[INFO] cloning repository https://github.com/samfoo/carto
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/samfoo/carto" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsamfoo%2Fcarto", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsamfoo%2Fcarto'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 8b6b29c9e7e9a5d8d2e7d6b0551ba1ea0b8f148a
[INFO] checking samfoo/carto against master#85c39893a761fe4c050523278da4e7e45ab42b6e for pr-134688
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsamfoo%2Fcarto" "/workspace/builds/worker-5-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-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-5-tc1/source/.git/refs/heads/master.lock'


ExecutionFailed(ExitStatus(unix_wait_status(32768)))

failed to checkout https://github.com/samfoo/carto