Windows: py_binary launcher incorrectly escapes arguments

[laszlocsomor]

Description of the problem / feature request:

On Windows, py_binary.args and py_test.args are not Bash-tokenized and not escaped properly.

This bug is similar to #7072.

Bugs: what's the simplest, easiest way to reproduce this bug? Please provide a minimal example if possible.

BUILD:

py_binary(
    name = "binargs",
    srcs = ["testargs.py"],
    main = "testargs.py",
    args = ["foo", r"a\\\"", "bar"],
)

py_test(
    name = "testargs",
    srcs = ["testargs.py"],
    args = ["foo", r"a\\\"", "bar"],
)

testargs.py:

from __future__ import print_function
import sys
for a in sys.argv[1:]:
    print("arg=(%s)" % a)

Actual (buggy) output:

C:\src\tmp>bazel run binargs
(...)
arg=(foo)
arg=(a\ bar)

C:\src\tmp>bazel test testargs --test_output=all
(...)
arg=(foo)
arg=(a\\ bar)

Desired output:

arg=(foo)
arg=(a\")
arg=(bar)

What operating system are you running Bazel on?

windows 10

What's the output of bazel info release?

release 0.24.1

[laszlocsomor]

Fixed in Bazel 0.27