[INFO] cloning repository https://github.com/rmc8/rustbook_chap4
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/rmc8/rustbook_chap4" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frmc8%2Frustbook_chap4", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frmc8%2Frustbook_chap4'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 82b26005646a693ef1d840f6dd11909017e2ba6d
[ERROR] this task or one of its parent failed!
[ERROR] command failed: exit status: 101
[ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace.