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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) 2012-2025 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/>.
. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
print_ver_ df
require_gcc_shared_
# We use --local here so as to not activate
# potentially very many remote mounts.
df --local --output=target >LOCAL_FS || skip_ 'df fails'
grep '^/$' LOCAL_FS || skip_ 'no root file system found'
# Get real targets to substitute for /NONROOT and /REMOTE below.
export CU_NONROOT_FS=$(grep /. LOCAL_FS | head -n1)
export CU_REMOTE_FS=$(grep /. LOCAL_FS | tail -n+2 | head -n1)
unique_entries=1
test -z "$CU_NONROOT_FS" || unique_entries=$(expr $unique_entries + 1)
test -z "$CU_REMOTE_FS" || unique_entries=$(expr $unique_entries + 2)
grep '^#define HAVE_GETMNTENT 1' $CONFIG_HEADER > /dev/null \
|| skip_ "getmntent is not used on this system"
# Simulate an mtab file to test various cases.
# Replace gnulib streq and C23 nullptr as that are not available here.
sed 's/streq/0==str''cmp/; s/nullptr/NU''LL/' > k.c <<EOF || framework_failure_
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <fcntl.h>
#include <mntent.h>
#include <string.h>
#include <stdarg.h>
#include <dlfcn.h>
static FILE* (*fopen_func)(const char *, const char *);
FILE* fopen(const char *path, const char *mode)
{
/* get reference to original (libc provided) fopen */
if (!fopen_func)
{
fopen_func = (FILE*(*)(const char *, const char *))
dlsym(RTLD_NEXT, "fopen");
if (!fopen_func)
{
fprintf (stderr, "Failed to find fopen()\n");
errno = ESRCH;
return nullptr;
}
}
/* 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 nullptr;
}
return fopen_func(path, mode);
}
int open(const char *path, int flags, ...)
{
static int (*open_func)(const char *, int, ...);
/* get reference to original (libc provided) open */
if (!open_func)
{
open_func = (int(*)(const char *, int, ...))
dlsym(RTLD_NEXT, "open");
if (!open_func)
{
fprintf (stderr, "Failed to find open()\n");
errno = ESRCH;
return -1;
}
}
/* 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 -1;
}
va_list ap;
va_start (ap, flags);
mode_t mode = (sizeof (mode_t) < sizeof (int)
? va_arg (ap, int)
: va_arg (ap, mode_t));
va_end (ap);
return open_func(path, flags, mode);
}
struct mntent *getmntent (FILE *fp)
{
static char *nonroot_fs;
static char *remote_fs;
static int done;
/* Prove that LD_PRELOAD works. */
if (!done)
{
fclose (fopen_func ("x", "w"));
++done;
}
static struct mntent mntents[] = {
{.mnt_fsname="/short", .mnt_dir="/invalid/mount/dir", .mnt_opts=""},
{.mnt_fsname="fsname", .mnt_dir="/", .mnt_opts=""},
{.mnt_fsname="/fsname", .mnt_dir="/.", .mnt_opts=""},
{.mnt_fsname="/fsname", .mnt_dir="/", .mnt_opts=""},
{.mnt_fsname="virtfs", .mnt_dir="/NONROOT", .mnt_type="t1", .mnt_opts=""},
{.mnt_fsname="virtfs2", .mnt_dir="/NONROOT", .mnt_type="t2", .mnt_opts=""},
{.mnt_fsname="netns", .mnt_dir="net:[1234567]", .mnt_opts=""},
{.mnt_fsname="rem:ote1",.mnt_dir="/REMOTE", .mnt_opts=""},
{.mnt_fsname="rem:ote1",.mnt_dir="/REMOTE", .mnt_opts=""},
{.mnt_fsname="rem:ote2",.mnt_dir="/REMOTE", .mnt_opts=""},
};
if (done == 1)
{
nonroot_fs = getenv ("CU_NONROOT_FS");
if (!nonroot_fs || !*nonroot_fs)
nonroot_fs = "/"; /* merge into / entries. */
remote_fs = getenv ("CU_REMOTE_FS");
}
if (done == 1 && !getenv ("CU_TEST_DUPE_INVALID"))
done++; /* skip the first entry. */
while (done++ <= 10)
{
if (!mntents[done-2].mnt_type)
mntents[done-2].mnt_type = "-";
if (!mntents[done-2].mnt_opts)
mntents[done-2].mnt_opts = "-";
if (streq (mntents[done-2].mnt_dir, "/NONROOT"))
mntents[done-2].mnt_dir = nonroot_fs;
if (streq (mntents[done-2].mnt_dir, "/REMOTE"))
{
if (!remote_fs || !*remote_fs)
continue;
else
mntents[done-2].mnt_dir = remote_fs;
}
return &mntents[done-2];
}
return NULL;
}
EOF
# Then compile/link it:
gcc_shared_ k.c k.so \
|| skip_ 'failed to build mntent shared library'
# Test if LD_PRELOAD works:
LD_PRELOAD=$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 entries
# having the same device number; thus the output should
# consist of a header and unique entries.
LD_PRELOAD=$LD_PRELOAD:./k.so df -T >out || fail=1
test $(wc -l <out) -eq $(expr 1 + $unique_entries) || { fail=1; cat out; }
# With --total we should suppress the duplicate but separate remote file system
LD_PRELOAD=$LD_PRELOAD:./k.so df --total >out || fail=1
test "$CU_REMOTE_FS" && elide_remote=1 || elide_remote=0
test $(wc -l <out) -eq $(expr 2 + $unique_entries - $elide_remote) ||
{ fail=1; cat out; }
# Ensure we don't fail when unable to stat (currently) unavailable entries
LD_PRELOAD=$LD_PRELOAD:./k.so CU_TEST_DUPE_INVALID=1 df -T >out || fail=1
test $(wc -l <out) -eq $(expr 1 + $unique_entries) || { fail=1; cat out; }
# df should also prefer "/fsname" over "fsname"
if test "$unique_entries" = 2; then
test $(grep -c '/fsname' <out) -eq 1 || { fail=1; cat out; }
# ... and "/fsname" with '/' as Mounted on over '/.'
test $(grep -cF '/.' <out) -eq 0 || { fail=1; cat out; }
fi
# df should use the last seen devname (mnt_fsname) and devtype (mnt_type)
test $(grep -c 'virtfs2.*t2' <out) -eq 1 || { fail=1; cat out; }
# Ensure that filtering duplicates does not affect -a processing.
LD_PRELOAD=$LD_PRELOAD:./k.so df -a >out || fail=1
total_fs=6; test "$CU_REMOTE_FS" && total_fs=$(expr $total_fs + 3)
test $(wc -l <out) -eq $total_fs || { fail=1; cat out; }
# Ensure placeholder "-" values used for the eclipsed "virtfs"
test $(grep -c 'virtfs *-' <out) -eq 1 || { fail=1; cat out; }
# Ensure that filtering duplicates 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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