[INFO] cloning repository https://github.com/ubuntu-assist/learning-rust-blockchain
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ubuntu-assist/learning-rust-blockchain" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fubuntu-assist%2Flearning-rust-blockchain", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fubuntu-assist%2Flearning-rust-blockchain'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] f2b76e5709e004ec38a7724c3dca04f149cdd5fd
[INFO] checking ubuntu-assist/learning-rust-blockchain against master#fce0e74720d199eb7839fdb51af35ac5226da178 for pr-145262
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fubuntu-assist%2Flearning-rust-blockchain" "/workspace/builds/worker-7-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-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/ubuntu-assist/learning-rust-blockchain

Caused by:
    command failed: exit status: 128