[INFO] cloning repository https://github.com/mckee/tilt
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/mckee/tilt" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmckee%2Ftilt", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmckee%2Ftilt'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d2d2dfa7a6df30e39812a60ad759d738552e526f
[INFO] checking mckee/tilt against master#01706e1a34c87656fcbfce198608f4cd2ac6461a for pr-135272
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmckee%2Ftilt" "/workspace/builds/worker-5-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc1/source'...
[INFO] [stderr] done.
[INFO] [stderr] fatal: update_ref failed for ref 'HEAD': cannot update ref 'refs/heads/main': couldn't write '/workspace/builds/worker-5-tc1/source/.git/refs/heads/main.lock'


failed to checkout https://github.com/mckee/tilt

Caused by:
    command failed: exit status: 128