src/test/test-fs-util.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <unistd.h>
   4
   5 #include "alloc-util.h"
   6 #include "fd-util.h"
   7 #include "fd-util.h"
   8 #include "fileio.h"
   9 #include "fs-util.h"
  10 #include "id128-util.h"
  11 #include "macro.h"
  12 #include "mkdir.h"
  13 #include "path-util.h"
  14 #include "rm-rf.h"
  15 #include "stdio-util.h"
  16 #include "string-util.h"
  17 #include "strv.h"
  18 #include "user-util.h"
  19 #include "util.h"
  20
  21 static void test_chase_symlinks(void) {
  22         _cleanup_free_ char *result = NULL;
  23         char temp[] = "/tmp/test-chase.XXXXXX";
  24         const char *top, *p, *pslash, *q, *qslash;
  25         int r, pfd;
  26
  27         assert_se(mkdtemp(temp));
  28
  29         top = strjoina(temp, "/top");
  30         assert_se(mkdir(top, 0700) >= 0);
  31
  32         p = strjoina(top, "/dot");
  33         assert_se(symlink(".", p) >= 0);
  34
  35         p = strjoina(top, "/dotdot");
  36         assert_se(symlink("..", p) >= 0);
  37
  38         p = strjoina(top, "/dotdota");
  39         assert_se(symlink("../a", p) >= 0);
  40
  41         p = strjoina(temp, "/a");
  42         assert_se(symlink("b", p) >= 0);
  43
  44         p = strjoina(temp, "/b");
  45         assert_se(symlink("/usr", p) >= 0);
  46
  47         p = strjoina(temp, "/start");
  48         assert_se(symlink("top/dot/dotdota", p) >= 0);
  49
  50         /* Paths that use symlinks underneath the "root" */
  51
  52         r = chase_symlinks(p, NULL, 0, &result);
  53         assert_se(r > 0);
  54         assert_se(path_equal(result, "/usr"));
  55         result = mfree(result);
  56
  57         pslash = strjoina(p, "/");
  58         r = chase_symlinks(pslash, NULL, 0, &result);
  59         assert_se(r > 0);
  60         assert_se(path_equal(result, "/usr/"));
  61         result = mfree(result);
  62
  63         r = chase_symlinks(p, temp, 0, &result);
  64         assert_se(r == -ENOENT);
  65
  66         r = chase_symlinks(pslash, temp, 0, &result);
  67         assert_se(r == -ENOENT);
  68
  69         q = strjoina(temp, "/usr");
  70
  71         r = chase_symlinks(p, temp, CHASE_NONEXISTENT, &result);
  72         assert_se(r == 0);
  73         assert_se(path_equal(result, q));
  74         result = mfree(result);
  75
  76         qslash = strjoina(q, "/");
  77
  78         r = chase_symlinks(pslash, temp, CHASE_NONEXISTENT, &result);
  79         assert_se(r == 0);
  80         assert_se(path_equal(result, qslash));
  81         result = mfree(result);
  82
  83         assert_se(mkdir(q, 0700) >= 0);
  84
  85         r = chase_symlinks(p, temp, 0, &result);
  86         assert_se(r > 0);
  87         assert_se(path_equal(result, q));
  88         result = mfree(result);
  89
  90         r = chase_symlinks(pslash, temp, 0, &result);
  91         assert_se(r > 0);
  92         assert_se(path_equal(result, qslash));
  93         result = mfree(result);
  94
  95         p = strjoina(temp, "/slash");
  96         assert_se(symlink("/", p) >= 0);
  97
  98         r = chase_symlinks(p, NULL, 0, &result);
  99         assert_se(r > 0);
 100         assert_se(path_equal(result, "/"));
 101         result = mfree(result);
 102
 103         r = chase_symlinks(p, temp, 0, &result);
 104         assert_se(r > 0);
 105         assert_se(path_equal(result, temp));
 106         result = mfree(result);
 107
 108         /* Paths that would "escape" outside of the "root" */
 109
 110         p = strjoina(temp, "/6dots");
 111         assert_se(symlink("../../..", p) >= 0);
 112
 113         r = chase_symlinks(p, temp, 0, &result);
 114         assert_se(r > 0 && path_equal(result, temp));
 115         result = mfree(result);
 116
