1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
|
#!/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) 2012-2018 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_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 an mtab file to test various cases.
cat > k.c <<EOF || framework_failure_
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.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);
}
#define STREQ(a, b) (strcmp (a, b) == 0)
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 ("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 \
|| framework_failure_ 'failed to build 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
|
