src/core/dbus-mount.c

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2
   3 #include "bus-get-properties.h"
   4 #include "dbus-cgroup.h"
   5 #include "dbus-execute.h"
   6 #include "dbus-kill.h"
   7 #include "dbus-mount.h"
   8 #include "dbus-util.h"
   9 #include "fstab-util.h"
  10 #include "mount.h"
  11 #include "string-util.h"
  12 #include "unit.h"
  13 #include "utf8.h"
  14
  15 static int property_get_what(
  16                 sd_bus *bus,
  17                 const char *path,
  18                 const char *interface,
  19                 const char *property,
  20                 sd_bus_message *reply,
  21                 void *userdata,
  22                 sd_bus_error *error) {
  23
  24         _cleanup_free_ char *escaped = NULL;
  25         Mount *m = ASSERT_PTR(userdata);
  26
  27         assert(bus);
  28         assert(reply);
  29
  30         escaped = mount_get_what_escaped(m);
  31         if (!escaped)
  32                 return -ENOMEM;
  33
  34         return sd_bus_message_append_basic(reply, 's', escaped);
  35 }
  36
  37 static int property_get_options(
  38                 sd_bus *bus,
  39                 const char *path,
  40                 const char *interface,
  41                 const char *property,
  42                 sd_bus_message *reply,
  43                 void *userdata,
  44                 sd_bus_error *error) {
  45
  46         _cleanup_free_ char *escaped = NULL;
  47         Mount *m = ASSERT_PTR(userdata);
  48
  49         assert(bus);
  50         assert(reply);
  51
  52         escaped = mount_get_options_escaped(m);
  53         if (!escaped)
  54                 return -ENOMEM;
  55
  56         return sd_bus_message_append_basic(reply, 's', escaped);
  57 }
  58
  59 static BUS_DEFINE_PROPERTY_GET(property_get_type, "s", Mount, mount_get_fstype);
  60 static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_result, mount_result, MountResult);
  61
  62 const sd_bus_vtable bus_mount_vtable[] = {
  63         SD_BUS_VTABLE_START(0),
  64         SD_BUS_PROPERTY("Where", "s", NULL, offsetof(Mount, where), SD_BUS_VTABLE_PROPERTY_CONST),
  65         SD_BUS_PROPERTY("What", "s", property_get_what, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
  66         SD_BUS_PROPERTY("Options","s", property_get_options, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
  67         SD_BUS_PROPERTY("Type", "s", property_get_type, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
  68         SD_BUS_PROPERTY("TimeoutUSec", "t", bus_property_get_usec, offsetof(Mount, timeout_usec), SD_BUS_VTABLE_PROPERTY_CONST),
  69         SD_BUS_PROPERTY("ControlPID", "u", bus_property_get_pid, offsetof(Mount, control_pid.pid), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
  70         SD_BUS_PROPERTY("DirectoryMode", "u", bus_property_get_mode, offsetof(Mount, directory_mode), SD_BUS_VTABLE_PROPERTY_CONST),
  71         SD_BUS_PROPERTY("SloppyOptions", "b", bus_property_get_bool, offsetof(Mount, sloppy_options), SD_BUS_VTABLE_PROPERTY_CONST),
  72         SD_BUS_PROPERTY("LazyUnmount", "b", bus_property_get_bool, offsetof(Mount, lazy_unmount), SD_BUS_VTABLE_PROPERTY_CONST),
  73         SD_BUS_PROPERTY("ForceUnmount", "b", bus_property_get_bool, offsetof(Mount, force_unmount), SD_BUS_VTABLE_PROPERTY_CONST),
  74         SD_BUS_PROPERTY("ReadWriteOnly", "b", bus_property_get_bool, offsetof(Mount, read_write_only), SD_BUS_VTABLE_PROPERTY_CONST),
  75         SD_BUS_PROPERTY("Result", "s", property_get_result, offsetof(Mount, result), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
  76         SD_BUS_PROPERTY("UID", "u", bus_property_get_uid, offsetof(Unit, ref_uid), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
  77         SD_BUS_PROPERTY("GID", "u", bus_property_get_gid, offsetof(Unit, ref_gid), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
  78         BUS_EXEC_COMMAND_VTABLE("ExecMount", offsetof(Mount, exec_command[MOUNT_EXEC_MOUNT]), SD_BUS_VTABLE_PROPERTY_EMITS_INVALIDATION),
  79         BUS_EXEC_COMMAND_VTABLE("ExecUnmount", offsetof(Mount, exec_command[MOUNT_EXEC_UNMOUNT]), SD_BUS_VTABLE_PROPERTY_EMITS_INVALIDATION),
  80         BUS_EXEC_COMMAND_VTABLE("ExecRemount", offsetof(Mount, exec_command[MOUNT_EXEC_REMOUNT]), SD_BUS_VTABLE_PROPERTY_EMITS_INVALIDATION),
  81         SD_BUS_VTABLE_END
  82 };
  83
  84 static int bus_mount_set_transient_property(
