Split out part of mount-util.c into mountpoint-util.c

The idea is that anything which is related to actually manipulating mounts is
in mount-util.c, but functions for mountpoint introspection are moved to the
new file. Anything which requires libmount must be in mount-util.c.

This was supposed to be a preparation for further changes, with no functional
difference, but it results in a significant change in linkage:

$ ldd build/libnss_*.so.2
(before)
build/libnss_myhostname.so.2:
	linux-vdso.so.1 (0x00007fff77bf5000)
	librt.so.1 => /lib64/librt.so.1 (0x00007f4bbb7b2000)
	libmount.so.1 => /lib64/libmount.so.1 (0x00007f4bbb755000)
	libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f4bbb734000)
	libc.so.6 => /lib64/libc.so.6 (0x00007f4bbb56e000)
	/lib64/ld-linux-x86-64.so.2 (0x00007f4bbb8c1000)
	libblkid.so.1 => /lib64/libblkid.so.1 (0x00007f4bbb51b000)
	libuuid.so.1 => /lib64/libuuid.so.1 (0x00007f4bbb512000)
	libselinux.so.1 => /lib64/libselinux.so.1 (0x00007f4bbb4e3000)
	libpcre2-8.so.0 => /lib64/libpcre2-8.so.0 (0x00007f4bbb45e000)
	libdl.so.2 => /lib64/libdl.so.2 (0x00007f4bbb458000)
build/libnss_mymachines.so.2:
	linux-vdso.so.1 (0x00007ffc19cc0000)
	librt.so.1 => /lib64/librt.so.1 (0x00007fdecb74b000)
	libcap.so.2 => /lib64/libcap.so.2 (0x00007fdecb744000)
	libmount.so.1 => /lib64/libmount.so.1 (0x00007fdecb6e7000)
	libpthread.so.0 => /lib64/libpthread.so.0 (0x00007fdecb6c6000)
	libc.so.6 => /lib64/libc.so.6 (0x00007fdecb500000)
	/lib64/ld-linux-x86-64.so.2 (0x00007fdecb8a9000)
	libblkid.so.1 => /lib64/libblkid.so.1 (0x00007fdecb4ad000)
	libuuid.so.1 => /lib64/libuuid.so.1 (0x00007fdecb4a2000)
	libselinux.so.1 => /lib64/libselinux.so.1 (0x00007fdecb475000)
	libpcre2-8.so.0 => /lib64/libpcre2-8.so.0 (0x00007fdecb3f0000)
	libdl.so.2 => /lib64/libdl.so.2 (0x00007fdecb3ea000)
build/libnss_resolve.so.2:
	linux-vdso.so.1 (0x00007ffe8ef8e000)
	librt.so.1 => /lib64/librt.so.1 (0x00007fcf314bd000)
	libcap.so.2 => /lib64/libcap.so.2 (0x00007fcf314b6000)
	libmount.so.1 => /lib64/libmount.so.1 (0x00007fcf31459000)
	libpthread.so.0 => /lib64/libpthread.so.0 (0x00007fcf31438000)
	libc.so.6 => /lib64/libc.so.6 (0x00007fcf31272000)
	/lib64/ld-linux-x86-64.so.2 (0x00007fcf31615000)
	libblkid.so.1 => /lib64/libblkid.so.1 (0x00007fcf3121f000)
	libuuid.so.1 => /lib64/libuuid.so.1 (0x00007fcf31214000)
	libselinux.so.1 => /lib64/libselinux.so.1 (0x00007fcf311e7000)
	libpcre2-8.so.0 => /lib64/libpcre2-8.so.0 (0x00007fcf31162000)
	libdl.so.2 => /lib64/libdl.so.2 (0x00007fcf3115c000)
build/libnss_systemd.so.2:
	linux-vdso.so.1 (0x00007ffda6d17000)
	librt.so.1 => /lib64/librt.so.1 (0x00007f610b83c000)
	libcap.so.2 => /lib64/libcap.so.2 (0x00007f610b835000)
	libmount.so.1 => /lib64/libmount.so.1 (0x00007f610b7d8000)
	libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f610b7b7000)
	libc.so.6 => /lib64/libc.so.6 (0x00007f610b5f1000)
	/lib64/ld-linux-x86-64.so.2 (0x00007f610b995000)
	libblkid.so.1 => /lib64/libblkid.so.1 (0x00007f610b59e000)
	libuuid.so.1 => /lib64/libuuid.so.1 (0x00007f610b593000)
	libselinux.so.1 => /lib64/libselinux.so.1 (0x00007f610b566000)
	libpcre2-8.so.0 => /lib64/libpcre2-8.so.0 (0x00007f610b4e1000)
        libdl.so.2 => /lib64/libdl.so.2 (0x00007f610b4db000)

