[thirdparty/systemd.git] / src / test / test-mountpoint-util.c

/* SPDX-License-Identifier: LGPL-2.1-or-later */

#include <sched.h>
#include <sys/mount.h>
#include <unistd.h>

#include "alloc-util.h"
#include "def.h"
#include "fd-util.h"
#include "fileio.h"
#include "hashmap.h"
#include "log.h"
#include "mountpoint-util.h"
#include "path-util.h"
#include "rm-rf.h"
#include "string-util.h"
#include "tests.h"

static void test_mount_propagation_flags(const char *name, int ret, unsigned long expected) {
        long unsigned flags;

        log_info("/* %s(%s) */", __func__, name);

        assert_se(mount_propagation_flags_from_string(name, &flags) == ret);

        if (ret >= 0) {
                const char *c;

                assert_se(flags == expected);

                c = mount_propagation_flags_to_string(flags);
                if (isempty(name))
                        assert_se(isempty(c));
                else
                        assert_se(streq(c, name));
        }
}

static void test_mnt_id(void) {
        _cleanup_fclose_ FILE *f = NULL;
        _cleanup_hashmap_free_free_ Hashmap *h = NULL;
        char *p;
        void *k;
        int r;

        log_info("/* %s */", __func__);

        assert_se(f = fopen("/proc/self/mountinfo", "re"));
        assert_se(h = hashmap_new(&trivial_hash_ops));

        for (;;) {
                _cleanup_free_ char *line = NULL, *path = NULL;
                int mnt_id;

                r = read_line(f, LONG_LINE_MAX, &line);
                if (r == 0)
                        break;
                assert_se(r > 0);

                assert_se(sscanf(line, "%i %*s %*s %*s %ms", &mnt_id, &path) == 2);
#if HAS_FEATURE_MEMORY_SANITIZER
                /* We don't know the length of the string, so we need to unpoison it one char at a time */
                for (const char *c = path; ;c++) {
                        msan_unpoison(c, 1);
                        if (!*c)
                                break;
                }
#endif
                log_debug("mountinfo: %s → %i", path, mnt_id);

                assert_se(hashmap_put(h, INT_TO_PTR(mnt_id), path) >= 0);
                path = NULL;
        }

        HASHMAP_FOREACH_KEY(p, k, h) {
                int mnt_id = PTR_TO_INT(k), mnt_id2;

                r = path_get_mnt_id(p, &mnt_id2);
                if (r < 0) {
                        log_debug_errno(r, "Failed to get the mnt id of %s: %m\n", p);
                        continue;
                }

                if (mnt_id == mnt_id2) {
                        log_debug("mnt ids of %s is %i\n", p, mnt_id);
                        continue;
                } else
                        log_debug("mnt ids of %s are %i, %i\n", p, mnt_id, mnt_id2);

                /* The ids don't match? If so, then there are two mounts on the same path, let's check if
                 * that's really the case */
                char *t = hashmap_get(h, INT_TO_PTR(mnt_id2));
                log_debug("the other path for mnt id %i is %s\n", mnt_id2, t);
                assert_se(path_equal(p, t));
        }
}

static void test_path_is_mount_point(void) {
        int fd;
        char tmp_dir[] = "/tmp/test-path-is-mount-point-XXXXXX";
        _cleanup_free_ char *file1 = NULL, *file2 = NULL, *link1 = NULL, *link2 = NULL;
        _cleanup_free_ char *dir1 = NULL, *dir1file = NULL, *dirlink1 = NULL, *dirlink1file = NULL;
        _cleanup_free_ char *dir2 = NULL, *dir2file = NULL;

        log_info("/* %s */", __func__);

        assert_se(path_is_mount_point("/", NULL, AT_SYMLINK_FOLLOW) > 0);
        assert_se(path_is_mount_point("/", NULL, 0) > 0);
        assert_se(path_is_mount_point("//", NULL, AT_SYMLINK_FOLLOW) > 0);
        assert_se(path_is_mount_point("//", NULL, 0) > 0);

