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#!/bin/sh
# Test df's behaviour when the mount list cannot be read.
# This test is skipped on systems that lack LD_PRELOAD support; that's fine.
# Copyright (C) 2012-2021 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 <https://www.gnu.org/licenses/>.
. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
print_ver_ df
require_gcc_shared_
# Protect against inaccessible remote mounts etc.
timeout 10 df || skip_ "df fails"
grep '^#define HAVE_MNTENT_H 1' $CONFIG_HEADER > /dev/null \
|| skip_ "no mntent.h available to confirm the interface"
grep '^#define HAVE_GETMNTENT 1' $CONFIG_HEADER > /dev/null \
|| skip_ "getmntent is not used on this system"
# Simulate "mtab" failure.
cat > k.c <<EOF || framework_failure_
#define _GNU_SOURCE
#include <stdio.h>
#include <errno.h>
#include <mntent.h>
#include <string.h>
#include <dlfcn.h>
#define STREQ(a, b) (strcmp (a, b) == 0)
FILE* fopen(const char *path, const char *mode)
{
static FILE* (*fopen_func)(char const *, char const *);
/* get reference to original (libc provided) fopen */
if (!fopen_func)
{
fopen_func = (FILE*(*)(char const *, char const *))
dlsym(RTLD_NEXT, "fopen");
if (!fopen_func)
{
fprintf (stderr, "Failed to find fopen()\n");
errno = ESRCH;
return NULL;
}
}
/* Returning ENOENT here will get read_file_system_list()
to fall back to using getmntent() below. */
if (STREQ (path, "/proc/self/mountinfo"))
{
errno = ENOENT;
return NULL;
}
else
return fopen_func(path, mode);
}
struct mntent *getmntent (FILE *fp)
{
/* Prove that LD_PRELOAD works. */
static int done = 0;
if (!done)
{
fclose (fopen ("x", "w"));
++done;
}
/* Now simulate the failure. */
errno = ENOENT;
return NULL;
}
EOF
# Then compile/link it:
gcc_shared_ k.c k.so \
|| framework_failure_ 'failed to build shared library'
cleanup_() { unset LD_PRELOAD; }
export LD_PRELOAD=$LD_PRELOAD:./k.so
# Test if LD_PRELOAD works:
df 2>/dev/null
test -f x || skip_ "internal test failure: maybe LD_PRELOAD doesn't work?"
# These tests are supposed to succeed:
df '.' || fail=1
df -i '.' || fail=1
df -T '.' || fail=1
df -Ti '.' || fail=1
df --total '.' || fail=1
# These tests are supposed to fail:
returns_ 1 df || fail=1
returns_ 1 df -i || fail=1
returns_ 1 df -T || fail=1
returns_ 1 df -Ti || fail=1
returns_ 1 df --total || fail=1
returns_ 1 df -a || fail=1
returns_ 1 df -a '.' || fail=1
returns_ 1 df -l || fail=1
returns_ 1 df -l '.' || fail=1
returns_ 1 df -t hello || fail=1
returns_ 1 df -t hello '.' || fail=1
returns_ 1 df -x hello || fail=1
returns_ 1 df -x hello '.' || fail=1
Exit $fail
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