(after)
build/libnss_myhostname.so.2:
	linux-vdso.so.1 (0x00007fff0b5e2000)
	librt.so.1 => /lib64/librt.so.1 (0x00007fde0c328000)
	libpthread.so.0 => /lib64/libpthread.so.0 (0x00007fde0c307000)
	libc.so.6 => /lib64/libc.so.6 (0x00007fde0c141000)
	/lib64/ld-linux-x86-64.so.2 (0x00007fde0c435000)
build/libnss_mymachines.so.2:
	linux-vdso.so.1 (0x00007ffdc30a7000)
	librt.so.1 => /lib64/librt.so.1 (0x00007f06ecabb000)
	libcap.so.2 => /lib64/libcap.so.2 (0x00007f06ecab4000)
	libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f06eca93000)
	libc.so.6 => /lib64/libc.so.6 (0x00007f06ec8cd000)
	/lib64/ld-linux-x86-64.so.2 (0x00007f06ecc15000)
build/libnss_resolve.so.2:
	linux-vdso.so.1 (0x00007ffe95747000)
	librt.so.1 => /lib64/librt.so.1 (0x00007fa56a80f000)
	libcap.so.2 => /lib64/libcap.so.2 (0x00007fa56a808000)
	libpthread.so.0 => /lib64/libpthread.so.0 (0x00007fa56a7e7000)
	libc.so.6 => /lib64/libc.so.6 (0x00007fa56a621000)
	/lib64/ld-linux-x86-64.so.2 (0x00007fa56a964000)
build/libnss_systemd.so.2:
	linux-vdso.so.1 (0x00007ffe67b51000)
	librt.so.1 => /lib64/librt.so.1 (0x00007ffb32113000)
	libcap.so.2 => /lib64/libcap.so.2 (0x00007ffb3210c000)
	libpthread.so.0 => /lib64/libpthread.so.0 (0x00007ffb320eb000)
	libc.so.6 => /lib64/libc.so.6 (0x00007ffb31f25000)
	/lib64/ld-linux-x86-64.so.2 (0x00007ffb3226a000)

I don't quite understand what is going on here, but let's not be too picky.

1 files changed, 0 insertions, 244 deletions

diff --git a/src/test/test-mount-util.c b/src/test/test-mount-util.c
index 56e385aa11..6986405dc6 100644
--- a/src/test/test-mount-util.c
+++ b/src/test/test-mount-util.c
@@ -3,243 +3,10 @@
 #include <sys/mount.h>
 
 #include "alloc-util.h"
-#include "def.h"
-#include "fd-util.h"
-#include "fileio.h"
-#include "hashmap.h"
-#include "log.h"
-#include "log.h"
 #include "mount-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;
-
-        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;
-        Hashmap *h;
-        Iterator i;
-        char *p;
-        void *k;
-        int r;
-
-        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);
-
-                assert_se(hashmap_put(h, INT_TO_PTR(mnt_id), path) >= 0);
-                path = NULL;
-        }
-
-        HASHMAP_FOREACH_KEY(p, k, h, i) {
-                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;
-                }
-
-                log_debug("mnt id of %s is %i\n", p, mnt_id2);
-
-                if (mnt_id == mnt_id2)
-                        continue;
-
-                /* 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 */
-                assert_se(path_equal_ptr(hashmap_get(h, INT_TO_PTR(mnt_id2)), p));
-        }
-
-        hashmap_free_free(h);
-}
-
-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;
-
-        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(NULL, tmp_dir, "file1");
-        assert_se(file1);
-        file2 = path_join(NULL, 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(NULL, tmp_dir, "link1");
-        assert_se(link1);
-        assert_se(symlink("file1", link1) == 0);
-        link2 = path_join(NULL, 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(NULL, tmp_dir, "dir1");
-        assert_se(dir1);
-        assert_se(mkdir(dir1, 0755) == 0);
-        dirlink1 = path_join(NULL, tmp_dir, "dirlink1");
-        assert_se(dirlink1);
-        assert_se(symlink("dir1", dirlink1) == 0);
-        dirlink1file = path_join(NULL, tmp_dir, "dirlink1file");
-        assert_se(dirlink1file);
-        assert_se(symlink("dirlink1/file", dirlink1file) == 0);
-        dir2 = path_join(NULL, 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(NULL, 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(NULL, 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);
-}
-
 static void test_mount_option_mangle(void) {
         char *opts = NULL;
         unsigned long f;
@@ -295,19 +62,8 @@ static void test_mount_option_mangle(void) {
 }
 
 int main(int argc, char *argv[]) {
-
         test_setup_logging(LOG_DEBUG);
 
-        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();
         test_mount_option_mangle();
 
         return 0;