        assert_se(path_is_mount_point("/proc", NULL, AT_SYMLINK_FOLLOW) > 0);
        assert_se(path_is_mount_point("/proc", NULL, 0) > 0);
        assert_se(path_is_mount_point("/proc/", NULL, AT_SYMLINK_FOLLOW) > 0);
        assert_se(path_is_mount_point("/proc/", NULL, 0) > 0);

        assert_se(path_is_mount_point("/proc/1", NULL, AT_SYMLINK_FOLLOW) == 0);
        assert_se(path_is_mount_point("/proc/1", NULL, 0) == 0);
        assert_se(path_is_mount_point("/proc/1/", NULL, AT_SYMLINK_FOLLOW) == 0);
        assert_se(path_is_mount_point("/proc/1/", NULL, 0) == 0);

        assert_se(path_is_mount_point("/sys", NULL, AT_SYMLINK_FOLLOW) > 0);
        assert_se(path_is_mount_point("/sys", NULL, 0) > 0);
        assert_se(path_is_mount_point("/sys/", NULL, AT_SYMLINK_FOLLOW) > 0);
        assert_se(path_is_mount_point("/sys/", NULL, 0) > 0);

        /* we'll create a hierarchy of different kinds of dir/file/link
         * layouts:
         *
         * <tmp>/file1, <tmp>/file2
         * <tmp>/link1 -> file1, <tmp>/link2 -> file2
         * <tmp>/dir1/
         * <tmp>/dir1/file
         * <tmp>/dirlink1 -> dir1
         * <tmp>/dirlink1file -> dirlink1/file
         * <tmp>/dir2/
         * <tmp>/dir2/file
         */

        /* file mountpoints */
        assert_se(mkdtemp(tmp_dir) != NULL);
        file1 = path_join(tmp_dir, "file1");
        assert_se(file1);
        file2 = path_join(tmp_dir, "file2");
        assert_se(file2);
        fd = open(file1, O_WRONLY|O_CREAT|O_EXCL|O_CLOEXEC, 0664);
        assert_se(fd > 0);
        close(fd);
        fd = open(file2, O_WRONLY|O_CREAT|O_EXCL|O_CLOEXEC, 0664);
        assert_se(fd > 0);
        close(fd);
        link1 = path_join(tmp_dir, "link1");
        assert_se(link1);
        assert_se(symlink("file1", link1) == 0);
        link2 = path_join(tmp_dir, "link2");
        assert_se(link1);
        assert_se(symlink("file2", link2) == 0);

        assert_se(path_is_mount_point(file1, NULL, AT_SYMLINK_FOLLOW) == 0);
        assert_se(path_is_mount_point(file1, NULL, 0) == 0);
        assert_se(path_is_mount_point(link1, NULL, AT_SYMLINK_FOLLOW) == 0);
        assert_se(path_is_mount_point(link1, NULL, 0) == 0);

        /* directory mountpoints */
        dir1 = path_join(tmp_dir, "dir1");
        assert_se(dir1);
        assert_se(mkdir(dir1, 0755) == 0);
        dirlink1 = path_join(tmp_dir, "dirlink1");
        assert_se(dirlink1);
        assert_se(symlink("dir1", dirlink1) == 0);
        dirlink1file = path_join(tmp_dir, "dirlink1file");
        assert_se(dirlink1file);
        assert_se(symlink("dirlink1/file", dirlink1file) == 0);
        dir2 = path_join(tmp_dir, "dir2");
        assert_se(dir2);
        assert_se(mkdir(dir2, 0755) == 0);

        assert_se(path_is_mount_point(dir1, NULL, AT_SYMLINK_FOLLOW) == 0);
        assert_se(path_is_mount_point(dir1, NULL, 0) == 0);
        assert_se(path_is_mount_point(dirlink1, NULL, AT_SYMLINK_FOLLOW) == 0);
        assert_se(path_is_mount_point(dirlink1, NULL, 0) == 0);

