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#!/bin/sh
# Test df's behavior when the mount list contains duplicate entries.
# This test is skipped on systems that lack LD_PRELOAD support; that's fine.
# Copyright (C) 2012-2013 Free Software Foundation, Inc.
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
print_ver_ df
df || skip_ "df fails"
# Simulate an mtab file with two entries of the same device number.
cat > k.c <<'EOF' || framework_failure_
#include <stdio.h>
#include <mntent.h>
struct mntent *getmntent (FILE *fp)
{
/* Prove that LD_PRELOAD works. */
static int done = 0;
if (!done)
{
fclose (fopen ("x", "w"));
++done;
}
static struct mntent mntent;
while (done++ < 3)
{
mntent.mnt_fsname = "fsname";
mntent.mnt_dir = "/";
mntent.mnt_type = "-";
return &mntent;
}
return NULL;
}
EOF
# Then compile/link it:
gcc --std=gnu99 -shared -fPIC -ldl -O2 k.c -o k.so \
|| skip_ "getmntent hack does not work on this platform"
# Test if LD_PRELOAD works:
LD_PRELOAD=./k.so df
test -f x || skip_ "internal test failure: maybe LD_PRELOAD doesn't work?"
# The fake mtab file should only contain 2 entries, both
# having the same device number; thus the output should
# consist of a header and one entry.
LD_PRELOAD=./k.so df >out || fail=1
test $(wc -l <out) -eq 2 || { fail=1; cat out; }
# Ensure that filtering duplicates does not affect -a processing.
LD_PRELOAD=./k.so df -a >out || fail=1
test $(wc -l <out) -eq 3 || { fail=1; cat out; }
# Ensure that filtering duplcates does not affect
# argument processing (now without the fake getmntent()).
df '.' '.' >out || fail=1
test $(wc -l <out) -eq 3 || { fail=1; cat out; }
Exit $fail
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