 117         p = strjoina(temp, "/6dotsusr");
 118         assert_se(symlink("../../../usr", p) >= 0);
 119
 120         r = chase_symlinks(p, temp, 0, &result);
 121         assert_se(r > 0 && path_equal(result, q));
 122         result = mfree(result);
 123
 124         p = strjoina(temp, "/top/8dotsusr");
 125         assert_se(symlink("../../../../usr", p) >= 0);
 126
 127         r = chase_symlinks(p, temp, 0, &result);
 128         assert_se(r > 0 && path_equal(result, q));
 129         result = mfree(result);
 130
 131         /* Paths that contain repeated slashes */
 132
 133         p = strjoina(temp, "/slashslash");
 134         assert_se(symlink("///usr///", p) >= 0);
 135
 136         r = chase_symlinks(p, NULL, 0, &result);
 137         assert_se(r > 0);
 138         assert_se(path_equal(result, "/usr"));
 139         result = mfree(result);
 140
 141         r = chase_symlinks(p, temp, 0, &result);
 142         assert_se(r > 0);
 143         assert_se(path_equal(result, q));
 144         result = mfree(result);
 145
 146         /* Paths using . */
 147
 148         r = chase_symlinks("/etc/./.././", NULL, 0, &result);
 149         assert_se(r > 0);
 150         assert_se(path_equal(result, "/"));
 151         result = mfree(result);
 152
 153         r = chase_symlinks("/etc/./.././", "/etc", 0, &result);
 154         assert_se(r > 0 && path_equal(result, "/etc"));
 155         result = mfree(result);
 156
 157         r = chase_symlinks("/../.././//../../etc", NULL, 0, &result);
 158         assert_se(r > 0);
 159         assert_se(streq(result, "/etc"));
 160         result = mfree(result);
 161
 162         r = chase_symlinks("/../.././//../../test-chase.fsldajfl", NULL, CHASE_NONEXISTENT, &result);
 163         assert_se(r == 0);
 164         assert_se(streq(result, "/test-chase.fsldajfl"));
 165         result = mfree(result);
 166
 167         r = chase_symlinks("/../.././//../../etc", "/", CHASE_PREFIX_ROOT, &result);
 168         assert_se(r > 0);
 169         assert_se(streq(result, "/etc"));
 170         result = mfree(result);
 171
 172         r = chase_symlinks("/../.././//../../test-chase.fsldajfl", "/", CHASE_PREFIX_ROOT|CHASE_NONEXISTENT, &result);
 173         assert_se(r == 0);
 174         assert_se(streq(result, "/test-chase.fsldajfl"));
 175         result = mfree(result);
 176
 177         r = chase_symlinks("/etc/machine-id/foo", NULL, 0, &result);
 178         assert_se(r == -ENOTDIR);
 179         result = mfree(result);
 180
 181         /* Path that loops back to self */
 182
 183         p = strjoina(temp, "/recursive-symlink");
 184         assert_se(symlink("recursive-symlink", p) >= 0);
 185         r = chase_symlinks(p, NULL, 0, &result);
 186         assert_se(r == -ELOOP);
 187
 188         /* Path which doesn't exist */
 189
 190         p = strjoina(temp, "/idontexist");
 191         r = chase_symlinks(p, NULL, 0, &result);
 192         assert_se(r == -ENOENT);
 193
 194         r = chase_symlinks(p, NULL, CHASE_NONEXISTENT, &result);
 195         assert_se(r == 0);
 196         assert_se(path_equal(result, p));
 197         result = mfree(result);
 198
 199         p = strjoina(temp, "/idontexist/meneither");
 200         r = chase_symlinks(p, NULL, 0, &result);
 201         assert_se(r == -ENOENT);
 202
 203         r = chase_symlinks(p, NULL, CHASE_NONEXISTENT, &result);
 204         assert_se(r == 0);
 205         assert_se(path_equal(result, p));
 206         result = mfree(result);
 207
 208         /* Path which doesn't exist, but contains weird stuff */
 209
 210         p = strjoina(temp, "/idontexist/..");
 211         r = chase_symlinks(p, NULL, 0, &result);
 212         assert_se(r == -ENOENT);
 213
 214         r = chase_symlinks(p, NULL, CHASE_NONEXISTENT, &result);
