049af8ad0c
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.
93 lines
3.1 KiB
C
93 lines
3.1 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <fcntl.h>
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#include <linux/magic.h>
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#include <unistd.h>
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#include "alloc-util.h"
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#include "fd-util.h"
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#include "fileio.h"
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#include "macro.h"
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#include "missing.h"
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#include "mountpoint-util.h"
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#include "stat-util.h"
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static void test_files_same(void) {
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_cleanup_close_ int fd = -1;
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char name[] = "/tmp/test-files_same.XXXXXX";
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char name_alias[] = "/tmp/test-files_same.alias";
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fd = mkostemp_safe(name);
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assert_se(fd >= 0);
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assert_se(symlink(name, name_alias) >= 0);
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assert_se(files_same(name, name, 0));
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assert_se(files_same(name, name, AT_SYMLINK_NOFOLLOW));
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assert_se(files_same(name, name_alias, 0));
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assert_se(!files_same(name, name_alias, AT_SYMLINK_NOFOLLOW));
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unlink(name);
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unlink(name_alias);
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}
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static void test_is_symlink(void) {
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char name[] = "/tmp/test-is_symlink.XXXXXX";
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char name_link[] = "/tmp/test-is_symlink.link";
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_cleanup_close_ int fd = -1;
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fd = mkostemp_safe(name);
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assert_se(fd >= 0);
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assert_se(symlink(name, name_link) >= 0);
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assert_se(is_symlink(name) == 0);
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assert_se(is_symlink(name_link) == 1);
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assert_se(is_symlink("/a/file/which/does/not/exist/i/guess") < 0);
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unlink(name);
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unlink(name_link);
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}
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static void test_path_is_fs_type(void) {
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/* run might not be a mount point in build chroots */
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if (path_is_mount_point("/run", NULL, AT_SYMLINK_FOLLOW) > 0) {
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assert_se(path_is_fs_type("/run", TMPFS_MAGIC) > 0);
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assert_se(path_is_fs_type("/run", BTRFS_SUPER_MAGIC) == 0);
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}
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assert_se(path_is_fs_type("/proc", PROC_SUPER_MAGIC) > 0);
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assert_se(path_is_fs_type("/proc", BTRFS_SUPER_MAGIC) == 0);
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assert_se(path_is_fs_type("/proc", BTRFS_SUPER_MAGIC) == 0);
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assert_se(path_is_fs_type("/i-dont-exist", BTRFS_SUPER_MAGIC) == -ENOENT);
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}
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static void test_path_is_temporary_fs(void) {
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/* run might not be a mount point in build chroots */
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if (path_is_mount_point("/run", NULL, AT_SYMLINK_FOLLOW) > 0)
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assert_se(path_is_temporary_fs("/run") > 0);
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assert_se(path_is_temporary_fs("/proc") == 0);
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assert_se(path_is_temporary_fs("/i-dont-exist") == -ENOENT);
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}
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static void test_fd_is_network_ns(void) {
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_cleanup_close_ int fd = -1;
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assert_se(fd_is_network_ns(STDIN_FILENO) == 0);
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assert_se(fd_is_network_ns(STDERR_FILENO) == 0);
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assert_se(fd_is_network_ns(STDOUT_FILENO) == 0);
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assert_se((fd = open("/proc/self/ns/mnt", O_CLOEXEC|O_RDONLY)) >= 0);
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assert_se(IN_SET(fd_is_network_ns(fd), 0, -EUCLEAN));
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fd = safe_close(fd);
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assert_se((fd = open("/proc/self/ns/net", O_CLOEXEC|O_RDONLY)) >= 0);
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assert_se(IN_SET(fd_is_network_ns(fd), 1, -EUCLEAN));
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}
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int main(int argc, char *argv[]) {
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test_files_same();
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test_is_symlink();
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test_path_is_fs_type();
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test_path_is_temporary_fs();
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test_fd_is_network_ns();
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return 0;
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}
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