        /* file in subdirectory mountpoints */
        dir1file = path_join(dir1, "file");
        assert_se(dir1file);
        fd = open(dir1file, O_WRONLY|O_CREAT|O_EXCL|O_CLOEXEC, 0664);
        assert_se(fd > 0);
        close(fd);

        assert_se(path_is_mount_point(dir1file, NULL, AT_SYMLINK_FOLLOW) == 0);
        assert_se(path_is_mount_point(dir1file, NULL, 0) == 0);
        assert_se(path_is_mount_point(dirlink1file, NULL, AT_SYMLINK_FOLLOW) == 0);
        assert_se(path_is_mount_point(dirlink1file, NULL, 0) == 0);

        /* these tests will only work as root */
        if (mount(file1, file2, NULL, MS_BIND, NULL) >= 0) {
                int rf, rt, rdf, rdt, rlf, rlt, rl1f, rl1t;
                const char *file2d;

                /* files */
                /* capture results in vars, to avoid dangling mounts on failure */
                log_info("%s: %s", __func__, file2);
                rf = path_is_mount_point(file2, NULL, 0);
                rt = path_is_mount_point(file2, NULL, AT_SYMLINK_FOLLOW);

                file2d = strjoina(file2, "/");
                log_info("%s: %s", __func__, file2d);
                rdf = path_is_mount_point(file2d, NULL, 0);
                rdt = path_is_mount_point(file2d, NULL, AT_SYMLINK_FOLLOW);

                log_info("%s: %s", __func__, link2);
                rlf = path_is_mount_point(link2, NULL, 0);
                rlt = path_is_mount_point(link2, NULL, AT_SYMLINK_FOLLOW);

                assert_se(umount(file2) == 0);

                assert_se(rf == 1);
                assert_se(rt == 1);
                assert_se(rdf == -ENOTDIR);
                assert_se(rdt == -ENOTDIR);
                assert_se(rlf == 0);
                assert_se(rlt == 1);

                /* dirs */
                dir2file = path_join(dir2, "file");
                assert_se(dir2file);
                fd = open(dir2file, O_WRONLY|O_CREAT|O_EXCL|O_CLOEXEC, 0664);
                assert_se(fd > 0);
                close(fd);

                assert_se(mount(dir2, dir1, NULL, MS_BIND, NULL) >= 0);

                log_info("%s: %s", __func__, dir1);
                rf = path_is_mount_point(dir1, NULL, 0);
                rt = path_is_mount_point(dir1, NULL, AT_SYMLINK_FOLLOW);
                log_info("%s: %s", __func__, dirlink1);
                rlf = path_is_mount_point(dirlink1, NULL, 0);
                rlt = path_is_mount_point(dirlink1, NULL, AT_SYMLINK_FOLLOW);
                log_info("%s: %s", __func__, dirlink1file);
                /* its parent is a mount point, but not /file itself */
                rl1f = path_is_mount_point(dirlink1file, NULL, 0);
                rl1t = path_is_mount_point(dirlink1file, NULL, AT_SYMLINK_FOLLOW);

                assert_se(umount(dir1) == 0);

                assert_se(rf == 1);
                assert_se(rt == 1);
                assert_se(rlf == 0);
                assert_se(rlt == 1);
                assert_se(rl1f == 0);
                assert_se(rl1t == 0);

        } else
                printf("Skipping bind mount file test: %m\n");

        assert_se(rm_rf(tmp_dir, REMOVE_ROOT|REMOVE_PHYSICAL) == 0);
}

int main(int argc, char *argv[]) {
        test_setup_logging(LOG_DEBUG);

