#!/usr/bin/env python3

import errno
import os
import stat
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 should_compare_inode
from posix_parity import stat_cmp_basic
from posix_parity import touch


def stat_cmp_basic_with_inode(lhs, rhs):
    return stat_cmp_basic(lhs, rhs) and lhs.st_ino == rhs.st_ino


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

    mount = sys.argv[1]
    stcmp = stat_cmp_basic_with_inode if should_compare_inode(mount) else stat_cmp_basic

    with tempfile.TemporaryDirectory() as native:
        merge_file = join(mount, "posix-chmod/file")
        native_file = join(native, "posix-chmod/file")
        merge_missing = join(mount, "posix-chmod/missing")
        native_missing = join(native, "posix-chmod/missing")
        merge_notdir = join(mount, "posix-chmod/notdir")
        native_notdir = join(native, "posix-chmod/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(
            "chmod success",
            lambda: os.chmod(merge_file, 0o600),
            lambda: os.chmod(native_file, 0o600),
        )
        if err:
            return fail(err)

        err = compare_calls(
            "chmod stat parity",
            lambda: os.lstat(merge_file),
            lambda: os.lstat(native_file),
            stcmp,
        )
        if err:
            return fail(err)

        err = compare_calls(
            "chmod ENOENT",
            lambda: os.chmod(merge_missing, 0o600),
            lambda: os.chmod(native_missing, 0o600),
        )
        if err:
            return fail(err)

        err = compare_calls(
            "chmod ENOTDIR",
            lambda: os.chmod(join(merge_notdir, "child"), 0o600),
            lambda: os.chmod(join(native_notdir, "child"), 0o600),
        )
        if err:
            return fail(err)

        if os.geteuid() != 0:
            err = compare_calls(
                "chmod EPERM setuid",
                lambda: os.chmod(merge_file, stat.S_ISUID | 0o644),
                lambda: os.chmod(native_file, stat.S_ISUID | 0o644),
            )
            if err:
                return fail(err)
        else:
            _ = errno.EPERM

        return 0


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