#!/usr/bin/env python3

import os
import sys
import tempfile

from posix_parity import cleanup_paths
from posix_parity import compare_calls
from posix_parity import fail
from posix_parity import join
from posix_parity import touch


def main():
    if len(sys.argv) != 2:
        print("usage: TEST_posix_chown <mountpoint>", file=sys.stderr)
        return 1

    mount = sys.argv[1]
    uid = os.getuid()
    gid = os.getgid()

    with tempfile.TemporaryDirectory() as native:
        merge_file = join(mount, "posix-chown/file")
        native_file = join(native, "posix-chown/file")
        merge_missing = join(mount, "posix-chown/missing")
        native_missing = join(native, "posix-chown/missing")
        merge_notdir = join(mount, "posix-chown/notdir")
        native_notdir = join(native, "posix-chown/notdir")

        cleanup_paths([merge_file, merge_notdir])

        touch(merge_file, b"x", 0o644)
        touch(native_file, b"x", 0o644)
        touch(merge_notdir, b"x", 0o644)
        touch(native_notdir, b"x", 0o644)

        err = compare_calls(
            "chown self",
            lambda: os.chown(merge_file, uid, gid),
            lambda: os.chown(native_file, uid, gid),
        )
        if err:
            return fail(err)

        err = compare_calls(
            "chown ENOENT",
            lambda: os.chown(merge_missing, uid, gid),
            lambda: os.chown(native_missing, uid, gid),
        )
        if err:
            return fail(err)

        err = compare_calls(
            "chown ENOTDIR",
            lambda: os.chown(join(merge_notdir, "child"), uid, gid),
            lambda: os.chown(join(native_notdir, "child"), uid, gid),
        )
        if err:
            return fail(err)

        if os.geteuid() != 0:
            err = compare_calls(
                "chown EPERM foreign uid",
                lambda: os.chown(merge_file, 0, gid),
                lambda: os.chown(native_file, 0, gid),
            )
            if err:
                return fail(err)

        return 0


if __name__ == "__main__":
    raise SystemExit(main())