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Ran 12 Nov 2020 01:46AM UTC

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Build # 36450

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push

travis-ci-com

Committed by

web-flow

Commit Message

Re-land the port of Pants' nailgun client to Rust (#11147)

### Problem

#10865 previously landed to port Pants' nailgun client to Rust. It was reverted in #10929 due to an issue with TTY access, where (in particular), the `repl` goal was mostly unresponsive.

### Solution

The unresponsive `repl` was due to a bug in the `nails` library, where `stdin` was being consumed eagerly regardless of whether the server signaled that it would like to receive `stdin`. Pants sends an environment variable to the server that indicates which TTY the client is connected to, and the server will directly connect to that TTY if it can. When the server directly connects to the client's TTY, it does not accept `stdin`, but since `stdin` was read eagerly by the `nails` client (and ending up stuck in a buffer, since the server would not request it), the result was two different processes reading `stdin` from the TTY: the client, and the server.

Bump to `nails` `0.7.0`, which [makes `stdin` initialization lazy](https://github.com/stuhood/nails/commit/6b8c19ae4).

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ID	Job ID	Ran	Files	Coverage
5	36450.5 (PANTS_CONFIG_FILES="${TRAVIS_BUILD_DIR}/pants.travis-ci.toml" PANTS_DYNAMIC_UI=false LC_ALL="en_US.UTF-8" AWS_BUCKET=ci-public.pantsbuild.org BOOTSTRAPPED_PEX_KEY_PREFIX=daily/${TRAVIS_BUILD_NUMBER}/${TRAVIS_BUILD_ID}/pants.pex NATIVE_ENGINE_SO_KEY_PREFIX=monthly/native_engine_so MACOS_PYENV_PY27_VERSION=2.7.18 MACOS_PYENV_PY36_VERSION=3.6.10 MACOS_PYENV_PY37_VERSION=3.7.7 MACOS_PYENV_PY38_VERSION=3.8.3 PYENV_ROOT_OSX=${HOME}/.pants_pyenv PYENV_ROOT="${PYENV_ROOT:-${PYENV_ROOT_OSX}}" PATH="${PYENV_ROOT}/shims:${PATH}" AWS_CLI_ROOT="${HOME}/.aws_cli" AWS_ACCESS_KEY_ID__TO_BE_REEXPORTED_ON_DEPLOYS=AKIAV6A6G7RQ2HFZ5KP7 AWS_SECRET_ACCESS_KEY=[secure] RUST_BACKTRACE="all" BOOTSTRAPPED_PEX_KEY_SUFFIX=py36.linux CACHE_NAME=python_tests.py36)	12 Nov 2020 01:46AM UTC	0	0.0	Travis Job 36450.5

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