#!/bin/sh

# Before diff-3.4, diff --brief could mistakenly declare a difference.

# For example, when comparing a file like /proc/cmdline (for which the linux

# kernel reports a st_size of 0 even though it is not an empty file) to a

# copy of that file's contents residing on a "normal" file system.

. "${srcdir=.}/init.sh"; path_prepend_ ../src

fail=0

# Skip the test unless we have an appropriate file.

boot=/proc/cmdline

test -r $boot || skip_ no $boot file

sz=$(stat --format %s $boot) || skip_ stat --format %s does not work

test $sz = 0 || skip_ $boot has nonzero size

# /proc/self is not useful on the Hurd, where it always points to "1",

# so skip this test when /proc/self does not point to a file whose name is

# the current process ID.

readlink /proc/self > pid & pid=$!

wait $pid

echo $pid > exp

compare exp pid || skip_ /proc/self is not useful on this system

# There are two code paths to test: one for non-binary and one for binary files.

# $boot is non-binary.

cat $boot > ref || framework_failure_

diff --brief $boot ref > out 2>&1 || fail=1

compare /dev/null out || fail=1

# /proc/self/cmdline is a NUL-terminated list of argv values,

# so construct the expected output here:

printf 'diff\0--brief\0/proc/self/cmdline\0bin\0' > bin || framework_failure_

# And run the command that is embedded in that output:

diff --brief /proc/self/cmdline bin > out 2>&1 || fail=1

compare /dev/null out || fail=1

Exit $fail