 215         assert_se(r == -ENOENT);
 216
 217         p = strjoina(temp, "/target");
 218         q = strjoina(temp, "/top");
 219         assert_se(symlink(q, p) >= 0);
 220         p = strjoina(temp, "/target/idontexist");
 221         r = chase_symlinks(p, NULL, 0, &result);
 222         assert_se(r == -ENOENT);
 223
 224         if (geteuid() == 0) {
 225                 p = strjoina(temp, "/priv1");
 226                 assert_se(mkdir(p, 0755) >= 0);
 227
 228                 q = strjoina(p, "/priv2");
 229                 assert_se(mkdir(q, 0755) >= 0);
 230
 231                 assert_se(chase_symlinks(q, NULL, CHASE_SAFE, NULL) >= 0);
 232
 233                 assert_se(chown(q, UID_NOBODY, GID_NOBODY) >= 0);
 234                 assert_se(chase_symlinks(q, NULL, CHASE_SAFE, NULL) >= 0);
 235
 236                 assert_se(chown(p, UID_NOBODY, GID_NOBODY) >= 0);
 237                 assert_se(chase_symlinks(q, NULL, CHASE_SAFE, NULL) >= 0);
 238
 239                 assert_se(chown(q, 0, 0) >= 0);
 240                 assert_se(chase_symlinks(q, NULL, CHASE_SAFE, NULL) == -EPERM);
 241
 242                 assert_se(rmdir(q) >= 0);
 243                 assert_se(symlink("/etc/passwd", q) >= 0);
 244                 assert_se(chase_symlinks(q, NULL, CHASE_SAFE, NULL) == -EPERM);
 245
 246                 assert_se(chown(p, 0, 0) >= 0);
 247                 assert_se(chase_symlinks(q, NULL, CHASE_SAFE, NULL) >= 0);
 248         }
 249
 250         p = strjoina(temp, "/machine-id-test");
 251         assert_se(symlink("/usr/../etc/./machine-id", p) >= 0);
 252
 253         pfd = chase_symlinks(p, NULL, CHASE_OPEN, NULL);
 254         if (pfd != -ENOENT) {
 255                 _cleanup_close_ int fd = -1;
 256                 sd_id128_t a, b;
 257
 258                 assert_se(pfd >= 0);
 259
 260                 fd = fd_reopen(pfd, O_RDONLY|O_CLOEXEC);
 261                 assert_se(fd >= 0);
 262                 safe_close(pfd);
 263
 264                 assert_se(id128_read_fd(fd, ID128_PLAIN, &a) >= 0);
 265                 assert_se(sd_id128_get_machine(&b) >= 0);
 266                 assert_se(sd_id128_equal(a, b));
 267         }
 268
 269         /* Test CHASE_ONE */
 270
 271         p = strjoina(temp, "/start");
 272         r = chase_symlinks(p, NULL, CHASE_STEP, &result);
 273         assert_se(r == 0);
 274         p = strjoina(temp, "/top/dot/dotdota");
 275         assert_se(streq(p, result));
 276         result = mfree(result);
 277
 278         r = chase_symlinks(p, NULL, CHASE_STEP, &result);
 279         assert_se(r == 0);
 280         p = strjoina(temp, "/top/./dotdota");
 281         assert_se(streq(p, result));
 282         result = mfree(result);
 283
 284         r = chase_symlinks(p, NULL, CHASE_STEP, &result);
 285         assert_se(r == 0);
 286         p = strjoina(temp, "/top/../a");
 287         assert_se(streq(p, result));
 288         result = mfree(result);
 289
 290         r = chase_symlinks(p, NULL, CHASE_STEP, &result);
 291         assert_se(r == 0);
 292         p = strjoina(temp, "/a");
 293         assert_se(streq(p, result));
 294         result = mfree(result);
 295
 296         r = chase_symlinks(p, NULL, CHASE_STEP, &result);
 297         assert_se(r == 0);
 298         p = strjoina(temp, "/b");
 299         assert_se(streq(p, result));
 300         result = mfree(result);
 301
 302         r = chase_symlinks(p, NULL, CHASE_STEP, &result);
 303         assert_se(r == 0);
 304         assert_se(streq("/usr", result));
 305         result = mfree(result);
 306
 307         r = chase_symlinks("/usr", NULL, CHASE_STEP, &result);
 308         assert_se(r > 0);
 309         assert_se(streq("/usr", result));
 310         result = mfree(result);
 311
 312         assert_se(rm_rf(temp, REMOVE_ROOT|REMOVE_PHYSICAL) >= 0);
