src/nspawn/nspawn-mount.h

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 #pragma once
   3
   4 /***
   5   This file is part of systemd.
   6
   7   Copyright 2015 Lennart Poettering
   8 ***/
   9
  10 #include <stdbool.h>
  11
  12 #include "cgroup-util.h"
  13 #include "volatile-util.h"
  14
  15 typedef enum MountSettingsMask {
  16         MOUNT_FATAL              = 1 << 0, /* if set, a mount error is considered fatal */
  17         MOUNT_USE_USERNS         = 1 << 1, /* if set, mounts are patched considering uid/gid shifts in a user namespace */
  18         MOUNT_IN_USERNS          = 1 << 2, /* if set, the mount is executed in the inner child, otherwise in the outer child */
  19         MOUNT_APPLY_APIVFS_RO    = 1 << 3, /* if set, /proc/sys, and /sysfs will be mounted read-only, otherwise read-write. */
  20         MOUNT_APPLY_APIVFS_NETNS = 1 << 4, /* if set, /proc/sys/net will be mounted read-write.
  21                                               Works only if MOUNT_APPLY_APIVFS_RO is also set. */
  22 } MountSettingsMask;
  23
  24 typedef enum CustomMountType {
  25         CUSTOM_MOUNT_BIND,
  26         CUSTOM_MOUNT_TMPFS,
  27         CUSTOM_MOUNT_OVERLAY,
  28         _CUSTOM_MOUNT_TYPE_MAX,
  29         _CUSTOM_MOUNT_TYPE_INVALID = -1
  30 } CustomMountType;
  31
  32 typedef struct CustomMount {
  33         CustomMountType type;
  34         bool read_only;
  35         char *source; /* for overlayfs this is the upper directory */
  36         char *destination;
  37         char *options;
  38         char *work_dir;
  39         char **lower;
  40         char *rm_rf_tmpdir;
  41 } CustomMount;
  42
  43 CustomMount* custom_mount_add(CustomMount **l, unsigned *n, CustomMountType t);
  44 void custom_mount_free_all(CustomMount *l, unsigned n);
  45 int custom_mount_prepare_all(const char *dest, CustomMount *l, unsigned n);
  46
  47 int bind_mount_parse(CustomMount **l, unsigned *n, const char *s, bool read_only);
  48 int tmpfs_mount_parse(CustomMount **l, unsigned *n, const char *s);
  49 int overlay_mount_parse(CustomMount **l, unsigned *n, const char *s, bool read_only);
  50
  51 int mount_all(const char *dest, MountSettingsMask mount_settings, uid_t uid_shift, uid_t uid_range, const char *selinux_apifs_context);
  52 int mount_sysfs(const char *dest, MountSettingsMask mount_settings);
  53
  54 int mount_cgroups(const char *dest, CGroupUnified unified_requested, bool userns, uid_t uid_shift, uid_t uid_range, const char *selinux_apifs_context, bool use_cgns);
  55 int mount_systemd_cgroup_writable(const char *dest, CGroupUnified unified_requested);
  56
  57 int mount_custom(const char *dest, CustomMount *mounts, unsigned n, bool userns, uid_t uid_shift, uid_t uid_range, const char *selinux_apifs_context);
  58
  59 int setup_volatile(const char *directory, VolatileMode mode, bool userns, uid_t uid_shift, uid_t uid_range, const char *selinux_apifs_context);
  60 int setup_volatile_state(const char *directory, VolatileMode mode, bool userns, uid_t uid_shift, uid_t uid_range, const char *selinux_apifs_context);
  61
  62 int pivot_root_parse(char **pivot_root_new, char **pivot_root_old, const char *s);
  63 int setup_pivot_root(const char *directory, const char *pivot_root_new, const char *pivot_root_old);