[INFO] cloning repository https://github.com/rajshukla1102/rust-cli
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/rajshukla1102/rust-cli" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frajshukla1102%2Frust-cli", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frajshukla1102%2Frust-cli'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 4e0f4aa316f510ba2b8f4e554ce3d84b98059c34
[INFO] checking rajshukla1102/rust-cli against master#f21fbac535ab2c3bc50db20547f4d48477357103 for pr-143193
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frajshukla1102%2Frust-cli" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] [stderr] fatal: update_ref failed for ref 'HEAD': cannot update ref 'refs/heads/master': couldn't write '/workspace/builds/worker-4-tc1/source/.git/refs/heads/master.lock'


failed to checkout https://github.com/rajshukla1102/rust-cli

Caused by:
    command failed: exit status: 128