[INFO] cloning repository https://github.com/uncenter/nixpkgs-track
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/uncenter/nixpkgs-track" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Funcenter%2Fnixpkgs-track", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Funcenter%2Fnixpkgs-track'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b94052fbbd66e299c651cf6c8f6aee951b0fa618
[INFO] checking uncenter/nixpkgs-track against master#4ecd70ddd1039a3954056c1071e40278048476fa for pr-137633
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Funcenter%2Fnixpkgs-track" "/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] error: unable to write symref for HEAD: No space left on device
[INFO] [stderr] fatal: unable to update HEAD


failed to checkout https://github.com/uncenter/nixpkgs-track

Caused by:
    command failed: exit status: 128