[INFO] cloning repository https://github.com/sdufeACM/ContestWatchman
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/sdufeACM/ContestWatchman" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FsdufeACM%2FContestWatchman", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FsdufeACM%2FContestWatchman'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 3379d7de4f5137ceacb147752ce0593343278849
[INFO] checking sdufeACM/ContestWatchman against master#9d28fe39763974a96d61232e96ac856735e4cdd6 for pr-139624
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FsdufeACM%2FContestWatchman" "/workspace/builds/worker-1-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-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/sdufeACM/ContestWatchman

Caused by:
    command failed: exit status: 128