 313 }
 314
 315 static void test_unlink_noerrno(void) {
 316         char name[] = "/tmp/test-close_nointr.XXXXXX";
 317         int fd;
 318
 319         fd = mkostemp_safe(name);
 320         assert_se(fd >= 0);
 321         assert_se(close_nointr(fd) >= 0);
 322
 323         {
 324                 PROTECT_ERRNO;
 325                 errno = -42;
 326                 assert_se(unlink_noerrno(name) >= 0);
 327                 assert_se(errno == -42);
 328                 assert_se(unlink_noerrno(name) < 0);
 329                 assert_se(errno == -42);
 330         }
 331 }
 332
 333 static void test_readlink_and_make_absolute(void) {
 334         char tempdir[] = "/tmp/test-readlink_and_make_absolute";
 335         char name[] = "/tmp/test-readlink_and_make_absolute/original";
 336         char name2[] = "test-readlink_and_make_absolute/original";
 337         char name_alias[] = "/tmp/test-readlink_and_make_absolute-alias";
 338         char *r = NULL;
 339         _cleanup_free_ char *pwd = NULL;
 340
 341         assert_se(mkdir_safe(tempdir, 0755, getuid(), getgid(), MKDIR_WARN_MODE) >= 0);
 342         assert_se(touch(name) >= 0);
 343
 344         assert_se(symlink(name, name_alias) >= 0);
 345         assert_se(readlink_and_make_absolute(name_alias, &r) >= 0);
 346         assert_se(streq(r, name));
 347         free(r);
 348         assert_se(unlink(name_alias) >= 0);
 349
 350         assert_se(safe_getcwd(&pwd) >= 0);
 351
 352         assert_se(chdir(tempdir) >= 0);
 353         assert_se(symlink(name2, name_alias) >= 0);
 354         assert_se(readlink_and_make_absolute(name_alias, &r) >= 0);
 355         assert_se(streq(r, name));
 356         free(r);
 357         assert_se(unlink(name_alias) >= 0);
 358
 359         assert_se(chdir(pwd) >= 0);
 360
 361         assert_se(rm_rf(tempdir, REMOVE_ROOT|REMOVE_PHYSICAL) >= 0);
 362 }
 363
 364 static void test_get_files_in_directory(void) {
 365         _cleanup_strv_free_ char **l = NULL, **t = NULL;
 366
 367         assert_se(get_files_in_directory("/tmp", &l) >= 0);
 368         assert_se(get_files_in_directory(".", &t) >= 0);
 369         assert_se(get_files_in_directory(".", NULL) >= 0);
 370 }
 371
 372 static void test_var_tmp(void) {
 373         _cleanup_free_ char *tmpdir_backup = NULL, *temp_backup = NULL, *tmp_backup = NULL;
 374         const char *tmp_dir = NULL, *t;
 375
 376         t = getenv("TMPDIR");
 377         if (t) {
 378                 tmpdir_backup = strdup(t);
 379                 assert_se(tmpdir_backup);
 380         }
 381
 382         t = getenv("TEMP");
 383         if (t) {
 384                 temp_backup = strdup(t);
 385                 assert_se(temp_backup);
 386         }
 387
 388         t = getenv("TMP");
 389         if (t) {
 390                 tmp_backup = strdup(t);
 391                 assert_se(tmp_backup);
 392         }
 393
 394         assert_se(unsetenv("TMPDIR") >= 0);
 395         assert_se(unsetenv("TEMP") >= 0);
 396         assert_se(unsetenv("TMP") >= 0);
 397
 398         assert_se(var_tmp_dir(&tmp_dir) >= 0);
 399         assert_se(streq(tmp_dir, "/var/tmp"));
 400
 401         assert_se(setenv("TMPDIR", "/tmp", true) >= 0);
 402         assert_se(streq(getenv("TMPDIR"), "/tmp"));
 403
 404         assert_se(var_tmp_dir(&tmp_dir) >= 0);
 405         assert_se(streq(tmp_dir, "/tmp"));
 406
 407         assert_se(setenv("TMPDIR", "/88_does_not_exist_88", true) >= 0);
 408         assert_se(streq(getenv("TMPDIR"), "/88_does_not_exist_88"));
 409
 410         assert_se(var_tmp_dir(&tmp_dir) >= 0);
 411         assert_se(streq(tmp_dir, "/var/tmp"));
 412
 413         if (tmpdir_backup)  {
 414                 assert_se(setenv("TMPDIR", tmpdir_backup, true) >= 0);