        /* let's move into our own mount namespace with all propagation from the host turned off, so that
         * /proc/self/mountinfo is static and constant for the whole time our test runs. */
        if (unshare(CLONE_NEWNS) < 0) {
                if (!ERRNO_IS_PRIVILEGE(errno))
                        return log_error_errno(errno, "Failed to detach mount namespace: %m");

                log_notice("Lacking privilege to create separate mount namespace, proceeding in originating mount namespace.");
        } else
                assert_se(mount(NULL, "/", NULL, MS_PRIVATE | MS_REC, NULL) >= 0);

        test_mount_propagation_flags("shared", 0, MS_SHARED);
        test_mount_propagation_flags("slave", 0, MS_SLAVE);
        test_mount_propagation_flags("private", 0, MS_PRIVATE);
        test_mount_propagation_flags(NULL, 0, 0);
        test_mount_propagation_flags("", 0, 0);
        test_mount_propagation_flags("xxxx", -EINVAL, 0);
        test_mount_propagation_flags(" ", -EINVAL, 0);

        test_mnt_id();
        test_path_is_mount_point();

        return 0;
}
Commit	Line	Data
db9ecf05	1	/* SPDX-License-Identifier: LGPL-2.1-or-later */
049af8ad	2
af918c48	3	#include <sched.h>
049af8ad	4	#include <sys/mount.h>
ca78ad1d	5	#include <unistd.h>
049af8ad ZJS	6
	7	#include "alloc-util.h"
	8	#include "def.h"
	9	#include "fd-util.h"
	10	#include "fileio.h"
	11	#include "hashmap.h"
	12	#include "log.h"
049af8ad ZJS	13	#include "mountpoint-util.h"
	14	#include "path-util.h"
	15	#include "rm-rf.h"
	16	#include "string-util.h"
	17	#include "tests.h"
	18
	19	static void test_mount_propagation_flags(const char *name, int ret, unsigned long expected) {
	20	long unsigned flags;
	21
568ef987 ZJS	22	log_info("/* %s(%s) */", __func__, name);
568ef987 ZJS	23
049af8ad ZJS	24	assert_se(mount_propagation_flags_from_string(name, &flags) == ret);
	25
	26	if (ret >= 0) {
	27	const char *c;
	28
	29	assert_se(flags == expected);
	30
	31	c = mount_propagation_flags_to_string(flags);
	32	if (isempty(name))
	33	assert_se(isempty(c));
	34	else
	35	assert_se(streq(c, name));
	36	}
	37	}
	38
	39	static void test_mnt_id(void) {
	40	_cleanup_fclose_ FILE *f = NULL;
9003da29	41	_cleanup_hashmap_free_free_ Hashmap *h = NULL;
049af8ad ZJS	42	char *p;
	43	void *k;
	44	int r;
	45
568ef987 ZJS	46	log_info("/* %s */", __func__);
568ef987 ZJS	47
049af8ad ZJS	48	assert_se(f = fopen("/proc/self/mountinfo", "re"));
	49	assert_se(h = hashmap_new(&trivial_hash_ops));
	50
	51	for (;;) {
	52	_cleanup_free_ char line = NULL, path = NULL;
	53	int mnt_id;
	54
	55	r = read_line(f, LONG_LINE_MAX, &line);
	56	if (r == 0)
	57	break;
	58	assert_se(r > 0);
	59
	60	assert_se(sscanf(line, "%i %s %s %*s %ms", &mnt_id, &path) == 2);
9003da29 ZJS	61	#if HAS_FEATURE_MEMORY_SANITIZER
	62	/* We don't know the length of the string, so we need to unpoison it one char at a time */
	63	for (const char *c = path; ;c++) {
