-of-code-2016
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/fredrik-jansson-se/rust-advent-of-code-2016" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffredrik-jansson-se%2Frust-advent-of-code-2016", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffredrik-jansson-se%2Frust-advent-of-code-2016'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] e6ea8b44c2c721bc36bba43648eaa9de214dbd34
[INFO] checking fredrik-jansson-se/rust-advent-of-code-2016 against master#a26e97be8826d408309fffbd8168362365719f50 for pr-136776
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffredrik-jansson-se%2Frust-advent-of-code-2016" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] error: failed to write new configuration file /workspace/builds/worker-6-tc1/source/.git/config.lock
[INFO] [stderr] fatal: could not set 'core.repositoryformatversion' to '0'


failed to checkout https://github.com/fredrik-jansson-se/rust-advent-of-code-2016

Caused by:
    command failed: exit status: 128