 415                 assert_se(streq(getenv("TMPDIR"), tmpdir_backup));
 416         }
 417
 418         if (temp_backup)  {
 419                 assert_se(setenv("TEMP", temp_backup, true) >= 0);
 420                 assert_se(streq(getenv("TEMP"), temp_backup));
 421         }
 422
 423         if (tmp_backup)  {
 424                 assert_se(setenv("TMP", tmp_backup, true) >= 0);
 425                 assert_se(streq(getenv("TMP"), tmp_backup));
 426         }
 427 }
 428
 429 static void test_dot_or_dot_dot(void) {
 430         assert_se(!dot_or_dot_dot(NULL));
 431         assert_se(!dot_or_dot_dot(""));
 432         assert_se(!dot_or_dot_dot("xxx"));
 433         assert_se(dot_or_dot_dot("."));
 434         assert_se(dot_or_dot_dot(".."));
 435         assert_se(!dot_or_dot_dot(".foo"));
 436         assert_se(!dot_or_dot_dot("..foo"));
 437 }
 438
 439 static void test_access_fd(void) {
 440         _cleanup_(rmdir_and_freep) char *p = NULL;
 441         _cleanup_close_ int fd = -1;
 442
 443         assert_se(mkdtemp_malloc("/tmp/access-fd.XXXXXX", &p) >= 0);
 444
 445         fd = open(p, O_RDONLY|O_DIRECTORY|O_CLOEXEC);
 446         assert_se(fd >= 0);
 447
 448         assert_se(access_fd(fd, R_OK) >= 0);
 449         assert_se(access_fd(fd, F_OK) >= 0);
 450         assert_se(access_fd(fd, W_OK) >= 0);
 451
 452         assert_se(fchmod(fd, 0000) >= 0);
 453
 454         assert_se(access_fd(fd, F_OK) >= 0);
 455
 456         if (geteuid() == 0) {
 457                 assert_se(access_fd(fd, R_OK) >= 0);
 458                 assert_se(access_fd(fd, W_OK) >= 0);
 459         } else {
 460                 assert_se(access_fd(fd, R_OK) == -EACCES);
 461                 assert_se(access_fd(fd, W_OK) == -EACCES);
 462         }
 463 }
 464
 465 static void test_touch_file(void) {
 466         uid_t test_uid, test_gid;
 467         _cleanup_(rm_rf_physical_and_freep) char *p = NULL;
 468         struct stat st;
 469         const char *a;
 470         usec_t test_mtime;
 471
 472         test_uid = geteuid() == 0 ? 65534 : getuid();
 473         test_gid = geteuid() == 0 ? 65534 : getgid();
 474
 475         test_mtime = usec_sub_unsigned(now(CLOCK_REALTIME), USEC_PER_WEEK);
 476
 477         assert_se(mkdtemp_malloc("/dev/shm/touch-file-XXXXXX", &p) >= 0);
 478
 479         a = strjoina(p, "/regular");
 480         assert_se(touch_file(a, false, test_mtime, test_uid, test_gid, 0640) >= 0);
 481         assert_se(lstat(a, &st) >= 0);
 482         assert_se(st.st_uid == test_uid);
 483         assert_se(st.st_gid == test_gid);
 484         assert_se(S_ISREG(st.st_mode));
 485         assert_se((st.st_mode & 0777) == 0640);
 486         assert_se(timespec_load(&st.st_mtim) == test_mtime);
 487
 488         a = strjoina(p, "/dir");
 489         assert_se(mkdir(a, 0775) >= 0);
 490         assert_se(touch_file(a, false, test_mtime, test_uid, test_gid, 0640) >= 0);
 491         assert_se(lstat(a, &st) >= 0);
 492         assert_se(st.st_uid == test_uid);
 493         assert_se(st.st_gid == test_gid);
 494         assert_se(S_ISDIR(st.st_mode));
 495         assert_se((st.st_mode & 0777) == 0640);
 496         assert_se(timespec_load(&st.st_mtim) == test_mtime);
 497
 498         a = strjoina(p, "/fifo");
 499         assert_se(mkfifo(a, 0775) >= 0);
 500         assert_se(touch_file(a, false, test_mtime, test_uid, test_gid, 0640) >= 0);
 501         assert_se(lstat(a, &st) >= 0);
 502         assert_se(st.st_uid == test_uid);
 503         assert_se(st.st_gid == test_gid);
 504         assert_se(S_ISFIFO(st.st_mode));
 505         assert_se((st.st_mode & 0777) == 0640);
 506         assert_se(timespec_load(&st.st_mtim) == test_mtime);
 507
 508         a = strjoina(p, "/sock");
 509         assert_se(mknod(a, 0775 | S_IFSOCK, 0) >= 0);