	64	msan_unpoison(c, 1);
	65	if (!*c)
	66	break;
	67	}
	68	#endif
568ef987 ZJS	69	log_debug("mountinfo: %s → %i", path, mnt_id);
568ef987 ZJS	70
049af8ad ZJS	71	assert_se(hashmap_put(h, INT_TO_PTR(mnt_id), path) >= 0);
	72	path = NULL;
	73	}
	74
90e74a66	75	HASHMAP_FOREACH_KEY(p, k, h) {
049af8ad ZJS	76	int mnt_id = PTR_TO_INT(k), mnt_id2;
	77
	78	r = path_get_mnt_id(p, &mnt_id2);
	79	if (r < 0) {
	80	log_debug_errno(r, "Failed to get the mnt id of %s: %m\n", p);
	81	continue;
	82	}
	83
c569d529 ZJS	84	if (mnt_id == mnt_id2) {
c569d529 ZJS	85	log_debug("mnt ids of %s is %i\n", p, mnt_id);
049af8ad	86	continue;
c569d529 ZJS	87	} else
c569d529 ZJS	88	log_debug("mnt ids of %s are %i, %i\n", p, mnt_id, mnt_id2);
049af8ad	89
568ef987 ZJS	90	/* The ids don't match? If so, then there are two mounts on the same path, let's check if
	91	* that's really the case */
	92	char *t = hashmap_get(h, INT_TO_PTR(mnt_id2));
	93	log_debug("the other path for mnt id %i is %s\n", mnt_id2, t);
	94	assert_se(path_equal(p, t));
049af8ad	95	}
049af8ad ZJS	96	}
	97
	98	static void test_path_is_mount_point(void) {
	99	int fd;
	100	char tmp_dir[] = "/tmp/test-path-is-mount-point-XXXXXX";
	101	_cleanup_free_ char file1 = NULL, file2 = NULL, link1 = NULL, link2 = NULL;
	102	_cleanup_free_ char dir1 = NULL, dir1file = NULL, dirlink1 = NULL, dirlink1file = NULL;
	103	_cleanup_free_ char dir2 = NULL, dir2file = NULL;
	104
568ef987 ZJS	105	log_info("/* %s */", __func__);
568ef987 ZJS	106
049af8ad ZJS	107	assert_se(path_is_mount_point("/", NULL, AT_SYMLINK_FOLLOW) > 0);
	108	assert_se(path_is_mount_point("/", NULL, 0) > 0);
	109	assert_se(path_is_mount_point("//", NULL, AT_SYMLINK_FOLLOW) > 0);
	110	assert_se(path_is_mount_point("//", NULL, 0) > 0);
	111
	112	assert_se(path_is_mount_point("/proc", NULL, AT_SYMLINK_FOLLOW) > 0);
	113	assert_se(path_is_mount_point("/proc", NULL, 0) > 0);
	114	assert_se(path_is_mount_point("/proc/", NULL, AT_SYMLINK_FOLLOW) > 0);
	115	assert_se(path_is_mount_point("/proc/", NULL, 0) > 0);
	116
	117	assert_se(path_is_mount_point("/proc/1", NULL, AT_SYMLINK_FOLLOW) == 0);
	118	assert_se(path_is_mount_point("/proc/1", NULL, 0) == 0);
	119	assert_se(path_is_mount_point("/proc/1/", NULL, AT_SYMLINK_FOLLOW) == 0);
	120	assert_se(path_is_mount_point("/proc/1/", NULL, 0) == 0);
	121
	122	assert_se(path_is_mount_point("/sys", NULL, AT_SYMLINK_FOLLOW) > 0);
	123	assert_se(path_is_mount_point("/sys", NULL, 0) > 0);
	124	assert_se(path_is_mount_point("/sys/", NULL, AT_SYMLINK_FOLLOW) > 0);
	125	assert_se(path_is_mount_point("/sys/", NULL, 0) > 0);
	126
	127	/* we'll create a hierarchy of different kinds of dir/file/link
	128	* layouts:
	129	*
	130	* <tmp>/file1, <tmp>/file2
	131	* <tmp>/link1 -> file1, <tmp>/link2 -> file2
	132	* <tmp>/dir1/
	133	* <tmp>/dir1/file
	134	* <tmp>/dirlink1 -> dir1
	135	* <tmp>/dirlink1file -> dirlink1/file
