[INFO] cloning repository https://github.com/hzeng2000/exam-grading
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/hzeng2000/exam-grading" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhzeng2000%2Fexam-grading", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhzeng2000%2Fexam-grading'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 20a93080826a267313c46a2e2dbfc532ee10713a
[INFO] checking hzeng2000/exam-grading against master#46424fb5054f211ec836c5c03159f92e46bb35ac for pr-139042
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhzeng2000%2Fexam-grading" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] [stderr] fatal: update_ref failed for ref 'HEAD': cannot update the ref 'HEAD': unable to append to '/workspace/builds/worker-3-tc1/source/.git/logs/HEAD': No space left on device


failed to checkout https://github.com/hzeng2000/exam-grading

Caused by:
    command failed: exit status: 128