nspawn: add support for owneridmap bind option

[thirdparty/systemd.git] / src / shared / mount-util.h

diff --git a/src/shared/mount-util.h b/src/shared/mount-util.h
index 84ea4b6392773f388e132b7f0c5f877ccd1c9043..2f9f394ab0edd8e107c482c47827322f0baa3fde 100644 (file)
--- a/src/shared/mount-util.h
+++ b/src/shared/mount-util.h
@@ -10,9 +10,15 @@
 #include "dissect-image.h"
 #include "errno-util.h"
 #include "macro.h"
+#include "pidref.h"
 
 int repeat_unmount(const char *path, int flags);
-int umount_recursive(const char *target, int flags);
+
+int umount_recursive_full(const char *target, int flags, char **keep);
+
+static inline int umount_recursive(const char *target, int flags) {
+        return umount_recursive_full(target, flags, NULL);
+}
 
 int bind_remount_recursive_with_mountinfo(const char *prefix, unsigned long new_flags, unsigned long flags_mask, char **deny_list, FILE *proc_self_mountinfo);
 static inline int bind_remount_recursive(const char *prefix, unsigned long new_flags, unsigned long flags_mask, char **deny_list) {
@@ -21,7 +27,10 @@ static inline int bind_remount_recursive(const char *prefix, unsigned long new_f
 
 int bind_remount_one_with_mountinfo(const char *path, unsigned long new_flags, unsigned long flags_mask, FILE *proc_self_mountinfo);
 
-int mount_switch_root(const char *path, unsigned long mount_propagation_flag);
+int mount_switch_root_full(const char *path, unsigned long mount_propagation_flag, bool force_ms_move);
+static inline int mount_switch_root(const char *path, unsigned long mount_propagation_flag) {
+        return mount_switch_root_full(path, mount_propagation_flag, false);
+}
 
 DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(FILE*, endmntent, NULL);
 #define _cleanup_endmntent_ _cleanup_(endmntentp)
@@ -60,6 +69,8 @@ int umount_verbose(
                 const char *where,
                 int flags);
 
+int mount_exchange_graceful(int fsmount_fd, const char *dest, bool mount_beneath);
+
 int mount_option_mangle(
                 const char *options,
                 unsigned long mount_flags,
@@ -80,10 +91,19 @@ static inline char* umount_and_rmdir_and_free(char *p) {
 }
 DEFINE_TRIVIAL_CLEANUP_FUNC(char*, umount_and_rmdir_and_free);
 
-int bind_mount_in_namespace(pid_t target, const char *propagate_path, const char *incoming_path, const char *src, const char *dest, bool read_only, bool make_file_or_directory);
-int mount_image_in_namespace(pid_t target, const char *propagate_path, const char *incoming_path, const char *src, const char *dest, bool read_only, bool make_file_or_directory, const MountOptions *options);
+static inline char *umount_and_free(char *p) {
+        PROTECT_ERRNO;
+        if (p)
+                (void) umount_recursive(p, 0);
+        return mfree(p);
+}
+DEFINE_TRIVIAL_CLEANUP_FUNC(char*, umount_and_free);
+
+int bind_mount_in_namespace(PidRef *target, const char *propagate_path, const char *incoming_path, const char *src, const char *dest, bool read_only, bool make_file_or_directory);
+int mount_image_in_namespace(PidRef *target, const char *propagate_path, const char *incoming_path, const char *src, const char *dest, bool read_only, bool make_file_or_directory, const MountOptions *options, const ImagePolicy *image_policy);
 
 int make_mount_point(const char *path);
+int fd_make_mount_point(int fd);
 
 typedef enum RemountIdmapping {
         REMOUNT_IDMAPPING_NONE,
@@ -96,23 +116,31 @@ typedef enum RemountIdmapping {
          * certain security implications defaults to off, and requires explicit opt-in. */
         REMOUNT_IDMAPPING_HOST_ROOT,
         /* Define a mapping from root user within the container to the owner of the bind mounted directory.
-         * This ensure no root-owned files will be written in a bind-mounted directory owned by a different
+         * This ensures no root-owned files will be written in a bind-mounted directory owned by a different
          * user. No other users are mapped. */
         REMOUNT_IDMAPPING_HOST_OWNER,
+        /* Define a mapping from bind-target owner within the container to the host owner of the bind mounted
+         * directory. No other users are mapped. */
+        REMOUNT_IDMAPPING_HOST_OWNER_TO_TARGET_OWNER,
         _REMOUNT_IDMAPPING_MAX,
         _REMOUNT_IDMAPPING_INVALID = -EINVAL,
 } RemountIdmapping;
 
-int remount_idmap(const char *p, uid_t uid_shift, uid_t uid_range, uid_t owner, RemountIdmapping idmapping);
+int make_userns(uid_t uid_shift, uid_t uid_range, uid_t host_owner, uid_t dest_owner, RemountIdmapping idmapping);
+int remount_idmap_fd(char **p, int userns_fd);
+int remount_idmap(char **p, uid_t uid_shift, uid_t uid_range, uid_t host_owner, uid_t dest_owner, RemountIdmapping idmapping);
 
-int remount_and_move_sub_mounts(
-                const char *what,
-                const char *where,
-                const char *type,
-                unsigned long flags,
-                const char *options);
-int remount_sysfs(const char *where);
+int bind_mount_submounts(
+                const char *source,
+                const char *target);
 
 /* Creates a mount point (not parents) based on the source path or stat - ie, a file or a directory */
 int make_mount_point_inode_from_stat(const struct stat *st, const char *dest, mode_t mode);
 int make_mount_point_inode_from_path(const char *source, const char *dest, mode_t mode);
+
+int trigger_automount_at(int dir_fd, const char *path);
+
+unsigned long credentials_fs_mount_flags(bool ro);
+int mount_credentials_fs(const char *path, size_t size, bool ro);
+
+int make_fsmount(int error_log_level, const char *what, const char *type, unsigned long flags, const char *options, int userns_fd);