namespace-util: correct assertion in namespace_is_init()

Follow-up for 18ead2b03d

src/basic/namespace-util.c

@@ -236,6 +236,28 @@ int is_our_namespace(int fd, NamespaceType type) {
         return fd_inode_same(fd, our_ns);
 }
 
+int namespace_is_init(NamespaceType type) {
+        int r;
+
+        assert(type >= 0);
+        assert(type < _NAMESPACE_TYPE_MAX);
+
+        if (namespace_info[type].root_inode == 0)
+                return -EBADR; /* Cannot answer this question */
+
+        const char *p = pid_namespace_path(0, type);
+
+        struct stat st;
+        r = RET_NERRNO(stat(p, &st));
+        if (r == -ENOENT)
+                /* If the /proc/ns/<type> API is not around in /proc/ then ns is off in the kernel and we are in the init ns */
+                return proc_mounted() == 0 ? -ENOSYS : true;
+        if (r < 0)
+                return r;
+
+        return st.st_ino == namespace_info[type].root_inode;
+}
+
 int detach_mount_namespace(void) {
         /* Detaches the mount namespace, disabling propagation from our namespace to the host. Sets
          * propagation first to MS_SLAVE for all mounts (disabling propagation), and then back to MS_SHARED
@@ -482,28 +504,6 @@ int namespace_open_by_type(NamespaceType type) {
         return fd;
 }
 
-int namespace_is_init(NamespaceType type) {
-        int r;
-
-        assert(type >= 0);
-        assert(type <= _NAMESPACE_TYPE_MAX);
-
-        if (namespace_info[type].root_inode == 0)
-                return -EBADR; /* Cannot answer this question */
-
-        const char *p = pid_namespace_path(0, type);
-
-        struct stat st;
-        r = RET_NERRNO(stat(p, &st));
-        if (r == -ENOENT)
-                /* If the /proc/ns/<type> API is not around in /proc/ then ns is off in the kernel and we are in the init ns */
-                return proc_mounted() == 0 ? -ENOSYS : true;
-        if (r < 0)
-                return r;
-
-        return st.st_ino == namespace_info[type].root_inode;
-}
-
 int is_idmapping_supported(const char *path) {
         _cleanup_close_ int mount_fd = -EBADF, userns_fd = -EBADF, dir_fd = -EBADF;
         _cleanup_free_ char *uid_map = NULL, *gid_map = NULL;

src/basic/namespace-util.h

@@ -49,6 +49,8 @@ int namespace_enter(int pidns_fd, int mntns_fd, int netns_fd, int userns_fd, int
 int fd_is_namespace(int fd, NamespaceType type);
 int is_our_namespace(int fd, NamespaceType type);
 
+int namespace_is_init(NamespaceType type);
+
 int detach_mount_namespace(void);
 int detach_mount_namespace_harder(uid_t target_uid, gid_t target_gid);
 int detach_mount_namespace_userns(int userns_fd);
@@ -79,6 +81,4 @@ int parse_userns_uid_range(const char *s, uid_t *ret_uid_shift, uid_t *ret_uid_r
 
 int namespace_open_by_type(NamespaceType type);
 
-int namespace_is_init(NamespaceType type);
-
 int is_idmapping_supported(const char *path);

src/basic/virt.c

@@ -16,6 +16,7 @@
 #include "fileio.h"
 #include "macro.h"
 #include "missing_threads.h"
+#include "namespace-util.h"
 #include "process-util.h"
 #include "stat-util.h"
 #include "string-table.h"