#!/bin/bash

[ -f testing.sh ] && . testing.sh

# ext stores extended attributes in a way that makes all the numbers in the
# tests below incorrect.
# TODO: include a read-only ext file system that we can mount for the tests?
if [ "$(stat --format %C . 2>/dev/null)" != "?" ]; then
  echo "$SHOWSKIP: du (SELinux extended attributes present)"
  return 2>/dev/null
  exit
fi

# darwin stores empty directories in the inode itself, making all the numbers
# in the tests below 0. (TODO this is not the right fix.)
if [ "$(uname)" == "Darwin" ]; then
  echo "$SHOWSKIP: du (Darwin stores empty directories in inode)"
  return 2>/dev/null
  exit
fi

#testing "name" "command" "result" "infile" "stdin"

# we only test with -k since getting POSIX version is variable
# POSIXLY_CORRECT is sometimes needed, sometimes -P is needed,
# while -k is the default on most Linux systems

mkdir -p du_test/test du_2/foo
testing "(no options)" "du -k du_test" "4\tdu_test/test\n8\tdu_test\n" "" ""
testing "-s" "du -k -s du_test" "8\tdu_test\n" "" ""
ln -s ../du_2 du_test/xyz
# "du shall count the size of the symbolic link"
# The tests assume that like for most POSIX systems symbolic
# links are stored directly in the inode so that the
# allocated file space is zero.
testing "counts symlinks without following" "du -ks du_test" "8\tdu_test\n" "" ""
testing "-L follows symlinks" "du -ksL du_test" "16\tdu_test\n" "" ""
ln -s . du_test/up
testing "-L avoid endless loop" "du -ksL du_test" "16\tdu_test\n" "" ""
rm du_test/up
# if -H and -L are specified, the last takes priority
testing "-HL follows symlinks" "du -ksHL du_test" "16\tdu_test\n" "" ""
testing "-H does not follow unspecified symlinks" "du -ksH du_test" "8\tdu_test\n" "" ""
testing "-LH does not follow unspecified symlinks" "du -ksLH du_test" "8\tdu_test\n" "" ""
testing "-H follows specified symlinks" "du -ksH du_test/xyz" "8\tdu_test/xyz\n" "" ""

rm -rf du_test du_2