	136	* <tmp>/dir2/
	137	* <tmp>/dir2/file
	138	*/
	139
	140	/* file mountpoints */
	141	assert_se(mkdtemp(tmp_dir) != NULL);
62a85ee0	142	file1 = path_join(tmp_dir, "file1");
049af8ad	143	assert_se(file1);
62a85ee0	144	file2 = path_join(tmp_dir, "file2");
049af8ad ZJS	145	assert_se(file2);
	146	fd = open(file1, O_WRONLY\|O_CREAT\|O_EXCL\|O_CLOEXEC, 0664);
	147	assert_se(fd > 0);
	148	close(fd);
	149	fd = open(file2, O_WRONLY\|O_CREAT\|O_EXCL\|O_CLOEXEC, 0664);
	150	assert_se(fd > 0);
	151	close(fd);
62a85ee0	152	link1 = path_join(tmp_dir, "link1");
049af8ad ZJS	153	assert_se(link1);
049af8ad ZJS	154	assert_se(symlink("file1", link1) == 0);
62a85ee0	155	link2 = path_join(tmp_dir, "link2");
049af8ad ZJS	156	assert_se(link1);
	157	assert_se(symlink("file2", link2) == 0);
	158
	159	assert_se(path_is_mount_point(file1, NULL, AT_SYMLINK_FOLLOW) == 0);
	160	assert_se(path_is_mount_point(file1, NULL, 0) == 0);
	161	assert_se(path_is_mount_point(link1, NULL, AT_SYMLINK_FOLLOW) == 0);
	162	assert_se(path_is_mount_point(link1, NULL, 0) == 0);
	163
	164	/* directory mountpoints */
62a85ee0	165	dir1 = path_join(tmp_dir, "dir1");
049af8ad ZJS	166	assert_se(dir1);
049af8ad ZJS	167	assert_se(mkdir(dir1, 0755) == 0);
62a85ee0	168	dirlink1 = path_join(tmp_dir, "dirlink1");
049af8ad ZJS	169	assert_se(dirlink1);
049af8ad ZJS	170	assert_se(symlink("dir1", dirlink1) == 0);
62a85ee0	171	dirlink1file = path_join(tmp_dir, "dirlink1file");
049af8ad ZJS	172	assert_se(dirlink1file);
049af8ad ZJS	173	assert_se(symlink("dirlink1/file", dirlink1file) == 0);
62a85ee0	174	dir2 = path_join(tmp_dir, "dir2");
049af8ad ZJS	175	assert_se(dir2);
	176	assert_se(mkdir(dir2, 0755) == 0);
	177
	178	assert_se(path_is_mount_point(dir1, NULL, AT_SYMLINK_FOLLOW) == 0);
	179	assert_se(path_is_mount_point(dir1, NULL, 0) == 0);
	180	assert_se(path_is_mount_point(dirlink1, NULL, AT_SYMLINK_FOLLOW) == 0);
	181	assert_se(path_is_mount_point(dirlink1, NULL, 0) == 0);
	182
	183	/* file in subdirectory mountpoints */
62a85ee0	184	dir1file = path_join(dir1, "file");
049af8ad ZJS	185	assert_se(dir1file);
	186	fd = open(dir1file, O_WRONLY\|O_CREAT\|O_EXCL\|O_CLOEXEC, 0664);
	187	assert_se(fd > 0);
	188	close(fd);
	189
	190	assert_se(path_is_mount_point(dir1file, NULL, AT_SYMLINK_FOLLOW) == 0);
	191	assert_se(path_is_mount_point(dir1file, NULL, 0) == 0);
	192	assert_se(path_is_mount_point(dirlink1file, NULL, AT_SYMLINK_FOLLOW) == 0);
	193	assert_se(path_is_mount_point(dirlink1file, NULL, 0) == 0);
	194
	195	/* these tests will only work as root */
	196	if (mount(file1, file2, NULL, MS_BIND, NULL) >= 0) {
	197	int rf, rt, rdf, rdt, rlf, rlt, rl1f, rl1t;
	198	const char *file2d;
	199
	200	/* files */
	201	/* capture results in vars, to avoid dangling mounts on failure */
	202	log_info("%s: %s", __func__, file2);
	203	rf = path_is_mount_point(file2, NULL, 0);
	204	rt = path_is_mount_point(file2, NULL, AT_SYMLINK_FOLLOW);
