Remove the "pants.pex for integration tests" code, because pants is r…

…un from the PYTHONPATH of the test target, which will automatically include either loose sources or requirements, depending on whether the test is run in or out of the pantsbuild/pants repo.

# Rust tests will be skipped. Delete if not intended.
[ci skip-rust-tests]

BUILD

@@ -32,10 +32,3 @@ files(
   name = 'pyproject',
   sources = ['pyproject.toml'],
 )
-
-# NB: This is used for integration tests. This is generated automatically via `./pants` and
-# `build-support/bin/bootstrap_pants_pex.sh`.
-files(
-  name = 'pants_pex',
-  sources = ['pants.pex'],
-)

pants

@@ -106,27 +106,4 @@ else
   export PANTS_DEV=1
 fi
 
-# Integration tests depend on an up-to-date `pants.pex`. Here, we check if we're running tests
-# and ensure the `pants.pex` is generated if so. We do this here, rather than via `pants-plugins`,
-# because we want the file to be generated _before_ any tests run, not during that Pants invocation,
-# as the dependency is marked via BUILD files so should not be constructed at runtime.
-#
-# Note that we have no way to distinguish between integration tests vs unit tests here, so we
-# unfortunately rebuild the pants.pex for unit tests too.
-#
-# We do not do this when in CI because CI downloads the PEX from AWS and we never want a worker
-# shard to try bootstrapping the PEX itself.
-test_goal_used=false
-for arg in "$@"; do
-  if [[ "${arg}" == 'test' || "${arg}" == 'test.*' ]]; then
-    test_goal_used=true
-  fi
-done
-
-no_regen_pex="${NO_REGEN_PEX:-${TRAVIS}}"
-if [[ "${test_goal_used}" == 'true' && "${no_regen_pex}" != 'true' ]]; then
-  "$HERE/build-support/bin/bootstrap_pants_pex.sh"
-  echo -e "Finished bootstrapping pants.pex for integration tests.\n" >&2
-fi
-
 exec_pants_bare "$@"

src/python/pants/testutil/BUILD

@@ -25,7 +25,6 @@ python_library(
   sources = ['pants_run_integration_test.py'],
   dependencies = [
     '//:build_root',
-    '//:pants_pex',
     '3rdparty/python:ansicolors',
     '3rdparty/python:dataclasses',
     'src/python/pants/base:build_environment',