src/nspawn/nspawn-mount.h

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 #pragma once
   3
   4 #include <stdbool.h>
   5
   6 #include "cgroup-util.h"
   7 #include "volatile-util.h"
   8
   9 typedef enum MountSettingsMask {
  10         MOUNT_FATAL              = 1 << 0, /* if set, a mount error is considered fatal */
  11         MOUNT_USE_USERNS         = 1 << 1, /* if set, mounts are patched considering uid/gid shifts in a user namespace */
  12         MOUNT_IN_USERNS          = 1 << 2, /* if set, the mount is executed in the inner child, otherwise in the outer child */
  13         MOUNT_APPLY_APIVFS_RO    = 1 << 3, /* if set, /proc/sys, and /sys will be mounted read-only, otherwise read-write. */
  14         MOUNT_APPLY_APIVFS_NETNS = 1 << 4, /* if set, /proc/sys/net will be mounted read-write.
  15                                                Works only if MOUNT_APPLY_APIVFS_RO is also set. */
  16         MOUNT_APPLY_TMPFS_TMP    = 1 << 5, /* if set, /tmp will be mounted as tmpfs */
  17 } MountSettingsMask;
  18
  19 typedef enum CustomMountType {
  20         CUSTOM_MOUNT_BIND,
  21         CUSTOM_MOUNT_TMPFS,
  22         CUSTOM_MOUNT_OVERLAY,
  23         CUSTOM_MOUNT_INACCESSIBLE,
  24         CUSTOM_MOUNT_ARBITRARY,
  25         _CUSTOM_MOUNT_TYPE_MAX,
  26         _CUSTOM_MOUNT_TYPE_INVALID = -1
  27 } CustomMountType;
  28
  29 typedef struct CustomMount {
  30         CustomMountType type;
  31         bool read_only;
  32         char *source; /* for overlayfs this is the upper directory */
  33         char *destination;
  34         char *options;
  35         char *work_dir;
  36         char **lower;
  37         char *rm_rf_tmpdir;
  38         char *type_argument; /* only for CUSTOM_MOUNT_ARBITRARY */
  39         bool graceful;
  40         bool in_userns;
  41 } CustomMount;
  42
  43 CustomMount* custom_mount_add(CustomMount **l, size_t *n, CustomMountType t);
  44 void custom_mount_free_all(CustomMount *l, size_t n);
  45 int custom_mount_prepare_all(const char *dest, CustomMount *l, size_t n);
  46
  47 int bind_mount_parse(CustomMount **l, size_t *n, const char *s, bool read_only);
  48 int tmpfs_mount_parse(CustomMount **l, size_t *n, const char *s);
  49 int overlay_mount_parse(CustomMount **l, size_t *n, const char *s, bool read_only);
  50 int inaccessible_mount_parse(CustomMount **l, size_t *n, const char *s);
  51
  52 int mount_all(const char *dest, MountSettingsMask mount_settings, uid_t uid_shift, const char *selinux_apifs_context);
  53 int mount_sysfs(const char *dest, MountSettingsMask mount_settings);
  54
  55 int mount_custom(const char *dest, CustomMount *mounts, size_t n, bool userns, uid_t uid_shift, uid_t uid_range, const char *selinux_apifs_context, bool in_userns);
  56
  57 int setup_volatile_mode(const char *directory, VolatileMode mode, bool userns, uid_t uid_shift, uid_t uid_range, const char *selinux_apifs_context);
  58
  59 int pivot_root_parse(char **pivot_root_new, char **pivot_root_old, const char *s);
  60 int setup_pivot_root(const char *directory, const char *pivot_root_new, const char *pivot_root_old);
  61
  62 int tmpfs_patch_options(const char *options,uid_t uid_shift, const char *selinux_apifs_context, char **ret);