[INFO] cloning repository https://github.com/mich101mich/aoc-2016
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/mich101mich/aoc-2016" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmich101mich%2Faoc-2016", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmich101mich%2Faoc-2016'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 954f2eb91baf91643480ae1d76108654496be4ba
[INFO] testing mich101mich/aoc-2016 against 1.95.0 for beta-1.96-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmich101mich%2Faoc-2016" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-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-6-tc1/source/.git/refs/heads/master.lock'


overridden task result to prepare-fail:unknown

Caused by:
    0: uncategorized prepare error
    1: failed to checkout https://github.com/mich101mich/aoc-2016
    2: command failed: exit status: 128