  85                 Mount *m,
  86                 const char *name,
  87                 sd_bus_message *message,
  88                 UnitWriteFlags flags,
  89                 sd_bus_error *error) {
  90
  91         Unit *u = UNIT(m);
  92         int r;
  93
  94         assert(m);
  95         assert(name);
  96         assert(message);
  97
  98         flags |= UNIT_PRIVATE;
  99
 100         if (streq(name, "Where"))
 101                 return bus_set_transient_path(u, name, &m->where, message, flags, error);
 102
 103         if (streq(name, "What")) {
 104                 _cleanup_free_ char *path = NULL;
 105                 const char *v;
 106
 107                 r = sd_bus_message_read(message, "s", &v);
 108                 if (r < 0)
 109                         return r;
 110
 111                 if (!isempty(v)) {
 112                         path = fstab_node_to_udev_node(v);
 113                         if (!path)
 114                                 return -ENOMEM;
 115
 116                         /* path_is_valid is not used - see the comment for config_parse_mount_node */
 117                         if (strlen(path) >= PATH_MAX)
 118                                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Resolved What=%s too long", path);
 119                 }
 120
 121                 if (!UNIT_WRITE_FLAGS_NOOP(flags)) {
 122                         free_and_replace(m->parameters_fragment.what, path);
 123                         unit_write_settingf(u, flags|UNIT_ESCAPE_SPECIFIERS, name, "What=%s", strempty(m->parameters_fragment.what));
 124                 }
 125
 126                 return 1;
 127         }
 128
 129         if (streq(name, "Options"))
 130                 return bus_set_transient_string(u, name, &m->parameters_fragment.options, message, flags, error);
 131
 132         if (streq(name, "Type"))
 133                 return bus_set_transient_string(u, name, &m->parameters_fragment.fstype, message, flags, error);
 134
 135         if (streq(name, "TimeoutUSec"))
 136                 return bus_set_transient_usec_fix_0(u, name, &m->timeout_usec, message, flags, error);
 137
 138         if (streq(name, "DirectoryMode"))
 139                 return bus_set_transient_mode_t(u, name, &m->directory_mode, message, flags, error);
 140
 141         if (streq(name, "SloppyOptions"))
 142                 return bus_set_transient_bool(u, name, &m->sloppy_options, message, flags, error);
 143
 144         if (streq(name, "LazyUnmount"))
 145                 return bus_set_transient_bool(u, name, &m->lazy_unmount, message, flags, error);
 146
 147         if (streq(name, "ForceUnmount"))
 148                 return bus_set_transient_bool(u, name, &m->force_unmount, message, flags, error);
 149
 150         if (streq(name, "ReadWriteOnly"))
 151                 return bus_set_transient_bool(u, name, &m->read_write_only, message, flags, error);
 152
 153         return 0;
 154 }
 155
 156 int bus_mount_set_property(
 157                 Unit *u,
 158                 const char *name,
 159                 sd_bus_message *message,
 160                 UnitWriteFlags flags,
 161                 sd_bus_error *error) {
 162
 163         Mount *m = MOUNT(u);
 164         int r;
 165
 166         assert(m);
 167         assert(name);
 168         assert(message);
 169
 170         r = bus_cgroup_set_property(u, &m->cgroup_context, name, message, flags, error);
 171         if (r != 0)
 172                 return r;
 173
 174         if (u->transient && u->load_state == UNIT_STUB) {
 175                 /* This is a transient unit, let's load a little more */
 176
 177                 r = bus_mount_set_transient_property(m, name, message, flags, error);
 178                 if (r != 0)
 179                         return r;
 180
 181                 r = bus_exec_context_set_transient_property(u, &m->exec_context, name, message, flags, error);
 182                 if (r != 0)
 183                         return r;
 184
 185                 r = bus_kill_context_set_transient_property(u, &m->kill_context, name, message, flags, error);
 186                 if (r != 0)
 187                         return r;
 188         }
 189
 190         return 0;
 191 }
 192
 193 int bus_mount_commit_properties(Unit *u) {
 194         assert(u);
 195
 196         unit_realize_cgroup(u);
 197
 198         return 0;
 199 }