 510         assert_se(touch_file(a, false, test_mtime, test_uid, test_gid, 0640) >= 0);
 511         assert_se(lstat(a, &st) >= 0);
 512         assert_se(st.st_uid == test_uid);
 513         assert_se(st.st_gid == test_gid);
 514         assert_se(S_ISSOCK(st.st_mode));
 515         assert_se((st.st_mode & 0777) == 0640);
 516         assert_se(timespec_load(&st.st_mtim) == test_mtime);
 517
 518         if (geteuid() == 0) {
 519                 a = strjoina(p, "/cdev");
 520                 assert_se(mknod(a, 0775 | S_IFCHR, makedev(0, 0)) >= 0);
 521                 assert_se(touch_file(a, false, test_mtime, test_uid, test_gid, 0640) >= 0);
 522                 assert_se(lstat(a, &st) >= 0);
 523                 assert_se(st.st_uid == test_uid);
 524                 assert_se(st.st_gid == test_gid);
 525                 assert_se(S_ISCHR(st.st_mode));
 526                 assert_se((st.st_mode & 0777) == 0640);
 527                 assert_se(timespec_load(&st.st_mtim) == test_mtime);
 528
 529                 a = strjoina(p, "/bdev");
 530                 assert_se(mknod(a, 0775 | S_IFBLK, makedev(0, 0)) >= 0);
 531                 assert_se(touch_file(a, false, test_mtime, test_uid, test_gid, 0640) >= 0);
 532                 assert_se(lstat(a, &st) >= 0);
 533                 assert_se(st.st_uid == test_uid);
 534                 assert_se(st.st_gid == test_gid);
 535                 assert_se(S_ISBLK(st.st_mode));
 536                 assert_se((st.st_mode & 0777) == 0640);
 537                 assert_se(timespec_load(&st.st_mtim) == test_mtime);
 538         }
 539
 540         a = strjoina(p, "/lnk");
 541         assert_se(symlink("target", a) >= 0);
 542         assert_se(touch_file(a, false, test_mtime, test_uid, test_gid, 0640) >= 0);
 543         assert_se(lstat(a, &st) >= 0);
 544         assert_se(st.st_uid == test_uid);
 545         assert_se(st.st_gid == test_gid);
 546         assert_se(S_ISLNK(st.st_mode));
 547         assert_se((st.st_mode & 0777) == 0640);
 548         assert_se(timespec_load(&st.st_mtim) == test_mtime);
 549 }
 550
 551 static void test_unlinkat_deallocate(void) {
 552         _cleanup_free_ char *p = NULL;
 553         _cleanup_close_ int fd = -1;
 554         struct stat st;
 555
 556         assert_se(tempfn_random_child(NULL, "unlink-deallocation", &p) >= 0);
 557
 558         fd = open(p, O_WRONLY|O_CLOEXEC|O_CREAT|O_EXCL, 0600);
 559         assert_se(fd >= 0);
 560
 561         assert_se(write(fd, "hallo\n", 6) == 6);
 562
 563         assert_se(fstat(fd, &st) >= 0);
 564         assert_se(st.st_size == 6);
 565         assert_se(st.st_blocks > 0);
 566         assert_se(st.st_nlink == 1);
 567
 568         assert_se(unlinkat_deallocate(AT_FDCWD, p, 0) >= 0);
 569
 570         assert_se(fstat(fd, &st) >= 0);
 571         assert_se(IN_SET(st.st_size, 0, 6)); /* depending on whether hole punching worked the size will be 6 (it worked) or 0 (we had to resort to truncation) */
 572         assert_se(st.st_blocks == 0);
 573         assert_se(st.st_nlink == 0);
 574 }
 575
 576 static void test_fsync_directory_of_file(void) {
 577         _cleanup_close_ int fd = -1;
 578
 579         fd = open_tmpfile_unlinkable(NULL, O_RDWR);
 580         assert_se(fd >= 0);
 581
 582         assert_se(fsync_directory_of_file(fd) >= 0);
 583 }
 584
 585 int main(int argc, char *argv[]) {
 586         test_unlink_noerrno();
 587         test_get_files_in_directory();
 588         test_readlink_and_make_absolute();
 589         test_var_tmp();
 590         test_chase_symlinks();
 591         test_dot_or_dot_dot();
 592         test_access_fd();
 593         test_touch_file();
 594         test_unlinkat_deallocate();
 595         test_fsync_directory_of_file();
 596
 597         return 0;
 598 }