FAIL: test_prlimit (test.test_resource.ResourceTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/builddir/build/BUILD/Python-3.6.2/Lib/test/support/__init__.py", line 556, in wrapper
    return func(*args, **kw)
  File "/builddir/build/BUILD/Python-3.6.2/Lib/test/test_resource.py", line 153, in test_prlimit
    1, resource.RLIMIT_AS)
AssertionError: PermissionError not raised by prlimit


I observed this issue when mock [0] the underlying build system we use in Fedora started using the systemd-nspawn container technology instead of chroot [1][2] in order to create a minimal build environment.

[0] https://github.com/rpm-software-management/mock
[1] https://github.com/rpm-software-management/mock/wiki/Release-Notes-1.4.1
[2] https://www.freedesktop.org/software/systemd/man/systemd-nspawn.html

So the issue seems to be that Python believes it's run without root privileges, but it's mistaken because it indeed has root.

Maybe we should simply skip the test if the user is root? If os.getuid()==0.

The test is already skipped if the user is root. It verifies that process 1 can't be touched by non-root users.

The problem is an assumption that process with PID 1 belongs to root. That assumption isn't true in containers: PID 1 is whatever the container was started with -- in this case, likely a test runner or build system.

On Linux, we could check if `/proc/1` actually belongs to root. I don't know about other systems, though.
Would that change be acceptable?

New changeset 01e0afa994c2e840f85e2de103e72a2c0ddf1b1f by Miss Islington (bot) (Benjamin Peterson) in branch 'master':
bpo-31132: Remove prlimit permission test. (GH-9280)
https://github.com/python/cpython/commit/01e0afa994c2e840f85e2de103e72a2c0ddf1b1f

New changeset 2b162941c0793e0dd5533ee3090901cba9d8cf7d by Miss Islington (bot) in branch '3.7':
bpo-31132: Remove prlimit permission test. (GH-9280)
https://github.com/python/cpython/commit/2b162941c0793e0dd5533ee3090901cba9d8cf7d

New changeset f79d74d5a3ceb06b63996e8ecf23e419e16e4be2 by Miss Islington (bot) in branch '3.6':
bpo-31132: Remove prlimit permission test. (GH-9280)
https://github.com/python/cpython/commit/f79d74d5a3ceb06b63996e8ecf23e419e16e4be2