	205
	206	file2d = strjoina(file2, "/");
	207	log_info("%s: %s", __func__, file2d);
	208	rdf = path_is_mount_point(file2d, NULL, 0);
	209	rdt = path_is_mount_point(file2d, NULL, AT_SYMLINK_FOLLOW);
	210
	211	log_info("%s: %s", __func__, link2);
	212	rlf = path_is_mount_point(link2, NULL, 0);
	213	rlt = path_is_mount_point(link2, NULL, AT_SYMLINK_FOLLOW);
	214
	215	assert_se(umount(file2) == 0);
	216
	217	assert_se(rf == 1);
	218	assert_se(rt == 1);
	219	assert_se(rdf == -ENOTDIR);
	220	assert_se(rdt == -ENOTDIR);
	221	assert_se(rlf == 0);
	222	assert_se(rlt == 1);
	223
	224	/* dirs */
62a85ee0	225	dir2file = path_join(dir2, "file");
049af8ad ZJS	226	assert_se(dir2file);
	227	fd = open(dir2file, O_WRONLY\|O_CREAT\|O_EXCL\|O_CLOEXEC, 0664);
	228	assert_se(fd > 0);
	229	close(fd);
	230
	231	assert_se(mount(dir2, dir1, NULL, MS_BIND, NULL) >= 0);
	232
	233	log_info("%s: %s", __func__, dir1);
	234	rf = path_is_mount_point(dir1, NULL, 0);
	235	rt = path_is_mount_point(dir1, NULL, AT_SYMLINK_FOLLOW);
	236	log_info("%s: %s", __func__, dirlink1);
	237	rlf = path_is_mount_point(dirlink1, NULL, 0);
	238	rlt = path_is_mount_point(dirlink1, NULL, AT_SYMLINK_FOLLOW);
	239	log_info("%s: %s", __func__, dirlink1file);
	240	/* its parent is a mount point, but not /file itself */
	241	rl1f = path_is_mount_point(dirlink1file, NULL, 0);
	242	rl1t = path_is_mount_point(dirlink1file, NULL, AT_SYMLINK_FOLLOW);
	243
	244	assert_se(umount(dir1) == 0);
	245
	246	assert_se(rf == 1);
	247	assert_se(rt == 1);
	248	assert_se(rlf == 0);
	249	assert_se(rlt == 1);
	250	assert_se(rl1f == 0);
	251	assert_se(rl1t == 0);
	252
	253	} else
	254	printf("Skipping bind mount file test: %m\n");
	255
	256	assert_se(rm_rf(tmp_dir, REMOVE_ROOT\|REMOVE_PHYSICAL) == 0);
	257	}
	258
	259	int main(int argc, char *argv[]) {
	260	test_setup_logging(LOG_DEBUG);
	261
af918c48 LP	262	/* let's move into our own mount namespace with all propagation from the host turned off, so that
	263	* /proc/self/mountinfo is static and constant for the whole time our test runs. */
	264	if (unshare(CLONE_NEWNS) < 0) {
	265	if (!ERRNO_IS_PRIVILEGE(errno))
	266	return log_error_errno(errno, "Failed to detach mount namespace: %m");
	267
	268	log_notice("Lacking privilege to create separate mount namespace, proceeding in originating mount namespace.");
	269	} else
	270	assert_se(mount(NULL, "/", NULL, MS_PRIVATE \| MS_REC, NULL) >= 0);
	271
049af8ad ZJS	272	test_mount_propagation_flags("shared", 0, MS_SHARED);
	273	test_mount_propagation_flags("slave", 0, MS_SLAVE);
	274	test_mount_propagation_flags("private", 0, MS_PRIVATE);
	275	test_mount_propagation_flags(NULL, 0, 0);
	276	test_mount_propagation_flags("", 0, 0);
	277	test_mount_propagation_flags("xxxx", -EINVAL, 0);
	278	test_mount_propagation_flags(" ", -EINVAL, 0);
	279
	280	test_mnt_id();
	281	test_path_is_mount_point();
	282
	283	return 0;
	284	}